ZealOS/zealbooter/trampoline.S

39 lines
517 B
ArmAsm

.section .text
.global trampoline
trampoline:
mov $0x6000, %esp
lgdt (%rcx)
pushq $0x30
addq $(1f - trampoline), %rax
pushq %rax
lretq
.code32
1:
mov $0x10, %eax
mov %eax, %ds
mov %eax, %es
mov %eax, %fs
mov %eax, %gs
mov %eax, %ss
mov %cr0, %eax
btr $31, %eax
mov %eax, %cr0
mov $0xc0000080, %ecx
xor %eax, %eax
xor %edx, %edx
wrmsr
mov %ebx, %eax
mov $2, %ebx
jmp *%eax
.global trampoline_end
trampoline_end: