From 0e62049711f043d9b0d87ee137cf8c50a1cf3fa2 Mon Sep 17 00:00:00 2001
From: Amoelle <amoelle@proton.me>
Date: Sun, 27 Jul 2025 11:23:29 +0300
Subject: [PATCH] mapping pages

---
 kernel.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/kernel.c b/kernel.c
index a5a1255..95561fe 100644
--- a/kernel.c
+++ b/kernel.c
@@ -1,5 +1,6 @@
 #include "kernel.h"
 #include "common.h"
+#include <sys/types.h>
 
 extern char __bss[], __bss_end[], __stack_top[];
 extern char __free_ram[], __free_ram_end[];
@@ -265,6 +266,26 @@ void proc_b_entry(void) {
     }
 }
 
+void map_page(uint32_t *table1, uint32_t vaddr, paddr_t paddr, uint32_t flags) {
+    if (!is_aligned(vaddr, PAGE_SIZE))
+        PANIC("Unaligned vaddr %x", vaddr);
+
+    if (!is_aligned(paddr, PAGE_SIZE))
+        PANIC("Unaligned paddr %x", paddr);
+
+    uint32_t vpn1 = (vaddr >> 22) & 0x3ff;
+    if ((table1[vpn1] & PAGE_V) == 0) {
+        // Create the first level page
+        uint32_t pt_paddr = alloc_pages(1);
+        table1[vpn1] = ((pt_paddr / PAGE_SIZE) << 10) | PAGE_V;
+    }
+    
+    // Set the second level page table entry to map the physical page
+    uint32_t vpn0 = (vaddr >> 12) & 0x3ff;
+    uint32_t *table0 = (uint32_t *) ((table1[vpn1] >> 10) * PAGE_SIZE);
+    table0[vpn0] = ((paddr / PAGE_SIZE) << 10) | flags | PAGE_V;
+}
+
 void kernel_main(void) {
     // printf("\n\nHello %s\n", "friend :3");
     // printf("60 + 9 = %d, %x\n", 60 + 9, 0x1234abcd);