diff options
Diffstat (limited to 'cpu/i386/start.S')
| -rw-r--r-- | cpu/i386/start.S | 132 |
1 files changed, 15 insertions, 117 deletions
diff --git a/cpu/i386/start.S b/cpu/i386/start.S index 59089ef59..25d32e658 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 |