| /* |
| * 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 <string.h> |
| #include <stdio.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 { printf("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 void eckd_format_chs(ExtEckdBlockPtr *ptr, bool ldipl, |
| uint64_t *c, |
| uint64_t *h, |
| uint64_t *s) |
| { |
| if (ldipl) { |
| *c = ptr->ldptr.chs.cylinder; |
| *h = ptr->ldptr.chs.head; |
| *s = ptr->ldptr.chs.sector; |
| } else { |
| *c = ptr->bptr.chs.cylinder; |
| *h = ptr->bptr.chs.head; |
| *s = ptr->bptr.chs.sector; |
| } |
| } |
| |
| static block_number_t eckd_chs_to_block(uint64_t c, uint64_t h, uint64_t s) |
| { |
| const uint64_t sectors = virtio_get_sectors(); |
| const uint64_t heads = virtio_get_heads(); |
| const uint64_t cylinder = c + ((h & 0xfff0) << 12); |
| const uint64_t head = h & 0x000f; |
| const block_number_t block = sectors * heads * cylinder |
| + sectors * head |
| + s - 1; /* block nr starts with zero */ |
| return block; |
| } |
| |
| static block_number_t eckd_block_num(EckdCHS *chs) |
| { |
| return eckd_chs_to_block(chs->cylinder, chs->head, chs->sector); |
| } |
| |
| static block_number_t gen_eckd_block_num(ExtEckdBlockPtr *ptr, bool ldipl) |
| { |
| uint64_t cyl, head, sec; |
| eckd_format_chs(ptr, ldipl, &cyl, &head, &sec); |
| return eckd_chs_to_block(cyl, head, sec); |
| } |
| |
| static bool eckd_valid_chs(uint64_t cyl, uint64_t head, uint64_t sector) |
| { |
| if (head >= virtio_get_heads() |
| || sector > virtio_get_sectors() |
| || sector <= 0) { |
| return false; |
| } |
| |
| if (!virtio_guessed_disk_nature() && |
| eckd_chs_to_block(cyl, head, sector) >= virtio_get_blocks()) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool eckd_valid_address(ExtEckdBlockPtr *ptr, bool ldipl) |
| { |
| uint64_t cyl, head, sec; |
| eckd_format_chs(ptr, ldipl, &cyl, &head, &sec); |
| return eckd_valid_chs(cyl, head, sec); |
| } |
| |
| static block_number_t load_eckd_segments(block_number_t blk, bool ldipl, |
| uint64_t *address) |
| { |
| block_number_t block_nr; |
| int j, rc, count; |
| BootMapPointer *bprs = (void *)_bprs; |
| bool more_data; |
| |
| memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs)); |
| if (virtio_read(blk, bprs)) { |
| puts("BPRS read failed"); |
| return ERROR_BLOCK_NR; |
| } |
| |
| do { |
| more_data = false; |
| for (j = 0;; j++) { |
| block_nr = gen_eckd_block_num(&bprs[j].xeckd, ldipl); |
| if (is_null_block_number(block_nr)) { /* end of chunk */ |
| return NULL_BLOCK_NR; |
| } |
| |
| /* 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; |
| } |
| |
| /* List directed pointer does not store block size */ |
| if (!ldipl && !block_size_ok(bprs[j].xeckd.bptr.size)) { |
| puts("Bad chunk block size"); |
| return ERROR_BLOCK_NR; |
| } |
| |
| if (!eckd_valid_address(&bprs[j].xeckd, ldipl)) { |
| /* |
| * If an invalid address is found during LD-IPL then break and |
| * retry as CCW-IPL, otherwise abort on error |
| */ |
| if (!ldipl) { |
| puts("Bad chunk ECKD address"); |
| return ERROR_BLOCK_NR; |
| } |
| break; |
| } |
| |
| if (ldipl) { |
| count = bprs[j].xeckd.ldptr.count; |
| } else { |
| count = bprs[j].xeckd.bptr.count; |
| } |
| |
| if (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)); |
| if (virtio_read(block_nr, bprs)) { |
| puts("BPRS continuation read failed"); |
| return ERROR_BLOCK_NR; |
| } |
| more_data = true; |
| break; |
| } |
| |
| /* Load (count+1) blocks of code at (block_nr) |
| * to memory (address). |
| */ |
| rc = virtio_read_many(block_nr, (void *)(*address), count + 1); |
| if (rc != 0) { |
| puts("Code chunk read failed"); |
| return ERROR_BLOCK_NR; |
| } |
| |
| *address += (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)); |
| if (virtio_read(s1b_block_nr, s1b)) { |
