kernel: move kernel object APIs to own header
Part of an effort to break up the gigantic kernel.h. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie
Anas Nashif
parent
c765b92944
commit
95bbc742ba
5 changed files with 329 additions and 299 deletions
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@ -406,6 +406,7 @@
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/include/sw_isr_table.h @andrewboie @andyross
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/include/sys_clock.h @andrewboie @andyross
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/include/sys/sys_io.h @andrewboie @andyross
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/include/sys/kobject.h @andrewboie
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/include/toolchain.h @andrewboie @andyross @nashif
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/include/toolchain/ @andrewboie @andyross
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/include/zephyr.h @andrewboie @andyross
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299
include/kernel.h
299
include/kernel.h
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@ -109,305 +109,6 @@ struct k_poll_signal;
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struct k_mem_domain;
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struct k_mem_partition;
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struct k_futex;
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struct z_futex_data;
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/**
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* @brief Kernel Object Types
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*
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* This enumeration needs to be kept in sync with the lists of kernel objects
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* and subsystems in scripts/gen_kobject_list.py, as well as the otype_to_str()
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* function in kernel/userspace.c
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*/
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enum k_objects {
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K_OBJ_ANY,
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/** @cond
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* Doxygen should ignore this build-time generated include file
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* when genrating API documentation. Enumeration values are
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* generated during build by gen_kobject_list.py. It includes
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* basic kernel objects (e.g. pipes and mutexes) and driver types.
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*/
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#include <kobj-types-enum.h>
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/** @endcond
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*/
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K_OBJ_LAST
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};
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/**
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* @defgroup usermode_apis User Mode APIs
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* @ingroup kernel_apis
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* @{
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*/
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#ifdef CONFIG_USERSPACE
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#ifdef CONFIG_GEN_PRIV_STACKS
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/* Metadata struct for K_OBJ_THREAD_STACK_ELEMENT */
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struct z_stack_data {
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/* Size of the entire stack object, including reserved areas */
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size_t size;
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/* Stack buffer for privilege mode elevations */
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uint8_t *priv;
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};
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#endif /* CONFIG_GEN_PRIV_STACKS */
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/* Object extra data. Only some objects use this, determined by object type */
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union z_object_data {
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/* Backing mutex for K_OBJ_SYS_MUTEX */
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struct k_mutex *mutex;
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/* Numerical thread ID for K_OBJ_THREAD */
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unsigned int thread_id;
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#ifdef CONFIG_GEN_PRIV_STACKS
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/* Metadata for K_OBJ_THREAD_STACK_ELEMENT */
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struct z_stack_data *stack_data;
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#else
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/* Stack buffer size for K_OBJ_THREAD_STACK_ELEMENT */
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size_t stack_size;
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#endif /* CONFIG_GEN_PRIV_STACKS */
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/* Futex wait queue and spinlock for K_OBJ_FUTEX */
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struct z_futex_data *futex_data;
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/* All other objects */
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int unused;
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};
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/* Table generated by gperf, these objects are retrieved via
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* z_object_find() */
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struct z_object {
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void *name;
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uint8_t perms[CONFIG_MAX_THREAD_BYTES];
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uint8_t type;
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uint8_t flags;
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union z_object_data data;
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} __packed __aligned(4);
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struct z_object_assignment {
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struct k_thread *thread;
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void * const *objects;
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};
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/**
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* @brief Grant a static thread access to a list of kernel objects
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*
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* For threads declared with K_THREAD_DEFINE(), grant the thread access to
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* a set of kernel objects. These objects do not need to be in an initialized
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* state. The permissions will be granted when the threads are initialized
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* in the early boot sequence.
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*
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* All arguments beyond the first must be pointers to kernel objects.
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*
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* @param name_ Name of the thread, as passed to K_THREAD_DEFINE()
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*/
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#define K_THREAD_ACCESS_GRANT(name_, ...) \
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static void * const _CONCAT(_object_list_, name_)[] = \
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{ __VA_ARGS__, NULL }; \
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static const Z_STRUCT_SECTION_ITERABLE(z_object_assignment, \
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_CONCAT(_object_access_, name_)) = \
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{ (&_k_thread_obj_ ## name_), \
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(_CONCAT(_object_list_, name_)) }
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/** Object initialized */
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#define K_OBJ_FLAG_INITIALIZED BIT(0)
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/** Object is Public */
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#define K_OBJ_FLAG_PUBLIC BIT(1)
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/** Object allocated */
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#define K_OBJ_FLAG_ALLOC BIT(2)
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/** Driver Object */
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#define K_OBJ_FLAG_DRIVER BIT(3)
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/**
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* Lookup a kernel object and init its metadata if it exists
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*
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* Calling this on an object will make it usable from userspace.
