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-rw-r--r--src/libpart/prep.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/src/libpart/prep.c b/src/libpart/prep.c
new file mode 100644
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--- /dev/null
+++ b/src/libpart/prep.c
@@ -0,0 +1,216 @@
+/*
+ * <prep.c>
+ *
+ * Open Hack'Ware PREP BIOS partition type management
+ *
+ * Copyright (c) 2004-2005 Jocelyn Mayer
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License V2
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "bios.h"
+#include "libpart.h"
+
+/* PREP image management */
+typedef struct MSDOS_part_t MSDOS_part_t;
+struct MSDOS_part_t {
+ uint8_t boot_ind;
+ uint8_t start_head;
+ uint8_t start_sect;
+ uint8_t start_cyl;
+ uint8_t sys_ind;
+ uint8_t end_head;
+ uint8_t end_sect;
+ uint8_t end_cyl;
+ uint32_t LBA_start;
+ uint32_t LBA_end;
+} __attribute__ ((packed));
+
+part_t *PREP_find_partition (bloc_device_t *bd)
+{
+ MSDOS_part_t *p;
+ part_t *part;
+ uint8_t *buffer;
+ uint32_t boot_offset, boot_size;
+ int i;
+
+ part = NULL;
+ buffer = malloc(0x200);
+ bd_seek(bd, 0, 0);
+ if (bd_read(bd, buffer, 0x200) < 0) {
+ ERROR("Unable to read boot sector from boot device. Aborting...\n");
+ goto error;
+ }
+ if (buffer[0x1FE] != 0x55 || buffer[0x1FF] != 0xAA) {
+ ERROR("No MSDOS signature (%x %x %x %x)\n",
+ buffer[0x000], buffer[0x001], buffer[0x1FE], buffer[0x1FF]);
+ goto error;
+ }
+ for (i = 0; i < 4; i++) {
+ p = (void *)(&buffer[0x1BE + (0x10 * i)]);
+ DPRINTF("partition %d: %x is %sbootable - ", i, p->boot_ind,
+ (p->boot_ind & 0x80) ? "" : "not ");
+ DPRINTF("start %0x end %0x type %x\n",
+ get_le32(&p->LBA_start), get_le32(&p->LBA_end), p->sys_ind);
+#if 0
+ if (p->boot_ind != 0x80)
+ continue;
+#endif
+ switch (p->sys_ind) {
+ case 0x07: /* HPFS/NTFS */
+ goto register_nonboot;
+ case 0x08: /* AIX */
+ goto register_nonboot;
+ case 0x09: /* AIX bootable */
+ /* Not supported by now */
+ break;
+ case 0x0A: /* OS/2 boot manager */
+ /* Not supported by now */
+ break;
+ case 0x41: /* PREP boot */
+ part = malloc(sizeof(part_t));
+ memset(part, 0, sizeof(part_t));
+ part->bd = bd;
+ part_set_blocsize(bd, part, 0x200);
+ /* Convert start and size into LBA */
+ if ((p->start_head != 0 || p->start_cyl != 0 ||
+ p->start_sect != 0) && p->LBA_start == 0) {
+ DPRINTF("start: use CHS\n");
+ part->start = bd_CHS2sect(bd, p->start_cyl,
+ p->start_head,
+ p->start_sect);
+ } else {
+ DPRINTF("start: use LBA\n");
+ part->start = get_le32(&p->LBA_start);
+ }
+ if ((p->end_head != 0 || p->end_cyl != 0 ||
+ p->end_sect != 0) && p->LBA_end == 0) {
+ DPRINTF("end: use CHS\n");
+ part->size = bd_CHS2sect(bd, p->end_cyl,
+ p->end_head, p->end_sect);
+ } else {
+ DPRINTF("end: use LBA\n");
+ part->size = get_le32(&p->LBA_end);
+ }
+ /* XXX: seems that some (AIX !)
