mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 13:56:30 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
188 lines
4.3 KiB
ArmAsm
188 lines
4.3 KiB
ArmAsm
/*
|
|
* U-boot - x86 Startup Code
|
|
*
|
|
* (C) Copyright 2008-2011
|
|
* Graeme Russ, <graeme.russ@gmail.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <version.h>
|
|
#include <asm/global_data.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/processor-flags.h>
|
|
#include <generated/generic-asm-offsets.h>
|
|
|
|
.section .text
|
|
.code32
|
|
.globl _start
|
|
.type _start, @function
|
|
.globl _x86boot_start
|
|
_x86boot_start:
|
|
/*
|
|
* This is the fail safe 32-bit bootstrap entry point. The
|
|
* following code is not executed from a cold-reset (actually, a
|
|
* lot of it is, but from real-mode after cold reset. It is
|
|
* repeated here to put the board into a state as close to cold
|
|
* reset as necessary)
|
|
*/
|
|
cli
|
|
cld
|
|
|
|
/* Turn off cache (this might require a 486-class CPU) */
|
|
movl %cr0, %eax
|
|
orl $(X86_CR0_NW | X86_CR0_CD), %eax
|
|
movl %eax, %cr0
|
|
wbinvd
|
|
|
|
/* Tell 32-bit code it is being entered from an in-RAM copy */
|
|
movw $GD_FLG_WARM_BOOT, %bx
|
|
jmp 1f
|
|
_start:
|
|
/*
|
|
* This is the 32-bit cold-reset entry point. Initialize %bx to 0
|
|
* in case we're preceeded by some sort of boot stub.
|
|
*/
|
|
movw $GD_FLG_COLD_BOOT, %bx
|
|
1:
|
|
|
|
/* Load the segement registes to match the gdt loaded in start16.S */
|
|
movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
|
|
movw %ax, %fs
|
|
movw %ax, %ds
|
|
movw %ax, %gs
|
|
movw %ax, %es
|
|
movw %ax, %ss
|
|
|
|
/* Clear the interrupt vectors */
|
|
lidt blank_idt_ptr
|
|
|
|
/* Early platform init (setup gpio, etc ) */
|
|
jmp early_board_init
|
|
.globl early_board_init_ret
|
|
early_board_init_ret:
|
|
|
|
/* Initialise Cache-As-RAM */
|
|
jmp car_init
|
|
.globl car_init_ret
|
|
car_init_ret:
|
|
/*
|
|
* We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM,
|
|
* or fully initialised SDRAM - we really don't care which)
|
|
* starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack
|
|
*/
|
|
|
|
/* Stack grows down from top of CAR */
|
|
movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE), %esp
|
|
|
|
/* Reserve space on stack for global data */
|
|
subl $GENERATED_GBL_DATA_SIZE, %esp
|
|
|
|
/* Align global data to 16-byte boundary */
|
|
andl $0xfffffff0, %esp
|
|
|
|
/* Setup first parameter to setup_gdt */
|
|
movl %esp, %eax
|
|
|
|
/* Reserve space for global descriptor table */
|
|
subl $X86_GDT_SIZE, %esp
|
|
|
|
/* Align temporary global descriptor table to 16-byte boundary */
|
|
andl $0xfffffff0, %esp
|
|
|
|
/* Set second parameter to setup_gdt */
|
|
movl %esp, %edx
|
|
|
|
/* Setup global descriptor table so gd->xyz works */
|
|
call setup_gdt
|
|
|
|
/* Set parameter to board_init_f() to boot flags */
|
|
xorl %eax, %eax
|
|
movw %bx, %ax
|
|
|
|
/* Enter, U-boot! */
|
|
call board_init_f
|
|
|
|
/* indicate (lack of) progress */
|
|
movw $0x85, %ax
|
|
jmp die
|
|
|
|
.globl board_init_f_r_trampoline
|
|
.type board_init_f_r_trampoline, @function
|
|
board_init_f_r_trampoline:
|
|
/*
|
|
* 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
|
|
|
|
/* Reserve space on stack for global data */
|
|
subl $GENERATED_GBL_DATA_SIZE, %esp
|
|
|
|
/* Align global data to 16-byte boundary */
|
|
andl $0xfffffff0, %esp
|
|
|
|
/* Setup first parameter to memcpy (and setup_gdt) */
|
|
movl %esp, %eax
|
|
|
|
/* Setup second parameter to memcpy */
|
|
fs movl 0, %edx
|
|
|
|
/* Set third parameter to memcpy */
|
|
movl $GENERATED_GBL_DATA_SIZE, %ecx
|
|
|
|
/* Copy global data from CAR to SDRAM stack */
|
|
call memcpy
|
|
|
|
/* Reserve space for global descriptor table */
|
|
subl $X86_GDT_SIZE, %esp
|
|
|
|
/* Align global descriptor table to 16-byte boundary */
|
|
andl $0xfffffff0, %esp
|
|
|
|
/* Set second parameter to setup_gdt */
|
|
movl %esp, %edx
|
|
|
|
/* Setup global descriptor table so gd->xyz works */
|
|
call setup_gdt
|
|
|
|
/* Re-enter U-Boot by calling board_init_f_r */
|
|
call board_init_f_r
|
|
|
|
die:
|
|
hlt
|
|
jmp die
|
|
hlt
|
|
|
|
blank_idt_ptr:
|
|
.word 0 /* limit */
|
|
.long 0 /* base */
|
|
|
|
.p2align 2 /* force 4-byte alignment */
|
|
|
|
multiboot_header:
|
|
/* magic */
|
|
.long 0x1BADB002
|
|
/* flags */
|
|
.long (1 << 16)
|
|
/* checksum */
|
|
.long -0x1BADB002 - (1 << 16)
|
|
/* header addr */
|
|
.long multiboot_header - _x86boot_start + CONFIG_SYS_TEXT_BASE
|
|
/* load addr */
|
|
.long CONFIG_SYS_TEXT_BASE
|
|
/* load end addr */
|
|
.long 0
|
|
/* bss end addr */
|
|
.long 0
|
|
/* entry addr */
|
|
.long CONFIG_SYS_TEXT_BASE
|