i think it works

code/kernel/memory_map.h

@@ -0,0 +1,30 @@
+#pragma once
+// memory_map.h  - shared between bootx64.efi and kernel.exe
+// Describes physical memory layout passed from bootloader to kernel.
+#include <stdint.h>
+
+#define MEMORY_MAP_MAGIC    0x4D454D4D41500000ULL   /* 'MEMMAP\0\0' */
+#define MEMORY_MAX_REGIONS  256
+
+typedef enum MEMORY_TYPE {
+    MemoryUsable          = 0,   /* free RAM, available to the PMM      */
+    MemoryReserved        = 1,   /* firmware-reserved, do not touch     */
+    MemoryMappedIO        = 2,   /* device MMIO regions                 */
+    MemoryFramebuffer     = 3,   /* GOP framebuffer                     */
+    MemoryBootloader      = 4,   /* bootloader code/data (reclaimable)  */
+    MemoryKernel          = 5,   /* kernel + HAL + drivers image pages  */
+} MEMORY_TYPE;
+
+typedef struct MEMORY_REGION {
+    uint64_t    Base;
+    uint64_t    Length;          /* in bytes, always page-aligned       */
+    MEMORY_TYPE Type;
+    uint32_t    _pad;
+} MEMORY_REGION;
+
+typedef struct MEMORY_MAP {
+    uint64_t       Magic;
+    uint32_t       RegionCount;
+    uint32_t       _pad;
+    MEMORY_REGION  Regions[MEMORY_MAX_REGIONS];
+} MEMORY_MAP;