pc-bios/s390-ccw: ISO-9660 El Torito boot implementation
This patch enables boot from media formatted according to ISO-9660 and El Torito bootable CD specification. We try to boot from device as ISO-9660 media when SCSI IPL failed. The first boot catalog entry with bootable flag is used. ISO-9660 media with default 2048-bytes sector size only is supported. Signed-off-by: Maxim Samoylov <max7255@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Maxim Samoylov
Cornelia Huck
parent
38150be860
commit
866cac91e0
@ -444,6 +444,107 @@ static void ipl_scsi(void)
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zipl_run(prog_table_entry); /* no return */
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}
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/***********************************************************************
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* IPL El Torito ISO9660 image or DVD
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*/
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static bool is_iso_bc_entry_compatible(IsoBcSection *s)
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{
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return true;
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}
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static void load_iso_bc_entry(IsoBcSection *load)
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{
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IsoBcSection s = *load;
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/*
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* According to spec, extent for each file
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* is padded and ISO_SECTOR_SIZE bytes aligned
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*/
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uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT;
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read_iso_boot_image(bswap32(s.load_rba),
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(void *)((uint64_t)bswap16(s.load_segment)),
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blks_to_load);
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/* Trying to get PSW at zero address */
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if (*((uint64_t *)0) & IPL_PSW_MASK) {
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jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff);
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}
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/* Try default linux start address */
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jump_to_IPL_code(KERN_IMAGE_START);
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}
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static uint32_t find_iso_bc(void)
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{
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IsoVolDesc *vd = (IsoVolDesc *)sec;
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uint32_t block_num = ISO_PRIMARY_VD_SECTOR;
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if (virtio_read_many(block_num++, sec, 1)) {
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/* If primary vd cannot be read, there is no boot catalog */
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return 0;
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}
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while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) {
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if (vd->type == VOL_DESC_TYPE_BOOT) {
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IsoVdElTorito *et = &vd->vd.boot;
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if (!_memcmp(&et->el_torito[0], el_torito_magic, 32)) {
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return bswap32(et->bc_offset);
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}
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}
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read_iso_sector(block_num++, sec,
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"Failed to read ISO volume descriptor");
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}
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return 0;
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}
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static IsoBcSection *find_iso_bc_entry(void)
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{
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IsoBcEntry *e = (IsoBcEntry *)sec;
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uint32_t offset = find_iso_bc();
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int i;
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if (!offset) {
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return NULL;
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}
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read_iso_sector(offset, sec, "Failed to read El Torito boot catalog");
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if (!is_iso_bc_valid(e)) {
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/* The validation entry is mandatory */
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virtio_panic("No valid boot catalog found!\n");
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return NULL;
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}
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/*
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* Each entry has 32 bytes size, so one sector cannot contain > 64 entries.
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* We consider only boot catalogs with no more than 64 entries.
