Added bitmap_t type and bmap_* functions & used them in PMM

kernel/include/bitmap.h

@@ -0,0 +1,23 @@
+#ifndef _BITMAP_H
+#define _BITMAP_H
+
+#include <kernel.h>
+
+#define BLOCK_SIZE	4096
+#define BMAP_NOT_FOUND	((size_t)-1)
+
+typedef struct bitmap_t {
+	void* map;
+	size_t blocks;	// Eqiv. to # of bits
+	size_t bytes;	// ceil(blocks / 8)
+	size_t used;	// # of bits set to 0
+	int ready;
+} bitmap_t;
+
+void	bmap_set(bitmap_t* map, size_t bit, int val);
+int	bmap_get(bitmap_t* map, size_t bit);
+void	bmap_setarea(bitmap_t* map, size_t base, size_t len, int val);
+void	bmap_setall(bitmap_t* map, int val);
+size_t	bmap_findarea(bitmap_t* map, size_t len, int val);
+
+#endif

kernel/include/kernel.h

@@ -11,7 +11,9 @@
 #define USER_STACK	0xBF000000
 #define USER_SHARED	0xA0000000
 #define KERNEL_BASE	0xC0000000
-#define KERNEL_HEAP	0xD0000000
+#define KERNEL_SIZE	0x10000000
+#define KERNEL_MEM_BASE	0xD0000000
+#define KERNEL_MEM_SIZE	0x10000000
 #define KERNEL_SHARED	0xF0000000
 #define KERNEL_FRAMEBUF	0xC8000000
 

kernel/include/pmm.h

@@ -1,17 +1,15 @@
 #ifndef _PMM_H
 #define _PMM_H
 
-#include <multiboot.h>
+#include <bitmap.h>
+#include <kernel.h>
 
-#define PMM_BS	4096	// Block Size
-#define PMM_BPB	8	// Blocks per byte
-
-extern int pmm_ready;
+extern bitmap_t pmm_bitmap;
 
 int pmm_init(void);
 void pmm_initRegion(size_t base, size_t len);
 void pmm_deinitRegion(size_t base, size_t len);
-void* pmm_alloc(size_t blockCount);
-void pmm_free(void* ptr, size_t blockCount);
+void* pmm_alloc(size_t len);
+void pmm_free(void* ptr, size_t len);
 
 #endif