ReactOS 0.4.15-dev-8145-ga541a46
fast486.c
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1/*
2 * Fast486 386/486 CPU Emulation Library
3 * fast486.c
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/* INCLUDES *******************************************************************/
23
24#include <windef.h>
25
26// #define NDEBUG
27#include <debug.h>
28
29#include <fast486.h>
30#include "common.h"
31#include "opcodes.h"
32#include "fpu.h"
33
34/* DEFAULT CALLBACKS **********************************************************/
35
36static VOID
39{
42}
43
44static VOID
47{
50}
51
52static VOID
55{
59 UNREFERENCED_PARAMETER(DataCount);
61}
62
63static VOID
66{
70 UNREFERENCED_PARAMETER(DataCount);
72}
73
74static VOID
76Fast486BopCallback(PFAST486_STATE State, UCHAR BopCode)
77{
80}
81
82static UCHAR
85{
87
88 /* Return something... defaulted to single-step interrupt */
89 return 0x01;
90}
91
92static VOID
95{
97}
98
99/* PUBLIC FUNCTIONS ***********************************************************/
100
101VOID
102NTAPI
104 FAST486_MEM_READ_PROC MemReadCallback,
105 FAST486_MEM_WRITE_PROC MemWriteCallback,
106 FAST486_IO_READ_PROC IoReadCallback,
107 FAST486_IO_WRITE_PROC IoWriteCallback,
108 FAST486_BOP_PROC BopCallback,
109 FAST486_INT_ACK_PROC IntAckCallback,
110 FAST486_FPU_PROC FpuCallback,
111 PULONG Tlb)
112{
113 /* Set the callbacks (or use default ones if some are NULL) */
114 State->MemReadCallback = (MemReadCallback ? MemReadCallback : Fast486MemReadCallback );
115 State->MemWriteCallback = (MemWriteCallback ? MemWriteCallback : Fast486MemWriteCallback);
116 State->IoReadCallback = (IoReadCallback ? IoReadCallback : Fast486IoReadCallback );
117 State->IoWriteCallback = (IoWriteCallback ? IoWriteCallback : Fast486IoWriteCallback );
118 State->BopCallback = (BopCallback ? BopCallback : Fast486BopCallback );
119 State->IntAckCallback = (IntAckCallback ? IntAckCallback : Fast486IntAckCallback );
120 State->FpuCallback = (FpuCallback ? FpuCallback : Fast486FpuCallback );
121
122 /* Set the TLB (if given) */
123 State->Tlb = Tlb;
124
125 /* Reset the CPU */
127}
128
129VOID
130NTAPI
131Fast486Reset(PFAST486_STATE State)
132{
133 FAST486_SEG_REGS i;
134
135 /* Save the callbacks and TLB */
136 FAST486_MEM_READ_PROC MemReadCallback = State->MemReadCallback;
137 FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
138 FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;
139 FAST486_IO_WRITE_PROC IoWriteCallback = State->IoWriteCallback;
140 FAST486_BOP_PROC BopCallback = State->BopCallback;
141 FAST486_INT_ACK_PROC IntAckCallback = State->IntAckCallback;
142 FAST486_FPU_PROC FpuCallback = State->FpuCallback;
143 PULONG Tlb = State->Tlb;
144
145 /* Clear the entire structure */
146 RtlZeroMemory(State, sizeof(*State));
147
148 /* Initialize the registers */
149 State->Flags.AlwaysSet = 1;
150 State->InstPtr.LowWord = 0xFFF0;
151
152 /* Set the CPL to 0 */
153 State->Cpl = 0;
154
155 /* Initialize segments */
156 for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
157 {
158 State->SegmentRegs[i].Selector = 0;
159 State->SegmentRegs[i].Base = 0;
160 State->SegmentRegs[i].Limit = 0xFFFF;
161 State->SegmentRegs[i].Present = TRUE;
162 State->SegmentRegs[i].ReadWrite = TRUE;
163 State->SegmentRegs[i].Executable = FALSE;
164 State->SegmentRegs[i].DirConf = FALSE;
165 State->SegmentRegs[i].SystemType = 1; // Segment descriptor
166 State->SegmentRegs[i].Dpl = 0;
167 State->SegmentRegs[i].Size = FALSE; // 16-bit
168 }
169
170 /* Initialize the code segment */
171 State->SegmentRegs[FAST486_REG_CS].Executable = TRUE;
172 State->SegmentRegs[FAST486_REG_CS].Selector = 0xF000;
173 State->SegmentRegs[FAST486_REG_CS].Base = 0xFFFF0000;
174
175 /* Initialize the IDT */
176 State->Idtr.Size = 0x3FF;
177 State->Idtr.Address = 0;
178
179#ifndef FAST486_NO_FPU
180 /* Initialize CR0 */
181 State->ControlRegisters[FAST486_REG_CR0] |= FAST486_CR0_ET;
182
183 /* Initialize the FPU control and tag registers */
