| 1 |
/* |
| 2 |
* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface |
| 3 |
* |
| 4 |
* Basilisk II (C) 1997-2000 Christian Bauer |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#include "sysdeps.h" |
| 22 |
#include "cpu_emulation.h" |
| 23 |
#include "main.h" |
| 24 |
#include "emul_op.h" |
| 25 |
#include "rom_patches.h" |
| 26 |
#include "m68k.h" |
| 27 |
#include "memory.h" |
| 28 |
#include "readcpu.h" |
| 29 |
#include "newcpu.h" |
| 30 |
#include "compiler.h" |
| 31 |
|
| 32 |
|
| 33 |
// RAM and ROM pointers |
| 34 |
uint32 RAMBaseMac; // RAM base (Mac address space) |
| 35 |
uint8 *RAMBaseHost; // RAM base (host address space) |
| 36 |
uint32 RAMSize; // Size of RAM |
| 37 |
uint32 ROMBaseMac; // ROM base (Mac address space) |
| 38 |
uint8 *ROMBaseHost; // ROM base (host address space) |
| 39 |
uint32 ROMSize; // Size of ROM |
| 40 |
|
| 41 |
#if !REAL_ADDRESSING |
| 42 |
// Mac frame buffer |
| 43 |
uint8 *MacFrameBaseHost; // Frame buffer base (host address space) |
| 44 |
uint32 MacFrameSize; // Size of frame buffer |
| 45 |
int MacFrameLayout; // Frame buffer layout |
| 46 |
#endif |
| 47 |
|
| 48 |
// From newcpu.cpp |
| 49 |
extern int quit_program; |
| 50 |
|
| 51 |
|
| 52 |
/* |
| 53 |
* Initialize 680x0 emulation, CheckROM() must have been called first |
| 54 |
*/ |
| 55 |
|
| 56 |
bool Init680x0(void) |
| 57 |
{ |
| 58 |
#if REAL_ADDRESSING |
| 59 |
// Mac address space = host address space |
| 60 |
RAMBaseMac = (uint32)RAMBaseHost; |
| 61 |
ROMBaseMac = (uint32)ROMBaseHost; |
| 62 |
#else |
| 63 |
// Initialize UAE memory banks |
| 64 |
RAMBaseMac = 0; |
| 65 |
switch (ROMVersion) { |
| 66 |
case ROM_VERSION_64K: |
| 67 |
case ROM_VERSION_PLUS: |
| 68 |
case ROM_VERSION_CLASSIC: |
| 69 |
ROMBaseMac = 0x00400000; |
| 70 |
break; |
| 71 |
case ROM_VERSION_II: |
| 72 |
ROMBaseMac = 0x00a00000; |
| 73 |
break; |
| 74 |
case ROM_VERSION_32: |
| 75 |
ROMBaseMac = 0x40800000; |
| 76 |
break; |
| 77 |
default: |
| 78 |
return false; |
| 79 |
} |
| 80 |
memory_init(); |
| 81 |
#endif |
| 82 |
|
| 83 |
init_m68k(); |
| 84 |
compiler_init(); |
| 85 |
return true; |
| 86 |
} |
| 87 |
|
| 88 |
|
| 89 |
/* |
| 90 |
* Deinitialize 680x0 emulation |
| 91 |
*/ |
| 92 |
|
| 93 |
void Exit680x0(void) |
| 94 |
{ |
| 95 |
} |
| 96 |
|
| 97 |
|
| 98 |
/* |
| 99 |
* Reset and start 680x0 emulation (doesn't return) |
| 100 |
*/ |
| 101 |
|
| 102 |
void Start680x0(void) |
| 103 |
{ |
| 104 |
m68k_reset(); |
| 105 |
m68k_go(true); |
| 106 |
} |
| 107 |
|
| 108 |
|
| 109 |
/* |
| 110 |
* Trigger interrupt |
| 111 |
*/ |
| 112 |
|
| 113 |
void TriggerInterrupt(void) |
| 114 |
{ |
| 115 |
regs.spcflags |= SPCFLAG_INT; |
| 116 |
} |
| 117 |
|
| 118 |
|
| 119 |
/* |
| 120 |
* Get 68k interrupt level |
