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