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* Intended to be called as the last statement in kernel object init
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* functions.
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*
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* @param obj Address of the kernel object
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*/
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void z_object_init(const void *obj);
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#else
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/* LCOV_EXCL_START */
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#define K_THREAD_ACCESS_GRANT(thread, ...)
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/**
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* @internal
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*/
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static inline void z_object_init(const void *obj)
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{
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ARG_UNUSED(obj);
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}
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/**
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* @internal
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*/
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static inline void z_impl_k_object_access_grant(const void *object,
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struct k_thread *thread)
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{
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ARG_UNUSED(object);
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ARG_UNUSED(thread);
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}
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/**
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* @internal
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*/
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static inline void k_object_access_revoke(const void *object,
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struct k_thread *thread)
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{
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ARG_UNUSED(object);
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ARG_UNUSED(thread);
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}
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/**
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* @internal
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*/
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static inline void z_impl_k_object_release(const void *object)
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{
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ARG_UNUSED(object);
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}
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static inline void k_object_access_all_grant(const void *object)
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{
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ARG_UNUSED(object);
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}
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/* LCOV_EXCL_STOP */
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#endif /* !CONFIG_USERSPACE */
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/**
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* Grant a thread access to a kernel object
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*
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* The thread will be granted access to the object if the caller is from
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* supervisor mode, or the caller is from user mode AND has permissions
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* on both the object and the thread whose access is being granted.
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*
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* @param object Address of kernel object
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* @param thread Thread to grant access to the object
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*/
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__syscall void k_object_access_grant(const void *object,
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struct k_thread *thread);
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/**
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* Revoke a thread's access to a kernel object
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*
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* The thread will lose access to the object if the caller is from
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* supervisor mode, or the caller is from user mode AND has permissions
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* on both the object and the thread whose access is being revoked.
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*
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* @param object Address of kernel object
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* @param thread Thread to remove access to the object
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*/
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void k_object_access_revoke(const void *object, struct k_thread *thread);
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/**
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* @brief Release an object
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*
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* Allows user threads to drop their own permission on an object
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* Their permissions are automatically cleared when a thread terminates.
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*
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* @param object The object to be released
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*
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*/
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__syscall void k_object_release(const void *object);
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/**
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* Grant all present and future threads access to an object
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*
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* If the caller is from supervisor mode, or the caller is from user mode and
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* have sufficient permissions on the object, then that object will have
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* permissions granted to it for *all* current and future threads running in
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* the system, effectively becoming a public kernel object.
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*
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* Use of this API should be avoided on systems that are running untrusted code
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* as it is possible for such code to derive the addresses of kernel objects
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* and perform unwanted operations on them.
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*
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* It is not possible to revoke permissions on public objects; once public,
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* any thread may use it.
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*
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* @param object Address of kernel object
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*/
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void k_object_access_all_grant(const void *object);
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/**
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* Allocate a kernel object of a designated type
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*
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* This will instantiate at runtime a kernel object of the specified type,
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* returning a pointer to it. The object will be returned in an uninitialized
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* state, with the calling thread being granted permission on it. The memory
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* for the object will be allocated out of the calling thread's resource pool.
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*
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* Currently, allocation of thread stacks is not supported.
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*
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* @param otype Requested kernel object type
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* @return A pointer to the allocated kernel object, or NULL if memory wasn't
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* available
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*/
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__syscall void *k_object_alloc(enum k_objects otype);
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#ifdef CONFIG_DYNAMIC_OBJECTS
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/**
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* Allocate memory and install as a generic kernel object
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*
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* This is a low-level function to allocate some memory, and register that
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* allocated memory in the kernel object lookup tables with type K_OBJ_ANY.
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* Initialization state and thread permissions will be cleared. The
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* returned z_object's data value will be uninitialized.
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*
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* Most users will want to use k_object_alloc() instead.
