bartoszek/zephyr
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
d82febd2a3
zephyr/include/arch/arm/arch.h
Andrew Boie 575abc0150 kernel: add K_THREAD_STACK_RESERVED 
This is used to have each arch canonically state how much
room in the stack object is reserved for non-thread use.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2019-03-20 13:59:26 -07:00

194 lines
5.8 KiB
C
Raw Blame History

/*
* Copyright (c) 2013-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief ARM specific kernel interface header
*
* This header contains the ARM specific kernel interface. It is
* included by the kernel interface architecture-abstraction header
* (include/arm/cpu.h)
*/
#ifndef ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_
#define ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_
/* Add include for DTS generated information */
#include <generated_dts_board.h>
/* ARM GPRs are often designated by two different names */
#define sys_define_gpr_with_alias(name1, name2) union { u32_t name1, name2; }
#ifdef CONFIG_CPU_CORTEX_M
#include <arch/arm/cortex_m/exc.h>
#include <arch/arm/cortex_m/irq.h>
#include <arch/arm/cortex_m/error.h>
#include <arch/arm/cortex_m/misc.h>
#include <arch/arm/cortex_m/memory_map.h>
#include <arch/arm/cortex_m/asm_inline.h>
#include <arch/arm/cortex_m/addr_types.h>
#include <arch/arm/cortex_m/sys_io.h>
#include <arch/arm/cortex_m/nmi.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Declare the STACK_ALIGN_SIZE
*
* Denotes the required alignment of the stack pointer on public API
* boundaries
*
*/
#ifdef CONFIG_STACK_ALIGN_DOUBLE_WORD
#define STACK_ALIGN_SIZE 8
#else
#define STACK_ALIGN_SIZE 4
#endif
/**
* @brief Declare a minimum MPU guard alignment and size
*
* This specifies the minimum MPU guard alignment/size for the MPU. This
* will be used to denote the guard section of the stack, if it exists.
*
* One key note is that this guard results in extra bytes being added to
* the stack. APIs which give the stack ptr and stack size will take this
* guard size into account.
*
* Stack is allocated, but initial stack pointer is at the end
* (highest address). Stack grows down to the actual allocation
* address (lowest address). Stack guard, if present, will comprise
* the lowest MPU_GUARD_ALIGN_AND_SIZE bytes of the stack.
*
* As the stack grows down, it will reach the end of the stack when it
* encounters either the stack guard region, or the stack allocation
* address.
*
* ----------------------- <---- Stack allocation address + stack size +
* | | MPU_GUARD_ALIGN_AND_SIZE
* | Some thread data | <---- Defined when thread is created
* | ... |
* |---------------------| <---- Actual initial stack ptr
* | Initial Stack Ptr | aligned to STACK_ALIGN_SIZE
* | ... |
* | ... |
* | ... |
* | ... |
* | ... |
* | ... |
* | ... |
* | ... |
* | Stack Ends |
* |---------------------- <---- Stack Buffer Ptr from API
* | MPU Guard, |
* | if present |
* ----------------------- <---- Stack Allocation address
*
*/
#if defined(CONFIG_MPU_STACK_GUARD)
#define MPU_GUARD_ALIGN_AND_SIZE CONFIG_ARM_MPU_REGION_MIN_ALIGN_AND_SIZE
#else
#define MPU_GUARD_ALIGN_AND_SIZE 0
#endif
/**
* @brief Define alignment of a stack buffer
*
* This is used for two different things:
* 1) Used in checks for stack size to be a multiple of the stack buffer
* alignment
* 2) Used to determine the alignment of a stack buffer
*
*/
#if defined(CONFIG_USERSPACE)
#define STACK_ALIGN CONFIG_ARM_MPU_REGION_MIN_ALIGN_AND_SIZE
#else
#define STACK_ALIGN MAX(STACK_ALIGN_SIZE, MPU_GUARD_ALIGN_AND_SIZE)
#endif
/**
* @brief Calculate power of two ceiling for a buffer size input
*
*/
#define POW2_CEIL(x) ((1 << (31 - __builtin_clz(x))) < x ? \
1 << (31 - __builtin_clz(x) + 1) : \
1 << (31 - __builtin_clz(x)))
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
/* Guard is 'carved-out' of the thread stack region, and the supervisor
* mode stack is allocated elsewhere by gen_priv_stack.py
*/
#define Z_ARCH_THREAD_STACK_RESERVED 0
#else
#define Z_ARCH_THREAD_STACK_RESERVED MPU_GUARD_ALIGN_AND_SIZE
#endif
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define Z_ARCH_THREAD_STACK_DEFINE(sym, size) \
struct _k_thread_stack_element __noinit \
__aligned(POW2_CEIL(size)) sym[POW2_CEIL(size)]
#else
#define Z_ARCH_THREAD_STACK_DEFINE(sym, size) \
struct _k_thread_stack_element __noinit __aligned(STACK_ALIGN) \
sym[size+MPU_GUARD_ALIGN_AND_SIZE]
#endif
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define Z_ARCH_THREAD_STACK_LEN(size) (POW2_CEIL(size))
#else
#define Z_ARCH_THREAD_STACK_LEN(size) ((size)+MPU_GUARD_ALIGN_AND_SIZE)
#endif
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define Z_ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
struct _k_thread_stack_element __noinit \
__aligned(POW2_CEIL(size)) \
sym[nmemb][Z_ARCH_THREAD_STACK_LEN(size)]
#else
#define Z_ARCH_THREAD_STACK_ARRAY_DEFINE(sym, nmemb, size) \
struct _k_thread_stack_element __noinit \
__aligned(STACK_ALIGN) \
sym[nmemb][Z_ARCH_THREAD_STACK_LEN(size)]
#endif
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define Z_ARCH_THREAD_STACK_MEMBER(sym, size) \
struct _k_thread_stack_element __aligned(POW2_CEIL(size)) \
sym[POW2_CEIL(size)]
#else
#define Z_ARCH_THREAD_STACK_MEMBER(sym, size) \
struct _k_thread_stack_element __aligned(STACK_ALIGN) \
sym[size+MPU_GUARD_ALIGN_AND_SIZE]
#endif
#define Z_ARCH_THREAD_STACK_SIZEOF(sym) (sizeof(sym) - MPU_GUARD_ALIGN_AND_SIZE)
#define Z_ARCH_THREAD_STACK_BUFFER(sym) \
((char *)(sym) + MPU_GUARD_ALIGN_AND_SIZE)
#ifdef CONFIG_ARM_MPU
#ifdef CONFIG_CPU_HAS_ARM_MPU
#include <arch/arm/cortex_m/mpu/arm_mpu.h>
#endif /* CONFIG_CPU_HAS_ARM_MPU */
#ifdef CONFIG_CPU_HAS_NXP_MPU
#include <arch/arm/cortex_m/mpu/nxp_mpu.h>
#endif /* CONFIG_CPU_HAS_NXP_MPU */
#endif /* CONFIG_ARM_MPU */
#ifdef __cplusplus
}
#endif
#endif /* ZEPHYR_INCLUDE_ARCH_ARM_ARCH_H_ */
Reference in New Issue View Git Blame Copy Permalink