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Add support for synthesizing an APM partition map to map Mac PowerPC

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bootstrap partitions from the ISO9660 boot catalog. This preserves OS X's
ability to mount the CD, while allowing us a way to provide HFS-ified
bootstrap code for Open Firmware.
This commit is contained in:
Nathan Whitehorn 2011-05-03 15:12:01 +00:00
parent 20ff6c114f
commit b3fa6d2cf1
1 changed files with 79 additions and 0 deletions
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79
usr.sbin/makefs/cd9660/cd9660_eltorito.c
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@ -31,6 +31,9 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include <netinet/in.h>
#include "cd9660.h"
#include "cd9660_eltorito.h"
@ -497,11 +500,43 @@ cd9660_setup_boot_volume_descriptor(volume_descriptor *bvd)
return 1;
}
static int
cd9660_write_apm_partition_entry(FILE *fd, int index, int total_partitions,
off_t sector_start, off_t nsectors, off_t sector_size,
const char *part_name, const char *part_type) {
uint32_t apm32;
uint16_t apm16;
fseeko(fd, (off_t)(index + 1) * sector_size, SEEK_SET);
/* Signature */
apm16 = htons(0x504d);
fwrite(&apm16, sizeof(apm16), 1, fd);
apm16 = 0;
fwrite(&apm16, sizeof(apm16), 1, fd);
/* Total number of partitions */
apm32 = htonl(total_partitions);
fwrite(&apm32, sizeof(apm32), 1, fd);
/* Bounds */
apm32 = htonl(sector_start);
fwrite(&apm32, sizeof(apm32), 1, fd);
apm32 = htonl(nsectors);
fwrite(&apm32, sizeof(apm32), 1, fd);
fwrite(part_name, strlen(part_name) + 1, 1, fd);
fseek(fd, 32 - strlen(part_name) - 1, SEEK_CUR);
fwrite(part_type, strlen(part_type) + 1, 1, fd);
return 0;
}
int
cd9660_write_boot(FILE *fd)
{
struct boot_catalog_entry *e;
struct cd9660_boot_image *t;
int apm_partitions = 0;
/* write boot catalog */
if (fseeko(fd, (off_t)diskStructure.boot_catalog_sector *
@ -533,7 +568,51 @@ cd9660_write_boot(FILE *fd)
t->filename, t->sector);
}
cd9660_copy_file(fd, t->sector, t->filename);
if (t->system == ET_SYS_MAC)
apm_partitions++;
}
if (apm_partitions > 0) {
/* Write DDR and global APM info */
uint32_t apm32;
uint16_t apm16;
int total_parts;
fseek(fd, 0, SEEK_SET);
apm16 = htons(0x4552);
fwrite(&apm16, sizeof(apm16), 1, fd);
apm16 = htons(diskStructure.sectorSize);
fwrite(&apm16, sizeof(apm16), 1, fd);
apm32 = htonl(diskStructure.totalSectors);
fwrite(&apm32, sizeof(apm32), 1, fd);
/* Count total needed entries */
total_parts = 2 + apm_partitions; /* Self + ISO9660 */
/* Write self-descriptor */
cd9660_write_apm_partition_entry(fd, 0,
total_parts, 1, total_parts, diskStructure.sectorSize,
"Apple", "Apple_partition_map");
/* Write ISO9660 descriptor, enclosing the whole disk */
cd9660_write_apm_partition_entry(fd, 1,
total_parts, 0, diskStructure.totalSectors,
diskStructure.sectorSize, "", "CD_ROM_Mode_1");
/* Write all partition entries */
apm_partitions = 0;
TAILQ_FOREACH(t, &diskStructure.boot_images, image_list) {
if (t->system != ET_SYS_MAC)
continue;
cd9660_write_apm_partition_entry(fd,
2 + apm_partitions++, total_parts,
t->sector, t->num_sectors, diskStructure.sectorSize,
"CD Boot", "Apple_Bootstrap");
}
}
return 0;
}