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*
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* Memory allocated will be drawn from the calling thread's reasource pool
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* and may be freed later by passing the actual object pointer (found
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* in the returned z_object's 'name' member) to k_object_free().
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*
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* @param size Size of the allocated object
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* @return NULL on insufficient memory
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* @return A pointer to the associated z_object that is installed in the
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* kernel object tables
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*/
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struct z_object *z_dynamic_object_create(size_t size);
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/**
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* Free a kernel object previously allocated with k_object_alloc()
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*
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* This will return memory for a kernel object back to resource pool it was
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* allocated from. Care must be exercised that the object will not be used
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* during or after when this call is made.
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*
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* @param obj Pointer to the kernel object memory address.
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*/
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void k_object_free(void *obj);
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#else
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/* LCOV_EXCL_START */
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static inline void *z_impl_k_object_alloc(enum k_objects otype)
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{
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ARG_UNUSED(otype);
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return NULL;
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}
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static inline struct z_object *z_dynamic_object_create(size_t size)
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{
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ARG_UNUSED(size);
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return NULL;
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}
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/**
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* @brief Free an object
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*
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* @param obj
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*/
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static inline void k_object_free(void *obj)
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{
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ARG_UNUSED(obj);
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}
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/* LCOV_EXCL_STOP */
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#endif /* CONFIG_DYNAMIC_OBJECTS */
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/** @} */
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/**
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* @typedef k_thread_entry_t
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@ -43,5 +43,6 @@
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#include <irq.h>
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#include <sys/thread_stack.h>
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#include <app_memory/mem_domain.h>
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#include <sys/kobject.h>
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#endif /* ZEPHYR_INCLUDE_KERNEL_INCLUDES_H_ */
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322
include/sys/kobject.h
Normal file
322
include/sys/kobject.h
Normal file
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@ -0,0 +1,322 @@
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/*
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_SYS_KOBJECT_H
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#define ZEPHYR_INCLUDE_SYS_KOBJECT_H
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#include <stdint.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct k_thread;
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struct k_mutex;
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struct z_futex_data;
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/**
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* @brief Kernel Object Types
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*
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* This enumeration needs to be kept in sync with the lists of kernel objects
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* and subsystems in scripts/gen_kobject_list.py, as well as the otype_to_str()
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* function in kernel/userspace.c
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*/
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enum k_objects {
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K_OBJ_ANY,
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/** @cond
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* Doxygen should ignore this build-time generated include file
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* when genrating API documentation. Enumeration values are
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* generated during build by gen_kobject_list.py. It includes
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* basic kernel objects (e.g. pipes and mutexes) and driver types.
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*/
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#include <kobj-types-enum.h>
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/** @endcond
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*/
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K_OBJ_LAST
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};
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/**
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* @defgroup usermode_apis User Mode APIs
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* @ingroup kernel_apis
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* @{
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*/
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#ifdef CONFIG_USERSPACE
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#ifdef CONFIG_GEN_PRIV_STACKS
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/* Metadata struct for K_OBJ_THREAD_STACK_ELEMENT */
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struct z_stack_data {
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/* Size of the entire stack object, including reserved areas */
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size_t size;
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/* Stack buffer for privilege mode elevations */
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uint8_t *priv;
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};
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#endif /* CONFIG_GEN_PRIV_STACKS */
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/* Object extra data. Only some objects use this, determined by object type */
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union z_object_data {
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/* Backing mutex for K_OBJ_SYS_MUTEX */
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struct k_mutex *mutex;
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/* Numerical thread ID for K_OBJ_THREAD */
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unsigned int thread_id;
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#ifdef CONFIG_GEN_PRIV_STACKS
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/* Metadata for K_OBJ_THREAD_STACK_ELEMENT */
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struct z_stack_data *stack_data;
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#else
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/* Stack buffer size for K_OBJ_THREAD_STACK_ELEMENT */
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size_t stack_size;
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#endif /* CONFIG_GEN_PRIV_STACKS */
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/* Futex wait queue and spinlock for K_OBJ_FUTEX */
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struct z_futex_data *futex_data;
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/* All other objects */
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int unused;
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};
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/* Table generated by gperf, these objects are retrieved via
|
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* z_object_find() */
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struct z_object {
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void *name;
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uint8_t perms[CONFIG_MAX_THREAD_BYTES];
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uint8_t type;
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uint8_t flags;
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union z_object_data data;
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} __packed __aligned(4);
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struct z_object_assignment {
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struct k_thread *thread;
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void * const *objects;
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};
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|
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/**
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* @brief Grant a static thread access to a list of kernel objects
|
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*
|
||||
* For threads declared with K_THREAD_DEFINE(), grant the thread access to
|
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* a set of kernel objects. These objects do not need to be in an initialized
|
||||
* state. The permissions will be granted when the threads are initialized
|
||||
* in the early boot sequence.
