From 65f10ab06b9918ee971ec14a3d18db9f27da99c9 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Thu, 24 Apr 2025 11:32:03 -0400
Subject: make 0x80 ring3, add kernel mem ctx switch in idt handler

---
 kernel/cpu/idt.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'kernel/cpu/idt.c')

diff --git a/kernel/cpu/idt.c b/kernel/cpu/idt.c
index bf4b499..8bddc21 100644
--- a/kernel/cpu/idt.c
+++ b/kernel/cpu/idt.c
@@ -3,6 +3,7 @@
 #include <comus/asm.h>
 #include <comus/cpu.h>
 #include <comus/drivers/pit.h>
+#include <comus/memory.h>
 
 #include "idt.h"
 #include "pic.h"
@@ -66,6 +67,9 @@ void idt_init(void)
 		entry->isr_mid = (isr >> 16) & 0xffff;
 		entry->isr_high = (isr >> 32) & 0xffffffff;
 		entry->reserved = 0;
+
+		if (vector == 0x80)
+			entry->flags |= RING3;
 	}
 
 	__asm__ volatile("lidt %0" : : "m"(idtr));
@@ -116,6 +120,9 @@ void idt_exception_handler(uint64_t exception, uint64_t code,
 {
 	uint64_t cr2;
 
+	// make sure were in the kernel memory context
+	mem_ctx_switch(kernel_mem_ctx);
+
 	switch (exception) {
 	case EX_PAGE_FAULT:
 		// page faults store the offending address in cr2
-- 
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