| 121 |
*/ |
| 122 |
|
| 123 |
int intlev(void) |
| 124 |
{ |
| 125 |
return InterruptFlags ? 1 : 0; |
| 126 |
} |
| 127 |
|
| 128 |
|
| 129 |
/* |
| 130 |
* Execute MacOS 68k trap |
| 131 |
* r->a[7] and r->sr are unused! |
| 132 |
*/ |
| 133 |
|
| 134 |
void Execute68kTrap(uint16 trap, struct M68kRegisters *r) |
| 135 |
{ |
| 136 |
int i; |
| 137 |
|
| 138 |
// Save old PC |
| 139 |
uaecptr oldpc = m68k_getpc(); |
| 140 |
|
| 141 |
// Set registers |
| 142 |
for (i=0; i<8; i++) |
| 143 |
m68k_dreg(regs, i) = r->d[i]; |
| 144 |
for (i=0; i<7; i++) |
| 145 |
m68k_areg(regs, i) = r->a[i]; |
| 146 |
|
| 147 |
// Push trap and EXEC_RETURN on stack |
| 148 |
m68k_areg(regs, 7) -= 2; |
| 149 |
put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN); |
| 150 |
m68k_areg(regs, 7) -= 2; |
| 151 |
put_word(m68k_areg(regs, 7), trap); |
| 152 |
|
| 153 |
// Execute trap |
| 154 |
m68k_setpc(m68k_areg(regs, 7)); |
| 155 |
fill_prefetch_0(); |
| 156 |
quit_program = 0; |
| 157 |
m68k_go(true); |
| 158 |
|
| 159 |
// Clean up stack |
| 160 |
m68k_areg(regs, 7) += 4; |
| 161 |
|
| 162 |
// Restore old PC |
| 163 |
m68k_setpc(oldpc); |
| 164 |
fill_prefetch_0(); |
| 165 |
|
| 166 |
// Get registers |
| 167 |
for (i=0; i<8; i++) |
| 168 |
r->d[i] = m68k_dreg(regs, i); |
| 169 |
for (i=0; i<7; i++) |
| 170 |
r->a[i] = m68k_areg(regs, i); |
| 171 |
quit_program = 0; |
| 172 |
} |
| 173 |
|
| 174 |
|
| 175 |
/* |
| 176 |
* Execute 68k subroutine |
| 177 |
* The executed routine must reside in UAE memory! |
| 178 |
* r->a[7] and r->sr are unused! |
| 179 |
*/ |
| 180 |
|
| 181 |
void Execute68k(uint32 addr, struct M68kRegisters *r) |
| 182 |
{ |
| 183 |
int i; |
| 184 |
|
| 185 |
// Save old PC |
| 186 |
uaecptr oldpc = m68k_getpc(); |
| 187 |
|
| 188 |
// Set registers |
| 189 |
for (i=0; i<8; i++) |
| 190 |
m68k_dreg(regs, i) = r->d[i]; |
| 191 |
for (i=0; i<7; i++) |
| 192 |
m68k_areg(regs, i) = r->a[i]; |
| 193 |
|
| 194 |
// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack |
| 195 |
m68k_areg(regs, 7) -= 2; |
| 196 |
put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN); |
| 197 |
m68k_areg(regs, 7) -= 4; |
| 198 |
put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4); |
| 199 |
|
| 200 |
// Execute routine |
| 201 |
m68k_setpc(addr); |
| 202 |
fill_prefetch_0(); |
| 203 |
quit_program = 0; |
| 204 |
m68k_go(true); |
| 205 |
|
| 206 |
// Clean up stack |
| 207 |
m68k_areg(regs, 7) += 2; |
| 208 |
|
| 209 |
// Restore old PC |
| 210 |
m68k_setpc(oldpc); |
| 211 |
fill_prefetch_0(); |
| 212 |
|
| 213 |
// Get registers |
| 214 |
for (i=0; i<8; i++) |
| 215 |
r->d[i] = m68k_dreg(regs, i); |
| 216 |
for (i=0; i<7; i++) |
| 217 |
r->a[i] = m68k_areg(regs, i); |
| 218 |
quit_program = 0; |
| 219 |
} |
