handle interrupts

1 files changed, 55 insertions, 0 deletions

diff --git a/stage3/isr.lua b/stage3/isr.lua
new file mode 100644
index 0000000..6c81180
--- /dev/null
+++ b/stage3/isr.lua
@@ -0,0 +1,55 @@
+print("global idt_entries")
+print("extern interrupt_handler")
+
+local has_error_code = {}
+for _, x in pairs({8, 10, 11, 12, 13, 14, 17, 21, 29, 30}) do
+	has_error_code[x] = true
+end
+
+for i = 0, 255 do
+	print("isr_" .. i .. ":")
+	print("cli")
+
+	if not has_error_code[i] then
+		print("push 0")
+	end
+
+	print("push " .. i)
+	print("jmp isr_common")
+end
+
+print("idt_entries:")
+for i = 0, 255 do
+	print("dq isr_"..i)
+end
+
+print([[
+isr_common:
+	push   r11
+	push   r10
+	push   r9
+	push   r8
+	push   rdi
+	push   rsi
+	push   rcx
+	push   rdx
+	push   rax
+
+	cld
+	lea rdi, [rsp+8*9]
+	call interrupt_handler
+
+	pop    rax
+	pop    rdx
+	pop    rcx
+	pop    rsi
+	pop    rdi
+	pop    r8
+	pop    r9
+	pop    r10
+	pop    r11
+
+	add rsp, 16
+
+	iretq
+]])