199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/disklabel.h>
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#include <sys/diskslice.h>
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#include <sys/diskmbr.h>
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#include <paths.h>
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#include "libdisk.h"
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/*
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* XXX: A lot of hardcoded 512s probably should be foo->sector_size;
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* I'm not sure which, so I leave it like it worked before. --schweikh
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*/
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static int
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Write_FreeBSD(int fd, const struct disk *new, const struct chunk *c1)
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{
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struct disklabel *dl;
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int i;
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void *p;
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u_char buf[BBSIZE];
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for (i = 0; i < BBSIZE/512; i++) {
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p = read_block(fd, i + c1->offset, 512);
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memcpy(buf + 512 * i, p, 512);
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free(p);
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}
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if (new->boot1)
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memcpy(buf, new->boot1, 512);
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if (new->boot2)
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memcpy(buf + 512, new->boot2, BBSIZE - 512);
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dl = (struct disklabel *)(buf + 512 * LABELSECTOR + LABELOFFSET);
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Fill_Disklabel(dl, new, c1);
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for (i = 0; i < BBSIZE / 512; i++)
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write_block(fd, i + c1->offset, buf + 512 * i, 512);
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return 0;
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}
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static void
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Write_Int32(u_int32_t *p, u_int32_t v)
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{
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u_int8_t *bp = (u_int8_t *)p;
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bp[0] = (v >> 0) & 0xff;
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bp[1] = (v >> 8) & 0xff;
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bp[2] = (v >> 16) & 0xff;
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bp[3] = (v >> 24) & 0xff;
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}
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/*
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* Special install-time configuration for the i386 boot0 boot manager.
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*/
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static void
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Cfg_Boot_Mgr(u_char *mbr, int edd)
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{
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if (mbr[0x1b0] == 0x66 && mbr[0x1b1] == 0xbb) {
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if (edd)
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mbr[0x1bb] |= 0x80; /* Packet mode on */
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else
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mbr[0x1bb] &= 0x7f; /* Packet mode off */
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}
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}
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int
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Write_Disk(const struct disk *d1)
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{
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int fd, j;
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uint i;
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struct chunk *c1;
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int ret = 0;
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char device[64];
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u_char *mbr;
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struct dos_partition *dp,work[NDOSPART];
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int s[4];
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int need_edd = 0; /* Need EDD (packet interface) */
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strcpy(device, _PATH_DEV);
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strcat(device, d1->name);
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fd = open(device, O_RDWR);
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if (fd < 0)
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return 1;
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memset(s, 0, sizeof s);
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mbr = read_block(fd, 0, d1->sector_size);
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dp = (struct dos_partition *)(mbr + DOSPARTOFF);
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memcpy(work, dp, sizeof work);
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dp = work;
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free(mbr);
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for (c1 = d1->chunks->part; c1; c1 = c1->next) {
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if (c1->type == unused)
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continue;
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if (!strcmp(c1->name, "X"))
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continue;
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j = c1->name[strlen(d1->name) + 1] - '1';
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if (j < 0 || j > 3)
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continue;
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s[j]++;
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if (c1->type == freebsd)
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ret += Write_FreeBSD(fd, d1, c1);
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Write_Int32(&dp[j].dp_start, c1->offset);
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Write_Int32(&dp[j].dp_size, c1->size);
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i = c1->offset;
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if (i >= 1024 * d1->bios_sect * d1->bios_hd) {
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dp[j].dp_ssect = 0xff;
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dp[j].dp_shd = 0xff;
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dp[j].dp_scyl = 0xff;
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need_edd++;
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} else {
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dp[j].dp_ssect = i % d1->bios_sect;
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i -= dp[j].dp_ssect++;
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i /= d1->bios_sect;
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dp[j].dp_shd = i % d1->bios_hd;
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i -= dp[j].dp_shd;
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i /= d1->bios_hd;
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dp[j].dp_scyl = i;
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i -= dp[j].dp_scyl;
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dp[j].dp_ssect |= i >> 2;
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}
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#ifdef DEBUG
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printf("S:%lu = (%x/%x/%x)", c1->offset,
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dp[j].dp_scyl, dp[j].dp_shd, dp[j].dp_ssect);
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#endif
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i = c1->end;
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dp[j].dp_esect = i % d1->bios_sect;
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i -= dp[j].dp_esect++;
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i /= d1->bios_sect;
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dp[j].dp_ehd = i % d1->bios_hd;
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i -= dp[j].dp_ehd;
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i /= d1->bios_hd;
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if (i > 1023)
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i = 1023;
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dp[j].dp_ecyl = i;
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i -= dp[j].dp_ecyl;
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dp[j].dp_esect |= i >> 2;
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#ifdef DEBUG
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printf(" E:%lu = (%x/%x/%x)\n", c1->end,
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dp[j].dp_ecyl, dp[j].dp_ehd, dp[j].dp_esect);
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#endif
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dp[j].dp_typ = c1->subtype;
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if (c1->flags & CHUNK_ACTIVE)
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dp[j].dp_flag = 0x80;
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else
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dp[j].dp_flag = 0;
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}
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j = 0;
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for (i = 0; i < NDOSPART; i++) {
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if (!s[i])
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memset(dp + i, 0, sizeof *dp);
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if (dp[i].dp_flag)
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j++;
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}
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if (!j)
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for(i = 0; i < NDOSPART; i++)
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if (dp[i].dp_typ == 0xa5)
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dp[i].dp_flag = 0x80;
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mbr = read_block(fd, 0, d1->sector_size);
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if (d1->bootmgr) {
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memcpy(mbr, d1->bootmgr, DOSPARTOFF);
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Cfg_Boot_Mgr(mbr, need_edd);
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}
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memcpy(mbr + DOSPARTOFF, dp, sizeof *dp * NDOSPART);
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mbr[512-2] = 0x55;
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mbr[512-1] = 0xaa;
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write_block(fd, 0, mbr, d1->sector_size);
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if (d1->bootmgr && d1->bootmgr_size > d1->sector_size)
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for (i = 1; i * d1->sector_size <= d1->bootmgr_size; i++)
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write_block(fd, i, &d1->bootmgr[i * d1->sector_size],
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d1->sector_size);
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close(fd);
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return 0;
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}
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