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*/
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for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) {
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if (e[i].id == ISO_BC_BOOTABLE_SECTION) {
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if (is_iso_bc_entry_compatible(&e[i].body.sect)) {
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return &e[i].body.sect;
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}
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}
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}
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virtio_panic("No suitable boot entry found on ISO-9660 media!\n");
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return NULL;
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}
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static void ipl_iso_el_torito(void)
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{
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IsoBcSection *s = find_iso_bc_entry();
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if (s) {
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load_iso_bc_entry(s);
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/* no return */
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}
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}
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/***********************************************************************
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* IPL starts here
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*/
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@ -463,6 +564,12 @@ void zipl_load(void)
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ipl_scsi(); /* no return */
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}
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/* Check if we can boot as ISO media */
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if (virtio_guessed_disk_nature()) {
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virtio_assume_iso9660();
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}
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ipl_iso_el_torito();
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/* We have failed to follow the SCSI scheme, so */
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if (virtio_guessed_disk_nature()) {
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sclp_print("Using guessed DASD geometry.\n");
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@ -341,4 +341,195 @@ static inline bool magic_match(const void *data, const void *magic)
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return *((uint32_t *)data) == *((uint32_t *)magic);
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}
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static inline int _memcmp(const void *s1, const void *s2, size_t n)
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{
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int i;
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const uint8_t *p1 = s1, *p2 = s2;
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for (i = 0; i < n; i++) {
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if (p1[i] != p2[i]) {
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return p1[i] > p2[i] ? 1 : -1;
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}
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}
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return 0;
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}
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/* from include/qemu/bswap.h */
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/* El Torito is always little-endian */
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static inline uint16_t bswap16(uint16_t x)
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{
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return ((x & 0x00ff) << 8) | ((x & 0xff00) >> 8);
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}
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static inline uint32_t bswap32(uint32_t x)
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{
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return ((x & 0x000000ffU) << 24) | ((x & 0x0000ff00U) << 8) |
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((x & 0x00ff0000U) >> 8) | ((x & 0xff000000U) >> 24);
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}
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static inline uint64_t bswap64(uint64_t x)
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{
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return ((x & 0x00000000000000ffULL) << 56) |
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((x & 0x000000000000ff00ULL) << 40) |
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((x & 0x0000000000ff0000ULL) << 24) |
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((x & 0x00000000ff000000ULL) << 8) |
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((x & 0x000000ff00000000ULL) >> 8) |
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((x & 0x0000ff0000000000ULL) >> 24) |
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((x & 0x00ff000000000000ULL) >> 40) |
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((x & 0xff00000000000000ULL) >> 56);
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}
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#define ISO_SECTOR_SIZE 2048
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/* El Torito specifies boot image size in 512 byte blocks */
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#define ET_SECTOR_SHIFT 2
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#define KERN_IMAGE_START 0x010000UL
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#define PSW_MASK_64 0x0000000100000000ULL
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#define PSW_MASK_32 0x0000000080000000ULL
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#define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64)
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#define ISO_PRIMARY_VD_SECTOR 16
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static inline void read_iso_sector(uint32_t block_offset, void *buf,
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const char *errmsg)
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{
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IPL_assert(virtio_read_many(block_offset, buf, 1) == 0, errmsg);
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}
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static inline void read_iso_boot_image(uint32_t block_offset, void *load_addr,
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uint32_t blks_to_load)
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{
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IPL_assert(virtio_read_many(block_offset, load_addr, blks_to_load) == 0,
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"Failed to read boot image!");
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}
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const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION"
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"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
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typedef struct IsoDirHdr {
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uint8_t dr_len;
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uint8_t ear_len;
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uint64_t ext_loc;
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uint64_t data_len;
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uint8_t recording_datetime[7];
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uint8_t file_flags;
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uint8_t file_unit_size;
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uint8_t gap_size;
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uint32_t vol_seqnum;
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uint8_t fileid_len;
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} __attribute__((packed)) IsoDirHdr;
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typedef struct IsoVdElTorito {
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uint8_t el_torito[32]; /* must contain el_torito_magic value */
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uint8_t unused0[32];
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uint32_t bc_offset;
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uint8_t unused1[1974];
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} __attribute__((packed)) IsoVdElTorito;
