2013-04-22 21:02:49 +02:00
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/*
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* QEMU S390 bootmap interpreter
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*
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "s390-ccw.h"
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2014-05-19 20:08:54 +02:00
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#include "bootmap.h"
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2014-05-19 20:10:27 +02:00
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#include "virtio.h"
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2013-04-22 21:02:49 +02:00
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2014-05-19 20:12:43 +02:00
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#ifdef DEBUG
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2014-05-19 20:05:40 +02:00
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/* #define DEBUG_FALLBACK */
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2014-05-19 20:12:43 +02:00
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#endif
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2013-04-22 21:02:49 +02:00
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#ifdef DEBUG_FALLBACK
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#define dputs(txt) \
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do { sclp_print("zipl: " txt); } while (0)
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#else
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#define dputs(fmt, ...) \
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do { } while (0)
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#endif
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/* Scratch space */
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2014-05-19 20:12:43 +02:00
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static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE)));
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2013-04-22 21:02:49 +02:00
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2014-06-18 14:16:45 +02:00
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typedef struct ResetInfo {
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uint32_t ipl_mask;
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uint32_t ipl_addr;
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uint32_t ipl_continue;
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} ResetInfo;
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ResetInfo save;
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static void jump_to_IPL_2(void)
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{
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ResetInfo *current = 0;
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void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue;
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debug_print_addr("set IPL addr to", ipl);
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/* Ensure the guest output starts fresh */
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sclp_print("\n");
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*current = save;
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ipl(); /* should not return */
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}
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static void jump_to_IPL_code(uint64_t address)
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{
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2014-07-01 12:17:41 +02:00
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/* store the subsystem information _after_ the bootmap was loaded */
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write_subsystem_identification();
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2014-06-18 14:16:45 +02:00
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/*
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* The IPL PSW is at address 0. We also must not overwrite the
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* content of non-BIOS memory after we loaded the guest, so we
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* save the original content and restore it in jump_to_IPL_2.
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*/
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ResetInfo *current = 0;
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save = *current;
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current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2;
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current->ipl_continue = address & 0x7fffffff;
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/*
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* HACK ALERT.
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* We use the load normal reset to keep r15 unchanged. jump_to_IPL_2
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* can then use r15 as its stack pointer.
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*/
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asm volatile("lghi 1,1\n\t"
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"diag 1,1,0x308\n\t"
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: : : "1", "memory");
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virtio_panic("\n! IPL returns !\n");
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}
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2014-05-19 20:13:41 +02:00
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/***********************************************************************
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* IPL an ECKD DASD (CDL or LDL/CMS format)
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*/
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static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */
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const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr);
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2014-05-19 20:14:41 +02:00
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static inline void verify_boot_info(BootInfo *bip)
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{
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IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL magic");
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IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version");
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IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL");
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IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD");
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IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch");
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IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size),
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"Bad block size in zIPL section of the 1st record.");
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}
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2014-05-19 20:13:41 +02:00
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static bool eckd_valid_address(BootMapPointer *p)
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{
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const uint64_t cylinder = p->eckd.cylinder
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+ ((p->eckd.head & 0xfff0) << 12);
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const uint64_t head = p->eckd.head & 0x000f;
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if (head >= virtio_get_heads()
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|| p->eckd.sector > virtio_get_sectors()
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|| p->eckd.sector <= 0) {
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return false;
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}
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if (!virtio_guessed_disk_nature() && cylinder >= virtio_get_cylinders()) {
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return false;
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}
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return true;
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}
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static block_number_t eckd_block_num(BootMapPointer *p)
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{
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const uint64_t sectors = virtio_get_sectors();
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const uint64_t heads = virtio_get_heads();
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const uint64_t cylinder = p->eckd.cylinder
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+ ((p->eckd.head & 0xfff0) << 12);
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const uint64_t head = p->eckd.head & 0x000f;
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const block_number_t block = sectors * heads * cylinder
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+ sectors * head
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+ p->eckd.sector
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- 1; /* block nr starts with zero */
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return block;
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}
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static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address)
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{
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block_number_t block_nr;
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int j, rc;
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BootMapPointer *bprs = (void *)_bprs;
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bool more_data;
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memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
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read_block(blk, bprs, "BPRS read failed");
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do {
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more_data = false;
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for (j = 0;; j++) {
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block_nr = eckd_block_num((void *)&(bprs[j].xeckd));
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if (is_null_block_number(block_nr)) { /* end of chunk */
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break;
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}
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/* we need the updated blockno for the next indirect entry
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* in the chain, but don't want to advance address
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*/
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if (j == (max_bprs_entries - 1)) {
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break;
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}
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IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size),
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"bad chunk block size");
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IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr");
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if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]),
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sizeof(EckdBlockPtr))) {
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/* This is a "continue" pointer.
