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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | /* 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: #ifdef CONFIG_X86_NO_REGPARM push %eax call board_init_f_alloc_reserve add $4, %esp mov %eax, %esp push %eax call board_init_f_init_reserve add $4, %esp #else call board_init_f_alloc_reserve mov %eax, %esp call board_init_f_init_reserve #endif #ifdef CONFIG_DEBUG_UART call debug_uart_init #endif call x86_cpu_reinit_f #ifdef CONFIG_X86_NO_REGPARM push $0 call board_init_f add $4, %esp #else xorl %eax, %eax call board_init_f #endif 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 (or 4(%esp) without regparm) */ /* Stack grows down from top of SDRAM */ #ifdef CONFIG_X86_NO_REGPARM movl 4(%esp), %eax #endif 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 */ |