diff options
Diffstat (limited to 'lib_i386/realmode_switch.S')
| -rw-r--r-- | lib_i386/realmode_switch.S | 60 |
1 files changed, 30 insertions, 30 deletions
diff --git a/lib_i386/realmode_switch.S b/lib_i386/realmode_switch.S index 0433cd47c7..d6c74ecd79 100644 --- a/lib_i386/realmode_switch.S +++ b/lib_i386/realmode_switch.S @@ -26,7 +26,7 @@ /* * Stack frame at 0xe00 - * e00 ebx; + * e00 ebx; * e04 ecx; * e08 edx; * e0c esi; @@ -56,13 +56,13 @@ realmode_enter: o32 pusha o32 pushf cli - sidt saved_idt - sgdt saved_gdt - movl %esp, %eax - movl %eax, saved_protected_mode_esp + sidt saved_idt + sgdt saved_gdt + movl %esp, %eax + movl %eax, saved_protected_mode_esp movl $0x10, %eax - movl %eax, %esp + movl %eax, %esp movw $0x28, %ax movw %ax, %ds movw %ax, %es @@ -70,10 +70,10 @@ o32 pushf movw %ax, %gs lidt realmode_idt_ptr - movl %cr0, %eax /* Go back into real mode by */ - andl $0x7ffffffe, %eax /* clearing PE to 0 */ + movl %cr0, %eax /* Go back into real mode by */ + andl $0x7ffffffe, %eax /* clearing PE to 0 */ movl %eax, %cr0 - ljmp $0x0,$do_realmode /* switch to real mode */ + ljmp $0x0,$do_realmode /* switch to real mode */ do_realmode: /* realmode code from here */ movw %cs,%ax @@ -115,20 +115,20 @@ o32 popf popw %ss movl %eax, %esp cs movl temp_eax, %eax - wbinvd /* self-modifying code, + wbinvd /* self-modifying code, * better flush the cache */ .byte 0x9a /* lcall */ temp_ip: - .word 0 /* new ip */ + .word 0 /* new ip */ temp_cs: - .word 0 /* new cs */ + .word 0 /* new cs */ realmode_ret: /* save eax, esp and ss */ cs movl %eax, saved_eax movl %esp, %eax cs movl %eax, saved_esp - movw %ss, %ax + movw %ss, %ax cs movw %ax, saved_ss /* restore the stack, note that we set sp to 0x244; @@ -170,26 +170,26 @@ cs movw temp_ip, %ax pushl %ebx o32 cs lidt saved_idt -o32 cs lgdt saved_gdt /* Set GDTR */ +o32 cs lgdt saved_gdt /* Set GDTR */ - movl %cr0, %eax /* Go back into protected mode */ - orl $1,%eax /* reset PE to 1 */ - movl %eax, %cr0 - jmp next_line /* flush prefetch queue */ + movl %cr0, %eax /* Go back into protected mode */ + orl $1,%eax /* reset PE to 1 */ + movl %eax, %cr0 + jmp next_line /* flush prefetch queue */ next_line: movw $return_ptr, %ax - movw %ax,%bp + movw %ax,%bp o32 cs ljmp *(%bp) .code32 protected_mode: - movl $0x18,%eax /* reload GDT[3] */ - movw %ax,%fs /* reset FS */ - movw %ax,%ds /* reset DS */ - movw %ax,%gs /* reset GS */ - movw %ax,%es /* reset ES */ - movw %ax,%ss /* reset SS */ - movl saved_protected_mode_esp, %eax + movl $0x18,%eax /* reload GDT[3] */ + movw %ax,%fs /* reset FS */ + movw %ax,%ds /* reset DS */ + movw %ax,%gs /* reset GS */ + movw %ax,%es /* reset ES */ + movw %ax,%ss /* reset SS */ + movl saved_protected_mode_esp, %eax movl %eax, %esp popf popa @@ -199,7 +199,7 @@ temp_eax: .long 0 saved_ss: - .word 0 + .word 0 saved_esp: .long 0 saved_eax: @@ -210,12 +210,12 @@ realmode_idt_ptr: .word 0x0, 0x0 saved_gdt: - .word 0, 0, 0, 0 + .word 0, 0, 0, 0 saved_idt: - .word 0, 0, 0, 0 + .word 0, 0, 0, 0 saved_protected_mode_esp: - .long 0 + .long 0 return_ptr: .long protected_mode |
