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https://opencores.org/ocsvn/eco32/eco32/trunk
Subversion Repositories eco32
[/] [eco32/] [trunk/] [stdalone/] [dmpmbr/] [main.c] - Rev 231
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/* * main.c -- dump the master boot record of a disk */ #include "types.h" #include "stdarg.h" #include "iolib.h" #include "start.h" #include "idedsk.h" /**************************************************************/ void error(char *fmt, ...) { va_list ap; va_start(ap, fmt); printf("Error: "); vprintf(fmt, ap); printf(", halting...\n"); va_end(ap); while (1) ; } /**************************************************************/ static char *exceptionCause[32] = { /* 00 */ "terminal 0 transmitter interrupt", /* 01 */ "terminal 0 receiver interrupt", /* 02 */ "terminal 1 transmitter interrupt", /* 03 */ "terminal 1 receiver interrupt", /* 04 */ "keyboard interrupt", /* 05 */ "unknown interrupt", /* 06 */ "unknown interrupt", /* 07 */ "unknown interrupt", /* 08 */ "disk interrupt", /* 09 */ "unknown interrupt", /* 10 */ "unknown interrupt", /* 11 */ "unknown interrupt", /* 12 */ "unknown interrupt", /* 13 */ "unknown interrupt", /* 14 */ "timer 0 interrupt", /* 15 */ "timer 1 interrupt", /* 16 */ "bus timeout exception", /* 17 */ "illegal instruction exception", /* 18 */ "privileged instruction exception", /* 19 */ "divide instruction exception", /* 20 */ "trap instruction exception", /* 21 */ "TLB miss exception", /* 22 */ "TLB write exception", /* 23 */ "TLB invalid exception", /* 24 */ "illegal address exception", /* 25 */ "privileged address exception", /* 26 */ "unknown exception", /* 27 */ "unknown exception", /* 28 */ "unknown exception", /* 29 */ "unknown exception", /* 30 */ "unknown exception", /* 31 */ "unknown exception" }; int defaultISR(int irq) { printf("\n%s\n", exceptionCause[irq]); return 0; /* do not skip any instruction */ } void initInterrupts(void) { int i; for (i = 0; i < 32; i++) { setISR(i, defaultISR); } } /**************************************************************/ Bool checkDiskReady(void) { int tries; int i; for (tries = 0; tries < 10; tries++) { for (i = 0; i < 500000; i++) { if ((*DISK_CTRL & DISK_CTRL_READY) != 0) { return TRUE; } } printf("."); } return FALSE; } unsigned long getDiskSize(void) { return *DISK_CAP; } Bool readDisk(unsigned long sector, unsigned int count, unsigned int *addr) { unsigned int n; unsigned int *p; unsigned int i; while (count != 0) { n = count > 8 ? 8 : count; *DISK_SCT = sector; *DISK_CNT = n; *DISK_CTRL = DISK_CTRL_STRT; while ((*DISK_CTRL & DISK_CTRL_DONE) == 0) ; if (*DISK_CTRL & DISK_CTRL_ERR) { return FALSE; } p = DISK_BUFFER; for (i = 0; i < n * SECTOR_SIZE / sizeof(unsigned int); i++) { *addr++ = *p++; } sector += n; count -= n; } return TRUE; } /**************************************************************/ void main(void) { unsigned long numSectors; unsigned int buffer[SECTOR_SIZE / sizeof(unsigned int)]; int i, j; unsigned char *p, *q; unsigned char c; /* init interrupts */ initInterrupts(); /* check disk ready */ if (!checkDiskReady()) { error("disk not ready"); } /* determine disk size */ numSectors = getDiskSize(); printf("Disk has %lu (0x%lX) sectors.\n", numSectors, numSectors); if (numSectors < 32) { error("disk is too small"); } /* read master boot record */ if (!readDisk(0, 1, buffer)) { error("cannot read master boot record from disk"); } /* dump master boot record */ p = (unsigned char *) buffer; for (i = 0; i < 32; i++) { printf("%08X: ", i * 16); q = p; for (j = 0; j < 16; j++) { c = *q++; printf("%02X ", c); } printf(" "); q = p; for (j = 0; j < 16; j++) { c = *q++; if (c >= 32 && c <= 126) { printf("%c", c); } else { printf("."); } } printf("\n"); p = q; } /* done */ printf("Halting...\n"); }
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