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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
------------------------------------------- */
#ifndef __PARTITION_MAP_H__
#define __PARTITION_MAP_H__
#include <lib/boot.h>
/* @brief AMD64 magic for EPM */
#define EPM_MAGIC_X86 "EPMAM"
/* @brief RISC-V magic for EPM */
#define EPM_MAGIC_RV "EPMRV"
/* @brief ARM magic for EPM */
#define EPM_MAGIC_ARM "EPMAR"
/* @brief 64x0 magic for EPM */
#define EPM_MAGIC_64X0 "EPM64"
/* @brief 32x0 magic for EPM */
#define EPM_MAGIC_32X0 "EPM32"
/* @brief POWER magic for EPM */
#define EPM_MAGIC_PPC "EPMPC"
#ifdef __aarch64__
#define EPM_MAGIC EPM_MAGIC_ARM
#elif defined(__riscv64__)
#define EPM_MAGIC EPM_MAGIC_RV
#else
#define EPM_MAGIC "EPMMS" /* mass storage */
#endif
#define EPM_MAX_BLKS (128) /* 1 on UEFI EPM, because of it would only fit on a sector. */
/// @brief Size of a partition block (roughly 512 bytes)
#define EPM_PART_BLK_SZ sizeof(struct part_block)
/// @brief Start of EPM headers.
/// @note There could be anything before this LBA.
/// Such as PC specific structures.
#define EPM_PART_BLK_START (0)
/// @brief EPM revision (actually at version 2)
#define EPM_REVISION (2U)
/// @brief EPM GUID block.
typedef struct boot_guid {
uint32_t data1;
uint16_t data2;
uint16_t data3;
uint8_t data4[8];
} __attribute__((packed)) boot_guid_t;
/* The first 0 > 128 addresses of a disk contains these headers. */
/**
* @brief The EPM partition block.
* used to represent a partition inside a media.
*/
struct __attribute__((packed)) part_block {
ascii_char_t magic[5];
ascii_char_t name[32];
boot_guid_t uuid;
int32_t version;
int32_t num_blocks;
int64_t lba_start;
int64_t sector_sz;
int64_t lba_end;
int16_t type;
int32_t fs_version;
ascii_char_t fs[16]; /* ffs_2 */
ascii_char_t reserved[401];
};
typedef struct part_block part_block_t;
///! @brief variant enum.
///! use it in the boot block version field.
enum {
EPM_INVALID = 0x00,
EPM_GENERIC_OS = 0xcf,
EPM_LINUX = 0x8f,
EPM_BSD = 0x9f,
EPM_NEKERNEL_OS = 0x1f,
EPM_LEGACY_OS = 0x2f,
};
/// @brief check for supported filesystem.
boolean cb_filesystem_exists(caddr_t fs, size_t len);
/// @brief Parse EPM block from blob.
bool cb_parse_partition_block_data_at(voidptr_t blob, size_t blob_sz, size_t index, size_t* end_lba,
size_t* start_lba, size_t* sector_sz);
/// @brief Parse Partition block info at index.
/// @param index the partition block to parse.
part_block_t* cb_parse_partition_block_at(voidptr_t blob, size_t blob_sz, size_t index);
#endif // ifndef __PARTITION_MAP_H__
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