From 04b4c029420b010a906d0af3fb7b52108471c4bd Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 21 Jul 2021 18:02:53 +0200
Subject: create ISR stubs, which call a single main isr handler

quick explaination of how this even works:
The `call` in each stub pushes its own address onto the stack before
calling stage2. We can substract the address of the 0th ISR to get the
offset, which we then divide by the size of each stub to get the index.
---
 src/kernel/arch/i386/interrupts/idt.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'src/kernel/arch/i386/interrupts/idt.c')

diff --git a/src/kernel/arch/i386/interrupts/idt.c b/src/kernel/arch/i386/interrupts/idt.c
index bbaf610..4c46514 100644
--- a/src/kernel/arch/i386/interrupts/idt.c
+++ b/src/kernel/arch/i386/interrupts/idt.c
@@ -27,14 +27,14 @@ struct lidt_arg {
 static struct idt_entry IDT[256];
 static struct lidt_arg lidt_arg;
 
-static inline void idt_add(uint8_t num, bool user, void (*isr));
+static inline void idt_add(uint8_t num, bool user);
 static void idt_prepare();
 static void idt_load();
 static void idt_test();
 
 
-static inline void idt_add(uint8_t num, bool user, void (*isr)) {
-	uintptr_t offset = (uintptr_t) isr;
+static inline void idt_add(uint8_t num, bool user) {
+	uintptr_t offset = (uintptr_t) &_isr_stubs + 8 * num;
 
 	IDT[num] = (struct idt_entry) {
 		.offset_low  = offset,
@@ -52,10 +52,10 @@ static void idt_prepare() {
 	for (int i = 0; i < 256; i++)
 		IDT[i].present = 0;
 
-	idt_add(0x08, false, isr_double_fault);
-	idt_add(0x0d, false, isr_general_protection_fault);
-	idt_add(0x0e, false, isr_page_fault);
-	idt_add(0x34, false, isr_test_interrupt);
+	idt_add(0x08, false);
+	idt_add(0x0d, false);
+	idt_add(0x0e, false);
+	idt_add(0x34, false);
 }
 
 static void idt_load() {
-- 
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