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Allow arch-specific setting of global_data in board_init_f_mem()

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At present we have a simple assignment to gd. With some archs this is
implemented as a register or through some other means; a simple assignment
does not suit in all cases.

Change this to a function and add documentation to describe how this all
works.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <yorksun@freescale.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2015-08-10 20:44:30 -06:00
parent 2afddae075
commit 1fed87db6a
2 changed files with 54 additions and 2 deletions
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13
common/board_f.c
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@@ -1027,16 +1027,25 @@ void board_init_f_r(void)
}
#endif /* CONFIG_X86 */
/* Unfortunately x86 can't compile this code as gd cannot be assigned */
#ifndef CONFIG_X86
__weak void arch_setup_gd(struct global_data *gd_ptr)
{
gd = gd_ptr;
}
ulong board_init_f_mem(ulong top)
{
struct global_data *gd_ptr;
/* Leave space for the stack we are running with now */
top -= 0x40;
top -= sizeof(struct global_data);
top = ALIGN(top, 16);
gd = (struct global_data *)top;
memset((void *)gd, '\0', sizeof(*gd));
gd_ptr = (struct global_data *)top;
memset(gd_ptr, '\0', sizeof(*gd));
arch_setup_gd(gd_ptr);
#ifdef CONFIG_SYS_MALLOC_F_LEN
top -= CONFIG_SYS_MALLOC_F_LEN;