From edca64134a9873f32379b2b83bd925ecca1c19b1 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sat, 12 Oct 2024 16:24:32 +0200
Subject: Kernel/MMU: Don't return non present pages unless creation is desired

`get_page` is a horrible multipurpose function and at this point I am
unsure what behavior I expect and have expected it to produce. Refactor
should probably be done soon.
---
 kernel/arch/i386/mmu.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'kernel/arch')

diff --git a/kernel/arch/i386/mmu.c b/kernel/arch/i386/mmu.c
index c38d834..a59eccf 100644
--- a/kernel/arch/i386/mmu.c
+++ b/kernel/arch/i386/mmu.c
@@ -127,6 +127,9 @@ Page *get_page(void *ptr, PageDirectory *directory, int create_new_page,
     }
   }
   Page *p = &directory->tables[table_index]->pages[address % 1024];
+  if (!p->present && !create_new_page) {
+    return 0;
+  }
   if (create_new_page) {
     p->present = 0;
     p->user = set_user;
-- 
cgit v1.2.3