2022-07-05 19:53:39 +03:00
|
|
|
bits 32
|
|
|
|
|
|
|
|
section .text
|
|
|
|
|
|
|
|
global limine_spinup_32
|
|
|
|
limine_spinup_32:
|
|
|
|
; Enable EFER.NXE
|
2022-09-02 04:31:22 +03:00
|
|
|
cmp dword [esp+32], 0 ; nx_available
|
|
|
|
je .no_nx
|
2022-07-05 19:53:39 +03:00
|
|
|
mov ecx, 0xc0000080
|
|
|
|
rdmsr
|
|
|
|
bts eax, 11
|
|
|
|
wrmsr
|
2022-09-02 04:31:22 +03:00
|
|
|
.no_nx:
|
2022-07-05 19:53:39 +03:00
|
|
|
|
|
|
|
; Enable CR4.LA57
|
|
|
|
cmp dword [esp+4], 0 ; level5pg
|
|
|
|
je .no_la57
|
|
|
|
mov eax, cr4
|
|
|
|
bts eax, 12
|
|
|
|
mov cr4, eax
|
|
|
|
.no_la57:
|
|
|
|
|
|
|
|
; Enable CR0.WP
|
|
|
|
mov eax, cr0
|
|
|
|
bts eax, 16
|
|
|
|
mov cr0, eax
|
|
|
|
|
|
|
|
cld
|
|
|
|
|
|
|
|
mov eax, [esp+8] ; pagemap_top_lv
|
|
|
|
mov cr3, eax
|
|
|
|
|
|
|
|
; Enable CR4.PAE
|
|
|
|
mov eax, cr4
|
|
|
|
bts eax, 5
|
|
|
|
mov cr4, eax
|
|
|
|
|
|
|
|
; Enable EFER.LME
|
2022-10-09 08:31:26 +03:00
|
|
|
mov ecx, 0xc0000080
|
2022-07-05 19:53:39 +03:00
|
|
|
rdmsr
|
|
|
|
bts eax, 8
|
|
|
|
wrmsr
|
|
|
|
|
|
|
|
; Enable CR0.PG
|
|
|
|
mov eax, cr0
|
|
|
|
bts eax, 31
|
|
|
|
mov cr0, eax
|
|
|
|
|
|
|
|
; Go 64
|
|
|
|
push 0x28
|
|
|
|
call .p1
|
|
|
|
.p1:
|
|
|
|
add dword [esp], .mode64 - .p1
|
|
|
|
retfd
|
|
|
|
|
|
|
|
bits 64
|
|
|
|
.mode64:
|
|
|
|
mov eax, 0x30
|
|
|
|
mov ds, eax
|
|
|
|
mov es, eax
|
|
|
|
mov fs, eax
|
|
|
|
mov gs, eax
|
|
|
|
mov ss, eax
|
|
|
|
|
|
|
|
; Load 64-bit GDT
|
|
|
|
mov eax, [rsp+28] ; local_gdt
|
|
|
|
lgdt [rax]
|
|
|
|
|
|
|
|
; Push fake return address
|
|
|
|
mov rsi, [rsp+20] ; stack
|
|
|
|
sub rsi, 8
|
|
|
|
mov qword [rsi], 0
|
|
|
|
|
|
|
|
; Prepare iretq frame
|
|
|
|
mov rax, qword [rsp+12] ; entry_point
|
|
|
|
push 0x30
|
|
|
|
push rsi
|
|
|
|
pushfq
|
|
|
|
push 0x28
|
|
|
|
push rax
|
|
|
|
|
|
|
|
; Zero out all GPRs
|
|
|
|
xor eax, eax
|
|
|
|
xor ebx, ebx
|
|
|
|
xor ecx, ecx
|
|
|
|
xor edx, edx
|
|
|
|
xor esi, esi
|
|
|
|
xor edi, edi
|
|
|
|
xor ebp, ebp
|
|
|
|
xor r8d, r8d
|
|
|
|
xor r9d, r9d
|
|
|
|
xor r10d, r10d
|
|
|
|
xor r11d, r11d
|
|
|
|
xor r12d, r12d
|
|
|
|
xor r13d, r13d
|
|
|
|
xor r14d, r14d
|
|
|
|
xor r15d, r15d
|
|
|
|
|
|
|
|
iretq
|