started work on pmm

kernel/multiboot.h

@@ -0,0 +1,29 @@
+#ifndef KMULTIBOOT_H
+#define KMULTIBOOT_H
+
+#include <stdint.h>
+
+typedef struct  {
+    uint32_t flags;
+    uint32_t mem_lower;
+    uint32_t mem_upper;
+    uint32_t boot_device;
+    uint32_t cmdline;
+    uint32_t mods_count;
+    uint32_t mods_addr;
+    uint32_t num;
+    uint32_t size;
+    uint32_t addr;
+    uint32_t shndx;
+    uint32_t mmap_length;
+    uint32_t mmap_addr; 
+} multiboot_info;
+
+typedef struct __attribute__((packed)) {
+    uint32_t size;
+    uint64_t addr;  
+    uint64_t len;    
+    uint32_t type;
+} multiboot_mmap_entry;
+
+#endif