mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 06:12:58 +00:00
8f015d3781
At present this leaves the stack at the pre-relocation value. This is not ideal since we want to have U-Boot running entirely from the top of memory. In addition, the new global_data pointer is not actually used, since the global_data pointer itself is relocated, then the pre-relocation value is changed, so the effective value (after relocation) does not update. Adjust the implementation to follow the 32-bit code more closely, with a trampoline function which is passed the new stack and global_data pointer. This ensures that the correct values come through even when relocating. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
47 lines
1,004 B
ArmAsm
47 lines
1,004 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* 64-bit x86 Startup Code
|
|
*
|
|
* Copyright 2019 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
.section .text.start
|
|
.code64
|
|
.globl _start
|
|
.type _start, @function
|
|
_start:
|
|
/* Set up memory using the existing stack */
|
|
mov %rsp, %rdi
|
|
call board_init_f_alloc_reserve
|
|
mov %rax, %rsp
|
|
|
|
call board_init_f_init_reserve
|
|
|
|
xor %rdi, %rdi
|
|
call board_init_f
|
|
call board_init_f_r
|
|
|
|
/* Should not return here */
|
|
jmp .
|
|
|
|
.globl board_init_f_r_trampoline64
|
|
.type board_init_f_r_trampoline64, @function
|
|
board_init_f_r_trampoline64:
|
|
/*
|
|
* 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 new stack
|
|
*/
|
|
|
|
/* Stack grows down from top of SDRAM */
|
|
movq %rsi, %rsp
|
|
|
|
/* New gd is in rdi */
|
|
|
|
/* Re-enter U-Boot by calling board_init_f_r() */
|
|
call board_init_f_r
|