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[/] [eco32/] [trunk/] [sim/] [memory.c] - Blame information for rev 131

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1 8 hellwig 
/*
2 
 * memory.c -- physical memory simulation
3 
 */
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5 
 
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#include "common.h"
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#include "console.h"
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#include "error.h"
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#include "except.h"
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#include "cpu.h"
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#include "memory.h"
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#include "timer.h"
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#include "dspkbd.h"
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#include "term.h"
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#include "disk.h"
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#include "output.h"
22 25 hellwig 
#include "shutdown.h"
23 8 hellwig 
#include "graph.h"
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25 
 
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static Byte *rom;
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static Byte *mem;
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static unsigned int memSize;
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static FILE *romImage;
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static unsigned int romSize;
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static FILE *progImage;
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static unsigned int progSize;
33 91 hellwig 
static unsigned int progAddr;
34 8 hellwig 
 
35 
 
36 
Word memoryReadWord(Word pAddr) {
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  Word data;
38 
 
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  if (pAddr <= memSize - 4) {
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    data = ((Word) *(mem + pAddr + 0)) << 24 |
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           ((Word) *(mem + pAddr + 1)) << 16 |
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           ((Word) *(mem + pAddr + 2)) <<  8 |
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           ((Word) *(mem + pAddr + 3)) <<  0;
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    return data;
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  }
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  if (pAddr >= ROM_BASE &&
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      pAddr <= ROM_BASE + ROM_SIZE - 4) {
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    data = ((Word) *(rom + (pAddr - ROM_BASE) + 0)) << 24 |
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           ((Word) *(rom + (pAddr - ROM_BASE) + 1)) << 16 |
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           ((Word) *(rom + (pAddr - ROM_BASE) + 2)) <<  8 |
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           ((Word) *(rom + (pAddr - ROM_BASE) + 3)) <<  0;
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == TIMER_BASE) {
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    data = timerRead(pAddr & IO_REG_MASK);
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == DISPLAY_BASE) {
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    data = displayRead(pAddr & IO_REG_MASK);
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == KEYBOARD_BASE) {
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    data = keyboardRead(pAddr & IO_REG_MASK);
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == TERM_BASE) {
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    data = termRead(pAddr & IO_REG_MASK);
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == DISK_BASE) {
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    data = diskRead(pAddr & IO_REG_MASK);
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    return data;
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  }
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  if ((pAddr & IO_DEV_MASK) == OUTPUT_BASE) {
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    data = outputRead(pAddr & IO_REG_MASK);
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    return data;
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  }
78 25 hellwig 
  if ((pAddr & IO_DEV_MASK) == SHUTDOWN_BASE) {
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    data = shutdownRead(pAddr & IO_REG_MASK);
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    return data;
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  }
82 8 hellwig 
  if ((pAddr & IO_DEV_MASK) >= GRAPH_BASE) {
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    data = graphRead(pAddr & IO_GRAPH_MASK);
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    return data;
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  }
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  /* throw bus timeout exception */
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  throwException(EXC_BUS_TIMEOUT);
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  /* not reached */
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  data = 0;
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  return data;
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}
92 
 
93 
 
94 
Half memoryReadHalf(Word pAddr) {
95 
  Half data;
96 
 
97 
  if (pAddr <= memSize - 2) {
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    data = ((Half) *(mem + pAddr + 0)) << 8 |
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           ((Half) *(mem + pAddr + 1)) << 0;
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    return data;
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  }
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  if (pAddr >= ROM_BASE &&
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      pAddr <= ROM_BASE + ROM_SIZE - 2) {
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    data = ((Half) *(rom + (pAddr - ROM_BASE) + 0)) << 8 |
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           ((Half) *(rom + (pAddr - ROM_BASE) + 1)) << 0;
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    return data;
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  }
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  /* throw bus timeout exception */
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  throwException(EXC_BUS_TIMEOUT);
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  /* not reached */
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  data = 0;
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  return data;
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}
114 
 
115 
 
116 
Byte memoryReadByte(Word pAddr) {
117 
  Byte data;
118 
 
119 
  if (pAddr <= memSize - 1) {
120 
    data = ((Byte) *(mem + pAddr + 0)) << 0;
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    return data;
122 
  }
123 
  if (pAddr >= ROM_BASE &&
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      pAddr <= ROM_BASE + ROM_SIZE - 1) {
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    data = ((Byte) *(rom + (pAddr - ROM_BASE) + 0)) << 0;
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    return data;
127 
  }
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  /* throw bus timeout exception */
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  throwException(EXC_BUS_TIMEOUT);
130 
  /* not reached */
131 
  data = 0;
132 
  return data;
133 
}
134 
 
