Both new thread creation and context switch had the same mistake in
cache management: the bottom of the stack (the "unused" region between
the lower memory bound and the live stack pointer) needs to be
invalidated before we switch, because otherwise any dirty lines we
might have left over can get flushed out on top of the same thread on
another CPU that is putting live data there.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The Xtensa L1 cache layer has straightforward semantics accessible via
single-instructions that operate on cache lines via physical
addresses. These are very amenable to inlining.
Unfortunately the Xtensa HAL layer requires function calls to do this,
leading to significant code waste at the calling site, an extra frame
on the stack and needless runtime instructions for situations where
the call is over a constant region that could elide the loop. This is
made even worse because the HAL library is not built with
-ffunction-sections, so pulling in even one of these tiny cache
functions has the effect of importing a 1500-byte object file into the
link!
Add our own tiny cache layer to include/arch/xtensa/cache.h and use
that instead.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Back when I started work on this stuff, I had a set of notes on
register windows that slowly evolved into something that looks like
formal documentation. There really isn't any overview-style
documentation of this stuff on the public internet, so it couldn't
hurt to commit it here for posterity.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Instead of passing the crt1 _start function as the entry code for
auxiliary CPUs, use a tiny assembly stub instead which can avoid the
runtime testing needed to skip the work in _start. All the crt1 code
was doing was clearing BSS (which must not happen on a second CPU) and
setting the stack pointer (which is wrong on the second CPU).
This allows us to clean out the SMP code in crt1.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The kernel passes the CPU's interrupt stack expected that it will
start on that, so do it. Pass the initial stack pointer from the SOC
layer in the variable "z_mp_stack_top" and set it in the assembly
startup before calling z_mp_entry().
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The xtensa atomics layer was written with hand-coded assembly that had
to be called as functions. That's needlessly slow, given that the low
level primitives are a two-instruction sequence. Ideally the compiler
should see this as an inline to permit it to better optimize around
the needed barriers.
There was also a bug with the atomic_cas function, which had a loop
internally instead of returning the old value synchronously on a
failed swap. That's benign right now because our existing spin lock
does nothing but retry it in a tight loop anyway, but it's incorrect
per spec and would have caused a contention hang with more elaborate
algorithms (for example a spinlock with backoff semantics).
Remove the old implementation and replace with a much smaller inline C
one based on just two assembly primitives.
This patch also contains a little bit of refactoring to address the
scheme has been split out into a separate header for each, and the
ATOMIC_OPERATIONS_CUSTOM kconfig has been renamed to
ATOMIC_OPERATIONS_ARCH to better capture what it means.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
There was a bunch of dead historical cruft floating around in the
arch/xtensa tree, left over from older code versions. It's time to do
a cleanup pass. This is entirely refactoring and size optimization,
no behavior changes on any in-tree devices should be present.
Among the more notable changes:
+ xtensa_context.h offered an elaborate API to deal with a stack frame
and context layout that we no longer use.
+ xtensa_rtos.h was entirely dead code
+ xtensa_timer.h was a parallel abstraction layer implementing in the
architecture layer what we're already doing in our timer driver.
+ The architecture thread structs (_callee_saved and _thread_arch)
aren't used by current code, and had dead fields that were removed.
Unfortunately for standards compliance and C++ compatibility it's
not possible to leave an empty struct here, so they have a single
byte field.
+ xtensa_api.h was really just some interrupt management inlines used
by irq.h, so fold that code into the outer header.
+ Remove the stale assembly offsets. This architecture doesn't use
that facility.
All told, more than a thousand lines have been removed. Not bad.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
a0 is used as scratch register. Restore value of a0 (return address)
from stack frame before spilling registers on stack
Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>
Only the CAVS 1.5 linker script has full support for the coherence
features, don't advertise it on the other SoC's yet.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
While fixing license headers, identified this script as orphan and not
being used anywhere, so remove.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
XCC doesn't like the "rsr.<reg name>" style assembly
so fix that to the other style.
Also, XCC doesn't like _CONCAT() with the EPC/EPS
registers so need to spell out all of them.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
There is a hard-coded value of PS_INTLEVEL(15) to set the PS
register. The correct way is actually to use XCHAL_EXCM_LEVEL
with PS_INTLEVEL() to setup the register. So fix it.
Fixes#31858
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This change uses stack frame to print backtrace once exception occurs
Printing backtrace helps to identify the cause of exception
Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>
Currently Zephyr links reset-vector.S twice in xtensa builds:
into the bootloader and the main image. It is run at the end
of the boot loader execution and immediately after that again
in the beginning of the main code. This patch adds a
configuration option to select whether to link the file to the
bootloader or to the application. The default is to the
application, as needed e.g. for QEMU, SOF links it to the
bootloader like in native builds.
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
There may be Xtensa SoCs which don't have high enough interrupt
levels for EPC6/EPS6 to exist in _restore_context. So changes
these to those which should be available according to the ISA
config file.
Fixes#30126
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Most of kernel files where declaring os module without providing
log level. Because of that default log level was used instead of
CONFIG_KERNEL_LOG_LEVEL.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Since the tracing of thread being switched in/out has the same
instrumentation points, we can roll the tracing function calls
into the one for thread stats gathering functions.
This avoids duplicating code to call another function.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Adds the necessary bits to initialize TLS in the stack
area and sets up CPU registers during context switch.
Note that this does not enable TLS for all Xtensa SoC.
This is because Xtensa SoCs are highly configurable
so that each SoC can be considered a whole architecture.
So TLS needs to be enabled on the SoC level, instead of
at the arch level.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Implement the kernel "coherence" API on top of the linker
cached/uncached mapping work.
Add Xtensa handling for the stack coherence API.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
It's legal to have CONFIG_MP_NUM_CPUS > 1 and !CONFIG_SMP. The
tests/kernel/mp test does this as a unit test of the multiprocessor
facilities. Test the right tunable when deciding whether to blow away
static data or not.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This code had one purpose only, feed timing information into a test and
was not used by anything else. The custom trace points unfortunatly were
not accurate and this test was delivering informatin that conflicted
with other tests we have due to placement of such trace points in the
architecture and kernel code.
For such measurements we are planning to use the tracing functionality
in a special mode that would be used for metrics without polluting the
architecture and kernel code with additional tracing and timing code.
Furthermore, much of the assembly code used had issues.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Move tracing switched_in and switched_out to the architecture code and
remove duplications. This changes swap tracing for x86, xtensa.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
The core kernel computes the initial stack pointer
for a thread, properly aligning it and subtracting out
any random offsets or thread-local storage areas.
arch_new_thread() no longer needs to make any calculations,
an initial stack frame may be placed at the bounds of
the new 'stack_ptr' parameter passed in. This parameter
replaces 'stack_size'.
thread->stack_info is now set before arch_new_thread()
is invoked, z_new_thread_init() has been removed.
The values populated may need to be adjusted on arches
which carve-out MPU guard space from the actual stack
buffer.
thread->stack_info now has a new member 'delta' which
indicates any offset applied for TLS or random offset.
It's used so the calculations don't need to be repeated
if the thread later drops to user mode.
CONFIG_INIT_STACKS logic is now performed inside
z_setup_new_thread(), before arch_new_thread() is called.
thread->stack_info is now defined as the canonical
user-accessible area within the stack object, including
random offsets and TLS. It will never include any
carved-out memory for MPU guards and must be updated at
runtime if guards are removed.
Available stack space is now optimized. Some arches may
need to significantly round up the buffer size to account
for page-level granularity or MPU power-of-two requirements.
This space is now accounted for and used by virtue of
the Z_THREAD_STACK_SIZE_ADJUST() call in z_setup_new_thread.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
MISRA-C wants the parameter names in a function implementaion
to match the names used by the header prototype.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
arch_new_thread() passes along the thread priority and option
flags, but these are already initialized in thread->base and
can be accessed there if needed.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This operation is formally defined as rounding down a potential
stack pointer value to meet CPU and ABI requirments.
