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

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.

1 files changed, 79 insertions, 0 deletions

diff --git a/usr.sbin/makefs/cd9660/cd9660_eltorito.c b/usr.sbin/makefs/cd9660/cd9660_eltorito.c
index 055451d..f0c8b2d 100644
--- a/usr.sbin/makefs/cd9660/cd9660_eltorito.c
+++ b/usr.sbin/makefs/cd9660/cd9660_eltorito.c
@@ -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;
 }
+