diff options
Diffstat (limited to 'pc-bios/s390-ccw/bootmap.c')
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.c | 844 |
1 files changed, 844 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c new file mode 100644 index 000000000..56411ab3b --- /dev/null +++ b/pc-bios/s390-ccw/bootmap.c @@ -0,0 +1,844 @@ +/* + * QEMU S390 bootmap interpreter + * + * Copyright (c) 2009 Alexander Graf <agraf@suse.de> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include "libc.h" +#include "s390-ccw.h" +#include "s390-arch.h" +#include "bootmap.h" +#include "virtio.h" +#include "bswap.h" + +#ifdef DEBUG +/* #define DEBUG_FALLBACK */ +#endif + +#ifdef DEBUG_FALLBACK +#define dputs(txt) \ + do { sclp_print("zipl: " txt); } while (0) +#else +#define dputs(fmt, ...) \ + do { } while (0) +#endif + +/* Scratch space */ +static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE))); + +const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION" + "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; + +/* + * Match two CCWs located after PSW and eight filler bytes. + * From libmagic and arch/s390/kernel/head.S. + */ +const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00" + "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40" + "\x40\x40\x40\x40"; + +static inline bool is_iso_vd_valid(IsoVolDesc *vd) +{ + const uint8_t vol_desc_magic[] = "CD001"; + + return !memcmp(&vd->ident[0], vol_desc_magic, 5) && + vd->version == 0x1 && + vd->type <= VOL_DESC_TYPE_PARTITION; +} + +/*********************************************************************** + * IPL an ECKD DASD (CDL or LDL/CMS format) + */ + +static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */ +static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); +static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE))); +static void *s2_prev_blk = _s2; +static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; +static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; + +static inline void verify_boot_info(BootInfo *bip) +{ + IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); + IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); + IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); + IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); + IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); + IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), + "Bad block size in zIPL section of the 1st record."); +} + +static block_number_t eckd_block_num(EckdCHS *chs) +{ + const uint64_t sectors = virtio_get_sectors(); + const uint64_t heads = virtio_get_heads(); + const uint64_t cylinder = chs->cylinder + + ((chs->head & 0xfff0) << 12); + const uint64_t head = chs->head & 0x000f; + const block_number_t block = sectors * heads * cylinder + + sectors * head + + chs->sector + - 1; /* block nr starts with zero */ + return block; +} + +static bool eckd_valid_address(BootMapPointer *p) +{ + const uint64_t head = p->eckd.chs.head & 0x000f; + + if (head >= virtio_get_heads() + || p->eckd.chs.sector > virtio_get_sectors() + || p->eckd.chs.sector <= 0) { + return false; + } + + if (!virtio_guessed_disk_nature() && + eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) { + return false; + } + + return true; +} + +static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address) +{ + block_number_t block_nr; + int j, rc; + BootMapPointer *bprs = (void *)_bprs; + bool more_data; + + memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); + read_block(blk, bprs, "BPRS read failed"); + + do { + more_data = false; + for (j = 0;; j++) { + block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs); + if (is_null_block_number(block_nr)) { /* end of chunk */ + break; + } + + /* we need the updated blockno for the next indirect entry + * in the chain, but don't want to advance address + */ + if (j == (max_bprs_entries - 1)) { + break; + } + + IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size), + "bad chunk block size"); + IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr"); + + if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]), + sizeof(EckdBlockPtr))) { + /* This is a "continue" pointer. + * This ptr should be the last one in the current + * script section. + * I.e. the next ptr must point to the unused memory area + */ + memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); + read_block(block_nr, bprs, "BPRS continuation read failed"); + more_data = true; + break; + } + + /* Load (count+1) blocks of code at (block_nr) + * to memory (address). + */ + rc = virtio_read_many(block_nr, (void *)(*address), + bprs[j].xeckd.bptr.count+1); + IPL_assert(rc == 0, "code chunk read failed"); + + *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size(); + } + } while (more_data); + return block_nr; +} + +static bool find_zipl_boot_menu_banner(int *offset) +{ + int i; + + /* Menu banner starts with "zIPL" */ + for (i = 0; i <= virtio_get_block_size() - 4; i++) { + if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { + *offset = i; + return true; + } + } + + return false; +} + +static int eckd_get_boot_menu_index(block_number_t s1b_block_nr) +{ + block_number_t cur_block_nr; + block_number_t prev_block_nr = 0; + block_number_t next_block_nr = 0; + EckdStage1b *s1b = (void *)sec; + int banner_offset; + int i; + + /* Get Stage1b data */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader"); + + memset(_s2, FREE_SPACE_FILLER, sizeof(_s2)); + + /* Get Stage2 data */ + for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) { + cur_block_nr = eckd_block_num(&s1b->seek[i].chs); + + if (!cur_block_nr || is_null_block_number(cur_block_nr)) { + break; + } + + read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader"); + + if (find_zipl_boot_menu_banner(&banner_offset)) { + /* + * Load the adjacent blocks to account for the + * possibility of menu data spanning multiple blocks. + */ + if (prev_block_nr) { + read_block(prev_block_nr, s2_prev_blk, + "Cannot read stage2 boot loader"); + } + + if (i + 1 < STAGE2_BLK_CNT_MAX) { + next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs); + } + + if (next_block_nr && !is_null_block_number(next_block_nr)) { + read_block(next_block_nr, s2_next_blk, + "Cannot read stage2 boot loader"); + } + + return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); + } + + prev_block_nr = cur_block_nr; + } + + sclp_print("No zipl boot menu data found. Booting default entry."); + return 0; +} + +static void run_eckd_boot_script(block_number_t bmt_block_nr, + block_number_t s1b_block_nr) +{ + int i; + unsigned int loadparm = get_loadparm_index(); + block_number_t block_nr; + uint64_t address; + BootMapTable *bmt = (void *)sec; + BootMapScript *bms = (void *)sec; + + if (menu_is_enabled_zipl()) { + loadparm = eckd_get_boot_menu_index(s1b_block_nr); + } + + debug_print_int("loadparm", loadparm); + IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" + " maximum number of boot entries allowed"); + + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(bmt_block_nr, sec, "Cannot read Boot Map Table"); + + block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs); + IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry"); + + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(block_nr, sec, "Cannot read Boot Map Script"); + + for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD || + bms->entry[i].type == BOOT_SCRIPT_SIGNATURE; i++) { + + /* We don't support secure boot yet, so we skip signature entries */ + if (bms->entry[i].type == BOOT_SCRIPT_SIGNATURE) { + continue; + } + + address = bms->entry[i].address.load_address; + block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs); + + do { + block_nr = load_eckd_segments(block_nr, &address); + } while (block_nr != -1); + } + + IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC, + "Unknown script entry type"); + write_reset_psw(bms->entry[i].address.load_address); /* no return */ + jump_to_IPL_code(0); /* no return */ +} + +static void ipl_eckd_cdl(void) +{ + XEckdMbr *mbr; + EckdCdlIpl2 *ipl2 = (void *)sec; + IplVolumeLabel *vlbl = (void *)sec; + block_number_t bmt_block_nr, s1b_block_nr; + + /* we have just read the block #0 and recognized it as "IPL1" */ + sclp_print("CDL\n"); + + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(1, ipl2, "Cannot read IPL2 record at block 1"); + + mbr = &ipl2->mbr; + if (!magic_match(mbr, ZIPL_MAGIC)) { + sclp_print("No zIPL section in IPL2 record.\n"); + return; + } + if (!block_size_ok(mbr->blockptr.xeckd.bptr.size)) { + sclp_print("Bad block size in zIPL section of IPL2 record.\n"); + return; + } + if (mbr->dev_type != DEV_TYPE_ECKD) { + sclp_print("Non-ECKD device type in zIPL section of IPL2 record.\n"); + return; + } + + /* save pointer to Boot Map Table */ + bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs); + + /* save pointer to Stage1b Data */ + s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs); + + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(2, vlbl, "Cannot read Volume Label at block 2"); + if (!magic_match(vlbl->key, VOL1_MAGIC)) { + sclp_print("Invalid magic of volume label block.