This was previously defined ad-hoc as STACK_ROUND_DOWN().
A new architecture constant ARCH_STACK_PTR_ALIGN is added.
Z_STACK_PTR_ALIGN() is defined in terms of it. This used to
be inconsistently specified as STACK_ALIGN or STACK_PTR_ALIGN;
in the latter case, STACK_ALIGN meant something else, typically
a required alignment for the base of a stack buffer.
STACK_ROUND_UP() only used in practice by Risc-V, delete
elsewhere.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
The core kernel z_setup_new_thread() calls into arch_new_thread(),
which calls back into the core kernel via z_new_thread_init().
Move everything that doesn't have to be in z_new_thread_init() to
z_setup_new_thread() and convert to an inline function.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Under multi-processing, only the first CPU#0 needs to go through
setting up the kernel structs and clearing out BSS (among others).
There is no need for other CPUs to do those tasks. Since each
Xtensa core starts using the same boot vector, CPUs other than #0
need to skip all the startup tasks by not calling to z_cstart().
So provide another entry point for those CPUs. Note that Xtensa
arch is highly configurable. So the implementation of the entry
point is up to each individual SoC config.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Under SMP, the main BSS section only needs to be zero-ed on CPU #0.
Other CPUs should not zero out BSS, or else it may cause CPU #0 to
crash on invalid data.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
The set of interrupt stacks is now expressed as an array. We
also define the idle threads and their associated stacks this
way. This allows for iteration in cases where we have multiple
CPUs.
There is now a centralized declaration in kernel_internal.h.
On uniprocessor systems, z_interrupt_stacks has one element
and can be used in the same way as _interrupt_stack.
The IRQ stack for CPU 0 is now set in init.c instead of in
arch code.
The extern definition of the main thread stack is now removed,
this doesn't need to be in a header.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Xtensa uses two instructions to perform atomic compare-and-set
instruction: first the comparison register, then the actual
instruction to do compare-and-set. There is a potential that
context switching is performed before these two instructions.
A restored context may have the wrong value in the comparison
register. So we need to save and restore the comparison
register during context switching.
Fixes#21800
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This reverts commit 9987c2e2f9
which spills SoC configs into architecture files and is not
exactly desirable. So revert it.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Use BOOTLOADER definition to separate bootloader code. This allows to
use the same file reset-vector.S when building bootloader and when
CONFIG_XTENSA_RESET_VECTOR is enabled.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
The atomic_cas function was using incorrect register when determining
whether value was swapped. The swapping instruction s32c1i in
atomic_cas stores the value at memory location in register a4
regardless of whether swapping is done. In this case, the register a4
should be used to determine whether a swap is done. However, register
a3 (containing the oldValue as function argument) is used instead.
Since register a5 contains the old value at address loaded before
the swapping instruction, a3 and a5 contain the same value.
Since a3 == a5 is always true in this case, the function will always
return 1 even though values are not swapped. So fix it by using
the correct register.
Also, in case the value is not swapped, it jumps to where it returns
zero instead of loading from memory and comparing again.
The function was simply looping until swapping was done, which did not
align with the API where it would return 0 when swapping is not done
(regardless whether the memory location contains the old value or not).
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This adds the necessary bits to build the Xtensa HAL as
a module, and removes the bits to use the HAL built with
the Zephyr SDK.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Promote the private z_arch_* namespace, which specifies
the interface between the core kernel and the
architecture code, to a new top-level namespace named
arch_*.
This allows our documentation generation to create
online documentation for this set of interfaces,
and this set of interfaces is worth treating in a
more formal way anyway.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
When compiling the components under the arch directory, the compiler
include paths for arch and kernel private headers need to be specified.
This was previously done by adding 'zephyr_library_include_directories'
to CMakeLists.txt file for every component under the arch directory,
and this resulted in a significant amount of duplicate code.
This commit uses the CMake 'include_directories' command in the root
CMakeLists.txt to simplify specification of the private header include
paths for all the arch components.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit refactors kernel and arch headers to establish a boundary
between private and public interface headers.
The refactoring strategy used in this commit is detailed in the issue
This commit introduces the following major changes:
1. Establish a clear boundary between private and public headers by
removing "kernel/include" and "arch/*/include" from the global
include paths. Ideally, only kernel/ and arch/*/ source files should
reference the headers in these directories. If these headers must be
used by a component, these include paths shall be manually added to
the CMakeLists.txt file of the component. This is intended to
discourage applications from including private kernel and arch
headers either knowingly and unknowingly.
- kernel/include/ (PRIVATE)
This directory contains the private headers that provide private
kernel definitions which should not be visible outside the kernel
and arch source code. All public kernel definitions must be added
to an appropriate header located under include/.
- arch/*/include/ (PRIVATE)
This directory contains the private headers that provide private
architecture-specific definitions which should not be visible
outside the arch and kernel source code. All public architecture-
specific definitions must be added to an appropriate header located
under include/arch/*/.
- include/ AND include/sys/ (PUBLIC)
This directory contains the public headers that provide public
kernel definitions which can be referenced by both kernel and
application code.
- include/arch/*/ (PUBLIC)
This directory contains the public headers that provide public
architecture-specific definitions which can be referenced by both
kernel and application code.
2. Split arch_interface.h into "kernel-to-arch interface" and "public
arch interface" divisions.
- kernel/include/kernel_arch_interface.h
* provides private "kernel-to-arch interface" definition.
* includes arch/*/include/kernel_arch_func.h to ensure that the
interface function implementations are always available.
* includes sys/arch_interface.h so that public arch interface
definitions are automatically included when including this file.
- arch/*/include/kernel_arch_func.h
* provides architecture-specific "kernel-to-arch interface"
implementation.
* only the functions that will be used in kernel and arch source
files are defined here.
- include/sys/arch_interface.h
* provides "public arch interface" definition.
* includes include/arch/arch_inlines.h to ensure that the
architecture-specific public inline interface function
implementations are always available.
- include/arch/arch_inlines.h
* includes architecture-specific arch_inlines.h in
include/arch/*/arch_inline.h.
- include/arch/*/arch_inline.h
* provides architecture-specific "public arch interface" inline
function implementation.
* supersedes include/sys/arch_inline.h.
3. Refactor kernel and the existing architecture implementations.
- Remove circular dependency of kernel and arch headers. The
following general rules should be observed:
* Never include any private headers from public headers
* Never include kernel_internal.h in kernel_arch_data.h
* Always include kernel_arch_data.h from kernel_arch_func.h
* Never include kernel.h from kernel_struct.h either directly or
indirectly. Only add the kernel structures that must be referenced
from public arch headers in this file.
- Relocate syscall_handler.h to include/ so it can be used in the
public code. This is necessary because many user-mode public codes
reference the functions defined in this header.
- Relocate kernel_arch_thread.h to include/arch/*/thread.h. This is
necessary to provide architecture-specific thread definition for
'struct k_thread' in kernel.h.
- Remove any private header dependencies from public headers using
the following methods:
* If dependency is not required, simply omit
* If dependency is required,
- Relocate a portion of the required dependencies from the
private header to an appropriate public header OR
- Relocate the required private header to make it public.
This commit supersedes #20047, addresses #19666, and fixes#3056.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
Use this short header style in all Kconfig files:
# <description>
# <copyright>
# <license>
...
Also change all <description>s from
# Kconfig[.extension] - Foo-related options
to just
# Foo-related options
It's clear enough that it's about Kconfig.
