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/* ========================================
Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
======================================== */
/**
@brief The Explicit Partition Map scheme.
*/
#ifndef FIRMWAREKIT_EPM_H
#define FIRMWAREKIT_EPM_H
#include <NeKit/Defines.h>
#define kEPMNameLength (32)
#define kEPMFilesystemLength (16)
#define kEPMMagicLength (5)
/* @brief AMD64 magic for EPM */
#define kEPMMagic86 "EPMAM"
/* @brief RISC-V magic for EPM */
#define kEPMMagicRISCV "EPMRV"
/* @brief ARM magic for EPM */
#define kEPMMagicARM "EPMAR"
/* @brief 64x0 magic for EPM */
#define kEPMMagic64k "EPM64"
/* @brief 32x0 magic for EPM */
#define kEPMMagic32k "EPM32"
/* @brief POWER magic for EPM */
#define kEPMMagicPPC "EPMPC"
/* @brief Invalid magic for EPM */
#define kEPMMagicError "EPM??"
#ifdef __NE_AMD64__
#define kEPMMagic kEPMMagic86
#else
#ifdef __NE_ARM64__
#define kEPMMagic kEPMMagicARM
#else
#define kEPMMagic kEPMMagicError
#endif
#endif
///! @brief partition must start at this address.
///! Anything below is reserved for Data backup by the Main OS.
#define kEPMPartBlockLba (sizeof(EPM_PART_BLOCK))
///! @brief Current EPM revision.
#define kEPMRevisionBcd (0x0100)
/// !@brief EPM boot block address.
#define kEPMBootBlockLba (0U)
#define kEPMReserveLen (399)
struct EPM_GUID;
struct EPM_PART_BLOCK;
/* The first 0 > 128 addresses of a disk contains these headers. */
/// @brief EPM GUID structure.
typedef struct EPM_GUID {
Kernel::UInt32 Data1;
Kernel::UInt16 Data2;
Kernel::UInt16 Data3;
Kernel::UInt8 Data4[8];
} PACKED EPM_GUID;
/**
* @brief The EPM boot block.
* @note NumBlock and LbaStart are ignored on some platforms.
*/
struct PACKED EPM_PART_BLOCK {
Kernel::Char Magic[kEPMMagicLength];
Kernel::Char Name[kEPMNameLength];
EPM_GUID Guid;
Kernel::Int32 Version;
Kernel::Int64 NumBlocks;
Kernel::Int64 SectorSz;
Kernel::Int64 LbaStart; // base offset
Kernel::Int64 LbaEnd; // end offset
Kernel::Int16 Kind;
Kernel::Int16 Flags;
Kernel::Int32 FsVersion;
Kernel::Char Fs[kEPMFilesystemLength]; /* NeFS, OpenHeFS... */
Kernel::Char Reserved[kEPMReserveLen]; // to fill a full sector.
};
///! @brief Version kind enum.
///! @brief Use in boot block version field.
enum {
kEPMInvalid = 0x00,
kEPMGeneric = 0xcf, /// @brief Generic OS
kEPMLinux = 0x8f, /// @brief Linux on EPM.
kEPMBSD = 0x9f, /// @brief BSD on EPM.
kEPMNeKernel = 0x1f, /// @brief NeKernel.
kEPMLegacy = 0x2f, /// @brief Legacy VMKernel.
/// @note ... the rest is reserved for future OSes.
kEPMInvalidOS = 0xff,
};
inline EPM_GUID kEPMNilGuid = {0x0U, 0x0U, 0x0U, {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
#endif // ifndef FIRMWAREKIT_EPM_H
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