Changeset 9744f2d in mainline for uspace/app/mkexfat/mkexfat.c

Timestamp:

2012-02-16T22:14:42Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

39aa8ce

Parents:

acb866ae

Message:

mkexfat:

• Get the total number of blocks of the device.
• Add function to initialize the Volume Boot Record structure.

File:

• uspace/app/mkexfat/mkexfat.c (modified) (4 diffs)

uspace/app/mkexfat/mkexfat.c

@@ -42 +42 @@
 #define NAME    "mkexfat"
 
+/** First sector of the FAT */
+#define FAT_SECTOR_START 128
+
+/** Divide and round up. */
+#define div_round_up(a, b) (((a) + (b) - 1) / (b))
+
+typedef struct exfat_cfg {
+        uint64_t volume_start;
+        uint64_t volume_count;
+        uint32_t fat_sector_count;
+        uint32_t data_start_sector;
+        uint32_t data_cluster;
+        uint32_t rootdir_cluster;
+        unsigned bytes_per_sector;
+        unsigned sec_per_cluster;
+} exfat_cfg_t;
+
 static void usage(void)
 {
@@ -47 +64 @@
 }
 
+/** Initialize the exFAT params structure.
+ *
+ * @param cfg Pointer to the exFAT params structure to initialize.
+ */
+static void
+cfg_params_initialize(exfat_cfg_t *cfg)
+{
+}
+
+/** Initialize the Volume Boot Record fields.
+ *
+ * @param vbr Pointer to the Volume Boot Record structure.
+ * @param cfg Pointer to the exFAT configuration structure.
+ */
+static void
+vbr_initialize(exfat_bs_t *vbr, exfat_cfg_t *cfg)
+{
+        /* Fill the structure with zeroes */
+        memset(vbr, 0, sizeof(exfat_bs_t));
+
+        /* Init Jump Boot section */
+        vbr->jump[0] = 0xEB;
+        vbr->jump[1] = 0x76;
+        vbr->jump[2] = 0x90;
+
+        /* Set the filesystem name */
+        memcpy(vbr->oem_name, "EXFAT   ", sizeof(vbr->oem_name));
+
+        vbr->volume_start = host2uint64_t_le(cfg->volume_start);
+        vbr->volume_count = host2uint64_t_le(cfg->volume_count);
+        vbr->fat_sector_start = host2uint32_t_le(FAT_SECTOR_START);
+        vbr->fat_sector_count = host2uint32_t_le(cfg->fat_sector_count);
+        vbr->version.major = 1;
+        vbr->version.minor = 0;
+        vbr->volume_flags = host2uint16_t_le(0);
+        vbr->bytes_per_sector = cfg->bytes_per_sectors;
+        vbr->sec_per_cluster = cfg->sec_per_cluster;
+        vbr->fat_count = 1;
+        vbr->drive_no = 0x80;
+        vbr->allocated_percent = 0;
+        vbr->signature = host2uint16_t_le(0xAA55);
+}
+
 int main (int argc, char **argv)
 {
+        exfat_cfg_t cfg;
         aoff64_t dev_nblocks;
         char *dev_path;
@@ -60 +121 @@
                 return 1;
         }
+
+        /* The fist sector of the partition is zero */
+        cfg.volume_start = 0;
 
         /* TODO: Add parameters */
@@ -86 +150 @@
         }
 
+        rc = block_get_nblocks(service_id, &dev_nblocks);
+        if (rc != EOK) {
+                printf(NAME ": Warning, failed to obtain device block size.\n");
+                /* FIXME: the user should specify the filesystem size */
+                return 1;
+        } else {
+                printf(NAME ": Block device has %" PRIuOFF64 " blocks.\n",
+                    dev_nblocks);
+
+                cfg.volume_count = dev_nblocks;
+        }
+
+        cfg_params_initialize(&cfg);
+
 
         return 0;
 }
+