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Update GDT pointer after unmapping GDT

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This commit is contained in:
Thomas Lovén 2017-12-18 23:23:08 +01:00
parent b5e0d749b8
commit 950de8645c
1 changed files with 19 additions and 1 deletions
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20
src/kernel/boot/boot.S
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@ -58,7 +58,7 @@ jmp 0x8:V2P(long_mode_start)
movabs rax, offset upper_memory movabs rax, offset upper_memory
jmp rax jmp rax
upper_memory: upper_memory:
//; Move stack pointer to kernel space //; Move stack pointer to kernel space
mov rax, KERNEL_OFFSET mov rax, KERNEL_OFFSET
@ -68,9 +68,27 @@ jmp 0x8:V2P(long_mode_start)
mov rax, 0 mov rax, 0
movabs [BootP4], rax movabs [BootP4], rax
//; Update page tables
mov rax, cr3 mov rax, cr3
mov cr3, rax mov cr3, rax
//; Reload GDT
movabs rax, offset BootGDTp
lgdt [rax]
mov rax, 0x0
mov ss, rax
mov ds, rax
mov es, rax
mov fs, rax
mov gs, rax
//; Reload CS
movabs rax, offset .reload_cs
pushq 0x8
push rax
retfq
.reload_cs:
//; Jump to kmain() //; Jump to kmain()
.extern kmain .extern kmain
movabs rax, offset kmain movabs rax, offset kmain