diff --git a/src/kernel/memory/kbrk.c b/src/kernel/memory/kbrk.c
index d56ee55..ca38f4f 100644
--- a/src/kernel/memory/kbrk.c
+++ b/src/kernel/memory/kbrk.c
@@ -1,5 +1,7 @@
 #include <memory.h>
 #include <debug.h>
+#include <sys/mman.h>
+#include <string.h>
 
 static long _brk = KERNEL_BRK0;
 static long _mmap = KERNEL_MMAP;
@@ -33,14 +35,22 @@ long k_mmap(
 
   if(fd != -1)
     PANIC("Unknown mmap request\n");
-  long retval = _mmap;
-  while(length > 0) {
+  long pos = (flags & MAP_FIXED) ? addr : _mmap;
+  long retval = pos;
+  uint64_t p;
+  while(length >= 0) {
+    p = pmm_alloc();
     vmm_set_page(kernel_P4,
-        _mmap, pmm_alloc(),
+        pos, p,
         PAGE_GLOBAL | PAGE_WRITE | PAGE_PRESENT
     );
-    _mmap += PAGE_SIZE;
+    if(flags & MAP_ANONYMOUS) {
+      memset((void *)pos, 0, PAGE_SIZE);
+    }
+    pos += PAGE_SIZE;
     length -= PAGE_SIZE;
   }
+  if(!(flags & MAP_FIXED))
+    _mmap = pos;
   return retval;
 }
\ No newline at end of file