diff options
Diffstat (limited to 'cpu/i386/start.S')
| -rw-r--r-- | cpu/i386/start.S | 122 |
1 files changed, 60 insertions, 62 deletions
diff --git a/cpu/i386/start.S b/cpu/i386/start.S index 025555c..afcbb24 100644 --- a/cpu/i386/start.S +++ b/cpu/i386/start.S @@ -1,5 +1,5 @@ /* - * U-boot - i386 Startup Code + * U-boot - i386 Startup Code * * Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se> * @@ -26,71 +26,71 @@ #include <config.h> #include <version.h> - + .section .text .code32 .globl _start -.type _start, @function +.type _start, @function .globl _i386boot_start _i386boot_start: -_start: - movl $0x18,%eax /* Load our segement registes, the - * gdt have already been loaded by start16.S */ - movw %ax,%fs +_start: + movl $0x18,%eax /* Load our segement registes, the + * gdt have already been loaded by start16.S */ + movw %ax,%fs movw %ax,%ds - movw %ax,%gs - movw %ax,%es - movw %ax,%ss - + movw %ax,%gs + movw %ax,%es + movw %ax,%ss + /* We call a few functions in the board support package * since we have no stack yet we'll have to use %ebp * to store the return address */ - + /* Early platform init (setup gpio, etc ) */ mov $early_board_init_ret, %ebp jmp early_board_init early_board_init_ret: - + /* The __port80 entry-point should be usabe by now */ /* so we try to indicate progress */ - movw $0x01, %ax + movw $0x01, %ax movl $.progress0, %ebp jmp __show_boot_progress -.progress0: +.progress0: /* size memory */ mov $mem_init_ret, %ebp - jmp mem_init + jmp mem_init mem_init_ret: - - /* check ammount of configured memory - * (we need atleast bss start+bss size+stack size) */ + + /* check ammount of configured memory + * (we need atleast bss start+bss size+stack size) */ movl $_i386boot_bss_start, %ecx /* BSS start */ - addl $_i386boot_bss_size, %ecx /* BSS size */ + addl $_i386boot_bss_size, %ecx /* BSS size */ addl $CFG_STACK_SIZE, %ecx - cmpl %ecx, %eax + cmpl %ecx, %eax jae mem_ok - + /* indicate (lack of) progress */ - movw $0x81, %ax + movw $0x81, %ax movl $.progress0a, %ebp jmp __show_boot_progress -.progress0a: +.progress0a: jmp die -mem_ok: +mem_ok: /* indicate progress */ - movw $0x02, %ax + movw $0x02, %ax movl $.progress1, %ebp jmp __show_boot_progress -.progress1: +.progress1: /* create a stack after the bss */ - movl $_i386boot_bss_start, %eax + movl $_i386boot_bss_start, %eax addl $_i386boot_bss_size, %eax addl $CFG_STACK_SIZE, %eax - movl %eax, %esp - + movl %eax, %esp + pushl $0 popl %eax cmpl $0, %eax @@ -102,83 +102,83 @@ mem_ok: no_stack: /* indicate (lack of) progress */ - movw $0x82, %ax + movw $0x82, %ax movl $.progress1a, %ebp jmp __show_boot_progress -.progress1a: +.progress1a: jmp die - - -stack_ok: + + +stack_ok: /* indicate progress */ - movw $0x03, %ax + movw $0x03, %ax movl $.progress2, %ebp jmp __show_boot_progress -.progress2: +.progress2: /* copy data section to ram, size must be 4-byte aligned */ movl $_i386boot_romdata_dest, %edi /* destination address */ - movl $_i386boot_romdata_start, %esi /* source address */ + movl $_i386boot_romdata_start, %esi /* source address */ movl $_i386boot_romdata_size, %ecx /* number of bytes to copy */ movl %ecx, %eax andl $3, %eax jnz data_fail - + shrl $2, %ecx /* copy 4 byte each time */ - cld + cld cmpl $0, %ecx - je data_ok -data_segment: - movsl + je data_ok +data_segment: + movsl loop data_segment jmp data_ok data_fail: /* indicate (lack of) progress */ - movw $0x83, %ax + movw $0x83, %ax movl $.progress2a, %ebp jmp __show_boot_progress -.progress2a: +.progress2a: jmp die -data_ok: +data_ok: /* indicate progress */ - movw $0x04, %ax + movw $0x04, %ax movl $.progress3, %ebp jmp __show_boot_progress -.progress3: +.progress3: /* clear bss section in ram, size must be 4-byte aligned */ movl $_i386boot_bss_start, %eax /* BSS start */ - movl $_i386boot_bss_size, %ecx /* BSS size */ + movl $_i386boot_bss_size, %ecx /* BSS size */ movl %ecx, %eax andl $3, %eax jnz bss_fail shrl $2, %ecx /* clear 4 byte each time */ - cld + cld cmpl $0, %ecx - je bss_ok -bss: + je bss_ok +bss: movl $0, (%edi) - add $4, %edi + add $4, %edi loop bss jmp bss_ok bss_fail: /* indicate (lack of) progress */ - movw $0x84, %ax + movw $0x84, %ax movl $.progress3a, %ebp jmp __show_boot_progress -.progress3a: +.progress3a: jmp die -bss_ok: +bss_ok: - wbinvd + wbinvd /* indicate progress */ - movw $0x05, %ax + movw $0x05, %ax movl $.progress4, %ebp jmp __show_boot_progress .progress4: @@ -186,13 +186,11 @@ bss_ok: call start_i386boot /* Enter, U-boot! */ /* indicate (lack of) progress */ - movw $0x85, %ax + movw $0x85, %ax movl $.progress4a, %ebp jmp __show_boot_progress .progress4a: die: hlt jmp die - hlt - - + hlt |