diff options
Diffstat (limited to 'lib/libdisk/write_i386_disk.c')
| -rw-r--r-- | lib/libdisk/write_i386_disk.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/lib/libdisk/write_i386_disk.c b/lib/libdisk/write_i386_disk.c new file mode 100644 index 0000000..15808c8 --- /dev/null +++ b/lib/libdisk/write_i386_disk.c @@ -0,0 +1,196 @@ +/* + * ---------------------------------------------------------------------------- + * "THE BEER-WARE LICENSE" (Revision 42): + * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you + * can do whatever you want with this stuff. If we meet some day, and you think + * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp + * ---------------------------------------------------------------------------- + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/disklabel.h> +#include <sys/diskslice.h> +#include <sys/diskmbr.h> +#include <paths.h> +#include "libdisk.h" + +/* XXX: A lot of hardcoded 512s probably should be foo->sector_size; + I'm not sure which, so I leave it like it worked before. --schweikh */ +static int +Write_FreeBSD(int fd, const struct disk *new, const struct disk *old, const struct chunk *c1) +{ + struct disklabel *dl; + int i; + void *p; + u_char buf[BBSIZE]; + + for(i = 0; i < BBSIZE/512; i++) { + p = read_block(fd, i + c1->offset, 512); + memcpy(buf + 512 * i, p, 512); + free(p); + } + if(new->boot1) + memcpy(buf, new->boot1, 512); + + if(new->boot2) + memcpy(buf + 512, new->boot2, BBSIZE-512); + + dl = (struct disklabel *)(buf + 512 * LABELSECTOR + LABELOFFSET); + Fill_Disklabel(dl, new, old, c1); + + + for(i=0;i<BBSIZE/512;i++) { + write_block(fd, i + c1->offset, buf + 512 * i, 512); + } + + return 0; +} + +static void +Write_Int32(u_int32_t *p, u_int32_t v) +{ + u_int8_t *bp = (u_int8_t *)p; + bp[0] = (v >> 0) & 0xff; + bp[1] = (v >> 8) & 0xff; + bp[2] = (v >> 16) & 0xff; + bp[3] = (v >> 24) & 0xff; +} + +/* + * Special install-time configuration for the i386 boot0 boot manager. + */ +static void +Cfg_Boot_Mgr(u_char *mbr, int edd) +{ + if (mbr[0x1b0] == 0x66 && mbr[0x1b1] == 0xbb) { + if (edd) + mbr[0x1bb] |= 0x80; /* Packet mode on */ + else + mbr[0x1bb] &= 0x7f; /* Packet mode off */ + } +} + +int +Write_Disk(const struct disk *d1) +{ + int fd,i; + int j; + struct disk *old = 0; + struct chunk *c1; + int ret = 0; + char device[64]; + u_char *mbr; + struct dos_partition *dp,work[NDOSPART]; + int s[4]; + int need_edd = 0; /* Need EDD (packet interface) */ + + strcpy(device,_PATH_DEV); + strcat(device,d1->name); + + + fd = open(device,O_RDWR); + if (fd < 0) + return 1; + + memset(s,0,sizeof s); + mbr = read_block(fd, 0, d1->sector_size); + dp = (struct dos_partition*)(mbr + DOSPARTOFF); + memcpy(work, dp, sizeof work); + dp = work; + free(mbr); + for (c1 = d1->chunks->part; c1; c1 = c1->next) { + if (c1->type == unused) continue; + if (!strcmp(c1->name, "X")) continue; + j = c1->name[strlen(d1->name) + 1] - '1'; + if (j < 0 || j > 3) + continue; + s[j]++; + if (c1->type == freebsd) + ret += Write_FreeBSD(fd, d1, old, c1); + + Write_Int32(&dp[j].dp_start, c1->offset); + Write_Int32(&dp[j].dp_size, c1->size); + + i = c1->offset; + if (i >= 1024*d1->bios_sect*d1->bios_hd) { + dp[j].dp_ssect = 0xff; + dp[j].dp_shd = 0xff; + dp[j].dp_scyl = 0xff; + need_edd++; + } else { + dp[j].dp_ssect = i % d1->bios_sect; + i -= dp[j].dp_ssect++; + i /= d1->bios_sect; + dp[j].dp_shd = i % d1->bios_hd; + i -= dp[j].dp_shd; + i /= d1->bios_hd; + dp[j].dp_scyl = i; + i -= dp[j].dp_scyl; + dp[j].dp_ssect |= i >> 2; + } + +#ifdef DEBUG + printf("S:%lu = (%x/%x/%x)", + c1->offset, dp[j].dp_scyl, dp[j].dp_shd, dp[j].dp_ssect); +#endif + + i = c1->end; + dp[j].dp_esect = i % d1->bios_sect; + i -= dp[j].dp_esect++; + i /= d1->bios_sect; + dp[j].dp_ehd = i % d1->bios_hd; + i -= dp[j].dp_ehd; + i /= d1->bios_hd; + if (i>1023) i = 1023; + dp[j].dp_ecyl = i; + i -= dp[j].dp_ecyl; + dp[j].dp_esect |= i >> 2; + +#ifdef DEBUG + printf(" E:%lu = (%x/%x/%x)\n", + c1->end, dp[j].dp_ecyl, dp[j].dp_ehd, dp[j].dp_esect); +#endif + + dp[j].dp_typ = c1->subtype; + if (c1->flags & CHUNK_ACTIVE) + dp[j].dp_flag = 0x80; + else + dp[j].dp_flag = 0; + } + j = 0; + for(i = 0; i < NDOSPART; i++) { + if (!s[i]) + memset(dp + i, 0, sizeof *dp); + if (dp[i].dp_flag) + j++; + } + if (!j) + for(i = 0; i < NDOSPART; i++) + if (dp[i].dp_typ == 0xa5) + dp[i].dp_flag = 0x80; + + mbr = read_block(fd, 0, d1->sector_size); + if (d1->bootmgr) { + memcpy(mbr, d1->bootmgr, DOSPARTOFF); + Cfg_Boot_Mgr(mbr, need_edd); + } + memcpy(mbr + DOSPARTOFF, dp, sizeof *dp * NDOSPART); + mbr[512-2] = 0x55; + mbr[512-1] = 0xaa; + write_block(fd, 0, mbr, d1->sector_size); + if (d1->bootmgr && d1->bootmgr_size > d1->sector_size) + for(i = 1; i * d1->sector_size <= d1->bootmgr_size; i++) + write_block(fd, i, &d1->bootmgr[i * d1->sector_size], d1->sector_size); + + close(fd); + return 0; +} |