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typedef struct IsoVdPrimary {
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uint8_t unused1;
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uint8_t sys_id[32];
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uint8_t vol_id[32];
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uint8_t unused2[8];
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uint64_t vol_space_size;
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uint8_t unused3[32];
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uint32_t vol_set_size;
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uint32_t vol_seqnum;
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uint32_t log_block_size;
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uint64_t path_table_size;
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uint32_t l_path_table;
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uint32_t opt_l_path_table;
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uint32_t m_path_table;
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uint32_t opt_m_path_table;
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IsoDirHdr rootdir;
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uint8_t root_null;
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uint8_t reserved2[1858];
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} __attribute__((packed)) IsoVdPrimary;
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typedef struct IsoVolDesc {
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uint8_t type;
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uint8_t ident[5];
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uint8_t version;
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union {
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IsoVdElTorito boot;
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IsoVdPrimary primary;
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} vd;
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} __attribute__((packed)) IsoVolDesc;
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const uint8_t vol_desc_magic[] = "CD001";
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#define VOL_DESC_TYPE_BOOT 0
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#define VOL_DESC_TYPE_PRIMARY 1
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#define VOL_DESC_TYPE_SUPPLEMENT 2
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#define VOL_DESC_TYPE_PARTITION 3
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#define VOL_DESC_TERMINATOR 255
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static inline bool is_iso_vd_valid(IsoVolDesc *vd)
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{
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return !_memcmp(&vd->ident[0], vol_desc_magic, 5) &&
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vd->version == 0x1 &&
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vd->type <= VOL_DESC_TYPE_PARTITION;
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}
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typedef struct IsoBcValid {
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uint8_t platform_id;
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uint16_t reserved;
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uint8_t id[24];
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uint16_t checksum;
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uint8_t key[2];
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} __attribute__((packed)) IsoBcValid;
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typedef struct IsoBcSection {
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uint8_t boot_type;
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uint16_t load_segment;
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uint8_t sys_type;
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uint8_t unused;
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uint16_t sector_count;
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uint32_t load_rba;
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uint8_t selection[20];
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} __attribute__((packed)) IsoBcSection;
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typedef struct IsoBcHdr {
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uint8_t platform_id;
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uint16_t sect_num;
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uint8_t id[28];
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} __attribute__((packed)) IsoBcHdr;
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typedef struct IsoBcEntry {
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uint8_t id;
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union {
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IsoBcValid valid; /* id == 0x01 */
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IsoBcSection sect; /* id == 0x88 || id == 0x0 */
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IsoBcHdr hdr; /* id == 0x90 || id == 0x91 */
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} body;
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} __attribute__((packed)) IsoBcEntry;
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#define ISO_BC_ENTRY_PER_SECTOR (ISO_SECTOR_SIZE / sizeof(IsoBcEntry))
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#define ISO_BC_HDR_VALIDATION 0x01
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#define ISO_BC_BOOTABLE_SECTION 0x88
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#define ISO_BC_MAGIC_55 0x55
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#define ISO_BC_MAGIC_AA 0xaa
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#define ISO_BC_PLATFORM_X86 0x0
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#define ISO_BC_PLATFORM_PPC 0x1
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#define ISO_BC_PLATFORM_MAC 0x2
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static inline bool is_iso_bc_valid(IsoBcEntry *e)
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{
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IsoBcValid *v = &e->body.valid;
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if (e->id != ISO_BC_HDR_VALIDATION) {
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return false;
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}
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if (v->platform_id != ISO_BC_PLATFORM_X86 &&
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v->platform_id != ISO_BC_PLATFORM_PPC &&
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v->platform_id != ISO_BC_PLATFORM_MAC) {
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return false;
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}
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return v->key[0] == ISO_BC_MAGIC_55 &&
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v->key[1] == ISO_BC_MAGIC_AA &&
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v->reserved == 0x0;
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}
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#endif /* _PC_BIOS_S390_CCW_BOOTMAP_H */
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@ -278,6 +278,13 @@ void virtio_assume_scsi(void)
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blk_cfg.physical_block_exp = 0;
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}
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void virtio_assume_iso9660(void)
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{
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guessed_disk_nature = true;
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blk_cfg.blk_size = 2048;
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blk_cfg.physical_block_exp = 0;
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}
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void virtio_assume_eckd(void)
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{
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guessed_disk_nature = true;
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@ -187,6 +187,7 @@ typedef struct VirtioBlkConfig {
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bool virtio_guessed_disk_nature(void);
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void virtio_assume_scsi(void);
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void virtio_assume_eckd(void);
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void virtio_assume_iso9660(void);
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extern bool virtio_disk_is_scsi(void);
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extern bool virtio_disk_is_eckd(void);
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