Changeset 55dbaeb in mainline for uspace/app/mkexfat/mkexfat.c

Timestamp:

2012-02-21T20:02:38Z (13 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

dabe1664

Parents:

e15f4d5

Message:

mkexfat: Initialize and write the Main Extended Boot Sector to disk.

File:

• uspace/app/mkexfat/mkexfat.c (modified) (3 diffs)

uspace/app/mkexfat/mkexfat.c

@@ -53 +53 @@
 #define FAT_SECTOR_START 128
 
+/** First sector of the Main Extended Boot Region */
+#define EBS_SECTOR_START 1
+
+/** Size of the Main Extended Boot Region */
+#define EBS_SIZE 8
+
 /** Divide and round up. */
 #define div_round_up(a, b) (((a) + (b) - 1) / (b))
@@ -178 +184 @@
 }
 
+/** Write the Main Extended Boot Sector to disk
+ *
+ * @param service_id  The service id.
+ * @param cfg  Pointer to the exFAT configuration structure.
+ * @return  EOK on success or a negative error code.
+ */
+static int
+ebs_write(service_id_t service_id, exfat_cfg_t *cfg)
+{
+        uint32_t *ebs = calloc(cfg->sector_size, sizeof(uint8_t));
+        int i, rc;
+
+        if (!ebs)
+                return ENOMEM;
+
+        ebs[cfg->sector_size / 4 - 1] = host2uint32_t_le(0xAA550000);
+
+        for (i = 0; i < EBS_SIZE; ++i) {
+                rc = block_write_direct(service_id, i + EBS_SECTOR_START,
+                    1, ebs);
+
+                if (rc != EOK)
+                        goto exit;
+        }
+
+exit:
+        free(ebs);
+        return rc;
+}
+
 /** Writes the FAT on disk.
  *
@@ -304 +340 @@
         }
 
+        rc = ebs_write(service_id, &cfg);
+        if (rc != EOK) {
+                printf(NAME ": Error, failed to write the Main Extended Boot" \
+                    " Sector to disk\n");
+                return 2;
+        }
+
         rc = fat_write(service_id, &cfg);
         if (rc != EOK) {
-                printf(NAME ": Error, failed to write the FAT on disk\n");
+                printf(NAME ": Error, failed to write the FAT to disk\n");
                 return 2;
         }