The <description> cleanup was done with this command, along with some
manual cleanup (big letter at the start, etc.)
git ls-files '*Kconfig*' | \
xargs sed -i -E '1 s/#\s*Kconfig[\w.-]*\s*-\s*/# /'
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Same deal as in commit 7fdb525754 ("kconfig: Use 'default' instead of
'def_bool' in Kconfig.defconfig files"), but I hacked Kconfiglib to also
find cases where the type is given separately as e.g.
config FOO
int
default 3
Motivation (from a note in
https://docs.zephyrproject.org/latest/guides/kconfig/index.html):
For a symbol defined in multiple locations (e.g., in a
Kconfig.defconfig file in Zephyr), it is best to only give the
symbol type for the "base" definition of the symbol, and to use
'default' (instead of 'def_<type>' value) for the remaining
definitions. That way, if the base definition of the symbol is
removed, the symbol ends up without a type, which generates a
warning that points to the other definitions. That makes the extra
definitions easier to discover and remove.
It's also nice if 'def_bool' and the like turn into a semi-reliable flag
that the symbol is only defined in Kconfig.defconfig files. That might
be a sign that things could be cleaned up.
Will do a separate pass later to remove some symbols only defined in
Kconfig.defconfig files.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Unused since commit 6fd6b7e50a ("xtensa: remove legacy arch
implementation").
Found with a script.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Unused since commit 6fd6b7e50a ("xtensa: remove legacy arch
implementation").
Found with a script.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
include/sys/arch_inlines.h will contain all architecture APIs
that are used by public inline functions and macros,
with implementations deriving from include/arch/cpu.h.
kernel/include/arch_interface.h will contain everything
else, with implementations deriving from
arch/*/include/kernel_arch_func.h.
Instances of duplicate documentation for these APIs have been
removed; implementation details have been left in place.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This makes it clearer that this is an API that is expected
to be implemented at the architecture level.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This is part of the core kernel -> architecture interface and
has been renamed z_arch_kernel_init().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
k_cpu_idle() and k_cpu_atomic_idle() were being directly
implemented by arch code.
Rename these implementations to z_arch_cpu_idle() and
z_arch_cpu_atomic_idle(), and call them from new inline
function definitions in kernel.h.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This is part of the core kernel -> architecture interface
and is appropriately renamed z_arch_is_in_isr().
References from test cases changed to k_is_in_isr().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This is part of the core kernel -> architecture interface
and should have a leading prefix z_arch_.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Various C and Assembly modules
make function calls to z_sys_trace_*. These merely call
corresponding functions sys_trace_*. This commit
is to simplify these by making direct function calls
to the sys_trace_* functions from these modules.
Subsequently, the z_sys_trace_* functions are removed.
Signed-off-by: Mrinal Sen <msen@oticon.com>
We re-wrote the xtensa arch code, but never got around
to purging the old implementation.
Removed those boards which hadn't been moved to the new
arch code. These were all xt-sim simulator targets and not
real hardware.
Fixes: #18138
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This adds a simple infinite loop when double exception is raised.
Without this, if double exception occurs, it would execute
arbitrary code.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This follows the z_arch_irq_en-/dis-able() so that the SoC
definitions are responsible for functions related to multi-level
interrupts.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Use the 'not in' operator. Fixes this pylint warning:
arch/xtensa/core/xtensa_intgen.py:77:7: C0113: Consider changing
"not lvl in ints_by_lvl" to "lvl not in ints_by_lvl" (unneeded-not)
Fixing pylint warnings for a CI check.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Update the xtensa backend to work better with the new fatal error
architecture. Move the stack frame dump (xtensa uses a variable-size
frame becuase we don't spill unused register windows, so it doesn't
strictly have an ESF struct) into z_xtensa_fatal_error(). Unify the
older exception logging with the newer one (they'd been sort of glomed
together in the recent rework), mostly using the asm2 code but with
the exception cause stringification and the PS register field
extraction from the older one.
Note that one shortcoming is that the way the dispatch code works, we
don't have access to the spilled frame from within the spurious error
handler, so this can't log the interrupted CPU state. This isn't
fixable easily without adding overhead to every interrupt entry, so it
needs to stay the way it is for now. Longer term we could exract the
caller frame from the window state and figure it out with some
elaborate assembly, I guess.
Fixes#18140
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Consistently place C++ use of extern "C" after all include directives,
within the negative branch of _ASMLANGUAGE if used.
Background from issue #17997:
Declarations that use C linkage should be placed within extern "C"
so the language linkage is correct when the header is included by
a C++ compiler.
Similarly #include directives should be outside the extern "C" to
ensure the language-specific default linkage is applied to any
declarations provided by the included header.
See: https://en.cppreference.com/w/cpp/language/language_linkage
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
When coming out of an exception, we need to mask interrupts
to avoid races when decrementing the nested count. Move
the instruction that does this earlier.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
It looks like, at some point in the past, initializing thread stacks
was the responsibility of the arch layer. After that was centralized,
we forgot to remove the related conditional header inclusion. Fixed.
Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This is now called z_arch_esf_t, conforming to our naming
convention.
This needs to remain a typedef due to how our offset generation
header mechanism works.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
We introduce a new z_fatal_print() API and replace all
occurrences of exception handling code to use it.
This routes messages to the logging subsystem if enabled.
Otherwise, messages are sent to printk().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
* z_NanoFatalErrorHandler() is now moved to common kernel code
and renamed z_fatal_error(). Arches dump arch-specific info
before calling.
* z_SysFatalErrorHandler() is now moved to common kernel code
and renamed k_sys_fatal_error_handler(). It is now much simpler;
the default policy is simply to lock interrupts and halt the system.
If an implementation of this function returns, then the currently
running thread is aborted.
* New arch-specific APIs introduced:
- z_arch_system_halt() simply powers off or halts the system.
* We now have a standard set of fatal exception reason codes,
namespaced under K_ERR_*
* CONFIG_SIMPLE_FATAL_ERROR_HANDLER deleted
* LOG_PANIC() calls moved to k_sys_fatal_error_handler()
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
The SoC initialization code used system clock frequency
as a CPU clock frequency. This commit corrects that by
obtaining the needed value from DTS.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
move misc/util.h to sys/util.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move misc/printk.h to sys/printk.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move misc/dlist.h to sys/dlist.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move misc/__assert.h to sys/__assert.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move tracing.h to debug/tracing.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Found a few annoying typos and figured I better run script and
fix anything it can find, here are the results...
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
The struct _caller_saved is not used. Most architectures put
automatically the registers onto stack, in others architectures the
exception code does it.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
The struct _kernel_ach exists only because ARC' s port needed it, in
all other ports this was defined as an empty struct. Turns out that
this struct is not required even for ARC anymore, this is a legacy
code from nanokernel time.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Update the files which contain no license information with the
'Apache-2.0' SPDX license identifier. Many source files in the tree are
missing licensing information, which makes it harder for compliance
tools to determine the correct license.
By default all files without license information are under the default
license of Zephyr, which is Apache version 2.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This macro is slated for complete removal, as it's not possible
on arches with an MPU stack guard to know the true buffer bounds
without also knowing the runtime state of its associated thread.
As removing this completely would be invasive to where we are
in the 1.14 release, demote to a private kernel Z_ API instead.
The current way that the macro is being used internally will
not cause any undue harm, we just don't want any external code
depending on it.
The final work to remove this (and overhaul stack specification in
general) will take place in 1.15 in the context of #14269Fixes: #14766
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Rename reserved function names in arch/ subdirectory. The Python
script gen_priv_stacks.py was updated to follow the 'z_' prefix
naming.
Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
Rename reserved function names in drivers/ subdirectory. Update
function macros concatenatenating function names with '##'. As
there is a conflict between the existing gpio_sch_manage_callback()
and _gpio_sch_manage_callback() names, leave the latter unmodified.
Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
Discovered with pylint3.
Use the placeholder name '_' for unproblematic unused variables. It's
what I'm used to, and pylint knows not to flag it.
Python tip:
for i in range(n):
some_list.append(0)
can be replaced with
some_list += n*[0]
Similarly, 3*'\t' gives '\t\t\t'.