+ * code the size here instead of partition end
+ */
+ if (part->size > part->start)
+ part->size -= part->start;
+ DPRINTF("LBA: start %0x size: %0x\n", part->start, part->size);
+ /* Now, find and check boot record */
+ part_seek(part, 0, 0);
+ if (bd_read(bd, buffer, part->bloc_size) < 0) {
+ ERROR("%s sector_read failed (%d)\n", __func__, i);
+ freep(&part);
+ goto error;
+ }
+#if 0
+ if (buffer[0x1FE] != 0x55 || buffer[0x1FF] != 0xAA) {
+ ERROR("No MSDOS signature on PREP boot record\n");
+ freep(&part);
+ goto error;
+ }
+#endif
+ boot_offset = get_le32(buffer);
+ boot_size = get_le32(buffer + 4);
+ if ((boot_offset & 3) || /*(boot_size & 3) ||*/
+ boot_offset == 0 || boot_size == 0) {
+ DPRINTF("Suspicious PREP boot parameters: %08x %08x %08x %08x\n",
+ part->start, part->start * 0x200, boot_offset, boot_size);
+#if 0
+ freep(&part);
+ goto error;
+#else
+ /* IBM boot blocs respect the norm better than others... */
+ part->start++;
+ part_seek(part, 0, 0);
+ if (bd_read(bd, buffer, part->bloc_size) < 0) {
+ ERROR("%s sector_read failed (%d)\n", __func__, i);
+ freep(&part);
+ goto error;
+ }
+ boot_offset = get_le32(buffer);
+ boot_size = get_le32(buffer + 4);
+#endif
+ }
+ DPRINTF("PREP boot parameters: %08x %08x %08x %08x\n",
+ part->start, part->start * 0x200, boot_offset, boot_size);
+ if (boot_size > (part->size * part->bloc_size)) {
+ ERROR("PREP boot image greater than boot partition: %0x %0x\n",
+ boot_size, part->size * part->bloc_size);
+#if 0
+ freep(&part);
+ goto error;
+#endif
+ }
+ part->boot_start.bloc = 0;
+ part->boot_start.offset = 0;
+ part->boot_size.bloc = boot_size / part->bloc_size;
+ part->boot_size.offset = boot_size % part->bloc_size;
+ part->boot_load = 0;
+ part->boot_entry = boot_offset - part->bloc_size;
+ part->flags = PART_TYPE_PREP | PART_FLAG_BOOT;
+ part_register(bd, part, "PREP boot");
+ fs_raw_set_bootfile(part, part->boot_start.bloc,
+ part->boot_start.offset,
+ part->boot_size.bloc,
+ part->boot_size.offset);
+ break;
+ case 0x63: /* GNU Hurd */
+ goto register_nonboot;
+ case 0x83: /* Linux */
+ goto register_nonboot;
+ case 86 ... 87: /* NFTS volume set */
+ /* Not supported by now */
+ break;
+ case 0x8E: /* Linux LVM */
+ /* Not supported by now */
+ break;
+ case 0x96: /* AIX seems to use this to identify ISO 9660 'partitions' */
+ break;
+ case 0xA5: /* FreeBSD */
+ goto register_nonboot;
+ case 0xA6: /* OpenBSD */
+ goto register_nonboot;
+ case 0xA7: /* NeXTSTEP */
+ goto register_nonboot;
+ case 0xA8: /* Darwin UFS */
+ goto register_nonboot;
+ case 0xA9: /* NetBSD */
+ goto register_nonboot;
+ case 0xAB: /* Darwin boot */
+ /* Not supported by now */
+ break;
+ case 0xBE: /* Solaris boot */
+ /* Not supported by now */
+ break;
+ case 0xEB: /* BeOS fs */
+ goto register_nonboot;
+ case 0xFD: /* Linux RAID */
+ /* Not supported by now */
+ break;
+ default:
+ break;
+ register_nonboot:
+ break;
+ }
+ }
+ error:
+ free(buffer);
+
+ return part;
+}
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