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277 lines
6.4 KiB
277 lines
6.4 KiB
10 months ago
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// Copyright (C) 2003, Matt Conover (mconover@gmail.com)
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#ifndef CPU_H
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#define CPU_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#pragma pack(push,1)
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#include <windows.h>
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#include "misc.h"
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////////////////////////////////////////////////////////
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// System descriptors
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////////////////////////////////////////////////////////
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#define GDT_NULL 0
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#define GDT_R0_CODE 0x08
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#define GDT_R0_DATA 0x10
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#define GDT_R3_CODE 0x18
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#define GDT_R3_DATA 0x20
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#define GDT_TSS 0x28
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#define GDT_PCR 0x30
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#define GDT_R3_TEB 0x38
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#define GDT_VDM 0x40
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#define GDT_LDT 0x48
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#define GDT_DOUBLEFAULT_TSS 0x50
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#define GDT_NMI_TSS 0x58
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// 16-bit GDT entries:
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// TODO: #define GDT_ABIOS_UNKNOWN 0x60 (22F30-32F2F)
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#define GDT_ABIOS_VIDEO 0x68
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#define GDT_ABIOS_GDT 0x70 // descriptor describing ABIOS GDT itself
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#define GDT_ABIOS_NTOS 0x78 // first 64K of NTOSKRNL
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#define GDT_ABIOS_CDA 0xE8 // common data area
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#define GDT_ABIOS_CODE 0xF0 // KiI386AbiosCall
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#define GDT_ABIOS_STACK 0xF8
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#define SELECTOR_RPL_MASK 0x03 // bits 0-1
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#define SELECTOR_LDT 0x04 // bit 2
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// for data selectors
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#define DATA_ACCESS_MASK (1<<0)
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#define DATA_WRITE_ENABLE_MASK (1<<1)
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#define DATA_EXPAND_DOWN_MASK (1<<2)
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// for code selectors
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#define CODE_ACCESS_MASK (1<<0)
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#define CODE_READ_MASK (1<<1)
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#define CODE_CONFORMING_MASK (1<<2)
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#define CODE_FLAG (1<<3)
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#define TASK_GATE 5
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#define INTERRUPT_GATE 6
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#define TRAP_GATE 7
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typedef struct _IDT_ENTRY
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{
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USHORT LowOffset;
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USHORT Selector;
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UCHAR Ignored : 5;
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UCHAR Zero : 3;
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UCHAR Type : 3;
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UCHAR Is32Bit : 1;
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UCHAR Ignored2 : 1;
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UCHAR DPL : 2;
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UCHAR Present : 1;
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USHORT HighOffset;
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#ifdef _WIN64
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ULONG HighOffset64;
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ULONG Reserved;
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#endif
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} IDT_ENTRY, TRAP_GATE_ENTRY;
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typedef struct _CALL_GATE_ENTRY
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{
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USHORT LowOffset;
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USHORT Selector;
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UCHAR ParameterCount: 4;
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UCHAR Ignored : 3;
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UCHAR Type : 5;
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UCHAR DPL : 2;
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UCHAR Present : 1;
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USHORT HighOffset;
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#ifdef _WIN64
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ULONG HighOffset64;
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ULONG Reserved;
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#endif
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} CALL_GATE_ENTRY;
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typedef struct _TASK_GATE_ENTRY
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{
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USHORT Ignored;
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USHORT Selector;
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UCHAR Ignored2 : 5;
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UCHAR Zero : 3;
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UCHAR Type : 5;
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UCHAR DPL : 2;
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UCHAR Present : 1;
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USHORT Ignored3;
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} TASK_GATE_ENTRY;
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typedef struct _DESCRIPTOR_ENTRY
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{
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USHORT LimitLow;
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USHORT BaseLow;
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UCHAR BaseMid;
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UCHAR Type : 4; // 10EWA (code), E=ExpandDown, W=Writable, A=Accessed
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// 11CRA (data), C=Conforming, R=Readable, A=Accessed
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UCHAR System : 1; // if 1 then it is a gate or LDT
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UCHAR DPL : 2; // descriptor privilege level;
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// for data selectors, MAX(CPL, RPL) must be <= DPL to access (or else GP# fault)
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// for non-conforming code selectors (without callgate), MAX(CPL, RPL) must be <= DPL to access (or else GP# fault)
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// for conforming code selectors, MAX(CPL, RPL) must be >= DPL (i.e., CPL 0-2 cannot access if DPL is 3)
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// for non-conforming code selectors (with call gate), DPL indicates lowest privilege allowed to access gate
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UCHAR Present : 1;
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UCHAR LimitHigh : 4;
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UCHAR Available: 1; // aka AVL
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UCHAR Reserved : 1;
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UCHAR Is32Bit : 1; // aka B flag
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UCHAR Granularity : 1; // aka G flag
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UCHAR BaseHi : 8;
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#ifdef _WIN64
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ULONG HighOffset64;
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ULONG Reserved2;
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#endif
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} DESCRIPTOR_ENTRY;
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typedef struct _GATE_ENTRY
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{
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USHORT LowOffset;
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UCHAR Skip;
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UCHAR Type : 5;
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UCHAR DPL : 2;
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UCHAR Present : 1;
