From 7a3e77c82dba79269b051d61a231a2cd88538b10 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <steffen.vogel@rwth-aachen.de>
Date: Wed, 20 Nov 2013 11:47:53 +0100
Subject: [PATCH] palloc()/pfree() replace our old kmalloc()/kfree() with
 PAGE_SIZE granularity

---
 include/metalsvm/stdlib.h | 52 +++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 29 deletions(-)

diff --git a/include/metalsvm/stdlib.h b/include/metalsvm/stdlib.h
index 1796fee0..9903c60f 100644
--- a/include/metalsvm/stdlib.h
+++ b/include/metalsvm/stdlib.h
@@ -29,9 +29,7 @@
 #ifndef __STDLIB_H__
 #define __STDLIB_H__
 
-#include <metalsvm/config.h>
-#include <metalsvm/tasks_types.h>
-#include <asm/stddef.h>
+#include <metalsvm/stddef.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -55,46 +53,42 @@ extern "C" {
 
 void NORETURN abort(void);
 
-/** @brief Kernel's memory allocator function.
+/** @brief General page allocator function
  *
- * This will just call mem_allocation with 
- * the flags MAP_KERNEL_SPACE and MAP_HEAP.
- *
- * @return Pointer to the new memory range
- */
-void* kmalloc(size_t);
-
-/** @brief Kernel's more general memory allocator function.
- *
- * This function lets you choose flags for the newly allocated memory.
+ * This function allocates and maps whole pages.
+ * To avoid fragmentation you should use kmalloc() and kfree()!
  *
  * @param sz Desired size of the new memory
- * @param flags Flags to specify
+ * @param flags Flags to for map_region(), vma_add()
  *
  * @return Pointer to the new memory range
  */
-void* mem_allocation(size_t sz, uint32_t flags);
+void* palloc(size_t sz, uint32_t flags);
 
-/** @brief Free memory
+/** @brief Free general kernel memory
  *
- * The kernel malloc doesn't track how 
- * much memory was allocated for which pointer,
+ * The pmalloc() doesn't track how much memory was allocated for which pointer,
  * so you have to specify how much memory shall be freed.
- */
-void kfree(void*, size_t);
-
-/** @brief Create a new stack for a new task
  *
- * @return start address of the new stack
+ * @param sz The size which should freed
  */
-void* create_stack(void);
+void pfree(void* addr, size_t sz);
 
-/** @brief Delete stack of a finished task
+/** @brief The memory allocator function
  *
- * @param addr Pointer to the stack  
- * @return 0 on success
+ * This allocator uses a buddy system to manage free memory.
+ *
+ * @return Pointer to the new memory range
  */
-int destroy_stack(task_t* addr);
+void* kmalloc(size_t sz);
+
+/** @brief The memory free function
+ *
+ * Releases memory allocated by malloc()
+ *
+ * @param addr The address to the memory block allocated by malloc()
+ */
+void kfree(void* addr);
 
 /** @brief String to long
  *