app_memdomain.h

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/*
 * Copyright (c) 2019 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef ZEPHYR_INCLUDE_APP_MEMORY_APP_MEMDOMAIN_H_
#define ZEPHYR_INCLUDE_APP_MEMORY_APP_MEMDOMAIN_H_
 
#include <zephyr/linker/linker-defs.h>
#include <zephyr/sys/dlist.h>
#include <zephyr/kernel.h>

 
#ifdef CONFIG_USERSPACE

#define K_APP_DMEM_SECTION(id) data_smem_##id##_data

#define K_APP_BMEM_SECTION(id) data_smem_##id##_bss

#define K_APP_DMEM(id) Z_GENERIC_SECTION(K_APP_DMEM_SECTION(id))

#define K_APP_BMEM(id) Z_GENERIC_SECTION(K_APP_BMEM_SECTION(id))
 
struct z_app_region {
        void *bss_start;
        size_t bss_size;
};
 
#define Z_APP_START(id) z_data_smem_##id##_part_start
#define Z_APP_SIZE(id) z_data_smem_##id##_part_size
#define Z_APP_BSS_START(id) z_data_smem_##id##_bss_start
#define Z_APP_BSS_SIZE(id) z_data_smem_##id##_bss_size
 
/* If a partition is declared with K_APPMEM_PARTITION, but never has any
 * data assigned to its contents, then no symbols with its prefix will end
 * up in the symbol table. This prevents gen_app_partitions.py from detecting
 * that the partition exists, and the linker symbols which specify partition
 * bounds will not be generated, resulting in build errors.
 *
 * What this inline assembly code does is define a symbol with no data.
 * This should work for all arches that produce ELF binaries, see
 * https://sourceware.org/binutils/docs/as/Section.html
 *
 * We don't know what active flags/type of the pushed section were, so we are
 * specific: "aw" indicates section is allocatable and writable,
 * and "@progbits" indicates the section has data.
 */
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
/* ARM has a quirk in that '@' denotes a comment, so we have to send
 * %progbits to the assembler instead.
 */
#define Z_PROGBITS_SYM  "%"
#else
#define Z_PROGBITS_SYM "@"
#endif
 
#define Z_APPMEM_PLACEHOLDER(name) \
        __asm__ ( \
                PUSHSECTION_DIRECTIVE " " STRINGIFY(K_APP_DMEM_SECTION(name)) \
                        ",\"aw\"," Z_PROGBITS_SYM "progbits\n\t" \
                ".global " STRINGIFY(name) "_placeholder\n\t" \
                STRINGIFY(name) "_placeholder:\n\t" \
                POPSECTION_DIRECTIVE "\n\t")

#define K_APPMEM_PARTITION_DEFINE(name) \
        extern char Z_APP_START(name)[]; \
        extern char Z_APP_SIZE(name)[]; \
        struct k_mem_partition name = { \
                .start = (uintptr_t) &Z_APP_START(name)[0], \
                .size = (size_t) &Z_APP_SIZE(name)[0], \
                .attr = K_MEM_PARTITION_P_RW_U_RW \
        }; \
        extern char Z_APP_BSS_START(name)[]; \
        extern char Z_APP_BSS_SIZE(name)[]; \
        Z_GENERIC_SECTION(.app_regions.name) \
        const struct z_app_region name##_region = { \
                .bss_start = &Z_APP_BSS_START(name)[0], \
                .bss_size = (size_t) &Z_APP_BSS_SIZE(name)[0] \
        }; \
        Z_APPMEM_PLACEHOLDER(name)
#else
 
#define K_APP_BMEM(ptn)
#define K_APP_DMEM(ptn)
#define K_APP_DMEM_SECTION(ptn) .data
#define K_APP_BMEM_SECTION(ptn) .bss
#define K_APPMEM_PARTITION_DEFINE(name)
 
#endif /* CONFIG_USERSPACE */

 
#endif /* ZEPHYR_INCLUDE_APP_MEMORY_APP_MEMDOMAIN_H_ */