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/**
* @file
*
* @ingroup arm_start
*
* @brief ARM system low level start.
*/
/*
* Copyright (c) 2008-2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef LIBBSP_ARM_SHARED_START_H
#define LIBBSP_ARM_SHARED_START_H
#include <string.h>
#include <bsp/linker-symbols.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup arm_start System Start
*
* @ingroup arm_shared
*
* @brief ARM system low level start.
*
* @{
*/
#define BSP_START_TEXT_SECTION __attribute__((section(".bsp_start_text")))
#define BSP_START_DATA_SECTION __attribute__((section(".bsp_start_data")))
/*
* Many ARM boot loaders pass arguments to loaded OS kernel
*/
#ifdef BSP_START_HOOKS_WITH_LOADER_ARGS
#define BSP_START_HOOKS_LOADER_ARGS int saved_psr, int saved_machid, int saved_dtb_adr
#else
#define BSP_START_HOOKS_LOADER_ARGS void
#endif
/**
* @brief System start entry.
*/
void _start(void);
/**
* @brief Start entry hook 0.
*
* This hook will be called from the start entry code after all modes and
* stack pointers are initialized but before the copying of the exception
* vectors.
*/
void bsp_start_hook_0(BSP_START_HOOKS_LOADER_ARGS);
/**
* @brief Start entry hook 1.
*
* This hook will be called from the start entry code after copying of the
* exception vectors but before the call to boot_card().
*/
void bsp_start_hook_1(BSP_START_HOOKS_LOADER_ARGS);
/**
* @brief Similar to standard memcpy().
*
* The memory areas must be word aligned. Copy code will be executed from the
* stack. If @a dest equals @a src nothing will be copied.
*/
void bsp_start_memcpy(int *dest, const int *src, size_t n);
/**
* @brief ARM entry point to bsp_start_memcpy().
*/
void bsp_start_memcpy_arm(int *dest, const int *src, size_t n);
/**
* @brief Copies all standard sections from the load to the runtime area.
*/
BSP_START_TEXT_SECTION static inline void bsp_start_copy_sections(void)
{
/* Copy .text section */
bsp_start_memcpy(
(int *) bsp_section_text_begin,
(const int *) bsp_section_text_load_begin,
(size_t) bsp_section_text_size
);
/* Copy .rodata section */
bsp_start_memcpy(
(int *) bsp_section_rodata_begin,
(const int *) bsp_section_rodata_load_begin,
(size_t) bsp_section_rodata_size
);
/* Copy .data section */
bsp_start_memcpy(
(int *) bsp_section_data_begin,
(const int *) bsp_section_data_load_begin,
(size_t) bsp_section_data_size
);
/* Copy .fast_text section */
bsp_start_memcpy(
(int *) bsp_section_fast_text_begin,
(const int *) bsp_section_fast_text_load_begin,
(size_t) bsp_section_fast_text_size
);
/* Copy .fast_data section */
bsp_start_memcpy(
(int *) bsp_section_fast_data_begin,
(const int *) bsp_section_fast_data_load_begin,
(size_t) bsp_section_fast_data_size
);
}
BSP_START_TEXT_SECTION static inline void
bsp_start_memcpy_libc(void *dest, const void *src, size_t n)
{
if (dest != src) {
memcpy(dest, src, n);
}
}
/**
* @brief Copies the .data, .fast_text and .fast_data sections from the load to
* the runtime area using the C library memcpy().
*
* Works only in case the .start, .text and .rodata sections reside in one
* memory region.
*/
BSP_START_TEXT_SECTION static inline void bsp_start_copy_sections_compact(void)
{
/* Copy .data section */
bsp_start_memcpy_libc(
bsp_section_data_begin,
bsp_section_data_load_begin,
(size_t) bsp_section_data_size
);
/* Copy .fast_text section */
bsp_start_memcpy_libc(
bsp_section_fast_text_begin,
bsp_section_fast_text_load_begin,
(size_t) bsp_section_fast_text_size
);
/* Copy .fast_data section */
bsp_start_memcpy_libc(
bsp_section_fast_data_begin,
bsp_section_fast_data_load_begin,
(size_t) bsp_section_fast_data_size
);
}
BSP_START_TEXT_SECTION static inline void bsp_start_clear_bss(void)
{
memset(bsp_section_bss_begin, 0, (size_t) bsp_section_bss_size);
}
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_SHARED_START_H */
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