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x86: Defer setup of final stack

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This commit is contained in:
Graeme Russ 2011-02-12 15:11:58 +11:00
parent 96cd66426a
commit fb0029088e
2 changed files with 33 additions and 17 deletions
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44
arch/i386/cpu/start.S
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@ -96,21 +96,6 @@ car_init_ret:
/* size memory */ /* size memory */
call dram_init_f call dram_init_f
/* Setup stack in SDRAM */
movl (GD_RAM_SIZE * 4)(%ebp), %esp
/* Test the stack */
pushl $0
popl %ecx
cmpl $0, %ecx
jne die
push $0x55aa55aa
popl %ecx
cmpl $0x55aa55aa, %ecx
jne die
wbinvd
/* Set parameter to board_init_f() to boot flags */ /* Set parameter to board_init_f() to boot flags */
movl (GD_FLAGS * 4)(%ebp), %eax movl (GD_FLAGS * 4)(%ebp), %eax
@ -118,6 +103,35 @@ car_init_ret:
/* indicate (lack of) progress */ /* indicate (lack of) progress */
movw $0x85, %ax movw $0x85, %ax
jmp die
.globl relocate_code
.type relocate_code, @function
relocate_code:
/*
* SDRAM has been initialised, U-Boot code has been copied into
* RAM, BSS has been cleared and relocation adjustments have been
* made. It is now time to jump into the in-RAM copy of U-Boot
*
* %eax = Address of top of stack
* %edx = Address of Global Data
* %ecx = Base address of in-RAM copy of U-Boot
*/
/* Setup stack in RAM */
movl %eax, %esp
/* Setup call address of in-RAM copy of board_init_r() */
movl $board_init_r, %ebp
subl (GD_RELOC_OFF * 4)(%edx), %ebp
/* Setup parameters to board_init_r() */
movl %edx, %eax
movl %ecx, %edx
/* Jump to in-RAM copy of board_init_r() */
call *%ebp
die: hlt die: hlt
jmp die jmp die
hlt hlt

6
arch/i386/lib/board.c
View File

@ -189,6 +189,7 @@ void board_init_f(ulong boot_flags)
ulong *src_addr; ulong *src_addr;
ulong *end_addr; ulong *end_addr;
void *addr_sp;
void *dest_addr; void *dest_addr;
ulong rel_offset; ulong rel_offset;
Elf32_Rel *re_src; Elf32_Rel *re_src;
@ -198,6 +199,7 @@ void board_init_f(ulong boot_flags)
/* Calculate destination RAM Address and relocation offset */ /* Calculate destination RAM Address and relocation offset */
dest_addr = (void *)gd->ram_size; dest_addr = (void *)gd->ram_size;
addr_sp = dest_addr;
dest_addr -= CONFIG_SYS_STACK_SIZE; dest_addr -= CONFIG_SYS_STACK_SIZE;
dest_addr -= (bss_end - text_start); dest_addr -= (bss_end - text_start);
rel_offset = text_start - dest_addr; rel_offset = text_start - dest_addr;
@ -242,9 +244,9 @@ void board_init_f(ulong boot_flags)
gd->flags |= GD_FLG_RELOC; gd->flags |= GD_FLG_RELOC;
/* Enter the relocated U-Boot! */ /* Enter the relocated U-Boot! */
(board_init_r - rel_offset)(gd, (ulong)dest_addr); relocate_code((ulong)addr_sp, gd, (ulong)dest_addr);
/* NOTREACHED - board_init_f() does not return */ /* NOTREACHED - relocate_code() does not return */
while(1); while(1);
} }