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[/] [eco32/] [trunk/] [stdalone/] [wrtmbr/] [main.c] - Blame information for rev 18

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Line No. Rev Author Line
1 18 hellwig 
/*
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 * main.c -- start the ball rolling
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 */
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5 
 
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#include "stdarg.h"
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#include "start.h"
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9 
 
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#define SCT_SIZE        512             /* in bytes */
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#define DISK_BASE       0xF0400000
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#define DISK_CTRL       0                /* word offset from DISK_BASE */
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#define DISK_CNT        1               /* ditto */
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#define DISK_SCT        2               /* ditto */
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#define DISK_CAP        3               /* ditto */
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#define DISK_BUF_STRT   0x00020000      /* word offset from DISK_BASE */
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#define DISK_BUF_SIZE   0x00000400      /* in words */
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#define DISK_CTRL_STRT  0x01
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#define DISK_CTRL_IEN   0x02
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#define DISK_CTRL_WRT   0x04
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#define DISK_CTRL_ERR   0x08
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#define DISK_CTRL_DONE  0x10
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#define DISK_CTRL_RDY   0x20
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/**************************************************************/
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32 
 
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void putchar(char c) {
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  unsigned int *base;
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  if (c == '\n') {
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    putchar('\r');
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  }
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  base = (unsigned int *) 0xF0300000;
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  while ((*(base + 2) & 1) == 0) ;
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  *(base + 3) = c;
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}
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void puts(char *s) {
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  char c;
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  while ((c = *s++) != '\0') {
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    putchar(c);
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  }
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}
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void printn(int n) {
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  int a;
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  if (n < 0) {
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    putchar('-');
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    n = -n;
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  }
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  a = n / 10;
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  if (a != 0) {
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    printn(a);
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  }
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  putchar(n % 10 + '0');
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}
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void printu(unsigned int n, unsigned int b) {
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  unsigned int a;
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  a = n / b;
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  if (a != 0) {
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    printu(a, b);
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  }
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  putchar("0123456789ABCDEF"[n % b]);
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}
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void printf(char *fmt, ...) {
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  va_list ap;
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  char c;
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  int n;
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  unsigned int u;
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  char *s;
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  va_start(ap, fmt);
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  while (1) {
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    while ((c = *fmt++) != '%') {
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      if (c == '\0') {
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        va_end(ap);
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        return;
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      }
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      putchar(c);
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    }
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    c = *fmt++;
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    if (c == 'd') {
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      n = va_arg(ap, int);
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      printn(n);
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    } else
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    if (c == 'u' || c == 'o' || c == 'x') {
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      u = va_arg(ap, int);
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      printu(u, c == 'o' ? 8 : (c == 'x' ? 16 : 10));
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    } else
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    if (c == 's') {
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      s = va_arg(ap, char *);
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      puts(s);
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    } else {
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      putchar(c);
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    }
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  }
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}
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/**************************************************************/
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117 
 
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static char *exceptionCause[32] = {
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  /* 00 */  "terminal 0 transmitter interrupt",
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  /* 01 */  "terminal 0 receiver interrupt",
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  /* 02 */  "terminal 1 transmitter interrupt",
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  /* 03 */  "terminal 1 receiver interrupt",
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  /* 04 */  "keyboard interrupt",
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  /* 05 */  "unknown interrupt",
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  /* 06 */  "unknown interrupt",
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  /* 07 */  "unknown interrupt",
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  /* 08 */  "disk interrupt",
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  /* 09 */  "unknown interrupt",
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  /* 10 */  "unknown interrupt",
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  /* 11 */  "unknown interrupt",
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  /* 12 */  "unknown interrupt",
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  /* 13 */  "unknown interrupt",
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  /* 14 */  "timer interrupt",
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  /* 15 */  "unknown interrupt",
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  /* 16 */  "bus timeout exception",
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  /* 17 */  "illegal instruction exception",
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  /* 18 */  "privileged instruction exception",
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  /* 19 */  "divide instruction exception",
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  /* 20 */  "trap instruction exception",
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  /* 21 */  "TLB miss exception",
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  /* 22 */  "TLB write exception",
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  /* 23 */  "TLB invalid exception",
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  /* 24 */  "illegal address exception",
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  /* 25 */  "privileged address exception",
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  /* 26 */  "unknown exception",
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  /* 27 */  "unknown exception",
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  /* 28 */  "unknown exception",
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  /* 29 */  "unknown exception",
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  /* 30 */  "unknown exception",
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  /* 31 */  "unknown exception"
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};
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int defaultISR(int irq) {
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  printf("\n%s\n", exceptionCause[irq]);
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  return 0;  /* do not skip any instruction */
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}
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159 
 
