Reinitialize paging.

1 files changed, 26 insertions, 0 deletions

diff --git a/kernel/paging.c b/kernel/paging.c
new file mode 100644
index 0000000..22da7e8
--- /dev/null
+++ b/kernel/paging.c
@@ -0,0 +1,26 @@
+#include "paging.h"
+#include "kernel.h"
+
+#define invlpg(page) asm volatile("invlpg (%0)" :: "r" (page))
+
+void paging_reinit() {
+	map_p1.l[(uint32_t)&map_p2 >> 12] = (uint32_t)&entry_pagedir | P1_P | P1_W | P1_G;
+	
+	invlpg(&map_p2);
+	
+	for(unsigned int i = 0; i < 1024; i++) {
+		if(map_p2[i] & P2_P && !(map_p2[i] & P2_G)) {
+			map_p2[i] = 0;
+		}
+		
+		if(map_p1.b[0x300][i] & P1_P && !(map_p1.b[0x300][i] & P1_G)) {
+			map_p1.b[0x300][i] = 0;
+		}
+		
+		if(map_p1.b[0x3ff][i] & P1_P && !(map_p1.b[0x3ff][i] & P1_G)) {
+			map_p1.b[0x3ff][i] = 0;
+		}
+	}
+	
+	// TODO: Set CR4.PGE.
+}