#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;