(Relevant here because pylint flagged the loop index as unused.)
To do integer division in Python 3, use // instead of /.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
BIT macro uses an unsigned int avoiding implementation-defined behavior
when shifting signed types.
MISRA-C rule 10.1
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
BIT macro uses an unsigned int avoiding implementation-defined behavior
when shifting signed types.
MISRA-C rule 10.1
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Update reserved function names starting with one underscore, replacing
them as follows:
'_k_' with 'z_'
'_K_' with 'Z_'
'_handler_' with 'z_handl_'
'_Cstart' with 'z_cstart'
'_Swap' with 'z_swap'
This renaming is done on both global and those static function names
in kernel/include and include/. Other static function names in kernel/
are renamed by removing the leading underscore. Other function names
not starting with any prefix listed above are renamed starting with
a 'z_' or 'Z_' prefix.
Function names starting with two or three leading underscores are not
automatcally renamed since these names will collide with the variants
with two or three leading underscores.
Various generator scripts have also been updated as well as perf,
linker and usb files. These are
drivers/serial/uart_handlers.c
include/linker/kobject-text.ld
kernel/include/syscall_handler.h
scripts/gen_kobject_list.py
scripts/gen_syscall_header.py
Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
This reverts commit c9ace83c89 which
bypasses setting cache attributes.
The previous cache attributes actually set the text/data/etc.
sections to be inaccessible. So fix it.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This partially reverts commit 5a47c60dbf.
The soc.h is now only included when _soc_irq_*() is being referred.
Fixes#11077.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Don't present USE_SWITCH and SMP to user applications that are
configuring for platforms that do not support SMP or USE_SWITCH.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This commit removes the custom_data field from _thread_arch
for xtensa platform as it is currently unused.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
There were many platforms where this function was doing nothing. Just
merging its functionality with _PrepC function.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
The identifier looks like a mixed C/C++ comment, which is against
MISRA-C rule 3.1. As the identifier is not used, remove it altogether.
Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
The old xtensa layer had an unused/untested facility where it would
apparently try to slave a timer tick to an arbitrary interrupt. The
legacy headers were still checking the kconfigs used to enable that
even though nothing wants it and the new driver has removed them,
breaking builds on platforms like S1000 that still use the older
layer.
Don't try to finess this as these files are going away. Just make
them local preprocessor symbols and set them to the default values
they always had.
(Note: the feature doesn't sound like it would have been so bad,
actually. We should probably crib that idea of having an
"external_tick" driver, but there's no reason for it to have been
arch-specific.)
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Xtensa interrupts are handled generically, by testing a set of flagged
interrupts in the INTERRUPT register. It's not possible to know
exactly which device "caused" an interrupt.
The entry code was dispatching correctly, but it was failing to test
the enable state in INTENABLE. Such an interrupt will never "fire",
but it might still be flagged, and if we happen to end up handling an
interrupt of the same priority (due to some other device) the entry
handler would incorrectly invoke the disabled interrupt.
Found by dumb luck and a comedy of errors: the recent timer driver
change swapped the counter in use, which changed the interrupt number
to one shared with the I2C driver, whose early interrupts (odd that
this device is interrupting on boot when not in use, but whatever)
would then discover the OTHER timer counter had been flagged and try
to invoke an ISR for that other counter, which was the _irq_spurious()
spurious interrupt handler.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Zephyr isn't ready to handle interrupts yet, until the
threading/scheduler are set up and we make our first context switch.
This was a semi-hidden bug: only the timer interrupt would actually
get unmasked before the system was ready, and obviously would never
have time to fire a tick before the system completed initialization.
But a combination of system load and a new version of Qemu (which
seems to be more sensitive to non-deterministic timing glitchery) has
made this visible. About 2-3% of the time when run under a full
sanitycheck, the qemu process will get swapped away for long enough
that the tick timer expires before _Cstart() has reached
enable_multithreading().
It looks like the original code was cut and pasted from another
implementation, which was expected to call into an "application"
main() routine that wanted interrupts ready.
Fixes#11182
(Note also that this code is not used for ESP-32, which has its own
startup path)
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This was causing a `label handle_irq defined but not used` warning
during build.
Fixes#10801.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This patch reduces the size of ISRs by changing the script to generate
the dispatcher per level to, instead of generating an indirect call per
mask match, do that just once at the function end.
For ESP32, this provides ~380bytes of savings in a (very) hot path
(text, just for the matcher functions generated by xtensa_intgen.py,
drop from 2197 bytes to 1817 bytes).
The generated code also uses the BIT() macro, which shifts 1UL instead
of 1. Shifting a signed integer is UB in C.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This allows Kconfig to specify which special register is being
used to store the pointer to the _kernel.cpu struct.
Since the SoC itself is highly configurable, sometimes MISC0 is not
available. So this adds the ability to use other special registers.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Always compare unsigned interger type with another unsigned
integer type. Currently in nios2, posix, riscv32, x86 and xtensa
we were comparing the _kernel.nested variable with a signed
interger type. Fixed this violation.
Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
MISRA-C requires that all declarations of a specific function, or
object, use the same names and type qualifiers.
MISRA-C rule 8.3
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Added LOG_PANIC to fault handlers to ensure that log is flush and
logger processes messages in a blocking way in fault handler.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Any word started with underscore followed by and uppercase letter or a
second underscore is a reserved word according with C99.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
The return of memset is never checked. This patch explicitly ignore
the return to avoid MISRA-C violations.
The only directory excluded directory was ext/* since it contains
only imported code.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Rather than do that for each architecture, source SoC Kconfigs where the
code is maintained, under ZEPHYR_BASE/soc.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Move the SoC outside of the architecture tree and put them at the same
level as boards and architectures allowing both SoCs and boards to be
maintained outside the tree.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Remove extra #endif that should have been removed when the
corresponding #ifdef CONFIG_KERNEL_EVENT_LOGGER_SLEEP was
removed in commit a2248782a2
Signed-off-by: Sathish Kuttan <sathish.k.kuttan@intel.com>
Move to more generic tracing hooks that can be implemented in different
ways and do not interfere with the kernel.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This patch provides support needed to get timing related
information from xtensa based SOC.
Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
Added a SYS_INIT for SoC level initialization of Intel S1000
Added routines for setting up resource ownership for
DMA, I2S
Added routine to setup power gating and clock configuration
Signed-off-by: Sathish Kuttan <sathish.k.kuttan@intel.com>
A design flaw of 'gsource' is that there's no way to require at least
one file to match the glob pattern. This could lead to silent errors.
Switch to a new design, where a plain 'source' is globbing and requires
at least one file to match. A separate 'osource' (optional source)
statement is available for cases where it's okay for a pattern (or plain
filename) to not match any files.
'orsource' combines 'osource' and 'rsource' (relative source).
This commit search-replaces 'gsource' with 'source', but backwards
compatibility with 'gsource' is still maintained by making it an alias
for 'osource' (and by making 'grsource' an alias for 'orsource').
The three Kconfig files arch/{nios2,posix,xtensa}/Kconfig source
arch/{nios2,posix,xtensa}/soc/*/Kconfig, which doesn't match any files.
Use 'osource' for those. The soc/*/Kconfig files seem to be for
additional SoC-specific symbols, only none exist yet on those ARCHes.
Also use 'osource' for the source of $ENV_VAR_BOARD_DIR/Kconfig in
boards/Kconfig, which doesn't exist for all boards.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Up until now, Zephyr has patched Kconfig to use the last 'default' with
a satisfied condition, instead of the first one. I'm not sure why the
patch was added (it predates Kconfiglib), but I suspect it's related to
Kconfig.defconfig files.
There are at least three problems with the patch:
1. It's inconsistent with how Kconfig works in other projects, which
might confuse newcomers.
2. Due to oversights, earlier 'range' properties are still preferred,
as well as earlier 'default' properties on choices.
