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https://xff.cz/git/u-boot/
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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>
48 lines
1004 B
ArmAsm
48 lines
1004 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* 64-bit x86 Startup Code
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*
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* Copyright 2019 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <config.h>
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.section .text.start
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.code64
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.globl _start
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.type _start, @function
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_start:
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/* Set up memory using the existing stack */
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mov %rsp, %rdi
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call board_init_f_alloc_reserve
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mov %rax, %rsp
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call board_init_f_init_reserve
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xor %rdi, %rdi
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call board_init_f
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call board_init_f_r
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/* Should not return here */
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jmp .
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.globl board_init_f_r_trampoline64
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.type board_init_f_r_trampoline64, @function
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board_init_f_r_trampoline64:
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/*
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* SDRAM has been initialised, U-Boot code has been copied into
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* RAM, BSS has been cleared and relocation adjustments have been
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* made. It is now time to jump into the in-RAM copy of U-Boot
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*
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* %eax = Address of top of new stack
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*/
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/* Stack grows down from top of SDRAM */
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movq %rsi, %rsp
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/* New gd is in rdi */
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/* Re-enter U-Boot by calling board_init_f_r() */
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call board_init_f_r
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