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USHORT HighOffset;
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#ifdef _WIN64
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ULONG HighOffset64;
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ULONG Reserved;
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#endif
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} GATE_ENTRY;
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// TODO: update for X64
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typedef struct _PTE_ENTRY
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{
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ULONG Present : 1;
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ULONG Write : 1;
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ULONG Owner : 1; // E.g., user mode or supervisor mode
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ULONG WriteThrough : 1;
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ULONG CacheDisable : 1;
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ULONG Accessed : 1;
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ULONG Dirty : 1;
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ULONG PAT : 1;
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ULONG Global : 1;
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ULONG CopyOnWrite : 1;
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ULONG Prototype : 1;
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ULONG Transition : 1;
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ULONG Address : 20;
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} PTE_ENTRY;
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// TODO: update for X64
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typedef struct _PDE_ENTRY
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{
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ULONG Present : 1;
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ULONG Write : 1;
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ULONG Owner : 1;
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ULONG WriteThrough : 1;
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ULONG CacheDisable : 1;
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ULONG Accessed : 1;
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ULONG Reserved1 : 1;
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ULONG PageSize : 1;
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ULONG Global : 1;
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ULONG Reserved : 3;
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ULONG Address : 20;
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} PDE_ENTRY;
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// TODO: update for X64
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typedef struct _IO_ACCESS_MAP
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{
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UCHAR DirectionMap[32];
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UCHAR IoMap[8196];
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} IO_ACCESS_MAP;
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#define MIN_TSS_SIZE FIELD_OFFSET(TSS_ENTRY, IoMaps)
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// TODO: update for X64
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typedef struct _TSS_ENTRY
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{
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USHORT Backlink;
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USHORT Reserved0;
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ULONG Esp0;
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USHORT Ss0;
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USHORT Reserved1;
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ULONG NotUsed1[4];
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ULONG CR3;
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ULONG Eip;
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ULONG NotUsed2[9];
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USHORT Es;
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USHORT Reserved2;
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USHORT Cs;
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USHORT Reserved3;
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USHORT Ss;
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USHORT Reserved4;
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USHORT Ds;
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USHORT Reserved5;
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USHORT Fs;
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USHORT Reserved6;
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USHORT Gs;
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USHORT Reserved7;
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USHORT LDT;
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USHORT Reserved8;
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USHORT Flags;
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USHORT IoMapBase;
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IO_ACCESS_MAP IoMaps[1];
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UCHAR IntDirectionMap[32];
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} TSS_ENTRY;
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// TODO: update for X64
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typedef struct _TSS16_ENTRY
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{
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USHORT Backlink;
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USHORT Sp0;
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USHORT Ss0;
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USHORT Sp1;
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USHORT Ss1;
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USHORT Sp2;
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USHORT Ss3;
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USHORT Ip;
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USHORT Flags;
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USHORT Ax;
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USHORT Cx;
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USHORT Dx;
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USHORT Bx;
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USHORT Sp;
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USHORT Bp;
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USHORT Si;
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USHORT Di;
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USHORT Es;
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USHORT Cs;
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USHORT Ss;
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USHORT Ds;
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USHORT LDT;
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} TSS16_ENTRY;
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// TODO: update for X64
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typedef struct _GDT_ENTRY
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{
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USHORT LimitLow;
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USHORT BaseLow;
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union {
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struct {
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UCHAR BaseMid;
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UCHAR Flags1;
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UCHAR Flags2;
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UCHAR BaseHi;
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} Bytes;
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struct {
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ULONG BaseMid : 8;
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ULONG Type : 5;
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ULONG Dpl : 2;
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ULONG Pres : 1;
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ULONG LimitHi : 4;
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ULONG Sys : 1;
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ULONG Reserved_0 : 1;
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ULONG Default_Big : 1;
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ULONG Granularity : 1;
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ULONG BaseHi : 8;
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} Bits;
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} HighWord;
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} GDT_ENTRY;
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BYTE *GetAbsoluteAddressFromSegment(BYTE Segment, DWORD Offset);
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BYTE *GetAbsoluteAddressFromSelector(WORD Selector, DWORD Offset);
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#pragma pack(pop)
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#ifdef __cplusplus
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}
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#endif
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#endif // CPU_H
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