RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-28 16:27:36 +00:00
Code Issues Activity Actions

Kernel: Set an appropriate GDT for 64-bit mode

Browse source
This commit is contained in:
Gunnar Beutner 2021-06-24 13:04:41 +02:00 • committed by Andreas Kling
parent d84abe51f5
commit 4c555684b7
1 changed files with 19 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

20
Kernel/Arch/x86/x86_64/Boot/boot.S
View file

@ -87,6 +87,16 @@ the 9 page tables each contain 512 pte's that map individual 4KB pages
*/ */
gdt64:
.quad 0
gdt64code:
.quad (1<<43) | (1<<44) | (1<<47) | (1<<53) /* executable, code segment, present, 64-bit */
gdt64ptr:
.short . - gdt64 - 1
.quad gdt64
.set code64_sel, gdt64code - gdt64
start: start:
cli cli
cld cld
@ -250,8 +260,13 @@ start:
addl $0xc0000000, %ebx addl $0xc0000000, %ebx
movl %ebx, multiboot_info_ptr movl %ebx, multiboot_info_ptr
lgdt gdt64ptr
ljmpl $code64_sel, $1f
.code64
1:
call init call init
add $4, %esp add $4, %rsp
cli cli
loop: loop:
@ -319,7 +334,8 @@ apic_ap_start32:
movl $0x80000001, %eax movl $0x80000001, %eax
cpuid cpuid
testl $0x100000, %edx testl $0x100000, %edx
je (1f - apic_ap_start + 0x8000) // TODO: Uncomment this
//je (1f - apic_ap_start + 0x8000)
/* turn on IA32_EFER.NXE */ /* turn on IA32_EFER.NXE */
movl $0xc0000080, %ecx movl $0xc0000080, %ecx
rdmsr rdmsr