In addition to being inconsistent, this makes it impossible to
override 'range' properties and choice 'default' properties if the
base definition of the symbol/choice already has 'range'/'default'
properties.
I've seen errors caused by the inconsistency, and I suspect there
are more.
3. A fork of Kconfiglib that adds the patch needs to be maintained.
Get rid of the patch and go back to standard Kconfig behavior, as
follows:
1. Include the Kconfig.defconfig files first instead of last in
Kconfig.zephyr.
2. Include boards/Kconfig and arch/<arch>/Kconfig first instead of
last in arch/Kconfig.
3. Include arch/<arch>/soc/*/Kconfig first instead of last in
arch/<arch>/Kconfig.
4. Swap a few other 'source's to preserve behavior for some scattered
symbols with multiple definitions.
Swap 'source's in some no-op cases too, where it might match the
intent.
5. Reverse the defaults on symbol definitions that have more than one
default.
Skip defaults that are mutually exclusive, e.g. where each default
has an 'if <some board>' condition. They are already safe.
6. Remove the prefer-later-defaults patch from Kconfiglib.
Testing was done with a Python script that lists all Kconfig
symbols/choices with multiple defaults, along with a whitelist of fixed
symbols. The script also verifies that there are no "unreachable"
defaults hidden by defaults without conditions
As an additional test, zephyr/.config was generated before and after the
change for several samples and checked to be identical (after sorting).
This commit includes some default-related cleanups as well:
- Simplify some symbol definitions, e.g. where a default has 'if FOO'
when the symbol already has 'depends on FOO'.
- Remove some redundant 'default ""' for string symbols. This is the
implicit default.
Piggyback fixes for swapped ranges on BT_L2CAP_RX_MTU and
BT_L2CAP_TX_MTU (caused by confusing inconsistency).
Piggyback some fixes for style nits too, e.g. unindented help texts.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
This fixes a build issue on esp32 that was introduced recently with the
merge of an old PR.
Include the register headers in soc.h rather than soc.c and make them
available to other code via soc.h
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
On 'drivers/i2c_esp32.c' there are functions useful for other
drivers. Functions and struct went moved to:
* arch/xtensa/soc/esp32/peripheral.h
* arch/xtensa/soc/esp32/soc.h
* include/drivers/gpio/gpio_esp32.h
Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
The entry point can and therefore should be set by linker
scripts. Whenever possible one should express things in the source
language, be it .c or .ld, and not in code generators or in the build
system.
This patch removes the flag -eCONFIG_KERNEL_ENTRY from the linker's
command line and replaces it with the linker script command
ENTRY(CONFIG_KERNEL_ENTRY)
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
Bool symbols implicitly default to 'n'.
A 'default n' can make sense e.g. in a Kconfig.defconfig file, if you
want to override a 'default y' on the base definition of the symbol. It
isn't used like that on any of these symbols though.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Both variables were used (with the same value) interchangeably
throughout CMake files and per the discussion in GH issue,
ZEPHYR_BASE is preferred.
Also add a comment with explanation of one vs. the other.
Tested by building hello_world for several boards ensuring no errors.
Fixes#7173.
Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
lib/libc/minimal/source/CMakeLists.txt and
lib/libc/minimal/source/stdout/CMakeLists.txt was introduced in
12f8f7616 but it is not used by the build system. CMakeLists.txt in
the parent dir lib/libc/minimal/CMakeLists.txt adds C files to the
target with the lines like:
${CMAKE_CURRENT_SOURCE_DIR}/source/stdlib/atoi.c
${CMAKE_CURRENT_SOURCE_DIR}/source/stdlib/strtol.c
To make other empty CMakeLists.txt explicit, this commit adds a
comment line to them.
Signed-off-by: Yasushi SHOJI <y-shoji@ispace-inc.com>
IRQ priorities for CAVS and DW were previously defined in Kconfig.
They are now defined via DTS and removed from Kconfig.
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
The original implementation of CONFIG_THREAD_MONITOR would
try to leverage a thread's initial stack layout to provide
the entry function with arguments for any given thread.
This is problematic:
- Some arches do not have a initial stack layout suitable for
this
- Some arches never enabled this at all (riscv32, nios2)
- Some arches did not enable this properly
- Dropping to user mode would erase or provide incorrect
information.
Just spend a few extra bytes to store this stuff directly
in the k_thread struct and get rid of all the arch-specific
code for this.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Add bit definitions and set M/N divider ownership in
i2s_initialize.
Changes to comply with coding guidelines
Changes to address review comments
Signed-off-by: Sathish Kuttan <sathish.k.kuttan@intel.com>
Added a function to obtain the reference clock frequency value based on
SoC's bootstraps.
Added M/N divider base address in SoC header file
Signed-off-by: Sathish Kuttan <sathish.k.kuttan@intel.com>
At least one of my WROOM boards has trouble getting the APPCPU
started, that was magically getting better when I started adding
printk's to debug. It turns out that UART output (and NOT simply idle
cycles of delay) was the magic dust to fix things. As this SMP
implementation is reverse engineered voodoo to begin with, this hack
should be acceptable in the medium term.
See in-file comments on smp_log() for details.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
In preparation for introducing a warning.
Unquoted string defaults work through a quirk of Kconfig (undefined
symbols get their name as their string value), but look confusing. It's
done inconsistently now too.
Suggested by Kumar Gala.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
The metairq feature exposed the fact that all of our arch code (and a
few mistaken spots in the scheduler too) was trying to interpret
"preemptible" threads independently.
As of the scheduler rewrite, that logic is entirely within sched.c and
doing it externally is redundant. And now that "cooperative" threads
can be preempted, it's wrong and produces test failures when used with
metairq threads.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The Kconfig option TOOLCHAIN_VARIANT (not to be confused with
ZEPHYR_TOOLCHAIN_VARIANT) is a legacy configuration option that has
very few use-cases and can easily be dropped.
It's functionality is easily covered by CONFIG_X86_IAMCU and
ZEPHYR_TOOLCHAIN_VARIANT.
This commit removes all references of it from Zephyr.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
patch add clock frequency and interrupt property to uart
node in intel_s1000.dtsi. Include soc.h after types.h to
prevent build error.
Signed-off-by: Savinay Dharmappa <savinay.dharmappa@intel.com>
Fix the ns16550 uart driver and relevant SoCs accordingly.
All generic settings are now DTS based.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
The interrupt stack area wasn't being set to a repeating
0xAA pattern at boot as it should be. This is now done in
kernel_arch_init(), which runs before interrupts are
enabled for the first time.
Fixes#7327
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Until now, Zephyr has used a patched Kconfiglib that turns 'source' into
a globbing source (by replacing 'source' with 'gsource' at the token
level). There's two problems with this:
- The patch needs to be maintained separately
- Misspelled filenames are silently ignored, as they look like glob
patterns that don't match anything
Fix it as follows:
1. Replace all 'source' statements that use wildcards with 'gsource'
2. Remove the custom Kconfiglib patch so that 'source' no longer globs
The sed pattern '/source.*[*?]/s/source/gsource/' was run over all
Kconfig* files to do the replacement.
source's that use environment variables that might contain glob patterns
were manually changed to gsource.
Building the docs in doc/ is a good test, as doc/Makefile deliberately
sets the environment variables to glob up as many Kconfig files as
possible.
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Implements the driver for Intel CAVS I2S. Only Playback
is currently supported.
Change-Id: I7b816f9736dc35e79a81d3664d6405dc0aac15b4
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Enable the CAVS DMA on intel_s1000. Also, introduce a test to
validate the DMA.
Change-Id: I2ff233c45cfd8aea55e254d905350a666aa649a0
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Introduce the Intel CAVS DMA. This is based out of the DesignWare
DMA IP but the register offset and bits have been changed in some
cases. However, the fundamental definition for the register field
has not been changed. Hence the registers begin with "DW_" to
indicate the Designware origin.
