huwcampbell.com
Reactos
1/*
2 * Fast486 386/486 CPU Emulation Library
3 * common.h
4 *
5 * Copyright (C) 2015 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 */
21
22#ifndef _COMMON_H_
23#define _COMMON_H_
24
25#pragma once
26
27/* DEFINES ********************************************************************/
28
29#define SIGN_FLAG_BYTE 0x80
30#define SIGN_FLAG_WORD 0x8000
31#define SIGN_FLAG_LONG 0x80000000
32#define REAL_MODE_FLAGS_MASK 0x57FD5
33#define PROT_MODE_FLAGS_MASK 0x50DD5
34
35/* Block size for string operations */
36#define STRING_BLOCK_SIZE 4096
37
38#define GET_SEGMENT_RPL(s) ((s) & 3u)
39#define GET_SEGMENT_INDEX(s) ((s) & 0xFFF8u)
40#define SEGMENT_TABLE_INDICATOR (1 << 2)
41#define EXCEPTION_HAS_ERROR_CODE(x) (((x) == 8) || ((x) >= 10 && (x) <= 14))
42
43#define NO_LOCK_PREFIX()\
44if (State->PrefixFlags & FAST486_PREFIX_LOCK)\
45{\
46 Fast486Exception(State, FAST486_EXCEPTION_UD);\
47 return;\
48}
49
50#define TOGGLE_OPSIZE(x)\
51 if (State->PrefixFlags & FAST486_PREFIX_OPSIZE) x = !x;
52
53#define TOGGLE_ADSIZE(x)\
54 if (State->PrefixFlags & FAST486_PREFIX_ADSIZE) x = !x;
55
56#define SWAP(x, y) { (x) ^= (y); (y) ^= (x); (x) ^= (y); }
57
58#define ALIGNMENT_CHECK(x, a) if (State->Flags.Ac \
59 && (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_AM)\
60 && (State->Cpl == 3)\
61 && (((x) % (a)) != 0))\
62{\
63 Fast486Exception(State, FAST486_EXCEPTION_AC);\
64 return FALSE;\
65}
66
67#define PAGE_ALIGN(x) ((x) & 0xFFFFF000)
68#define PAGE_OFFSET(x) ((x) & 0x00000FFF)
69#define GET_ADDR_PDE(x) ((x) >> 22)
70#define GET_ADDR_PTE(x) (((x) >> 12) & 0x3FF)
71#define INVALID_TLB_FIELD 0xFFFFFFFF
72#define NUM_TLB_ENTRIES 0x100000
73
74typedef struct _FAST486_MOD_REG_RM
75{
76 FAST486_GEN_REGS Register;
77 BOOLEAN Memory;
78 union
79 {
80 FAST486_GEN_REGS SecondRegister;
81 ULONG MemoryAddress;
82 };
83} FAST486_MOD_REG_RM, *PFAST486_MOD_REG_RM;
84
85typedef enum _FAST486_TASK_SWITCH_TYPE
86{
87 FAST486_TASK_JUMP,
88 FAST486_TASK_CALL,
89 FAST486_TASK_RETURN
90} FAST486_TASK_SWITCH_TYPE, *PFAST486_TASK_SWITCH_TYPE;
91
92#include <pshpack1.h>
93
94typedef union _FAST486_PAGE_DIR
95{
96 struct
97 {
98 ULONG Present : 1;
99 ULONG Writeable : 1;
100 ULONG Usermode : 1;
101 ULONG WriteThrough : 1;
102 ULONG NoCache : 1;
103 ULONG Accessed : 1;
104 ULONG AlwaysZero : 1;
105 ULONG Size : 1;
106 ULONG Unused : 4;
107 ULONG TableAddress : 20;
108 };
109 ULONG Value;
110} FAST486_PAGE_DIR, *PFAST486_PAGE_DIR;
111
112C_ASSERT(sizeof(FAST486_PAGE_DIR) == sizeof(ULONG));
113
114typedef union _FAST486_PAGE_TABLE
115{
116 struct
117 {
118 ULONG Present : 1;
119 ULONG Writeable : 1;
120 ULONG Usermode : 1;
121 ULONG WriteThrough : 1;
122 ULONG NoCache : 1;
123 ULONG Accessed : 1;
124 ULONG Dirty : 1;
125 ULONG AlwaysZero : 1;
126 ULONG Global : 1;
127 ULONG Unused : 3;
128 ULONG Address : 20;
129 };
130 ULONG Value;
131} FAST486_PAGE_TABLE, *PFAST486_PAGE_TABLE;
132
133C_ASSERT(sizeof(FAST486_PAGE_DIR) == sizeof(ULONG));
134
135#include <poppack.h>
136
137/* FUNCTIONS ******************************************************************/
138
139BOOLEAN
140FASTCALL
141Fast486ReadMemory
142(
143 PFAST486_STATE State,
144 FAST486_SEG_REGS SegmentReg,
145 ULONG Offset,
146 BOOLEAN InstFetch,
147 PVOID Buffer,
148 ULONG Size
149);
150
151BOOLEAN
152FASTCALL
153Fast486WriteMemory
154(
155 PFAST486_STATE State,
156 FAST486_SEG_REGS SegmentReg,
157 ULONG Offset,
158 PVOID Buffer,
159 ULONG Size
160);
161
162BOOLEAN
163FASTCALL
164Fast486PerformInterrupt
165(
166 PFAST486_STATE State,
167 UCHAR Number
168);
169
170VOID
171FASTCALL
172Fast486ExceptionWithErrorCode
173(
174 PFAST486_STATE State,
175 FAST486_EXCEPTIONS ExceptionCode,
176 ULONG ErrorCode
177);
178
179BOOLEAN
180FASTCALL
181Fast486TaskSwitch
182(
183 PFAST486_STATE State,
184 FAST486_TASK_SWITCH_TYPE Type,
185 USHORT Selector
186);
187
188BOOLEAN
189FASTCALL
190Fast486CallGate
191(
192 PFAST486_STATE State,
193 PFAST486_CALL_GATE Gate,
194 BOOLEAN Call
195);
196
197/* INLINED FUNCTIONS **********************************************************/
198
199#include "common.inl"
200
201#endif // _COMMON_H_
202
203/* EOF */