diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/arch/x86/cpu/start_from_tpl.S | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/arch/x86/cpu/start_from_tpl.S')
| -rw-r--r-- | roms/u-boot/arch/x86/cpu/start_from_tpl.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/start_from_tpl.S b/roms/u-boot/arch/x86/cpu/start_from_tpl.S new file mode 100644 index 000000000..9a4974a5f --- /dev/null +++ b/roms/u-boot/arch/x86/cpu/start_from_tpl.S @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * 32-bit x86 Startup Code when running from TPL. This is the startup code in + * SPL, when TPL 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: + /* Set up memory using the existing stack */ + mov %esp, %eax + call board_init_f_alloc_reserve + mov %eax, %esp + + call board_init_f_init_reserve + + 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: + /* + * TPL has been executed: SDRAM has been initialised, BSS has been + * cleared. + * + * %eax = Address of top of new stack + */ + + /* Stack grows down from top of SDRAM */ + movl %eax, %esp + + /* Re-enter SPL by calling board_init_f_r() */ + call board_init_f_r + +die: + hlt + jmp die + hlt |