diff options
Diffstat (limited to 'roms/u-boot/arch/x86/cpu/start_from_spl.S')
| -rw-r--r-- | roms/u-boot/arch/x86/cpu/start_from_spl.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/start_from_spl.S b/roms/u-boot/arch/x86/cpu/start_from_spl.S new file mode 100644 index 000000000..abfd4abb6 --- /dev/null +++ b/roms/u-boot/arch/x86/cpu/start_from_spl.S @@ -0,0 +1,89 @@ +/* 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 */ |