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Diffstat (limited to 'libdiskconfig/config_mbr.c')
-rw-r--r--libdiskconfig/config_mbr.c325
1 files changed, 0 insertions, 325 deletions
diff --git a/libdiskconfig/config_mbr.c b/libdiskconfig/config_mbr.c
deleted file mode 100644
index c168c78..0000000
--- a/libdiskconfig/config_mbr.c
+++ /dev/null
@@ -1,325 +0,0 @@
-/* libs/diskconfig/diskconfig.c
- *
- * Copyright 2008, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define LOG_TAG "config_mbr"
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-#include <cutils/log.h>
-
-#include "diskconfig.h"
-
-
-/* start and len are in LBA units */
-static void
-cfg_pentry(struct pc_partition *pentry, uint8_t status, uint8_t type,
- uint32_t start, uint32_t len)
-{
- if (len > 0) {
- /* seems that somes BIOSens can get wedged on boot while verifying
- * the mbr if these are 0 */
- memset(&pentry->start, 0xff, sizeof(struct chs));
- memset(&pentry->end, 0xff, sizeof(struct chs));
- } else {
- /* zero out the c/h/s entries.. they are not used */
- memset(&pentry->start, 0, sizeof(struct chs));
- memset(&pentry->end, 0, sizeof(struct chs));
- }
-
- pentry->status = status;
- pentry->type = type;
- pentry->start_lba = start;
- pentry->len_lba = len;
-
- LOGI("Configuring pentry. status=0x%x type=0x%x start_lba=%u len_lba=%u",
- pentry->status, pentry->type, pentry->start_lba, pentry->len_lba);
-}
-
-
-static inline uint32_t
-kb_to_lba(uint32_t len_kb, uint32_t sect_size)
-{
- uint64_t lba;
-
- lba = (uint64_t)len_kb * 1024;
- /* bump it up to the next LBA boundary just in case */
- lba = (lba + (uint64_t)sect_size - 1) & ~((uint64_t)sect_size - 1);
- lba /= (uint64_t)sect_size;
- if (lba >= 0xffffffffULL)
- LOGE("Error converting kb -> lba. 32bit overflow, expect weirdness");
- return (uint32_t)(lba & 0xffffffffULL);
-}
-
-
-static struct write_list *
-mk_pri_pentry(struct disk_info *dinfo, struct part_info *pinfo, int pnum,
- uint32_t *lba)
-{
- struct write_list *item;
- struct pc_partition *pentry;
-
- if (pnum >= PC_NUM_BOOT_RECORD_PARTS) {
- LOGE("Maximum number of primary partition exceeded.");
- return NULL;
- }
-
- if (!(item = alloc_wl(sizeof(struct pc_partition)))) {
- LOGE("Unable to allocate memory for partition entry.");
- return NULL;
- }
-
- {
- /* DO NOT DEREFERENCE */
- struct pc_boot_record *mbr = (void *)PC_MBR_DISK_OFFSET;
- /* grab the offset in mbr where to write this partition entry. */
- item->offset = (loff_t)((uint32_t)((uint8_t *)(&mbr->ptable[pnum])));
- }
-
- pentry = (struct pc_partition *) &item->data;
-
- /* need a standard primary partition entry */
- if (pinfo) {
- /* need this to be 64 bit in case len_kb is large */
- uint64_t len_lba;
-
- if (pinfo->len_kb != (uint32_t)-1) {
- /* bump it up to the next LBA boundary just in case */
- len_lba = ((uint64_t)pinfo->len_kb * 1024);
- len_lba += ((uint64_t)dinfo->sect_size - 1);
- len_lba &= ~((uint64_t)dinfo->sect_size - 1);
- len_lba /= (uint64_t)dinfo->sect_size;
- } else {
- /* make it fill the rest of disk */
- len_lba = dinfo->num_lba - *lba;
- }
-
- cfg_pentry(pentry, ((pinfo->flags & PART_ACTIVE_FLAG) ?
- PC_PART_ACTIVE : PC_PART_NORMAL),
- pinfo->type, *lba, (uint32_t)len_lba);
-
- pinfo->start_lba = *lba;
- *lba += (uint32_t)len_lba;
- } else {
- /* this should be made an extended partition, and should take
- * up the rest of the disk as a primary partition */
- cfg_pentry(pentry, PC_PART_NORMAL, PC_PART_TYPE_EXTENDED,
- *lba, dinfo->num_lba - *lba);
-
- /* note that we do not update the *lba because we now have to
- * create a chain of extended partition tables, and first one is at
- * *lba */
- }
-
- return item;
-}
-
-
-/* This function configures an extended boot record at the beginning of an
- * extended partition. This creates a logical partition and a pointer to
- * the next EBR.
- *
- * ext_lba == The start of the toplevel extended partition (pointed to by the
- * entry in the MBR).