| puts("Cannot read stage1b boot loader"); |
| return -EIO; |
| } |
| |
| 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; |
| } |
| |
| if (virtio_read(cur_block_nr, s2_cur_blk)) { |
| puts("Cannot read stage2 boot loader"); |
| return -EIO; |
| } |
| |
| 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) { |
| if (virtio_read(prev_block_nr, s2_prev_blk)) { |
| puts("Cannot read stage2 boot loader"); |
| return -EIO; |
| } |
| } |
| |
| 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)) { |
| if (virtio_read(next_block_nr, s2_next_blk)) { |
| puts("Cannot read stage2 boot loader"); |
| return -EIO; |
| } |
| } |
| |
| return menu_get_zipl_boot_index(s2_cur_blk + banner_offset); |
| } |
| |
| prev_block_nr = cur_block_nr; |
| } |
| |
| printf("No zipl boot menu data found. Booting default entry."); |
| return 0; |
| } |
| |
| static int 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; |
| /* The S1B block number is NULL_BLOCK_NR if and only if it's an LD-IPL */ |
| bool ldipl = (s1b_block_nr == NULL_BLOCK_NR); |
| |
| if (menu_is_enabled_zipl() && !ldipl) { |
| loadparm = eckd_get_boot_menu_index(s1b_block_nr); |
| } |
| |
| debug_print_int("loadparm", loadparm); |
| if (loadparm >= MAX_BOOT_ENTRIES) { |
| puts("loadparm value greater than max number of boot entries allowed"); |
| return -EINVAL; |
| } |
| |
| memset(sec, FREE_SPACE_FILLER, sizeof(sec)); |
| if (virtio_read(bmt_block_nr, sec)) { |
| puts("Cannot read Boot Map Table"); |
| return -EIO; |
| } |
| |
| block_nr = gen_eckd_block_num(&bmt->entry[loadparm].xeckd, ldipl); |
| if (block_nr == NULL_BLOCK_NR) { |
| puts("Cannot find Boot Map Table Entry"); |
| return -EIO; |
| } |
| |
| memset(sec, FREE_SPACE_FILLER, sizeof(sec)); |
| if (virtio_read(block_nr, sec)) { |
| puts("Cannot read Boot Map Script"); |
| return -EIO; |
| } |
| |
| 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 = gen_eckd_block_num(&bms->entry[i].blkptr.xeckd, ldipl); |
| |
| do { |
| block_nr = load_eckd_segments(block_nr, ldipl, &address); |
| if (block_nr == ERROR_BLOCK_NR) { |
| return ldipl ? 0 : -EIO; |
| } |
| } while (block_nr != NULL_BLOCK_NR); |
| } |
| |
| if (ldipl && bms->entry[i].type != BOOT_SCRIPT_EXEC) { |
| /* Abort LD-IPL and retry as CCW-IPL */ |
| return 0; |
| } |
| |
| if (bms->entry[i].type != BOOT_SCRIPT_EXEC) { |
| puts("Unknown script entry type"); |
| return -EINVAL; |
| } |
| write_reset_psw(bms->entry[i].address.load_address); /* no return */ |
| jump_to_IPL_code(0); /* no return */ |
| return -1; |
| } |
| |
| static int 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" */ |
| puts("CDL"); |
| |
| memset(sec, FREE_SPACE_FILLER, sizeof(sec)); |
| if (virtio_read(1, ipl2)) { |
| puts("Cannot read IPL2 record at block 1"); |
| return -EIO; |
| } |
| |
| mbr = &ipl2->mbr; |
| if (!magic_match(mbr, ZIPL_MAGIC)) { |
| puts("No zIPL section in IPL2 record."); |
| return 0; |
| } |
| if (!block_size_ok(mbr->blockptr.xeckd.bptr.size)) { |
| puts("Bad block size in zIPL section of IPL2 record."); |
| return 0; |
| } |
| if (mbr->dev_type != DEV_TYPE_ECKD) { |
| puts("Non-ECKD device type in zIPL section of IPL2 record."); |
| return 0; |
| } |
| |
| /* 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)); |
| if (virtio_read(2, vlbl)) { |
| puts("Cannot read Volume Label at block 2"); |
| return -EIO; |
| } |
| if (!magic_match(vlbl->key, VOL1_MAGIC)) { |
| puts("Invalid magic of volume label block."); |
| return 0; |
| } |
| if (!magic_match(vlbl->f.key, VOL1_MAGIC)) { |
| puts("Invalid magic of volser block."); |
| return 0; |
| } |
| print_volser(vlbl->f.volser); |
| |
| return run_eckd_boot_script(bmt_block_nr, s1b_block_nr); |
| } |
| |
| 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' }; |
| |
| printf((mode == ECKD_CMS) ? "CMS" : "LDL"); |
