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x86: Add a way to jump from TPL to SPL

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When TPL finishes it needs to jump to SPL with the stack set up correctly.
Add a function to handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-05-02 10:52:27 -06:00 committed by Bin Meng
parent 094ba7bb5b
commit 49dffb7a07
1 changed files with 13 additions and 0 deletions
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13
arch/x86/cpu/start.S
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@ -190,6 +190,19 @@ board_init_f_r_trampoline:
/* Re-enter U-Boot by calling board_init_f_r() */
call board_init_f_r
#ifdef CONFIG_TPL
.globl jump_to_spl
.type jump_to_spl, @function
jump_to_spl:
/* Reset stack to the top of CAR space */
movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp
#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp
#endif
jmp *%eax
#endif
die:
hlt
jmp die