Initial commit

interrupt/load_gdt.S

@@ -0,0 +1,45 @@
+format elf64
+
+public interrupt_ReloadSegments
+public interrupt_LoadGDT
+public interrupt_LoadIDT
+
+
+section '.text' executable
+
+; sysvx64call void interrupt_LoadGDT(void* gdtr)
+;
+; Input:    (void* rdi)
+; Clobbers: none
+interrupt_LoadGDT:
+	lgdt [rdi]
+	ret
+
+; sysvx64call void interrupt_ReloadSegments()
+;
+; Clobbers: rax
+interrupt_ReloadSegments:
+	mov eax, 0x10  ; my data segment
+	xor ax, ax
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov ss, ax
+
+	;jmp  0x08:.flush
+	; as in https://forum.osdev.org/viewtopic.php?f=1&t=30739
+	; farjump does not work in long mode, you need to do a far return:
+	pop  rax
+	push qword 0x08  ; my code segment
+	push rax
+	retfq
+
+; sysvx64call void interrupt_LoadIDT(void* idtr)
+;
+; Input:    (void* rdi)
+; Clobbers: none
+interrupt_LoadIDT:
+	lidt [rdi]
+	ret
+