160 
void initInterrupts(void) {
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  int i;
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  for (i = 0; i < 32; i++) {
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    setISR(i, defaultISR);
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  }
166 
}
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/**************************************************************/
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171 
 
172 
/* the MBR buffer need not be word-aligned */
173 
unsigned char mbr[SCT_SIZE] = {
174 
  #include "mbr/mbr.dump"
175 
};
176 
 
177 
/* the following two buffers must be word-aligned */
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unsigned int wrBuf[SCT_SIZE / sizeof(unsigned int)];
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unsigned int rdBuf[SCT_SIZE / sizeof(unsigned int)];
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181 
 
182 
void copyMBR(void) {
183 
  unsigned char *p;
184 
  unsigned char *q;
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  int i;
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187 
  p = (unsigned char *) wrBuf;
188 
  q = (unsigned char *) mbr;
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  for (i = 0; i < SCT_SIZE; i++) {
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    *p++ = *q++;
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  }
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}
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195 
int compareMBR(void) {
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  unsigned char *p;
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  unsigned char *q;
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  int i;
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200 
  p = (unsigned char *) rdBuf;
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  q = (unsigned char *) mbr;
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  for (i = 0; i < SCT_SIZE; i++) {
203 
    if (*p++ != *q++) {
204 
      return 0;
205 
    }
206 
  }
207 
  return 1;
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}
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void clearCtrl(void) {
212 
  unsigned int *p;
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  int i;
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  p = (unsigned int *) DISK_BASE + DISK_BUF_STRT;
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  for (i = 0; i < DISK_BUF_SIZE; i++) {
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    *p++ = 0;
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  }
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}
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222 
void copyToCtrl(void) {
223 
  unsigned int *p;
224 
  unsigned int *q;
225 
  int i;
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227 
  p = (unsigned int *) DISK_BASE + DISK_BUF_STRT;
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  q = (unsigned int *) wrBuf;
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  for (i = 0; i < SCT_SIZE / sizeof(unsigned int); i++) {
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    *p++ = *q++;
231 
  }
232 
}
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void copyFromCtrl(void) {
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  unsigned int *p;
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  unsigned int *q;
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  int i;
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240 
  p = (unsigned int *) rdBuf;
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  q = (unsigned int *) DISK_BASE + DISK_BUF_STRT;
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  for (i = 0; i < SCT_SIZE / sizeof(unsigned int); i++) {
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    *p++ = *q++;
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  }
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}
246 
 
247 
 
248 
int checkDiskReady(void) {
249 
  unsigned int *p;
250 
  int tries;
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  int i;
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253 
  p = (unsigned int *) DISK_BASE;
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  for (tries = 0; tries < 10; tries++) {
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    for (i = 0; i < 500000; i++) {
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      if ((*(p + DISK_CTRL) & DISK_CTRL_RDY) != 0) {
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        return 1;
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      }
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    }
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    printf(".");
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  }
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  return 0;
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}
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266 
void writeMBR(void) {
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  unsigned int *p;
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  p = (unsigned int *) DISK_BASE;
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  *(p + DISK_CNT) = 1;
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  *(p + DISK_SCT) = 0;
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  *(p + DISK_CTRL) = DISK_CTRL_WRT | DISK_CTRL_STRT;
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  while ((*(p + DISK_CTRL) & DISK_CTRL_DONE) == 0) ;
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}
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277 
void readMBR(void) {
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  unsigned int *p;
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280 
  p = (unsigned int *) DISK_BASE;
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  *(p + DISK_CNT) = 1;
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  *(p + DISK_SCT) = 0;
283 
  *(p + DISK_CTRL) = DISK_CTRL_STRT;
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  while ((*(p + DISK_CTRL) & DISK_CTRL_DONE) == 0) ;
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}
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void main(void) {
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  initInterrupts();
290 
  printf("Checking disk ready...");
291 
  if (!checkDiskReady()) {
292 
    printf(" disk not ready\n");
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  } else {
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    printf(" ok\n");
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    printf("Writing MBR...\n");
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    copyMBR();
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    clearCtrl();
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    copyToCtrl();
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    writeMBR();
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    printf("Reading MBR...\n");
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    clearCtrl();
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    readMBR();
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    copyFromCtrl();
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    printf("Comparing MBR...");
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    if (!compareMBR()) {
306 
      printf(" error\n");
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    } else {
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      printf(" ok\n");
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    }
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  }
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  printf("Halting...\n");
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}

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