| printf(" 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; |
| } |
| printf("%s", msg); |
| print_volser(vlbl->volser); |
| } |
| |
| static int 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)); |
| if (virtio_read(0, sec)) { |
| puts("Cannot read block 0 to grab boot info."); |
| return -EIO; |
| } |
| if (mode == ECKD_LDL_UNLABELED) { |
| if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) { |
| return 0; /* not applicable layout */ |
| } |
| puts("unlabeled LDL."); |
| } |
| 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); |
| |
| return run_eckd_boot_script(bmt_block_nr, s1b_block_nr); |
| } |
| |
| static block_number_t eckd_find_bmt(ExtEckdBlockPtr *ptr) |
| { |
| block_number_t blockno; |
| uint8_t tmp_sec[MAX_SECTOR_SIZE]; |
| BootRecord *br; |
| |
| blockno = gen_eckd_block_num(ptr, 0); |
| if (virtio_read(blockno, tmp_sec)) { |
| puts("Cannot read boot record"); |
| return ERROR_BLOCK_NR; |
| } |
| br = (BootRecord *)tmp_sec; |
| if (!magic_match(br->magic, ZIPL_MAGIC)) { |
| /* If the boot record is invalid, return and try CCW-IPL instead */ |
| return NULL_BLOCK_NR; |
| } |
| |
| return gen_eckd_block_num(&br->pgt.xeckd, 1); |
| } |
| |
| 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-- = ' '; |
| } |
| } |
| printf("%s", msg); |
| } |
| |
| static int ipl_eckd(void) |
| { |
| IplVolumeLabel *vlbl = (void *)sec; |
| LDL_VTOC *vtoc = (void *)sec; |
| block_number_t ldipl_bmt; /* Boot Map Table for List-Directed IPL */ |
| |
| print_eckd_msg(); |
| |
| /* Block 2 can contain either the CDL VOL1 label or the LDL VTOC */ |
| memset(sec, FREE_SPACE_FILLER, sizeof(sec)); |
| if (virtio_read(2, vlbl)) { |
| puts("Cannot read block 2"); |
| return -EIO; |
| } |
| |
| /* |
| * First check for a list-directed-format pointer which would |
| * supersede the CCW pointer. |
| */ |
| if (eckd_valid_address((ExtEckdBlockPtr *)&vlbl->f.br, 0)) { |
| ldipl_bmt = eckd_find_bmt((ExtEckdBlockPtr *)&vlbl->f.br); |
| switch (ldipl_bmt) { |
| case ERROR_BLOCK_NR: |
| return -EIO; |
| case NULL_BLOCK_NR: |
| break; /* Invalid BMT but the device may still boot with CCW-IPL */ |
| default: |
| puts("List-Directed"); |
| /* |
| * LD-IPL does not use the S1B bock, just make it NULL_BLOCK_NR. |
| * In some failure cases retry IPL before aborting. |
| */ |
| if (run_eckd_boot_script(ldipl_bmt, NULL_BLOCK_NR)) { |
| return -EIO; |
| } |
| /* Non-fatal error, retry as CCW-IPL */ |
| printf("Retrying IPL "); |
| print_eckd_msg(); |
| } |
| memset(sec, FREE_SPACE_FILLER, sizeof(sec)); |
| if (virtio_read(2, vtoc)) { |
| puts("Cannot read block 2"); |
| return -EIO; |
| } |
| } |
| |
| /* Not list-directed */ |
| if (magic_match(vtoc->magic, VOL1_MAGIC)) { |
| if (ipl_eckd_cdl()) { |
| return -1; |
| } |
| } |
| |
| if (magic_match(vtoc->magic, CMS1_MAGIC)) { |
| return ipl_eckd_ldl(ECKD_CMS); |
| } |
| if (magic_match(vtoc->magic, LNX1_MAGIC)) { |
| return ipl_eckd_ldl(ECKD_LDL); |
| } |
| |
| if (ipl_eckd_ldl(ECKD_LDL_UNLABELED)) { |
| return -1; |
| } |
| /* |
| * Ok, it is not a LDL by any means. |
| * It still might be a CDL with zero record keys for IPL1 and IPL2 |
| */ |
| return 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; |
| } |
| |
| puts("Using SCSI scheme."); |
| 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; |
| } |
| if (virtio_read(bswap32(s->load_rba), magic_sec)) { |
| puts("Failed to read image sector 0"); |
| return false; |
| } |
| |
| /* 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 long 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; |
| |
| if (virtio_read(ISO_PRIMARY_VD_SECTOR, sec)) { |
| puts("Failed to read ISO primary descriptor"); |
| return -EIO; |
| } |
| |
| sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); |
