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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* 32-bit x86 Startup Code when running from SPL. This is the startup code in
* U-Boot proper, when SPL is used.
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <config.h>
.section .text.start
.code32
.globl _start
.type _start, @function
_start:
/*
* If running from coreboot, CAR is no-longer available. Use the
* existing stack, which is large enough.
*/
call locate_coreboot_table
cmp $0, %eax
jge use_existing_stack
movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %eax
#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %eax
#endif
jmp 2f
/*
* We don't subtract CONFIG_DCACHE_RAM_MRC_VAR_SIZE since memory is
* already set up. This has the happy side-effect of putting gd in a
* new place separate from SPL, so the memset() in
* board_init_f_init_reserve() does not cause any problems (otherwise
* it would zero out the gd and crash)
*/
/* Set up memory using the existing stack */
use_existing_stack:
mov %esp, %eax
2:
call board_init_f_alloc_reserve
mov %eax, %esp
call board_init_f_init_reserve
#ifdef CONFIG_DEBUG_UART
call debug_uart_init
#endif
call x86_cpu_reinit_f
xorl %eax, %eax
call board_init_f
call board_init_f_r
/* Should not return here */
jmp .
.globl board_init_f_r_trampoline
.type board_init_f_r_trampoline, @function
board_init_f_r_trampoline:
/*
* SPL has been executed and 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 */
movl %eax, %esp
/* Re-enter U-Boot by calling board_init_f_r() */
call board_init_f_r
die:
hlt
jmp die
hlt
.align 4
_dt_ucode_base_size:
/* These next two fields are filled in by binman */
.globl ucode_base
ucode_base: /* Declared in microcode.h */
.long 0 /* microcode base */
.globl ucode_size
ucode_size: /* Declared in microcode.h */
.long 0 /* microcode size */
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