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Diffstat (limited to 'cpu/i386/start.S')
-rw-r--r--cpu/i386/start.S132
1 files changed, 15 insertions, 117 deletions
diff --git a/cpu/i386/start.S b/cpu/i386/start.S
index 59089ef..25d32e6 100644
--- a/cpu/i386/start.S
+++ b/cpu/i386/start.S
@@ -63,11 +63,8 @@ early_board_init_ret:
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 $CONFIG_SYS_STACK_SIZE, %ecx
+ /* Check we have enough memory for stack */
+ movl $CONFIG_SYS_STACK_SIZE, %ecx
cmpl %ecx, %eax
jae mem_ok
@@ -78,6 +75,8 @@ mem_init_ret:
.progress0a:
jmp die
mem_ok:
+ /* Set stack pointer to upper memory limit*/
+ movl %eax, %esp
/* indicate progress */
movw $0x02, %ax
@@ -85,12 +84,7 @@ mem_ok:
jmp show_boot_progress_asm
.progress1:
- /* create a stack after the bss */
- movl $_i386boot_bss_start, %eax
- addl $_i386boot_bss_size, %eax
- addl $CONFIG_SYS_STACK_SIZE, %eax
- movl %eax, %esp
-
+ /* Test the stack */
pushl $0
popl %eax
cmpl $0, %eax
@@ -116,115 +110,19 @@ stack_ok:
jmp show_boot_progress_asm
.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_asm
-.progress2a:
- jmp die
-
-data_ok:
-
- /* indicate progress */
- movw $0x04, %ax
- movl $.progress3, %ebp
- jmp show_boot_progress_asm
-.progress3:
-
- /* clear bss section in ram, size must be 4-byte aligned */
- movl $_i386boot_bss_start, %edi /* MK_CHG 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_asm
-.progress3a:
- jmp die
-
-bss_ok:
-#ifndef CONFIG_SKIP_RELOCATE_UBOOT
- /* indicate progress */
- movw $0x06, %ax
- movl $.progress6, %ebp
- jmp show_boot_progress_asm
-.progress6:
-
- /* copy text section to ram, size must be 4-byte aligned */
- movl $CONFIG_SYS_BL_START_RAM, %edi /* destination address */
- movl $TEXT_BASE, %esi /* source address */
- movl $_i386boot_text_size, %ecx /* number of bytes to copy */
- movl %ecx, %eax
- andl $3, %eax
- jz text_copy /* Already 4-byte aligned */
- subl $4, %eax /* Add extra bytes to size */
- addl %eax, %ecx
-text_copy:
- shrl $2, %ecx /* copy 4 byte each time */
- cld
- cmpl $0, %ecx
- je text_ok
-text_segment:
- movsl
- loop text_segment
- jmp text_ok
-text_fail:
- /* indicate (lack of) progress */
- movw $0x86, %ax
- movl $.progress5a, %ebp
- jmp show_boot_progress_asm
-.progress5a:
- jmp die
-
-text_ok:
-#endif
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_asm
-.progress4:
-
-#ifndef CONFIG_SKIP_RELOCATE_UBOOT
- /* Jump to the RAM copy of start_i386boot */
- movl $start_i386boot, %ebp
- addl $(CONFIG_SYS_BL_START_RAM - TEXT_BASE), %ebp
- call *%ebp /* Enter, U-boot! */
-#else
- call start_i386boot /* Enter, U-boot! */
-#endif
+ /* Create a Stack Frame */
+ pushl %ebp
+ movl %esp, %ebp
+
+ /* stack_limit parameter */
+ pushl %ecx
+ call board_init_f /* Enter, U-boot! */
/* indicate (lack of) progress */
movw $0x85, %ax