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interrupt: load GDT/IDT on the stack

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We have to use a separate Assembly function to do that, but maybe with some effort we can make that inline too
This commit is contained in:
Edgaru089
2021-10-14 15:51:50 +08:00
parent ebdc816d82
commit aa11d25fa8
4 changed files with 36 additions and 31 deletions
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29
interrupt/load_gdt.S
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@ -1,6 +1,8 @@
format elf64
public interrupt_ReloadSegments
public interrupt_LoadGDT
public interrupt_LoadIDT
section '.text' executable
@ -25,3 +27,30 @@ interrupt_ReloadSegments:
push rax
retfq
; sysvx64call void interrupt_LoadGDT(uint16_t length_sub1, void* base_ptr)
;
; Input: (uint16_t di, void* rsi)
; Clobbers: rax, flags
interrupt_LoadGDT:
mov rax, rsp ; save old RSP
sub rsp, 10
and rsp, 0xfffffffffffffffc ; align RSP to 4-byte
mov [rsp], di
mov [rsp+2], rsi
lgdt [rsp]
mov rsp, rax ; restore old RSP
ret
; sysvx64call void interrupt_LoadIDT(uint16_t length_sub1, void* base_ptr)
;
; Input: (uint16_t di, void* rsi)
; Clobbers: rax, flags
interrupt_LoadIDT:
mov rax, rsp ; save old RSP
sub rsp, 10
and rsp, 0xfffffffffffffffc ; align RSP to 4-byte
mov [rsp], di
mov [rsp+2], rsi
lidt [rsp]
mov rsp, rax ; restore old RSP
ret