From b450065984b1588966694579230dc40c802212e7 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 12 Apr 2024 14:03:29 +0200
Subject: Kernel/MMU: Dellocate pagedirectory when process exits.

---
 kernel/kmalloc.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'kernel/kmalloc.c')

diff --git a/kernel/kmalloc.c b/kernel/kmalloc.c
index 7138d61..59cc93d 100644
--- a/kernel/kmalloc.c
+++ b/kernel/kmalloc.c
@@ -2,12 +2,36 @@
 #include <kmalloc.h>
 #include <ksbrk.h>
 #include <math.h>
+#include <mmu.h>
 #include <random.h>
 #define NEW_ALLOC_SIZE 0x5000
 
 #define IS_FREE (1 << 0)
 #define IS_FINAL (1 << 1)
 
+void *kmalloc_align(size_t s, void **physical) {
+  // TODO: It should reuse virtual regions so that it does not run out
+  // of address space.
+  return ksbrk_physical(s, physical);
+}
+
+void kmalloc_align_free(void *p, size_t s) {
+  for (int i = 0; i < s; i += 0x1000) {
+    Page *page = get_page((char *)p + i, NULL, PAGE_NO_ALLOCATE, 0);
+    if (!page) {
+      continue;
+    }
+    if (!page->present) {
+      continue;
+    }
+    if (!page->frame) {
+      continue;
+    }
+    write_to_frame(((u32)page->frame) * 0x1000, 0);
+    page->present = 0;
+  }
+}
+
 typedef struct MallocHeader {
   u64 magic;
   u32 size;
-- 
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