- */
-static struct write_list *
-mk_ext_pentry(struct disk_info *dinfo, struct part_info *pinfo, uint32_t *lba,
- uint32_t ext_lba, struct part_info *pnext)
-{
- struct write_list *item;
- struct pc_boot_record *ebr;
- uint32_t len; /* in lba units */
-
- if (!(item = alloc_wl(sizeof(struct pc_boot_record)))) {
- LOGE("Unable to allocate memory for EBR.");
- return NULL;
- }
-
- /* we are going to write the ebr at the current LBA, and then bump the
- * lba counter since that is where the logical data partition will start */
- item->offset = (*lba) * dinfo->sect_size;
- (*lba)++;
-
- ebr = (struct pc_boot_record *) &item->data;
- memset(ebr, 0, sizeof(struct pc_boot_record));
- ebr->mbr_sig = PC_BIOS_BOOT_SIG;
-
- if (pinfo->len_kb != (uint32_t)-1)
- len = kb_to_lba(pinfo->len_kb, dinfo->sect_size);
- else {
- if (pnext) {
- LOGE("Only the last partition can be specified to fill the disk "
- "(name = '%s')", pinfo->name);
- goto fail;
- }
- len = dinfo->num_lba - *lba;
- /* update the pinfo structure to reflect the new size, for
- * bookkeeping */
- pinfo->len_kb =
- (uint32_t)(((uint64_t)len * (uint64_t)dinfo->sect_size) /
- ((uint64_t)1024));
- }
-
- cfg_pentry(&ebr->ptable[PC_EBR_LOGICAL_PART], PC_PART_NORMAL,
- pinfo->type, 1, len);
-
- pinfo->start_lba = *lba;
- *lba += len;
-
- /* If this is not the last partition, we have to create a link to the
- * next extended partition.
- *
- * Otherwise, there's nothing to do since the "pointer entry" is
- * already zero-filled.
- */
- if (pnext) {
- /* The start lba for next partition is an offset from the beginning
- * of the top-level extended partition */
- uint32_t next_start_lba = *lba - ext_lba;
- uint32_t next_len_lba;
- if (pnext->len_kb != (uint32_t)-1)
- next_len_lba = 1 + kb_to_lba(pnext->len_kb, dinfo->sect_size);
- else
- next_len_lba = dinfo->num_lba - *lba;
- cfg_pentry(&ebr->ptable[PC_EBR_NEXT_PTR_PART], PC_PART_NORMAL,
- PC_PART_TYPE_EXTENDED, next_start_lba, next_len_lba);
- }
-
- return item;
-
-fail:
- free_wl(item);
- return NULL;
-}
-
-
-struct write_list *
-config_mbr(struct disk_info *dinfo)
-{
- struct part_info *pinfo;
- uint32_t cur_lba = dinfo->skip_lba;
- uint32_t ext_lba = 0;
- struct write_list *wr_list = NULL;
- struct write_list *temp_wr = NULL;
- int cnt = 0;
- int extended = 0;
-
- if (!dinfo->part_lst)
- return NULL;
-
- for (cnt = 0; cnt < dinfo->num_parts; ++cnt) {
- pinfo = &dinfo->part_lst[cnt];
-
- /* Should we create an extedned partition? */
- if (cnt == (PC_NUM_BOOT_RECORD_PARTS - 1)) {
- if (cnt + 1 < dinfo->num_parts) {
- extended = 1;
- ext_lba = cur_lba;
- if ((temp_wr = mk_pri_pentry(dinfo, NULL, cnt, &cur_lba)))
- wlist_add(&wr_list, temp_wr);
- else {
- LOGE("Cannot create primary extended partition.");
- goto fail;
- }
- }
- }
-
- /* if extended, need 1 lba for ebr */
- if ((cur_lba + extended) >= dinfo->num_lba)
- goto nospace;
- else if (pinfo->len_kb != (uint32_t)-1) {
- uint32_t sz_lba = (pinfo->len_kb / dinfo->sect_size) * 1024;
- if ((cur_lba + sz_lba + extended) > dinfo->num_lba)
- goto nospace;
- }
-
- if (!extended)
- temp_wr = mk_pri_pentry(dinfo, pinfo, cnt, &cur_lba);
- else {
- struct part_info *pnext;
- pnext = cnt + 1 < dinfo->num_parts ? &dinfo->part_lst[cnt+1] : NULL;
- temp_wr = mk_ext_pentry(dinfo, pinfo, &cur_lba, ext_lba, pnext);
- }
-
- if (temp_wr)
- wlist_add(&wr_list, temp_wr);
- else {
- LOGE("Cannot create partition %d (%s).", cnt, pinfo->name);
- goto fail;
- }
- }
-
- /* fill in the rest of the MBR with empty parts (if needed). */
- for (; cnt < PC_NUM_BOOT_RECORD_PARTS; ++cnt) {
- struct part_info blank;
- cur_lba = 0;
- memset(&blank, 0, sizeof(struct part_info));
- if (!(temp_wr = mk_pri_pentry(dinfo, &blank, cnt, &cur_lba))) {
- LOGE("Cannot create blank partition %d.", cnt);
- goto fail;
- }
- wlist_add(&wr_list, temp_wr);
- }
-
- return wr_list;
-
-nospace:
- LOGE("Not enough space to add parttion '%s'.", pinfo->name);
-
-fail:
- wlist_free(wr_list);
- return NULL;
-}
-
-
-/* Returns the device path of the partition referred to by 'name'
- * Must be freed by the caller.
- */
-char *
-find_mbr_part(struct disk_info *dinfo, const char *name)
-{
- struct part_info *plist = dinfo->part_lst;
- int num = 0;
- char *dev_name = NULL;
- int has_extended = (dinfo->num_parts > PC_NUM_BOOT_RECORD_PARTS);
-
- for(num = 1; num <= dinfo->num_parts; ++num) {
- if (!strcmp(plist[num-1].name, name))
- break;
- }
-
- if (num > dinfo->num_parts)
- return NULL;
-
- if (has_extended && (num >= PC_NUM_BOOT_RECORD_PARTS))
- num++;
-
- if (!(dev_name = malloc(MAX_NAME_LEN))) {
- LOGE("Cannot allocate memory.");
- return NULL;
- }
-
- num = snprintf(dev_name, MAX_NAME_LEN, "%s%d", dinfo->device, num);
- if (num >= MAX_NAME_LEN) {
- LOGE("Device name is too long?!");
- free(dev_name);
- return NULL;
- }
-
- return dev_name;
-}
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