thread_stack.h

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/*
 * Copyright (c) 2022 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_XTENSA_THREAD_STACK_H_
#define ZEPHYR_INCLUDE_ARCH_XTENSA_THREAD_STACK_H_
 
#include <xtensa/config/core-isa.h>
#include <zephyr/toolchain.h>
#include <zephyr/sys/util.h>
 
#ifdef CONFIG_KERNEL_COHERENCE
#define ARCH_STACK_PTR_ALIGN XCHAL_DCACHE_LINESIZE
#else
#define ARCH_STACK_PTR_ALIGN 16
#endif
 
 
#ifdef CONFIG_USERSPACE
#ifdef CONFIG_XTENSA_MMU
#define XTENSA_STACK_BASE_ALIGN         CONFIG_MMU_PAGE_SIZE
#define XTENSA_STACK_SIZE_ALIGN         CONFIG_MMU_PAGE_SIZE
#endif
#ifdef CONFIG_XTENSA_MPU
#define XTENSA_STACK_BASE_ALIGN         XCHAL_MPU_ALIGN
#define XTENSA_STACK_SIZE_ALIGN         XCHAL_MPU_ALIGN
#endif
#else
#define XTENSA_STACK_BASE_ALIGN         ARCH_STACK_PTR_ALIGN
#define XTENSA_STACK_SIZE_ALIGN         ARCH_STACK_PTR_ALIGN
#endif
 
/*
 *
 * High memory addresses
 *
 * +-------------------+ <- thread.stack_info.start + thread.stack_info.size
 * |       TLS         |
 * +-------------------+ <- initial sp (computable with thread.stack_info.delta)
 * |                   |
 * |   Thread stack    |
 * |                   |
 * +-------------------+ <- thread.stack_info.start
 * | Privileged stack  | } CONFIG_MMU_PAGE_SIZE
 * +-------------------+ <- thread.stack_obj
 *
 * Low Memory addresses
 */
 
#ifndef _ASMLANGUAGE
 
/* thread stack */
struct xtensa_thread_stack_header {
#if defined(CONFIG_XTENSA_MMU) || defined(CONFIG_XTENSA_MPU)
        char privilege_stack[CONFIG_PRIVILEGED_STACK_SIZE];
#endif /* CONFIG_XTENSA_MPU */
} __packed __aligned(XTENSA_STACK_BASE_ALIGN);
struct xtensa_thread_stack_header {…};
 
#if defined(CONFIG_XTENSA_MMU) || defined(CONFIG_XTENSA_MPU)
#define ARCH_THREAD_STACK_RESERVED              \
        sizeof(struct xtensa_thread_stack_header)
#endif /* CONFIG_XTENSA_MMU || CONFIG_XTENSA_MPU */
 
#define ARCH_THREAD_STACK_OBJ_ALIGN(size)       XTENSA_STACK_BASE_ALIGN
#define ARCH_THREAD_STACK_SIZE_ADJUST(size)     \
        ROUND_UP((size), XTENSA_STACK_SIZE_ALIGN)
#define ARCH_THREAD_STACK_SIZE_ADJUST(size)     \ …
 
/* kernel stack */
#define ARCH_KERNEL_STACK_OBJ_ALIGN             ARCH_STACK_PTR_ALIGN
 
#endif /* _ASMLANGUAGE */
 
#endif