--- /dev/null
+/*
+ * 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 "s390-ccw.h"
+#include "bootmap.h"
+#include "virtio.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)));
+
+typedef struct ResetInfo {
+ uint32_t ipl_mask;
+ uint32_t ipl_addr;
+ uint32_t ipl_continue;
+} ResetInfo;
+
+static ResetInfo save;
+
+static void jump_to_IPL_2(void)
+{
+ ResetInfo *current = 0;
+
+ void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue;
+ *current = save;
+ ipl(); /* should not return */
+}
+
+static void jump_to_IPL_code(uint64_t address)
+{
+ /* store the subsystem information _after_ the bootmap was loaded */
+ write_subsystem_identification();
+ /*
+ * The IPL PSW is at address 0. We also must not overwrite the
+ * content of non-BIOS memory after we loaded the guest, so we
+ * save the original content and restore it in jump_to_IPL_2.
+ */
+ ResetInfo *current = 0;
+
+ save = *current;
+ current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2;
+ current->ipl_continue = address & 0x7fffffff;
+
+ debug_print_int("set IPL addr to", current->ipl_continue);
+
+ /* Ensure the guest output starts fresh */
+ sclp_print("\n");
+
+ /*
+ * HACK ALERT.
+ * We use the load normal reset to keep r15 unchanged. jump_to_IPL_2
+ * can then use r15 as its stack pointer.
+ */
+ asm volatile("lghi 1,1\n\t"
+ "diag 1,1,0x308\n\t"
+ : : : "1", "memory");
+ virtio_panic("\n! IPL returns !\n");
+}
+
+/***********************************************************************
+ * 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 inline void verify_boot_info(BootInfo *bip)
+{
+ IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL magic");
+ 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(BootMapPointer *p)
+{
+ const uint64_t sectors = virtio_get_sectors();
+ const uint64_t heads = virtio_get_heads();
+ const uint64_t cylinder = p->eckd.cylinder
+ + ((p->eckd.head & 0xfff0) << 12);
+ const uint64_t head = p->eckd.head & 0x000f;
+ const block_number_t block = sectors * heads * cylinder
+ + sectors * head
+ + p->eckd.sector
+ - 1; /* block nr starts with zero */
+ return block;
+}
+
+static bool eckd_valid_address(BootMapPointer *p)
+{
+ const uint64_t head = p->eckd.head & 0x000f;
+
+ if (head >= virtio_get_heads()
+ || p->eckd.sector > virtio_get_sectors()
+ || p->eckd.sector <= 0) {
+ return false;
+ }
+
+ if (!virtio_guessed_disk_nature() &&
+ eckd_block_num(p) >= 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((void *)&(bprs[j].xeckd));
+ 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 void run_eckd_boot_script(block_number_t mbr_block_nr)
+{
+ int i;
+ block_number_t block_nr;
+ uint64_t address;
+ ScsiMbr *scsi_mbr = (void *)sec;
+ BootMapScript *bms = (void *)sec;
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(mbr_block_nr, sec, "Cannot read MBR");
+
+ block_nr = eckd_block_num((void *)&(scsi_mbr->blockptr));
+
+ 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; i++) {
+ address = bms->entry[i].address.load_address;
+ block_nr = eckd_block_num(&(bms->entry[i].blkptr));
+
+ 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");
+ jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
+}
+
+static void ipl_eckd_cdl(void)
+{
+ XEckdMbr *mbr;
+ Ipl2 *ipl2 = (void *)sec;
+ IplVolumeLabel *vlbl = (void *)sec;
+ block_number_t 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->u.x.mbr;
+ IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record.");
+ IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size),
+ "Bad block size in zIPL section of IPL2 record.");
+ IPL_assert(mbr->dev_type == DEV_TYPE_ECKD,
+ "Non-ECKD device type in zIPL section of IPL2 record.");
+
+ /* save pointer to Boot Script */
+ block_nr = eckd_block_num((void *)&(mbr->blockptr));
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(2, vlbl, "Cannot read Volume Label at block 2");
+ IPL_assert(magic_match(vlbl->key, VOL1_MAGIC),
+ "Invalid magic of volume label block");
+ IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC),
+ "Invalid magic of volser block");
+ print_volser(vlbl->f.volser);
+
+ run_eckd_boot_script(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] = vlbl->LDL_version;
+ msg[0] &= 0x0f; /* convert EBCDIC */
+ msg[0] |= 0x30; /* to ASCII (digit) */
+ msg[1] = '?';
+ break;
+ }
+ sclp_print(msg);
+ print_volser(vlbl->volser);
+}
+
+static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
+{
+ block_number_t block_nr;
+ BootInfo *bip = (void *)(sec + 0x70); /* BootInfo is MBR for LDL */
+
+ 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(bip->magic, ZIPL_MAGIC)) {
+ return; /* not applicable layout */
+ }
+ sclp_print("unlabeled LDL.\n");
+ }
+ verify_boot_info(bip);
+
+ block_nr = eckd_block_num((void *)&(bip->bp.ipl.bm_ptr.eckd.bptr));
+ run_eckd_boot_script(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);
+}
+
+/***********************************************************************
+ * 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->load_address;
+
+ 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");
+ 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) {
+ 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 */
+ jump_to_IPL_code(entry->load_address);
+}
+
+static void ipl_scsi(void)
+{
+ ScsiMbr *mbr = (void *)sec;
+ uint8_t *ns, *ns_end;
+ int program_table_entries = 0;
+ const int pte_len = sizeof(ScsiBlockPtr);
+ ScsiBlockPtr *prog_table_entry;
+
+ /* The 0-th block (MBR) was already read into sec[] */
+
+ sclp_print("Using SCSI scheme.\n");
+ debug_print_int("program table", mbr->blockptr.blockno);
+
+ /* Parse the program table */
+ read_block(mbr->blockptr.blockno, sec,
+ "Error reading Program Table");
+
+ IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic");
+
+ ns_end = sec + virtio_get_block_size();
+ for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns++) {
+ prog_table_entry = (ScsiBlockPtr *)ns;
+ if (!prog_table_entry->blockno) {
+ break;
+ }
+
+ program_table_entries++;
+ }
+
+ debug_print_int("program table entries", program_table_entries);
+
+ IPL_assert(program_table_entries != 0, "Empty Program Table");
+
+ /* Run the default entry */
+
+ prog_table_entry = (ScsiBlockPtr *)(sec + pte_len);
+
+ zipl_run(prog_table_entry); /* no return */
+}
+
+/***********************************************************************
+ * IPL starts here
+ */
+
+void zipl_load(void)
+{
+ ScsiMbr *mbr = (void *)sec;
+ LDL_VTOC *vlbl = (void *)sec;
+
+ /* Grab the MBR */
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(0, mbr, "Cannot read block 0");
+
+ dputs("checking magic\n");
+
+ if (magic_match(mbr->magic, ZIPL_MAGIC)) {
+ ipl_scsi(); /* no return */
+ }
+
+ /* We have failed to follow the SCSI scheme, so */
+ if (virtio_guessed_disk_nature()) {
+ sclp_print("Using guessed DASD geometry.\n");
+ virtio_assume_eckd();
+ }
+ print_eckd_msg();
+ if (magic_match(mbr->magic, IPL1_MAGIC)) {
+ ipl_eckd_cdl(); /* no 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();
+
+ virtio_panic("\n* this can never happen *\n");
+}
Code Review / kvmfornfv.git / blobdiff