Bootable kernel skeleton

bootloader/x86/interrupts-x86_64.asm

@@ -0,0 +1,130 @@
+struc IDTEntry
+	.offsetl resw 1
+	.selector resw 1
+	.ist resb 1
+	.attribute resb 1
+	.offsetm resw 1
+	.offseth resd 1
+	.reserved resd 1
+endstruc
+
+SECTION .text
+USE64
+interrupts:
+.first:
+	mov [.entry], byte 0
+    jmp qword .handle
+.second:
+%assign i 1
+%rep 255
+	mov [.entry], byte i
+    jmp qword .handle
+%assign i i+1
+%endrep
+.handle:
+	push rbp
+	push r15
+	push r14
+	push r13
+	push r12
+	push r11
+	push r10
+	push r9
+	push r8
+	push rsi
+	push rdi
+	push rdx
+	push rcx
+	push rbx
+	push rax
+
+	mov rsi, rsp
+	push rsi
+	mov rdi, qword [.entry]
+	push rdi
+
+    mov rax, gdt.kernel_data
+    mov ds, rax
+    mov es, rax
+    mov fs, rax
+    mov gs, rax
+
+		call qword [.handler]
+
+	mov rax, gdt.user_data | 3
+    mov ds, rax
+    mov es, rax
+    mov gs, rax
+	mov rax, gdt.user_tls | 3
+    mov fs, rax
+
+	add rsp, 16 ; Skip interrupt code and reg pointer
+
+	pop rax
+	pop rbx
+	pop rcx
+	pop rdx
+	pop rdi
+	pop rsi
+	pop r8
+	pop r9
+	pop r10
+	pop r11
+	pop r12
+	pop r13
+	pop r14
+	pop r15
+	pop rbp
+
+    iretq
+
+.handler: dq 0
+.entry: dq 0
+
+idtr:
+    dw (idt.end - idt) + 1
+    dq idt
+
+idt:
+%assign i 0
+
+;Below syscall
+%rep 128
+	istruc IDTEntry
+		at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
+		at IDTEntry.selector, dw gdt.kernel_code
+		at IDTEntry.ist, db 0
+		at IDTEntry.attribute, db attrib.present | attrib.interrupt64
+		at IDTEntry.offsetm, dw 0
+		at IDTEntry.offseth, dd 0
+		at IDTEntry.reserved, dd 0
+	iend
+%assign i i+1
+%endrep
+
+;Syscall
+istruc IDTEntry
+	at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
+	at IDTEntry.selector, dw gdt.kernel_code
+	at IDTEntry.ist, db 0
+	at IDTEntry.attribute, db attrib.present | attrib.ring3 | attrib.interrupt64
+	at IDTEntry.offsetm, dw 0
+	at IDTEntry.offseth, dd 0
+	at IDTEntry.reserved, dd 0
+iend
+%assign i i+1
+
+;Above syscall
+%rep 127
+	istruc IDTEntry
+		at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
+		at IDTEntry.selector, dw gdt.kernel_code
+		at IDTEntry.ist, db 0
+		at IDTEntry.attribute, db attrib.present | attrib.interrupt64
+		at IDTEntry.offsetm, dw 0
+		at IDTEntry.offseth, dd 0
+		at IDTEntry.reserved, dd 0
+	iend
+%assign i i+1
+%endrep
+.end: