kernel: x86-64 idt

kernel-src/arch/x86-64/isr.asm

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+section .text
+%assign i 0
+%rep 256
+isr_%+ i:
+	; push an error code if the cpu did not
+	%if (i == 8 || i == 10 || i == 11 || i == 12 || i == 13 || i == 14) == 0
+		push qword 0
+	%endif
+
+	; check if swapgs is needed
+
+	cmp qword [rsp+16], 0x18
+	jne .notneeded1
+	swapgs
+	.notneeded1:
+
+	; push context
+	push rsi
+	push rdi
+	push r15
+	push r14
+	push r13
+	push r12
+	push r11
+	push r10
+	push r9
+	push r8
+	push rdx
+	push rcx
+	push rbx
+	push rax
+	mov rax, ds
+	push rax
+	mov rax, es
+	push rax
+	mov rax, fs
+	push rax
+	mov rax, gs
+	push rax	
+	mov rdi,cr2
+	push rdi
+
+	; save ctx pointer and interrupt vector number
+	mov rdi, i
+	mov rsi, rsp
+
+	cld
+	extern interrupt_isr
+	call interrupt_isr
+
+	; pop context
+	add rsp, 24 ; cr2 gs and fs are not popped.
+	pop rax
+	mov es,rax
+	pop rax
+	mov ds,rax
+	pop rax
+	pop rbx
+	pop rcx
+	pop rdx
+	pop r8
+	pop r9
+	pop r10
+	pop r11
+	pop r12
+	pop r13
+	pop r14
+	pop r15
+	pop rdi
+	pop rsi
+	pop rbp
+	add rsp,8 ; remove error code
+
+	; check if swapgs is needed
+	cmp qword [rsp+8], 0x18
+	jne .notneeded2
+	swapgs
+	.notneeded2:
+	iret
+%assign i i+1
+%endrep
+
+section .rodata
+global isr_table
+isr_table:
+	%assign i 0
+	%rep 256
+	dq isr_%+ i
+	%endrep