# Running in *copy* of this code, somewhere in low 1MB.
- movb $0xa1, %al ; outb %al, $0x80
cli
cld
# setup data segment
cmpl $0x12345678, %eax
jne bogus_real_magic
- call verify_cpu # Verify the cpu supports long
- # mode
- testl %eax, %eax
- jnz no_longmode
-
testl $1, realmode_flags - wakeup_code
jz 1f
lcall $0xc000,$3
call mode_set
1:
- movw $0xb800, %ax
- movw %ax,%fs
- movw $0x0e00 + 'L', %fs:(0x10)
-
- movb $0xa2, %al ; outb %al, $0x80
-
mov %ds, %ax # Find 32bit wakeup_code addr
movzx %ax, %esi # (Convert %ds:gdt to a liner ptr)
shll $4, %esi
.code32
wakeup_32:
# Running in this code, but at low address; paging is not yet turned on.
- movb $0xa5, %al ; outb %al, $0x80
movl $__KERNEL_DS, %eax
movl %eax, %ds
- movw $0x0e00 + 'i', %ds:(0xb8012)
- movb $0xa8, %al ; outb %al, $0x80;
-
/*
* Prepare for entering 64bits mode
*/
*/
lgdt cpu_gdt_descr
- movw $0x0e00 + 'n', %ds:(0xb8014)
- movb $0xa9, %al ; outb %al, $0x80
-
movq saved_magic, %rax
movq $0x123456789abcdef0, %rdx
cmpq %rdx, %rax
jne bogus_64_magic
- movw $0x0e00 + 'u', %ds:(0xb8016)
-
nop
nop
movw $__KERNEL_DS, %ax
movw %ax, %gs
movq saved_rsp, %rsp
- movw $0x0e00 + 'x', %ds:(0xb8018)
movq saved_rbx, %rbx
movq saved_rdi, %rdi
movq saved_rsi, %rsi
movq saved_rbp, %rbp
- movw $0x0e00 + '!', %ds:(0xb801a)
movq saved_rip, %rax
jmp *%rax
.code16
bogus_real_magic:
- movb $0xba,%al ; outb %al,$0x80
jmp bogus_real_magic
.code64
bogus_64_magic:
- movb $0xb3,%al ; outb %al,$0x80
jmp bogus_64_magic
-.code16
-no_longmode:
- movb $0xbc,%al ; outb %al,$0x80
- jmp no_longmode
-
-#include "../verify_cpu_64.S"
-
/* This code uses an extended set of video mode numbers. These include:
* Aliases for standard modes
* NORMAL_VGA (-1)