add directory Linux-0.98

Linux-0.98/INSTALL/pfdisk/S_MSDOS.C

@@ -0,0 +1,163 @@
+/* This file contains system-specific functions for MS-DOS.
+ * The program pfdisk.c calls these routines.
+ */
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dos.h>
+
+#define extern
+#include "sysdep.h"
+#undef extern
+
+int usage(prog)	/* print a usage message */
+char	*prog;	/* program name */
+{
+  fprintf(stderr,"Usage: %s <disk>\n", prog);
+  fprintf(stderr,"\twhere <disk> is a digit [0-9]\n");
+}
+
+void getGeometry(name, c, h, s)
+char	*name;		/* device name */
+unsigned *c,*h,*s;	/* cyls, heads, sectors */
+{
+  int dev;	/* hard disk number */
+  union 	REGS	regs;
+  struct	SREGS	sregs;
+  
+  if (name[0] < '0' ||
+      name[0] > '9' ||
+      name[1] != 0  )
+    {
+      fprintf(stderr,"%s: device name must be a digit\n", name);
+      return;
+    }
+  dev = (name[0] - '0');
+  
+  regs.h.ah = 8;		/* get param.	*/
+  regs.h.dl = dev | 0x80;
+  
+  int86x(0x13,&regs,&regs,&sregs);
+  
+  /* Are that many drives responding? */
+  if (regs.h.dl <= dev ) {
+    fprintf(stderr,"%s: drive not found\n", name);
+    return;
+  }
+  if (regs.x.cflag) {
+    fprintf(stderr,"%s: can't get disk parameters\n", name);
+    return;
+  }
+  *c = ((((int) regs.h.cl << 2) & 0x300) | regs.h.ch) + 1;
+  *h = regs.h.dh + 1;
+  *s = regs.h.cl & 0x3F;
+}
+
+int getFile(name, buf, len)	/* read file into buffer */
+char	*name, *buf;
+int	len;
+{	/* (open, read, close) */
+  int devfd, retval;
+  
+  devfd = open(name, O_RDONLY|O_BINARY, 0);
+  if (devfd < 0) {
+    fprintf(stderr,"%s: can't open for reading\n", name);
+    return(devfd);
+  }
+  retval = read(devfd, buf, len);
+  if (retval < 0)
+    fprintf(stderr,"%s: read failed\n", name);
+  close(devfd);
+  return(retval);
+}
+
+int putFile(name, buf, len)	/* write buffer to file */
+char	*name, *buf;
+int	len;
+{	/* (open, write, close) */
+  int devfd, retval;
+  
+  devfd = open(name,
+	       O_WRONLY|O_CREAT|O_BINARY,
+	       S_IREAD|S_IWRITE ); /* stupid DOS... */
+  if (devfd < 0) {
+    fprintf(stderr,"%s: can't open for writing\n", name);
+    return(devfd);
+  }
+  retval = write(devfd, buf, len);
+  if (retval < 0)
+    fprintf(stderr,"%s: write failed\n", name);
+  close(devfd);
+  return(retval);
+}
+
+int getBBlk(name, buf)	/* read boot block into buffer */
+char	*name, *buf;
+{	/* BIOS absolute disk read */
+  int dev;
+  union 	REGS	regs;
+  struct	SREGS	sregs;
+  
+  if (name[0] < '0' ||
+      name[0] > '9' ||
+      name[1] != 0  )
+    {
+      fprintf(stderr,"%s: device name must be a digit\n",name);
+      return(-1);
+    }
+  dev = (name[0] - '0');
+  
+  segread(&sregs);	/* get ds */
+  sregs.es = sregs.ds;	/* buffer address */
+  regs.x.bx = (int) buf;
+  
+  regs.h.ah = 2;		/* read		*/
+  regs.h.al = 1;		/* sector count	*/
+  regs.h.ch = 0;		/* track	*/
+  regs.h.cl = 1;		/* start sector	*/
+  regs.h.dh = 0;		/* head		*/
+  regs.h.dl = dev|0x80;	/* drive	*/
+  
+  int86x(0x13,&regs,&regs,&sregs);
+  if (regs.x.cflag) {
+    fprintf(stderr,"%s: read failed\n", name);
+    return(-1);
+  }
+  return(SECSIZE);
+}
+
+int putBBlk(name, buf)	/* write buffer to boot block */
+char	*name, *buf;
+{	/* BIOS absolute disk write */
+  int dev;
+  union 	REGS	regs;
+  struct	SREGS	sregs;
+  
+  if (name[0] < '0' ||
+      name[0] > '9' ||
+      name[1] != 0  )
+    {
+      fprintf(stderr,"%s: device name must be a digit\n", name);
+      return(-1);
+    }
+  dev = (name[0] - '0');
+  
+  segread(&sregs);	/* get ds */
+  sregs.es = sregs.ds;	/* buffer address */
+  regs.x.bx = (int) buf;
+  
+  regs.h.ah = 3;		/* write	*/
+  regs.h.al = 1;		/* sector count	*/
+  regs.h.ch = 0;		/* track	*/
+  regs.h.cl = 1;		/* start sector	*/
+  regs.h.dh = 0;		/* head		*/
+  regs.h.dl = dev|0x80;	/* drive	*/
+  
+  int86x(0x13,&regs,&regs,&sregs);
+  if (regs.x.cflag) {
+    fprintf(stderr,"%s: write failed\n",name);
+    return(-1);
+  }
+  return(SECSIZE);
+}