|
||||
*
|
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* All arguments beyond the first must be pointers to kernel objects.
|
||||
*
|
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* @param name_ Name of the thread, as passed to K_THREAD_DEFINE()
|
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*/
|
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#define K_THREAD_ACCESS_GRANT(name_, ...) \
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static void * const _CONCAT(_object_list_, name_)[] = \
|
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{ __VA_ARGS__, NULL }; \
|
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static const Z_STRUCT_SECTION_ITERABLE(z_object_assignment, \
|
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_CONCAT(_object_access_, name_)) = \
|
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{ (&_k_thread_obj_ ## name_), \
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(_CONCAT(_object_list_, name_)) }
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/** Object initialized */
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#define K_OBJ_FLAG_INITIALIZED BIT(0)
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/** Object is Public */
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#define K_OBJ_FLAG_PUBLIC BIT(1)
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/** Object allocated */
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#define K_OBJ_FLAG_ALLOC BIT(2)
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/** Driver Object */
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#define K_OBJ_FLAG_DRIVER BIT(3)
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/**
|
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* Lookup a kernel object and init its metadata if it exists
|
||||
*
|
||||
* Calling this on an object will make it usable from userspace.
|
||||
* Intended to be called as the last statement in kernel object init
|
||||
* functions.
|
||||
*
|
||||
* @param obj Address of the kernel object
|
||||
*/
|
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void z_object_init(const void *obj);
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#else
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/* LCOV_EXCL_START */
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#define K_THREAD_ACCESS_GRANT(thread, ...)
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/**
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* @internal
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*/
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static inline void z_object_init(const void *obj)
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{
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ARG_UNUSED(obj);
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}
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|
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/**
|
||||
* @internal
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||||
*/
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static inline void z_impl_k_object_access_grant(const void *object,
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struct k_thread *thread)
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{
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ARG_UNUSED(object);
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ARG_UNUSED(thread);
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}
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|
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/**
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* @internal
|
||||
*/
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static inline void k_object_access_revoke(const void *object,
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struct k_thread *thread)
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{
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ARG_UNUSED(object);
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ARG_UNUSED(thread);
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}
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||||
|
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/**
|
||||
* @internal
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||||
*/
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||||
static inline void z_impl_k_object_release(const void *object)
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{
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ARG_UNUSED(object);
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}
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static inline void k_object_access_all_grant(const void *object)
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{
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ARG_UNUSED(object);
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}
|
||||
/* LCOV_EXCL_STOP */
|
||||
#endif /* !CONFIG_USERSPACE */
|
||||
|
||||
/**
|
||||
* Grant a thread access to a kernel object
|
||||
*
|
||||
* The thread will be granted access to the object if the caller is from
|
||||
* supervisor mode, or the caller is from user mode AND has permissions
|
||||
* on both the object and the thread whose access is being granted.
|
||||
*
|
||||
* @param object Address of kernel object
|
||||
* @param thread Thread to grant access to the object
|
||||
*/
|
||||
__syscall void k_object_access_grant(const void *object,
|
||||
struct k_thread *thread);
|
||||
|
||||
/**
|
||||
* Revoke a thread's access to a kernel object
|
||||
*
|
||||
* The thread will lose access to the object if the caller is from
|
||||
* supervisor mode, or the caller is from user mode AND has permissions
|
||||
* on both the object and the thread whose access is being revoked.
|
||||
*
|
||||
* @param object Address of kernel object
|
||||
* @param thread Thread to remove access to the object
|
||||
*/
|
||||
void k_object_access_revoke(const void *object, struct k_thread *thread);
|
||||
|
||||
/**
|
||||
* @brief Release an object
|
||||
*
|
||||
* Allows user threads to drop their own permission on an object
|
||||
* Their permissions are automatically cleared when a thread terminates.