135 
 
136 
void memoryWriteWord(Word pAddr, Word data) {
137 
  if (pAddr <= memSize - 4) {
138 
    *(mem + pAddr + 0) = (Byte) (data >> 24);
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    *(mem + pAddr + 1) = (Byte) (data >> 16);
140 
    *(mem + pAddr + 2) = (Byte) (data >>  8);
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    *(mem + pAddr + 3) = (Byte) (data >>  0);
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    return;
143 
  }
144 
  if ((pAddr & IO_DEV_MASK) == TIMER_BASE) {
145 
    timerWrite(pAddr & IO_REG_MASK, data);
146 
    return;
147 
  }
148 
  if ((pAddr & IO_DEV_MASK) == DISPLAY_BASE) {
149 
    displayWrite(pAddr & IO_REG_MASK, data);
150 
    return;
151 
  }
152 
  if ((pAddr & IO_DEV_MASK) == KEYBOARD_BASE) {
153 
    keyboardWrite(pAddr & IO_REG_MASK, data);
154 
    return;
155 
  }
156 
  if ((pAddr & IO_DEV_MASK) == TERM_BASE) {
157 
    termWrite(pAddr & IO_REG_MASK, data);
158 
    return;
159 
  }
160 
  if ((pAddr & IO_DEV_MASK) == DISK_BASE) {
161 
    diskWrite(pAddr & IO_REG_MASK, data);
162 
    return;
163 
  }
164 
  if ((pAddr & IO_DEV_MASK) == OUTPUT_BASE) {
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    outputWrite(pAddr & IO_REG_MASK, data);
166 
    return;
167 
  }
168 25 hellwig 
  if ((pAddr & IO_DEV_MASK) == SHUTDOWN_BASE) {
169 
    shutdownWrite(pAddr & IO_REG_MASK, data);
170 
    return;
171 
  }
172 8 hellwig 
  if ((pAddr & IO_DEV_MASK) >= GRAPH_BASE) {
173 
    graphWrite(pAddr & IO_GRAPH_MASK, data);
174 
    return;
175 
  }
176 
  /* throw bus timeout exception */
177 
  throwException(EXC_BUS_TIMEOUT);
178 
}
179 
 
180 
 
181 
void memoryWriteHalf(Word pAddr, Half data) {
182 
  if (pAddr <= memSize - 2) {
183 
    *(mem + pAddr + 0) = (Byte) (data >> 8);
184 
    *(mem + pAddr + 1) = (Byte) (data >> 0);
185 
    return;
186 
  }
187 
  /* throw bus timeout exception */
188 
  throwException(EXC_BUS_TIMEOUT);
189 
}
190 
 
191 
 
192 
void memoryWriteByte(Word pAddr, Byte data) {
193 
  if (pAddr <= memSize - 1) {
194 
    *(mem + pAddr + 0) = (Byte) (data >> 0);
195 
    return;
196 
  }
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  /* throw bus timeout exception */
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  throwException(EXC_BUS_TIMEOUT);
199 
}
200 
 
201 
 
202 
void memoryReset(void) {
203 
  unsigned int i;
204 
 
205 
  cPrintf("Resetting Memory...\n");
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  for (i = 0; i < memSize; i++) {
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    mem[i] = rand();
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  }
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  cPrintf("%6d MB RAM installed", memSize / M);
210 
  if (progImage != NULL) {
211 
    fseek(progImage, 0, SEEK_SET);
212 91 hellwig 
    if (fread(mem + progAddr, progSize, 1, progImage) != 1) {
213 8 hellwig 
      error("cannot read program image file");
214 
    }
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    cPrintf(", %d bytes loaded", progSize);
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  }
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  cPrintf(".\n");
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  for (i = 0; i < ROM_SIZE; i++) {
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    rom[i] = 0xFF;
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  }
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  if (romImage != NULL) {
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    fseek(romImage, 0, SEEK_SET);
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    if (fread(rom, romSize, 1, romImage) != 1) {
224 
      error("cannot read ROM image file");
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    }
226 
    cPrintf("%6d KB ROM installed, %d bytes programmed.\n",
227 
            ROM_SIZE / K, romSize);
228 
  }
229 
}
230 
 
231 
 
232 
void memoryInit(unsigned int memorySize,
233 
                char *progImageName,
234 91 hellwig 
                unsigned int loadAddr,
235 8 hellwig 
                char *romImageName) {
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  /* allocate RAM */
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  memSize = memorySize;
238 
  mem = malloc(memSize);
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  if (mem == NULL) {
240 
    error("cannot allocate RAM");
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  }
242 
  /* possibly load program image */
243 
  if (progImageName == NULL) {
244 
    /* no program to load */
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    progImage = NULL;
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  } else {
247 
    /* load program */
248 
    progImage = fopen(progImageName, "rb");
249 
    if (progImage == NULL) {
250 
      error("cannot open program file '%s'", progImageName);
251 
    }
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    fseek(progImage, 0, SEEK_END);
253 
    progSize = ftell(progImage);
254 91 hellwig 
    progAddr = loadAddr;
255 
    if (progAddr + progSize > memSize) {
256 
      error("program file or load address too big");
257 8 hellwig 
    }
258 
    /* do actual loading of image in memoryReset() */
259 
  }
260 
  /* allocate ROM */
261 
  rom = malloc(ROM_SIZE);
262 
  if (rom == NULL) {
263 
    error("cannot allocate ROM");
264 
  }
265 
  /* possibly load ROM image */
266 
  if (romImageName == NULL) {
267 
    /* no ROM to plug in */
268 
    romImage = NULL;
269 
  } else {
270 
    /* plug in ROM */
271 
    romImage = fopen(romImageName, "rb");
272 
    if (romImage == NULL) {
273 
      error("cannot open ROM image '%s'", romImageName);
274 
    }
275 
    fseek(romImage, 0, SEEK_END);
276 
    romSize = ftell(romImage);
277 
    if (romSize > ROM_SIZE) {
278 
      error("ROM image too big");
279 
    }
280 
    /* do actual loading of image in memoryReset() */
281 
  }
282 
  memoryReset();
283 
}
284 
 
285 
 
286 
void memoryExit(void) {
287 
  free(mem);
288 
  free(rom);
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}

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