This driver currently supports the single block mode and linked list
multi-block mode. Scatter-Gather is not supported.
Change-Id: I33a8ed5141d9236167de50e14d3d407e95d6f553
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
intel_s1000 has multiple levels of interrupts consisting of core, CAVS
Logic and designware interrupt controller. This patchset modifies
the regular gen_isr mechanism to support these multiple levels.
Change-Id: I0450666d4e601dfbc8cadc9c9d8100afb61a214c
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
intel_s1000 makes use of DesignWare IP for I2C.
Change-Id: Ie091318c5959b95e1febeb5cefa440f35a6d144b
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Enable GPIO handling for intel_s1000. It uses a DesignWare IP.
Change-Id: I522534935e4ef3a56d93aca669f6de961d927481
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
__start is deemed the entry point for all architectures in Zephyr.
Accordingly, Xtensa code had to be modified a bit to fall in line
with this convention.
Change-Id: If3ed344721c9f2735378b866662a68d8d5795324
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
intel_s1000 uses DesignWare IP for UART. National Semiconductor
16550 (UART) component specification is followed in this IP.
Change-Id: Ied7df1dc178d55b6dbe71d729d6383ba07274ea4
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Setting CACHEATTR from _memmap_cacheattr_reset is making
the intel_s1000 SoC get into some unknown state. Removing
it for intel_s1000_crb for now.
Change-Id: Ib44638ef75de6200ef5c2aad55f093a633da864a
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
intel_s1000_crb board makes use of the intel_s1000 SoC. It has
a built-in ROM which gets executed upon applying power. It then
executes the secondary bootloader followed by the FW (like zephyr).
Change-Id: If334c359b4372a56997c3b2e1eb9250e80847f07
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Define memctl_default.S and memerror-vector.S files. A reference
could be found in the Xtensa toolchain directories. These are
required for using cavs21_LX6HiFi3_RF3_WB16 Xtensa CPU mainly in
simulator. On boards which have ROM, these would have been already
defined in the ROM. Hence, the contents of these files will be
developed at a later time if required.
Change-Id: Idf52397bb6880c136525e69f47e09defcba7f036
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
intel_s1000 is an SoC having cavs21_LX6HiFi3_RF3_WB16 as the CPU which
belongs to Xtensa family. This is being used in intel_s1000_crb.
Change-Id: Ic424aa77557bf31024ddbf3f1d76b72a4adb8f66
Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
The xtensa asm2 layer had a function to select the next switch handle
to return into following an exception. There is no arch-specific code
there, it's just scheduler logic. Move it to the scheduler where it
belongs.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This was a little embarassing. The swap code got this right, and the
interrupt exit path got it right, but on entry we weren't ever saving
the shift and loop registers for the interrupted context.
This almost always worked anyway as the loop registers aren't ever
used in any Zephyr code (gcc won't generate this style of loop AFAICT)
and the SAR shift amount register is generally used only in two pairs
of adjacent instructions making the chance of hitting that exact cycle
quite low in general.
But of course we have shift-happy crypto code in our tests, so this
got caught, thankfully.
See https://github.com/zephyrproject-rtos/zephyr/issues/6470
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
ESP-IDF commit cb31222e added the dependency on a file named
"sdkconfig.h", which is equivalent to "autoconf.h" generated by kbuild
used in Zephyr. It does not depend on anything from that file, though,
so just provide an empty file to keep the compiler from complaining.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
When returning into a different thread than we interrupted, we
obviously need to spill all the existing register windows to make sure
all their values are in the old thread's stack. But the code to do
this forgot to reset the current stack pointer to the value it had at
interrupt time (it was still pointing to the saved context below
that), so the caller of the interrupted function was spilling to the
wrong spot.
This wouldn't show up as an instant failure, it would only happen when
switching BACK to the improperly-spilled thread. And even then it
would be a noop if the original interrupt handler was deep enough to
have spilled that function naturally.
In practice, this happened only in some instances on ESP-32 (which has
more windowed registers than qemu) when interrupting the idle thread
(which is very shallow) with a (very simple) timer interrupt. Trivial
to see, hard to find.
See https://github.com/zephyrproject-rtos/zephyr/issues/6346 for more
detail.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Include `soc.h` first, which will include the ESP-IDF headers -- which
will define the `BIT()` macro without checking if they're already
defined, like the Zephyr headers do.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
The xtensa headers use this for simplicity when SMP is not enabled.
It should still build on older platforms that don't include the
asm2-style CPU pointer scheme.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Non-asm2 devices without a generated SoC interrupt file will see a
compile failure due to the missing header.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
It's not impossible that something we just handled (e.g. a machine
exception) called k_thread_abort() on our current thread. Don't try
to return into it, check the DEAD state.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
In asm2, the machine exception handler runs in interrupt context (this
is good: it allows us to defer the test against exception type until
after we have done the stack switch and dispatched any true
interrupts), but that means that the user error handler needs to be
invoked and then return through the interrupt exit code.
So the __attribute__(__noreturn__) that it was being decorated with
was incorrect. And actually fatal, as with gcc xtensa will crash
trying to return from a noreturn call.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
When in SMP mode, the nested/irq_stack/current fields are specific to
the current CPU and not to the kernel as a whole, so we need an array
of these. Place them in a _cpu_t struct and implement a
_arch_curr_cpu() function to retrieve the pointer.
When not in SMP mode, the first CPU's fields are defined as a unioned
with the first _cpu_t record. This permits compatibility with legacy
assembly on other platforms. Long term, all users, including
uniprocessor architectures, should be updated to use the new scheme.
Fundamentally this is just renaming: the structure layout and runtime
code do not change on any existing platforms and won't until someone
defines a second CPU.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The xtensa-asm2 work included a patch that added nano_internal.h
includes in lots of places that needed to have _Swap defined, because
it had to break a cycle and this no longer got pulled in from the arch
headers.
Unfortunately those new includes created new and more amusing cycles
elsewhere which led to breakage on other platforms.
Break out the _Swap definition (only) into a separate header and use
that instead. Cleaner. Seems not to have any more hidden gotchas.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Simply define the Kconfig variables in this patch so they can be used
in later patches. Define MP_NUM_CPUS correctly on esp32. No code
changes.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This is a mostly-internal API to start a secondary system CPU, with an
implementation for the ESP-32 "APP" cpu. Exposed in kernel.h because
it's plausibly useful for asymmetric MP code managed by an app.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Xtensa register windows have a special exception that happens when the
stack pointer needs to be moved, but the caller function has already
spilled its registers below it.
I thought these were unexercised in Zephyr code, but they turn out to
be thrown by the existing mem_pool tests when run in the 32-register
qemu environment (but not on 64-register hardwre). Because the effect
of the exception is to unspill the caller, there is no good way to
handle this in a traditional handler. Instead put a 5-instruction
stub in front of the user exception handler (i.e. incurring that cost
on every trap and every L1 interrupt) to test before doing the normal
entry.
Works, but would be nicer to optimize this in the future so that only
true alloca exceptions take that cost.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This macro was already available add an external symbol so C code can
access it (via CALL0 -- it's not and can't be an actual function).
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The API allows any byte count for stack size, and tests in fact check
that a stack with a 499 byte stack works correctly. No choice, have
to do this at runtime.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
You'd this feature would be portable, but it's arch-specific.
Initialize the CONFIG_THREAD_MONITOR stuff, placing the __thread_entry
struct (which AFAICT is dead: nothing in the tree actually reads it)
at the top of the stack.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The stack initilaization was calling the user-provided entry function
directly, which works fine until that function returns, at which point
it will try to unspill A0-A3 from the 16 bytes above the allocated
stack and then "return" to a NULL pointer.