\n"); + return; + } + if (!magic_match(vlbl->f.key, VOL1_MAGIC)) { + sclp_print("Invalid magic of volser block.\n"); + return; + } + print_volser(vlbl->f.volser); + + run_eckd_boot_script(bmt_block_nr, s1b_block_nr); + /* no return */ +} + +static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode) +{ + LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */ + char msg[4] = { '?', '.', '\n', '\0' }; + + sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL"); + sclp_print(" version "); + switch (vlbl->LDL_version) { + case LDL1_VERSION: + msg[0] = '1'; + break; + case LDL2_VERSION: + msg[0] = '2'; + break; + default: + msg[0] = ebc2asc[vlbl->LDL_version]; + msg[1] = '?'; + break; + } + sclp_print(msg); + print_volser(vlbl->volser); +} + +static void ipl_eckd_ldl(ECKD_IPL_mode_t mode) +{ + block_number_t bmt_block_nr, s1b_block_nr; + EckdLdlIpl1 *ipl1 = (void *)sec; + + if (mode != ECKD_LDL_UNLABELED) { + print_eckd_ldl_msg(mode); + } + + /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */ + + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(0, sec, "Cannot read block 0 to grab boot info."); + if (mode == ECKD_LDL_UNLABELED) { + if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { + return; /* not applicable layout */ + } + sclp_print("unlabeled LDL.\n"); + } + verify_boot_info(&ipl1->bip); + + /* save pointer to Boot Map Table */ + bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs); + + /* save pointer to Stage1b Data */ + s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs); + + run_eckd_boot_script(bmt_block_nr, s1b_block_nr); + /* no return */ +} + +static void print_eckd_msg(void) +{ + char msg[] = "Using ECKD scheme (block size *****), "; + char *p = &msg[34], *q = &msg[30]; + int n = virtio_get_block_size(); + + /* Fill in the block size and show up the message */ + if (n > 0 && n <= 99999) { + while (n) { + *p-- = '0' + (n % 10); + n /= 10; + } + while (p >= q) { + *p-- = ' '; + } + } + sclp_print(msg); +} + +static void ipl_eckd(void) +{ + XEckdMbr *mbr = (void *)sec; + LDL_VTOC *vlbl = (void *)sec; + + print_eckd_msg(); + + /* Grab the MBR again */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(0, mbr, "Cannot read block 0 on DASD"); + + if (magic_match(mbr->magic, IPL1_MAGIC)) { + ipl_eckd_cdl(); /* only returns in case of error */ + return; + } + + /* LDL/CMS? */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(2, vlbl, "Cannot read block 2"); + + if (magic_match(vlbl->magic, CMS1_MAGIC)) { + ipl_eckd_ldl(ECKD_CMS); /* no return */ + } + if (magic_match(vlbl->magic, LNX1_MAGIC)) { + ipl_eckd_ldl(ECKD_LDL); /* no return */ + } + + ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ + /* + * Ok, it is not a LDL by any means. + * It still might be a CDL with zero record keys for IPL1 and IPL2 + */ + ipl_eckd_cdl(); +} + +/*********************************************************************** + * IPL a SCSI disk + */ + +static void zipl_load_segment(ComponentEntry *entry) +{ + const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); + ScsiBlockPtr *bprs = (void *)sec; + const int bprs_size = sizeof(sec); + block_number_t blockno; + uint64_t address; + int i; + char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ"; + char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */ + + blockno = entry->data.blockno; + address = entry->compdat.load_addr; + + debug_print_int("loading segment at block", blockno); + debug_print_int("addr", address); + + do { + memset(bprs, FREE_SPACE_FILLER, bprs_size); + fill_hex_val(blk_no, &blockno, sizeof(blockno)); + read_block(blockno, bprs, err_msg); + + for (i = 0;; i++) { + uint64_t *cur_desc = (void *)&bprs[i]; + + blockno = bprs[i].blockno; + if (!blockno) { + break; + } + + /* we need the updated blockno for the next indirect entry in the + chain, but don't want to advance address */ + if (i == (max_entries - 1)) { + break; + } + + if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1], + sizeof(ScsiBlockPtr))) { + /* This is a "continue" pointer. + * This ptr is the last one in the current script section. + * I.e. the next ptr must point to the unused memory area. + * The blockno is not zero, so the upper loop must continue + * reading next section of BPRS. + */ + break; + } + address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, + (void *)address); + IPL_assert(address != -1, "zIPL load