/*
- * U-boot - i386 Startup Code
+ * U-boot - i386 Startup Code
*
* Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
*
#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:
+ jmp show_boot_progress_asm
+.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) */
- movl $_i386boot_bss_start, %ecx /* BSS start */
- addl $_i386boot_bss_size, %ecx /* BSS size */
- addl $CFG_STACK_SIZE, %ecx
- cmpl %ecx, %eax
+
+ /* Check we have enough memory for stack */
+ movl $CONFIG_SYS_STACK_SIZE, %ecx
+ cmpl %ecx, %eax
jae mem_ok
-
+
/* indicate (lack of) progress */
- movw $0x81, %ax
+ movw $0x81, %ax
movl $.progress0a, %ebp
- jmp __show_boot_progress
-.progress0a:
- jmp die
-mem_ok:
+ jmp show_boot_progress_asm
+.progress0a:
+ jmp die
+mem_ok:
+ /* Set stack pointer to upper memory limit*/
+ movl %eax, %esp
/* indicate progress */
- movw $0x02, %ax
+ movw $0x02, %ax
movl $.progress1, %ebp
- jmp __show_boot_progress
-.progress1:
-
- /* create a stack after the bss */
- movl $_i386boot_bss_start, %eax
- addl $_i386boot_bss_size, %eax
- addl $CFG_STACK_SIZE, %eax
- movl %eax, %esp
-
+ jmp show_boot_progress_asm
+.progress1:
+
+ /* Test the stack */
pushl $0
popl %eax
cmpl $0, %eax
no_stack:
/* indicate (lack of) progress */
- movw $0x82, %ax
+ movw $0x82, %ax
movl $.progress1a, %ebp
- jmp __show_boot_progress
-.progress1a:
+ jmp show_boot_progress_asm
+.progress1a:
jmp die
-
-
-stack_ok:
- /* indicate progress */
- movw $0x03, %ax
- movl $.progress2, %ebp
- jmp __show_boot_progress
-.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_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
- cmpl $0, %ecx
- je data_ok
-data_segment:
- movsl
- loop data_segment
- jmp data_ok
-data_fail:
- /* indicate (lack of) progress */
- movw $0x83, %ax
- movl $.progress2a, %ebp
- jmp __show_boot_progress
-.progress2a:
- jmp die
-data_ok:
+stack_ok:
/* indicate progress */
- movw $0x04, %ax
- movl $.progress3, %ebp
- jmp __show_boot_progress
-.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 %ecx, %eax
- andl $3, %eax
- jnz bss_fail
- shrl $2, %ecx /* clear 4 byte each time */
- cld
- cmpl $0, %ecx
- je bss_ok
-bss:
- movl $0, (%edi)
- add $4, %edi
- loop bss
- jmp bss_ok
-
-bss_fail:
- /* indicate (lack of) progress */
- movw $0x84, %ax
- movl $.progress3a, %ebp
- jmp __show_boot_progress
-.progress3a:
- jmp die
-
-bss_ok:
+ movw $0x03, %ax
+ movl $.progress2, %ebp
+ jmp show_boot_progress_asm
+.progress2:
- wbinvd
+ wbinvd
+ /* Get upper memory limit */
+ movl %esp, %ecx
+ subl $CONFIG_SYS_STACK_SIZE, %ecx
- /* indicate progress */
- movw $0x05, %ax
- movl $.progress4, %ebp
- jmp __show_boot_progress
-.progress4:
+ /* Create a Stack Frame */
+ pushl %ebp
+ movl %esp, %ebp
- call start_i386boot /* Enter, U-boot! */
+ /* stack_limit parameter */
+ pushl %ecx
+ call board_init_f /* Enter, U-boot! */
/* indicate (lack of) progress */
- movw $0x85, %ax
+ movw $0x85, %ax
movl $.progress4a, %ebp
- jmp __show_boot_progress
+ jmp show_boot_progress_asm
.progress4a:
die: hlt
jmp die
- hlt
-
-
+ hlt
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