The kernel provides a _thread_entry() function that does cleanup
properly, so use that.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
When using _arch_switch() context switching, the thread return value
is a generic hook and not provided by the architecture.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This adds vectors for all interrupt levels defined by core-isa.h.
Modify the entry code a little bit to select correct linker sections
(levels 1, 6 and 7 get special names for... no particularly good
reason) and to constructed the interrupted PS value correctly (no EPS1
register for exceptions since they had to have interrupted level 0
code and thus differ only in the EXCM bit).
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This python script reads the core-isa.h interrupt definitions (via
running a template file through the toolchain preprocessor to generate
an input file) and emits a fully populated, optimized C handling code
that binary searches only the declared interrupts at a given level and
correctly detects spurious interrupts (and/or incorrect core-isa.h
definitions).
The generated code, alas, turns out not to be any faster than simply
searching the interrupt mask with CLZ (er, NSAU in xtensese), though
it could be faster in theory if the compiler made different choices,
see comments. But I like this for the robustness of the fully
populated search trees and the checking of level vs. mask.
This simply commits the script output into the source tree, including
some checking code to force a build error if the toolchain changes the
headers incompatibly. It would be better long term to have these
headers be generated at build time, but that requires more cmake fu
than I have.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The asm2 layer will build alongside the traditional assembly, but the
reverse is not true. Add a CONFIG_XTENSA_ASM2 to force its use at
runtime and disable the older code.
Note that the older assembly had an initialization function that is
properly part of the timer driver. Move a C equivalent into the timer
driver itself for now to prevent a build breakage. Long term we need
to clean that driver up in a bunch of other ways.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Legacy xtensa had a rather complicated implementation of en/disabling
interrupts, owing to the "software priority" feature (which plays
games with INTENABLE and INTLEVEL to allow for interrupts to interrupt
each other outside their normal priorities). But that's not a Zephyr
feature, it's enabled by a XT_USE_SWPRI value that comes from platform
headers and isn't enabled on any of our boards. Dead code, basically.
Replace with the obvious implementation when asm2 is in use.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This was a dead API. Nothing ever used it, it wasn't exposed in any
API headers. It never appeared in documentation. It's not
particularly clear why a Zephy app would want to hook
architecture-specific exceptions instead of simply using the portable
error framework anyway. And it's not supported by asm2. Delete.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The existing __swap() mechanism is too high level for some
applications because of its scheduler-awareness. This introduces a
new _arch_switch() mechanism, which is a simpler primitive that looks
like:
void _arch_switch(void *handle, void **old_handle_out);
The new thread handle (typically just a stack pointer) is specified
explicitly instead of being picked up from the scheduler by
per-architecture code, and on return the "old" thread handle that got
switched out is returned through the pointer.
The new primitive (currently available only on xtensa) is selected
when CONFIG_USE_SWITCH is "y". A new C _Swap() implementation based
on this primitive is then added which operates compatibly.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
_Swap() is defined in nano_internal.h. Everything calls _Swap().
Pretty much nothing that called _Swap() included nano_internal.h,
expecting it to be picked up automatically through other headers (as
it happened, from the kernel arch-specific include file). A new
_Swap() is going to need some other symbols in the inline definition,
so I needed to break that cycle. Now nothing sees _Swap() defined
anymore. Put nano_internal.h everywhere it's needed.
Our kernel includes remain a big awful yucky mess. This makes things
more correct but no less ugly. Needs cleanup.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
SMP needs a new context switch primitive (to disentangle _swap() from
the scheduler) and new interrupt entry behavior (to be able to take a
global spinlock on behalf of legacy drivers). The existing code is
very obtuse, and working with it led me down a long path of "this
would be so much better if..." So this is a new context and entry
framework, intended to replace the code that exists now, at least on
SMP platforms.
New features:
* The new context switch primitive is xtensa_switch(), which takes a
"new" context handle as an argument instead of getting it from the
scheduler, returns an "old" context handle through a pointer
(e.g. to save it to the old thread context), and restores the lock
state(PS register) exactly as it is at entry instead of taking it as
an argument.
* The register spill code understands wrap-around register windows and
can avoid spilling A4-A15 registers when they are unused by the
interrupted function, saving as much as 48 bytes of stack space on
the interrupted stacks.
* The "spill register windows" routine is entirely different, using a
different mechanism, and is MUCH FASTER (to the tune of almost 200
cycles). See notes in comments.
* Even better, interrupt entry can be done via a clever "cross stack
call" I worked up, meaning that the interrupted thread's registers
do not need to be spilled at all until they are naturally pushed out
by the interrupt handler or until we return from the interrupt into
a different thread. This is a big efficiency win for tiny
interrupts (e.g. timers), and a big latency win for all interrupts.
* Interrupt entry is 100% symmetric with respect to medium/high
interrupts, avoiding the problems seen with hooking high priority
interrupts with the current code (e.g. ESP-32's watchdog driver).
* Much smaller code size. No cut and paste assembly. No use of HAL
calls.
* Assumes "XEA2" interrupt architecture, the register window extension
(i.e. no CALL0 ABI), and the "high priority interrupts" extension.
Does not support the legacy processor variants for which we have no
targets. The old code has some stuff in there to support this, but
it seems bitrotten, untestable, and I'm all but certain it doesn't
work.
Note that this simply adds the primitives to the existing tree in a
form where they can be unit tested. It does not replace the existing
interrupt/exception handling or _Swap() implementation.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Xtensa has a "high priority" class of interrupt levels which ignore
the EXCM bit and can thus interrupt running exception handlers. These
can't be used for C handlers in the general case[1] because C code
needs to be able to throw window over/underflow exceptions, which are
not reentrant.
But the high priority interrupts might be useful to a carefully
designed application, or to unit tests of low level architecture code.
So make their generation optional with this kconfig option.
[1] ESP-32 has a high priority interrupt for its watchdog, apparently.
Which is sort of OK given that it never needs to return to the
interrupted code.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This feature is X86 only and is not used or being tested. It is legacy
feature and no one can prove it actually works. Remove it until we have
proper documentation and samples and multi architecture support.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Rename the nano_internal.h to kernel_internal.h and modify the
header file name accordingly wherever it is used.
Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Introducing CMake is an important step in a larger effort to make
Zephyr easy to use for application developers working on different
platforms with different development environment needs.
Simplified, this change retains Kconfig as-is, and replaces all
Makefiles with CMakeLists.txt. The DSL-like Make language that KBuild
offers is replaced by a set of CMake extentions. These extentions have
either provided simple one-to-one translations of KBuild features or
introduced new concepts that replace KBuild concepts.
This is a breaking change for existing test infrastructure and build
scripts that are maintained out-of-tree. But for FW itself, no porting
should be necessary.
For users that just want to continue their work with minimal
disruption the following should suffice:
Install CMake 3.8.2+
Port any out-of-tree Makefiles to CMake.
Learn the absolute minimum about the new command line interface:
$ cd samples/hello_world
$ mkdir build && cd build
$ cmake -DBOARD=nrf52_pca10040 ..
$ cd build
$ make
PR: zephyrproject-rtos#4692
docs: http://docs.zephyrproject.org/getting_started/getting_started.html
Signed-off-by: Sebastian Boe <sebastian.boe@nordicsemi.no>
Currently this is defined as a k_thread_stack_t pointer.
However this isn't correct, stacks are defined as arrays. Extern
references to k_thread_stack_t doesn't work properly as the compiler
treats it as a pointer to the stack array and not the array itself.
Declaring as an unsized array of k_thread_stack_t doesn't work
well either. The least amount of confusion is to leave out the
pointer/array status completely, use pointers for function prototypes,
and define K_THREAD_STACK_EXTERN() to properly create an extern
reference.
