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kernel/stack: Introduce K_THREAD_STACK_LEN macro

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This is a public macro which calculates the size to be allocated for
stacks inside a stack array. This is necessitated because of some
internal padding (e.g. for MPU scenarios). This is particularly
useful when a reference to K_THREAD_STACK_ARRAY_DEFINE needs to be
made from within a struct.

Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>
This commit is contained in:
Rajavardhan Gundi 2018-06-27 13:26:20 +05:30 • committed by Andrew Boie
commit d4dd928eaa
4 changed files with 53 additions and 12 deletions
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21
include/arch/arm/arch.h
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@ -153,6 +153,23 @@ extern "C" {
sym[size+MPU_GUARD_ALIGN_AND_SIZE]
#endif
/**
* @brief Calculate size of stacks to be allocated in a stack array
*
* This macro calculates the size to be allocated for the stacks
* inside a stack array. It accepts the indicated "size" as a parameter
* and if required, pads some extra bytes (e.g. for MPU scenarios). Refer
* K_THREAD_STACK_ARRAY_DEFINE definition to see how this is used.
*
* @param size Size of the stack memory region
*/
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define _ARCH_THREAD_STACK_LEN(size) (POW2_CEIL(size))
#else
#define _ARCH_THREAD_STACK_LEN(size) ((size)+MPU_GUARD_ALIGN_AND_SIZE)
#endif
/**
* @brief Declare a toplevel array of thread stack memory regions
*
@ -171,12 +188,12 @@ extern "C" {
#define _ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
struct _k_thread_stack_element __kernel_noinit \
__aligned(POW2_CEIL(size)) \
sym[nmemb][POW2_CEIL(size)]
sym[nmemb][_ARCH_THREAD_STACK_LEN(size)]
#else
#define _ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
struct _k_thread_stack_element __kernel_noinit \
__aligned(STACK_ALIGN) \
sym[nmemb][size+MPU_GUARD_ALIGN_AND_SIZE]
sym[nmemb][_ARCH_THREAD_STACK_LEN(size)]
#endif
/**