Added basic paging.h & paging.c

kernel/include/bootloader.h

@@ -16,12 +16,13 @@
 #define BOOT_MMAP_NVS		4
 #define BOOT_MMAP_BADRAM	5
 
+#define BOOT_MAX_MMAP_ENTRIES	128
+
 // A memory map entry
 struct boot_memmap {
-	uint32_t skip;	// Used for skipping (may be padded for alignment)
 	uint64_t base;	// Memory region address
 	uint64_t size;	// Memory region length
-	uint32_t type;	// Memory region type
+	uint8_t  type;	// Memory region type
 } __packed;
 
 /*
@@ -39,7 +40,7 @@ struct boot_info {
 	uint8_t bootPart2;
 	uint8_t bootPart3;
 	char* cmdline;
-	uint32_t memmap;
+	struct boot_memmap* memmap;
 	size_t memmapLen;
 	char* bootname;
 } __packed;

kernel/include/paging.h

@@ -0,0 +1,25 @@
+#ifndef _PAGING_H
+#define _PAGING_H
+
+#include <kernel.h>
+
+#define PAGE_SIZE	4096
+
+#define PHYS_ADDR(_a)	((_a) & ~0xfff)
+
+#define PAGE_FLAG_PRESENT	(1 << 0)
+#define PAGE_FLAG_WRITE		(1 << 1)
+#define PAGE_FLAG_USER		(1 << 2)
+#define PAGE_FLAG_PWT		(1 << 3)
+#define PAGE_FLAG_NOCACHE	(1 << 4)
+#define PAGE_FLAG_ACCESSED	(1 << 5)
+#define PAGE_FLAG_DIRTY		(1 << 6)
+#define PAGE_FLAG_4MB		(1 << 7)
+#define PAGE_FLAG_GLOBAL	(1 << 8)
+
+// Defined in entry.s for initial paging
+extern uint32_t init_pagedir[1024];
+
+int pag_init(void);
+
+#endif