The definitions for all functions and struct that use
k_thread_stack_t need to be updated, but code that uses them should
be unchanged.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Also provide their prototypes in `soc.h`. This should help
readability, since some ROM functions, with their names as provided by
Espressif, have sometimes the same prefix as Zephyr APIs.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Move all QEMU related defines to the boards and cleanup xtensa platforms
which were marked to be QEMU capable by mistake.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
In various places, a private _thread_entry_t, or the full prototype
were being used. Be consistent and use the same typedef everywhere.
Signen-off-by: Andrew Boie <andrew.p.boie@intel.com>
Previously, this was only done if an essential thread self-exited,
and was a runtime check that generated a kernel panic.
Now if any thread has k_thread_abort() called on it, and that thread
is essential to the system operation, this check is made. It is now
an assertion.
_NANO_ERR_INVALID_TASK_EXIT checks and printouts removed since this
is now an assertion.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
For some reason, the ESP32 HAL defines XCHAL_EXCM_LEVEL to 3. This
enables a version of _Level4Vector that doesn't work on this hardware.
Without complete visibility if the version that should work be axed,
keep both in the tree, but build the working other version instead
if building for ESP32.
Jira: ZEP-2556
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Esp-idf defines the BIT macro that is also defined in Zephyr's
misc/util.h. Fix the issue by including the esp-idf headers first, so
that a check in util.h won't redefine the macro if it's already
defined.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
- .text, .text.*, .literal, .literal.* had no matching input section
rule and were being passed to the output binary verbatim. These
are all now in the output "text" section as intended.
- various rules in the data section were unnecessarily using KEEP().
- SW_ISR_TABLE wasn't included in linker script anywhere and was
ending up in its own section, and not the data section as intended.
- noinit section didn't exist at all, now defined.
Issue: ZEP-2508
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This cleans up the exception handling by removing the table declaration
from xtensa_intr_asm.S, and removing the unused
_xt_set_exception_handler() function.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
The Xtensa port was the only one remaining to be converted to the new
way of connecting interrupts in Zephyr. Some things are still
unconverted, mainly the exception table, and this will be performed
another time.
Of note: _irq_priority_set() isn't called on _ARCH_IRQ_CONNECT(), since
IRQs can't change priority on Xtensa: while the architecture has the
concept of interrupt priority levels, each line has a fixed level and
can't be changed.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Dynamic IRQ allocation has been yanked from Zephyr a few releases ago,
so there's no point in keeping these options available.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This provides basic GPIO support, with interrupts, and the ability to
read and write to ports on a pin-by-pin basis.
Jira: ZEP-2286
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Historically, stacks were just character buffers and could be treated
as such if the user wanted to look inside the stack data, and also
declared as an array of the desired stack size.
This is no longer the case. Certain architectures will create a memory
region much larger to account for MPU/MMU guard pages. Unfortunately,
the kernel interfaces treat both the declared stack, and the valid
stack buffer within it as the same char * data type, even though these
absolutely cannot be used interchangeably.
We introduce an opaque k_thread_stack_t which gets instantiated by
K_THREAD_STACK_DECLARE(), this is no longer treated by the compiler
as a character pointer, even though it really is.
To access the real stack buffer within, the result of
K_THREAD_STACK_BUFFER() can be used, which will return a char * type.
This should catch a bunch of programming mistakes at build time:
- Declaring a character array outside of K_THREAD_STACK_DECLARE() and
passing it to K_THREAD_CREATE
- Directly examining the stack created by K_THREAD_STACK_DECLARE()
which is not actually the memory desired and may trigger a CPU
exception
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This needs to be in <arch/cpu.h> so that it can be called
from the k_panic()/k_oops() macros in kernel.h.
Fixes build errors on these arches when using k_panic() or
k_oops().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
The first stage bootloader, part of the ESP32 ROM, already sets up
a stack that's sufficient to execute C programs. So, instead of
implementing __stack() in assembly, do it in C to simplify things
slightly.
This ESP32-specific initialization will perform the following:
- Disable the watchdog timer that's enabled by the bootloader
- Move exception handlers to IRAM
- Disable normal interrupts
- Disable the second CPU
- Zero out the BSS segment
Things that might be performed in the future include setting up the
CPU frequency, memory protection regions, and enabling the flash
cache.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Unconditionally use CONFIG_SIMULATOR_XTENSA to determine if XT_SIMULATOR
or XT_BOARD should be defined.
If CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC, also define XT_CLOCK_FREQ. This
isn't ideal as the clock frequency might be changed in runtime and this
effectively makes it a constant.
Until we can control the clock frequency in runtime, this will suffice.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This is a minimal driver enabling console output during the port
bringup. While the driver works, only one of the three UART devices
are supported, and there isn't any way to change any parameters or
use interrupts. This will most likely be superceded by a proper
driver after the port has matured.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Due to the configurable nature of the Xtensa platform, the generic name of
"LX6" cannot be used to describe an SoC as far as Zephyr goes. So ESP32 is
defined both as a SoC and as a board.
This is based on work by Rajavardhan Gundi.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Stack sentinel doesn't prevent corruption, it just notices when
it happens. Any memory could be in a bad state and it's more
appropriate to take the entire system down rather than just kill
the thread.
Fatal testcase will still work since it installs its own
_SysFatalErrorHandler.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
One of the stack sentinel policies was to check the sentinel
any time a cooperative context switch is done (i.e, _Swap is
called).
This was done by adding a hook to _check_stack_sentinel in
every arch's __swap function.
This way is cleaner as we just have the hook in one inline
function rather than implemented in several different assembly
dialects.
The check upon interrupt is now made unconditionally rather
than checking if we are calling __swap, since the check now
is only called on cooperative _Swap(). The interrupt is always
serviced first.
Issue: ZEP-2244
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Use TOOLCHAIN_VARIANT to indicate what XCC toolchain release
to use.
Set a reasonable default for the RG-2016.4 toolchain release.
D_108mini, D_212GP, D_233L are only in RF-2016.4, set that
appropriately.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
XCC doesn't recognize the "I" compiler constraint but GCC does. Switch
to "i" which is understood by both.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This places a sentinel value at the lowest 4 bytes of a stack
memory region and checks it at various intervals, including when
servicing interrupts or context switching.
This is implemented on all arches except ARC, which supports stack
bounds checking directly in hardware.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
We had two assembly files to prepare for entry into C domain,
one intended for the simulator and one intended for real boards.
- Both files merged into a single crt1.S for either simulated or real
targets
- Extra logic to populate command line arguments from simulator removed,
we don't use it.
- BSS zeroing logic from crt1-boards.S used
- Reference to missing reset-unneeded.S removed
- exit() implementation moved to fatal.c, now invokes a kernel panic
if we are not running under the simulator
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Unline k_thread_spawn(), the struct k_thread can live anywhere and not
in the thread's stack region. This will be useful for memory protection
scenarios where private kernel structures for a thread are not
accessible by that thread, or we want to allow the thread to use all the
stack space we gave it.
This requires a change to the internal _new_thread() API as we need to
provide a separate pointer for the k_thread.
By default, we still create internal threads with the k_thread in stack
memory. Forthcoming patches will change this, but we first need to make
it easier to define k_thread memory of variable size depending on
whether we need to store coprocessor state or not.
Change-Id: I533bbcf317833ba67a771b356b6bbc6596bf60f5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
C library is not actually used by the xtensa port, we only need the
'exit' function. Implement 'exit' in crt1-* and drop remaining
references to the C library.
Change-Id: I8a562363956b4755a6b5baee7acf3726485e5ce3
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Add QEMU_CPU_TYPE for the sample_controller, so that zephyr image could
be run on QEMU with sample_controller core.
Change-Id: Id9e97a43c4b7921142289dcf97ff782993ca0463
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
XT_* macros are defined in xtensa HAL headers as xcc intrinsics. gcc
does not have any of these intrinsics. Replace XT_* macros with inline
assembly or provide gcc-compatible definitions.
Change-Id: If823ea8a7898a11a3a8363b17efdba27dee4c6a4
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