segment failed"); + } + } while (blockno); +} + +/* Run a zipl program */ +static void zipl_run(ScsiBlockPtr *pte) +{ + ComponentHeader *header; + ComponentEntry *entry; + uint8_t tmp_sec[MAX_SECTOR_SIZE]; + + read_block(pte->blockno, tmp_sec, "Cannot read header"); + header = (ComponentHeader *)tmp_sec; + + IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); + IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); + + dputs("start loading images\n"); + + /* Load image(s) into RAM */ + entry = (ComponentEntry *)(&header[1]); + while (entry->component_type == ZIPL_COMP_ENTRY_LOAD || + entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { + + /* We don't support secure boot yet, so we skip signature entries */ + if (entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) { + entry++; + continue; + } + + zipl_load_segment(entry); + + entry++; + + IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), + "Wrong entry value"); + } + + IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); + + /* should not return */ + write_reset_psw(entry->compdat.load_psw); + jump_to_IPL_code(0); +} + +static void ipl_scsi(void) +{ + ScsiMbr *mbr = (void *)sec; + int program_table_entries = 0; + BootMapTable *prog_table = (void *)sec; + unsigned int loadparm = get_loadparm_index(); + bool valid_entries[MAX_BOOT_ENTRIES] = {false}; + size_t i; + + /* Grab the MBR */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(0, mbr, "Cannot read block 0"); + + if (!magic_match(mbr->magic, ZIPL_MAGIC)) { + return; + } + + sclp_print("Using SCSI scheme.\n"); + debug_print_int("MBR Version", mbr->version_id); + IPL_check(mbr->version_id == 1, + "Unknown MBR layout version, assuming version 1"); + debug_print_int("program table", mbr->pt.blockno); + IPL_assert(mbr->pt.blockno, "No Program Table"); + + /* Parse the program table */ + read_block(mbr->pt.blockno, sec, "Error reading Program Table"); + IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); + + for (i = 0; i < MAX_BOOT_ENTRIES; i++) { + if (prog_table->entry[i].scsi.blockno) { + valid_entries[i] = true; + program_table_entries++; + } + } + + debug_print_int("program table entries", program_table_entries); + IPL_assert(program_table_entries != 0, "Empty Program Table"); + + if (menu_is_enabled_enum()) { + loadparm = menu_get_enum_boot_index(valid_entries); + } + + debug_print_int("loadparm", loadparm); + IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" + " maximum number of boot entries allowed"); + + zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ +} + +/*********************************************************************** + * IPL El Torito ISO9660 image or DVD + */ + +static bool is_iso_bc_entry_compatible(IsoBcSection *s) +{ + uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE); + + if (s->unused || !s->sector_count) { + return false; + } + read_iso_sector(bswap32(s->load_rba), magic_sec, + "Failed to read image sector 0"); + + /* Checking bytes 8 - 32 for S390 Linux magic */ + return !memcmp(magic_sec + 8, linux_s390_magic, 24); +} + +/* Location of the current sector of the directory */ +static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; +/* Offset in the current sector of the directory */ +static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; +/* Remained directory space in bytes */ +static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; + +static inline uint32_t iso_get_file_size(uint32_t load_rba) +{ + IsoVolDesc *vd = (IsoVolDesc *)sec; + IsoDirHdr *cur_record = &vd->vd.primary.rootdir; + uint8_t *temp = sec + ISO_SECTOR_SIZE; + int level = 0; + + read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, + "Failed to read ISO primary descriptor"); + sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); + dir_rem[0] = 0; + sec_offset[0] = 0; + + while (level >= 0) { + IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, + "Directory tree structure violation"); + + cur_record = (IsoDirHdr *)(temp + sec_offset[level]); + + if (sec_offset[level] == 0) { + read_iso_sector(sec_loc[level], temp, + "Failed to read ISO directory"); + if (dir_rem[level] == 0) { + /* Skip self and parent records */ + dir_rem[level] = iso_733_to_u32(cur_record->data_len) - + cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + + cur_record = (IsoDirHdr *)(temp + sec_offset[level]); + dir_rem[level] -= cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + continue; + } + } + + if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { + /* Zero-padding and/or the end of current sector */ + dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; + sec_offset[level] = 0; + sec_loc[level]++; + } else { + /* The directory record is valid */ + if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { + return iso_733_to_u32(cur_record->data_len); + } + + dir_rem[level] -= cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + + if (cur_record->file_flags & 0x2) { + /* Subdirectory */ + if (level == ISO9660_MAX_DIR_DEPTH - 1) { + sclp_print("ISO-9660 directory depth limit exceeded\n"); + } else { + level++; + sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); + sec_offset[level] = 0; + dir_rem[level] = 0; + continue; + } + } + } + + if (dir_rem[level] == 0) { + /* Nothing remaining */ + level--; + read_iso_sector(sec_loc[level], temp, + "Failed to read ISO directory"); + } + } + + return 0; +} + +static void load_iso_bc_entry(IsoBcSection *load) +{ + IsoBcSection s = *load; + /* + * According to spec, extent for each file + * is padded and ISO_SECTOR_SIZE bytes aligned + */ + uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; + uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); + + if (real_size) { + /* Round up blocks to load */ + blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; + sclp_print("ISO boot image size verified\n"); + } else { + sclp_print("ISO boot image size could not be verified\n"); + } + + read_iso_boot_image(bswap32(s.load_rba), + (void *)((uint64_t)bswap16(s.load_segment)), + blks_to_load); + + jump_to_low_kernel(); +} + +static uint32_t find_iso_bc(void) +{ + IsoVolDesc *vd = (IsoVolDesc *)sec; + uint32_t block_num = ISO_PRIMARY_VD_SECTOR; + + if (virtio_read_many(block_num++, sec, 1)) { + /* If primary vd cannot be read, there is no boot catalog */ + return 0; + } + + while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) { + if (vd->type == VOL_DESC_TYPE_BOOT) { + IsoVdElTorito *et = &vd->vd.boot; + + if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) { + return bswap32(et->bc_offset); + } + } + read_iso_sector(block_num++, sec, + "Failed to read ISO volume descriptor"); + } + + return 0; +} + +static IsoBcSection *find_iso_bc_entry(void) +{ + IsoBcEntry *e = (IsoBcEntry *)sec; + uint32_t offset = find_iso_bc(); + int i; + unsigned int loadparm = get_loadparm_index(); + + if (!offset) { + return NULL; + } + + read_iso_sector(offset, sec, "Failed to read El Torito boot catalog"); + + if (!is_iso_bc_valid(e)) { + /* The validation entry is mandatory */ + panic("No valid boot catalog found!\n"); + return NULL; + } + + /* + * Each entry has 32 bytes size, so one sector cannot contain > 64 entries. + * We consider only boot catalogs with no more than 64 entries. + */ + for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) { + if (e[i].id == ISO_BC_BOOTABLE_SECTION) { + if (is_iso_bc_entry_compatible(&e[i].body.sect)) { + if (loadparm <= 1) { + /* found, default, or unspecified */ + return &e[i].body.sect; + } + loadparm--; + } + } + } + + panic("No suitable boot entry found on ISO-9660 media!\n"); + + return NULL; +} + +static void ipl_iso_el_torito(void) +{ + IsoBcSection *s = find_iso_bc_entry(); + + if (s) { + load_iso_bc_entry(s); + /* no return */ + } +} + +/*********************************************************************** + * Bus specific IPL sequences + */ + +static void zipl_load_vblk(void) +{ + if (virtio_guessed_disk_nature()) { + virtio_assume_iso9660(); + } + ipl_iso_el_torito(); + + if (virtio_guessed_disk_nature()) { + sclp_print("Using guessed DASD geometry.\n"); + virtio_assume_eckd(); + } + ipl_eckd(); +} + +static void zipl_load_vscsi(void) +{ + if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { + /* Is it an ISO image in non-CD drive? */ + ipl_iso_el_torito(); + } + + sclp_print("Using guessed DASD geometry.\n"); + virtio_assume_eckd(); + ipl_eckd(); +} + +/*********************************************************************** + * IPL starts here + */ + +void zipl_load(void) +{ + VDev *vdev = virtio_get_device(); + + if (vdev->is_cdrom) { + ipl_iso_el_torito(); + panic("\n! Cannot IPL this ISO image !\n"); + } + + if (virtio_get_device_type() == VIRTIO_ID_NET) { + jump_to_IPL_code(vdev->netboot_start_addr); + } + + ipl_scsi(); + + switch (virtio_get_device_type()) { + case VIRTIO_ID_BLOCK: + zipl_load_vblk(); + break; + case VIRTIO_ID_SCSI: + zipl_load_vscsi(); + break; + default: + panic("\n! Unknown IPL device type !\n"); + } + + sclp_print("zIPL load failed.\n"); +} |