diff options
Diffstat (limited to 'sys/i386/boot/dosboot/dosboot.c')
| -rw-r--r-- | sys/i386/boot/dosboot/dosboot.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/sys/i386/boot/dosboot/dosboot.c b/sys/i386/boot/dosboot/dosboot.c new file mode 100644 index 0000000..b3b0bc8 --- /dev/null +++ b/sys/i386/boot/dosboot/dosboot.c @@ -0,0 +1,192 @@ +/*
+ * dosboot.c Boot FreeBSD from DOS partition
+ *
+ * (C) 1994 by Christian Gusenbauer (cg@fimp01.fim.uni-linz.ac.at)
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * I ALLOW YOU USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. I DISCLAIM
+ * ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE
+ * USE OF THIS SOFTWARE.
+ *
+ * Parts of this file are
+ * Copyright (c) 1992, 1991 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+#include <bios.h>
+#include <stdio.h>
+#include <process.h>
+
+#include "protmod.h"
+#include "param.h"
+#include "boot.h"
+#include "bootinfo.h"
+#include "reboot.h"
+
+#include "exec.h"
+
+#define BUFSIZE 4096
+
+static struct exec head;
+static long argv[10];
+static long startaddr;
+
+int biosread(int dev, int track, int head, int sector, int cnt, unsigned char far *buffer)
+{
+ struct _diskinfo_t di;
+ int r;
+
+ di.drive = dev; /* first hard disk */
+ di.head = head; /* head # */
+ di.track = track; /* track # */
+ di.sector = sector+1; /* sector # */
+ di.nsectors = cnt; /* only 1 sector */
+ di.buffer = (void far *) buffer; /* sector buffer */
+ r= _bios_disk(_DISK_READ, &di);
+ return r&0xFF00;
+}
+
+static void dosxread(FILE *fp, unsigned long addr, long size)
+{
+ extern char buf[BUFSIZE];
+
+ int count = BUFSIZE;
+ while (size > 0l) {
+ if (BUFSIZE > size)
+ count = (int) size;
+ fread(buf, count, 1, fp);
+ pm_copy(buf, addr, count);
+ size -= count;
+ addr += count;
+ }
+}
+
+static long loadprog(FILE *fp, int howto, long *hsize)
+{
+ long int addr; /* physical address.. not directly useable */
+ long int hmaddress;
+ static int (*x_entry)() = 0;
+
+ argv[3] = 0;
+ argv[4] = 0;
+ fread(&head, sizeof(head), 1, fp);
+ fseek(fp, 4096-sizeof(head), 1);
+ if ( N_BADMAG(head)) {
+ printf("Invalid format!\n");
+ exit(0);
+ }
+
+ poff = N_TXTOFF(head);
+
+ startaddr = (long)head.a_entry;
+ addr = (startaddr & 0x00ffffffl); /* some MEG boundary */
+ printf("Booting @ 0x%lx\n", addr);
+ if(addr < 0x100000l)
+ {
+ printf("kernel linked for wrong address!\n");
+ printf("Only hope is to link the kernel for > 1MB\n");
+ exit(0);
+ }
+
+ *hsize = head.a_text+head.a_data+head.a_bss;
+ addr=hmaddress=get_high_memory(*hsize);
+ if (!hmaddress) {
+ printf("Sorry, can't allocate enough memory!\n");
+ exit(0);
+ }
+
+ printf("text=0x%lx ", head.a_text);
+ /********************************************************/
+ /* LOAD THE TEXT SEGMENT */
+ /********************************************************/
+ dosxread(fp, addr, head.a_text);
+ addr += head.a_text;
+
+ /********************************************************/
+ /* Load the Initialised data after the text */
+ /********************************************************/
+ while (addr & CLOFSET)
+ pm_copy("\0", addr++, 1);
+
+ printf("data=0x%lx ", head.a_data);
+ dosxread(fp, addr, head.a_data);
+ addr += head.a_data;
+
+ /********************************************************/
+ /* Skip over the uninitialised data */
+ /* (but clear it) */
+ /********************************************************/
+ printf("bss=0x%lx ", head.a_bss);
+ pbzero(addr, head.a_bss);
+ argv[3] = (addr += head.a_bss);
+ argv[3] += -hmaddress+0x100000l;
+
+ /********************************************************/
+ /* and note the end address of all this */
+ /********************************************************/
+
+ addr = addr-hmaddress+0x100000l;
+ argv[4] = ((addr+(long) sizeof(long)-1l))&~((long)sizeof(long)-1l);
+ printf("total=0x%lx ",argv[4]);
+
+ /*
+ * We now pass the various bootstrap parameters to the loaded
+ * image via the argument list
+ * (THIS IS A BIT OF HISTORY FROM MACH.. LEAVE FOR NOW)
+ * arg1 = boot flags
+ * arg2 = boot device
+ * arg3 = start of symbol table (0 if not loaded)
+ * arg4 = end of symbol table (0 if not loaded)
+ * arg5 = transfer address from image
+ * arg6 = transfer address for next image pointer
+ */
+ argv[1] = howto;
+ argv[2] = (MAKEBOOTDEV(maj, (slice>>4), (slice&0xf), unit, part)) ;
+ argv[5] = (head.a_entry &= 0xfffffff);
+ argv[6] = (long) &x_entry;
+ argv[0] = 8;
+
+ printf("entry point=0x%lx\n" ,((long)startaddr) & 0xffffff);
+ return hmaddress;
+}
+
+void dosboot(int howto, char *kernel)
+{
+ long hmaddress, size;
+ FILE *fp;
+
+ fp = fopen(kernel, "rb"); /* open kernel for reading */
+ if (!fp) {
+ fprintf(stderr, "Sorry, can't open %s!\n", kernel);
+ return;
+ }
+ hmaddress = loadprog(fp, howto, &size);
+ fclose(fp);
+ startprog(hmaddress, size, (startaddr & 0xffffffl), argv);
+}
+
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