184 State->FpuControl.Value = FAST486_FPU_DEFAULT_CONTROL;
185 State->FpuStatus.Value = 0;
186 State->FpuTag = 0xFFFF;
187#endif
188
189 /* Restore the callbacks and TLB */
190 State->MemReadCallback = MemReadCallback;
191 State->MemWriteCallback = MemWriteCallback;
192 State->IoReadCallback = IoReadCallback;
193 State->IoWriteCallback = IoWriteCallback;
194 State->BopCallback = BopCallback;
195 State->IntAckCallback = IntAckCallback;
196 State->FpuCallback = FpuCallback;
197 State->Tlb = Tlb;
198
199 /* Flush the TLB */
200 Fast486FlushTlb(State);
201}
202
203VOID
204NTAPI
206{
207 State->IntSignaled = TRUE;
208}
209
210VOID
211NTAPI
213{
214 /* Load the new CS */
215 if (!Fast486LoadSegment(State, FAST486_REG_CS, Segment))
216 {
217 /* An exception occurred, let the handler execute instead */
218 return;
219 }
220
221 /* Set the new IP */
222 State->InstPtr.Long = Offset;
223}
224
225VOID
226NTAPI
228{
229 /* Load the new SS */
230 if (!Fast486LoadSegment(State, FAST486_REG_SS, Segment))
231 {
232 /* An exception occurred, let the handler execute instead */
233 return;
234 }
235
236 /* Set the new SP */
237 State->GeneralRegs[FAST486_REG_ESP].Long = Offset;
238}
239
240VOID
241NTAPI
243 FAST486_SEG_REGS Segment,
244 USHORT Selector)
245{
246 /* Call the internal function */
247 Fast486LoadSegment(State, Segment, Selector);
248}
249
250VOID
251NTAPI
252Fast486Rewind(PFAST486_STATE State)
253{
254 /* This function is used when an instruction has been interrupted remotely */
255 State->PrefixFlags = 0;
256 State->InstPtr.Long = State->SavedInstPtr.Long;
257
258#ifndef FAST486_NO_PREFETCH
259 State->PrefetchValid = FALSE;
260#endif
261}
262
263/* EOF */
Definition: bufpool.h:45
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
#define UlongToPtr(u)
Definition: config.h:106
VOID NTAPI Fast486SetStack(PFAST486_STATE State, USHORT Segment, ULONG Offset)
Definition: fast486.c:227
static VOID FASTCALL Fast486IoReadCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
Definition: fast486.c:54
static VOID FASTCALL Fast486MemReadCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
Definition: fast486.c:38
static VOID FASTCALL Fast486BopCallback(PFAST486_STATE State, UCHAR BopCode)
Definition: fast486.c:76
VOID NTAPI Fast486InterruptSignal(PFAST486_STATE State)
Definition: fast486.c:205
static VOID FASTCALL Fast486FpuCallback(PFAST486_STATE State)
Definition: fast486.c:94
VOID NTAPI Fast486Rewind(PFAST486_STATE State)
Definition: fast486.c:252
VOID NTAPI Fast486Initialize(PFAST486_STATE State, FAST486_MEM_READ_PROC MemReadCallback, FAST486_MEM_WRITE_PROC MemWriteCallback, FAST486_IO_READ_PROC IoReadCallback, FAST486_IO_WRITE_PROC IoWriteCallback, FAST486_BOP_PROC BopCallback, FAST486_INT_ACK_PROC IntAckCallback, FAST486_FPU_PROC FpuCallback, PULONG Tlb)
Definition: fast486.c:103
VOID NTAPI Fast486SetSegment(PFAST486_STATE State, FAST486_SEG_REGS Segment, USHORT Selector)
Definition: fast486.c:242
static UCHAR FASTCALL Fast486IntAckCallback(PFAST486_STATE State)
Definition: fast486.c:84
static VOID FASTCALL Fast486MemWriteCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
Definition: fast486.c:46
VOID NTAPI Fast486Reset(PFAST486_STATE State)
Definition: fast486.c:131
static VOID FASTCALL Fast486IoWriteCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
Definition: fast486.c:65
VOID NTAPI Fast486ExecuteAt(PFAST486_STATE State, USHORT Segment, ULONG Offset)
Definition: fast486.c:212
#define FAST486_FPU_DEFAULT_CONTROL
Definition: fast486.h:105
#define FAST486_NUM_SEG_REGS
Definition: fast486.h:41
#define FAST486_CR0_ET
Definition: fast486.h:50
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
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CPPORT Port[4]
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#define FASTCALL
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uint32_t ULONG
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