The exclusive load/store instructions don't work well when MMU and cache
are disabled on some cores e.g. Cortex-A72. Change it to voting lock[1]
to select the primary core when multi-cores boot simultaneously.
The voting lock has reasonable but minimal requirements on the memory
system.
[1] https://www.kernel.org/doc/html/next/arch/arm/vlocks.html
Signed-off-by: Jaxson Han <jaxson.han@arm.com>
The is code duplication as one is in C, and the other is an assembly
macro. As there is no easy way to find out about this duplication,
adding a comment seems the best way to go.
Signed-off-by: Henri Xavier <datacomos@huawei.com>
This is an uint32_t so the proper register width must be used, otherwise
the adjacent structure member will be overwritten (didn't happen in
practice because of struct member alignment but still). This makes the
inc_nest_counter and dec_nest_counter macros rather unwieldy, especially
with upcoming changes, so let's just remove them.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Let's fully exploit tpidrro_el0 by storing in it the current CPU's
struct _cpu instance alongside the userspace mode flag bit. This
greatly simplifies the code needed to get at the cpu structure, and
this paves the way to much simpler multi cluster support, as there
is no longer the need to decode MPIDR all the time.
The same code is used in the !SMP case as there are benefits there too
such as avoiding the literal pool, and it looks cleaner.
The tpidrro_el0 value is no longer stored in the exception stack frame.
Instead, we simply restore the user mode flag based on the SPSR value.
This way, more flag bits could be used independently in the future.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Currently _curr_cpu is only used by the get_cpu macro to quickly access
the cpu struct. This is not really necessary because we can access to
the struct by directly referencing &(_kernel.cpus[cpu_num]) in assembly
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Split ARM and ARM64 architectures.
Details:
- CONFIG_ARM64 is decoupled from CONFIG_ARM (not a subset anymore)
- Arch and include AArch64 files are in a dedicated directory
(arch/arm64 and include/arch/arm64)
- AArch64 boards and SoC are moved to soc/arm64 and boards/arm64
- AArch64-specific DTS files are moved to dts/arm64
- The A72 support for the bcm_vk/viper board is moved in the
boards/bcm_vk/viper directory
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-03-31 10:34:33 -05:00
Renamed from arch/arm/core/aarch64/macro_priv.inc (Browse further)