| dir_rem[0] = 0; |
| sec_offset[0] = 0; |
| |
| while (level >= 0) { |
| if (sec_offset[level] > ISO_SECTOR_SIZE) { |
| puts("Directory tree structure violation"); |
| return -EIO; |
| } |
| |
| cur_record = (IsoDirHdr *)(temp + sec_offset[level]); |
| |
| if (sec_offset[level] == 0) { |
| if (virtio_read(sec_loc[level], temp)) { |
| puts("Failed to read ISO directory"); |
| return -EIO; |
| } |
| 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) { |
| puts("ISO-9660 directory depth limit exceeded"); |
| } 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--; |
| if (virtio_read(sec_loc[level], temp)) { |
| puts("Failed to read ISO directory"); |
| return -EIO; |
| } |
| } |
| } |
| |
| 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; |
| long real_size = iso_get_file_size(bswap32(s.load_rba)); |
| |
| if (real_size > 0) { |
| /* Round up blocks to load */ |
| blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; |
| puts("ISO boot image size verified"); |
| } else { |
| puts("ISO boot image size could not be verified"); |
| if (real_size < 0) { |
| return; |
| } |
| } |
| |
| if (read_iso_boot_image(bswap32(s.load_rba), |
| (void *)((uint64_t)bswap16(s.load_segment)), |
| blks_to_load)) { |
| return; |
| } |
| |
| 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); |
| } |
| } |
| if (virtio_read(block_num++, sec)) { |
| puts("Failed to read ISO volume descriptor"); |
| return 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static IsoBcSection *find_iso_bc_entry(uint32_t offset) |
| { |
| IsoBcEntry *e = (IsoBcEntry *)sec; |
| int i; |
| unsigned int loadparm = get_loadparm_index(); |
| |
| if (!offset) { |
| return NULL; |
| } |
| |
| if (virtio_read(offset, sec)) { |
| puts("Failed to read El Torito boot catalog"); |
| return NULL; |
| } |
| |
| if (!is_iso_bc_valid(e)) { |
| /* The validation entry is mandatory */ |
| 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--; |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static int ipl_iso_el_torito(void) |
| { |
| uint32_t offset = find_iso_bc(); |
| if (!offset) { |
| return 0; |
| } |
| |
| IsoBcSection *s = find_iso_bc_entry(offset); |
| |
| if (s) { |
| load_iso_bc_entry(s); /* only return in error */ |
| return -1; |
| } |
| |
| puts("No suitable boot entry found on ISO-9660 media!"); |
| return -EIO; |
| } |
| |
| /** |
| * Detect whether we're trying to boot from an .ISO image. |
| * These always have a signature string "CD001" at offset 0x8001. |
| */ |
| static bool has_iso_signature(void) |
| { |
| int blksize = virtio_get_block_size(); |
| |
| if (!blksize || virtio_read(0x8000 / blksize, sec)) { |
| return false; |
| } |
| |
| return !memcmp("CD001", &sec[1], 5); |
| } |
| |
| /*********************************************************************** |
| * Bus specific IPL sequences |
| */ |
| |
| static int zipl_load_vblk(void) |
| { |
| int blksize = virtio_get_block_size(); |
| |
| if (blksize == VIRTIO_ISO_BLOCK_SIZE || has_iso_signature()) { |
| if (blksize != VIRTIO_ISO_BLOCK_SIZE) { |
| virtio_assume_iso9660(); |
| } |
| if (ipl_iso_el_torito()) { |
| return 0; |
| } |
| } |
| |
| if (blksize != VIRTIO_DASD_DEFAULT_BLOCK_SIZE) { |
| puts("Using guessed DASD geometry."); |
| virtio_assume_eckd(); |
| } |
| return ipl_eckd(); |
| } |
| |
| static int zipl_load_vscsi(void) |
| { |
| if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { |
| /* Is it an ISO image in non-CD drive? */ |
| if (ipl_iso_el_torito()) { |
| return 0; |
| } |
| } |
| |
| puts("Using guessed DASD geometry."); |
| virtio_assume_eckd(); |
| return 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) { |
| netmain(); |
| } |
| |
| 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"); |
| } |
| |
| puts("zIPL load failed."); |
| } |
