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comparison io.c @ 52:51b437557f42

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boot without disk image dir -e on other directory
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sun, 22 Jul 2018 15:52:39 +0900
parents 947cbecdd8d5
children fe88cea67ef0
comparison
equal deleted inserted replaced
51:498b6fcaf270 52:51b437557f42
329 return; 329 return;
330 } 330 }
331 int drv = mem[IOPAGE+0x41]; 331 int drv = mem[IOPAGE+0x41];
332 int lsn = (mem[IOPAGE+0x42]<<16) + (mem[IOPAGE+0x43]<<8) + mem[IOPAGE+0x44]; 332 int lsn = (mem[IOPAGE+0x42]<<16) + (mem[IOPAGE+0x43]<<8) + mem[IOPAGE+0x44];
333 int buf = (mem[IOPAGE+0x45]<<8) + mem[IOPAGE+0x46]; 333 int buf = (mem[IOPAGE+0x45]<<8) + mem[IOPAGE+0x46];
334 if (drv > 1 || disk[drv]==0) goto error;
335 Byte *phy = pmem(buf); 334 Byte *phy = pmem(buf);
336 if (c==0x81) { 335 if (c==0x81) {
336 if (drv > 1 || disk[drv]==0) goto error;
337 if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error; 337 if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error;
338 if (read(fileno(disk[drv]),phy,SECSIZE)==-1) goto error; 338 if (read(fileno(disk[drv]),phy,SECSIZE)==-1) goto error;
339 } else if (c==0x55) { 339 } else if (c==0x55) {
340 if (drv > 1 || disk[drv]==0) goto error;
340 if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error; 341 if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error;
341 if (write(fileno(disk[drv]),phy,SECSIZE)==-1) goto error; 342 if (write(fileno(disk[drv]),phy,SECSIZE)==-1) goto error;
342 #ifdef USE_VDISK 343 #ifdef USE_VDISK
343 } else { 344 } else {
344 do_vdisk(c); 345 do_vdisk(c);