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kernel: add early init routines for app RAM

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Applications will have their own BSS and data sections which
will need to be additionally copied.

This covers the common C implementation of these functions.
Arches which implement their own optimized versions will need
to be updated.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-06-19 11:13:19 -07:00 • committed by Anas Nashif
commit bf5228ea56
2 changed files with 28 additions and 1 deletions
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21
include/linker/linker-defs.h
View file

@ -145,16 +145,35 @@ GDATA(__data_num_words)
#include <zephyr/types.h>
#ifdef CONFIG_APPLICATION_MEMORY
/* Application memory area bounds */
extern char __app_ram_start[];
extern char __app_ram_end[];
#endif
/* Memory owned by the kernel */
extern char __kernel_ram_start[];
extern char __kernel_ram_end[];
/* Used by _bss_zero or arch-specific implementation */
extern char __bss_start[];
extern char __bss_end[];
#ifdef CONFIG_APPLICATION_MEMORY
extern char __app_bss_start[];
extern char __app_bss_end[];
#endif
/* Used by _data_copy() or arch-specific implementation */
#ifdef CONFIG_XIP
extern char __data_rom_start[];
extern char __data_ram_start[];
extern char __data_ram_end[];
#endif
#ifdef CONFIG_APPLICATION_MEMORY
extern char __app_data_rom_start[];
extern char __app_data_ram_start[];
extern char __app_data_ram_end[];
#endif /* CONFIG_APPLICATION_MEMORY */
#endif /* CONFIG_XIP */
/* used by mem_safe subsystem */
extern char _image_rom_start[];

8
kernel/init.c
View file

@ -143,6 +143,10 @@ void _bss_zero(void)
{
memset(&__bss_start, 0,
((u32_t) &__bss_end - (u32_t) &__bss_start));
#ifdef CONFIG_APPLICATION_MEMORY
memset(&__app_bss_start, 0,
((u32_t) &__app_bss_end - (u32_t) &__app_bss_start));
#endif
}
@ -159,6 +163,10 @@ void _data_copy(void)
{
memcpy(&__data_ram_start, &__data_rom_start,
((u32_t) &__data_ram_end - (u32_t) &__data_ram_start));
#ifdef CONFIG_APPLICATION_MEMORY
memcpy(&__app_data_ram_start, &__app_data_rom_start,
((u32_t) &__app_data_ram_end - (u32_t) &__app_data_ram_start));
#endif
}
#endif