X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Fpc-bios%2Fs390-ccw%2Fbootmap.c;fp=qemu%2Fpc-bios%2Fs390-ccw%2Fbootmap.c;h=b678d5ebb83b2132651a3a488bf1aa750272aec5;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/pc-bios/s390-ccw/bootmap.c b/qemu/pc-bios/s390-ccw/bootmap.c
new file mode 100644
index 000000000..b678d5ebb
--- /dev/null
+++ b/qemu/pc-bios/s390-ccw/bootmap.c
@@ -0,0 +1,495 @@
+/*
+ * 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");
+}