|
||||
*
|
||||
* @param object The object to be released
|
||||
*
|
||||
*/
|
||||
__syscall void k_object_release(const void *object);
|
||||
|
||||
/**
|
||||
* Grant all present and future threads access to an object
|
||||
*
|
||||
* If the caller is from supervisor mode, or the caller is from user mode and
|
||||
* have sufficient permissions on the object, then that object will have
|
||||
* permissions granted to it for *all* current and future threads running in
|
||||
* the system, effectively becoming a public kernel object.
|
||||
*
|
||||
* Use of this API should be avoided on systems that are running untrusted code
|
||||
* as it is possible for such code to derive the addresses of kernel objects
|
||||
* and perform unwanted operations on them.
|
||||
*
|
||||
* It is not possible to revoke permissions on public objects; once public,
|
||||
* any thread may use it.
|
||||
*
|
||||
* @param object Address of kernel object
|
||||
*/
|
||||
void k_object_access_all_grant(const void *object);
|
||||
|
||||
/**
|
||||
* Allocate a kernel object of a designated type
|
||||
*
|
||||
* This will instantiate at runtime a kernel object of the specified type,
|
||||
* returning a pointer to it. The object will be returned in an uninitialized
|
||||
* state, with the calling thread being granted permission on it. The memory
|
||||
* for the object will be allocated out of the calling thread's resource pool.
|
||||
*
|
||||
* Currently, allocation of thread stacks is not supported.
|
||||
*
|
||||
* @param otype Requested kernel object type
|
||||
* @return A pointer to the allocated kernel object, or NULL if memory wasn't
|
||||
* available
|
||||
*/
|
||||
__syscall void *k_object_alloc(enum k_objects otype);
|
||||
|
||||
#ifdef CONFIG_DYNAMIC_OBJECTS
|
||||
/**
|
||||
* Allocate memory and install as a generic kernel object
|
||||
*
|
||||
* This is a low-level function to allocate some memory, and register that
|
||||
* allocated memory in the kernel object lookup tables with type K_OBJ_ANY.
|
||||
* Initialization state and thread permissions will be cleared. The
|
||||
* returned z_object's data value will be uninitialized.
|
||||
*
|
||||
* Most users will want to use k_object_alloc() instead.
|
||||
*
|
||||
* Memory allocated will be drawn from the calling thread's reasource pool
|
||||
* and may be freed later by passing the actual object pointer (found
|
||||
* in the returned z_object's 'name' member) to k_object_free().
|
||||
*
|
||||
* @param size Size of the allocated object
|
||||
* @return NULL on insufficient memory
|
||||
* @return A pointer to the associated z_object that is installed in the
|
||||
* kernel object tables
|
||||
*/
|
||||
struct z_object *z_dynamic_object_create(size_t size);
|
||||
|
||||
/**
|
||||
* Free a kernel object previously allocated with k_object_alloc()
|
||||
*
|
||||
* This will return memory for a kernel object back to resource pool it was
|
||||
* allocated from. Care must be exercised that the object will not be used
|
||||
* during or after when this call is made.
|
||||
*
|
||||
* @param obj Pointer to the kernel object memory address.
|
||||
*/
|
||||
void k_object_free(void *obj);
|
||||
#else
|
||||
/* LCOV_EXCL_START */
|
||||
static inline void *z_impl_k_object_alloc(enum k_objects otype)
|
||||
{
|
||||
ARG_UNUSED(otype);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline struct z_object *z_dynamic_object_create(size_t size)
|
||||
{
|
||||
ARG_UNUSED(size);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Free an object
|
||||
*
|
||||
* @param obj
|
||||
*/
|
||||
static inline void k_object_free(void *obj)
|
||||
{
|
||||
ARG_UNUSED(obj);
|
||||
}
|
||||
/* LCOV_EXCL_STOP */
|
||||
#endif /* CONFIG_DYNAMIC_OBJECTS */
|
||||
|
||||
/** @} */
|
||||
|
||||
#include <syscalls/kobject.h>
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
5
subsys/testsuite/ztest/include/syscalls/kobject.h
Normal file
5
subsys/testsuite/ztest/include/syscalls/kobject.h
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
/*
|
||||
* Copyright (c) 2020 Intel Corporation
|
||||
*
|
||||
* SPDX-License-Identifier: Apache-2.0
|
||||
*/
|
||||
Loading…
Add table
Add a link
Reference in a new issue