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* This ptr should be the last one in the current
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* script section.
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* I.e. the next ptr must point to the unused memory area
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*/
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memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
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read_block(block_nr, bprs, "BPRS continuation read failed");
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more_data = true;
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break;
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}
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/* Load (count+1) blocks of code at (block_nr)
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* to memory (address).
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*/
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rc = virtio_read_many(block_nr, (void *)(*address),
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bprs[j].xeckd.bptr.count+1);
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IPL_assert(rc == 0, "code chunk read failed");
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*address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size();
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}
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} while (more_data);
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return block_nr;
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}
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static void run_eckd_boot_script(block_number_t mbr_block_nr)
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{
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int i;
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block_number_t block_nr;
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uint64_t address;
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ScsiMbr *scsi_mbr = (void *)sec;
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BootMapScript *bms = (void *)sec;
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(mbr_block_nr, sec, "Cannot read MBR");
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block_nr = eckd_block_num((void *)&(scsi_mbr->blockptr));
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(block_nr, sec, "Cannot read Boot Map Script");
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for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) {
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address = bms->entry[i].address.load_address;
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block_nr = eckd_block_num(&(bms->entry[i].blkptr));
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do {
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block_nr = load_eckd_segments(block_nr, &address);
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} while (block_nr != -1);
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}
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IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC,
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"Unknown script entry type");
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jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
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}
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2014-05-19 20:14:41 +02:00
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static void ipl_eckd_cdl(void)
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2014-05-19 20:13:41 +02:00
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{
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XEckdMbr *mbr;
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Ipl2 *ipl2 = (void *)sec;
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IplVolumeLabel *vlbl = (void *)sec;
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block_number_t block_nr;
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/* we have just read the block #0 and recognized it as "IPL1" */
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2014-05-19 20:14:41 +02:00
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sclp_print("CDL\n");
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2014-05-19 20:13:41 +02:00
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(1, ipl2, "Cannot read IPL2 record at block 1");
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IPL_assert(magic_match(ipl2, IPL2_MAGIC), "No IPL2 record");
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mbr = &ipl2->u.x.mbr;
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IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record.");
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IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size),
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"Bad block size in zIPL section of IPL2 record.");
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IPL_assert(mbr->dev_type == DEV_TYPE_ECKD,
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"Non-ECKD device type in zIPL section of IPL2 record.");
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/* save pointer to Boot Script */
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block_nr = eckd_block_num((void *)&(mbr->blockptr));
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(2, vlbl, "Cannot read Volume Label at block 2");
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IPL_assert(magic_match(vlbl->key, VOL1_MAGIC),
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"Invalid magic of volume label block");
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IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC),
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"Invalid magic of volser block");
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print_volser(vlbl->f.volser);
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run_eckd_boot_script(block_nr);
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/* no return */
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}
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2014-05-19 20:14:41 +02:00
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static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
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{
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LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */
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char msg[4] = { '?', '.', '\n', '\0' };
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block_number_t block_nr;
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BootInfo *bip;
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sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL");
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sclp_print(" version ");
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switch (vlbl->LDL_version) {
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case LDL1_VERSION:
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msg[0] = '1';
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break;
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case LDL2_VERSION:
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msg[0] = '2';
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break;
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default:
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msg[0] = vlbl->LDL_version;
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msg[0] &= 0x0f; /* convert EBCDIC */
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msg[0] |= 0x30; /* to ASCII (digit) */
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msg[1] = '?';
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break;
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}
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sclp_print(msg);
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print_volser(vlbl->volser);
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/* DO NOT read BootMap pointer (only one, xECKD) at block #2 */
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(0, sec, "Cannot read block 0");
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bip = (void *)(sec + 0x70); /* "boot info" is "eckd mbr" for LDL */
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verify_boot_info(bip);
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block_nr = eckd_block_num((void *)&(bip->bp.ipl.bm_ptr.eckd.bptr));
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run_eckd_boot_script(block_nr);
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/* no return */
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}
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static void ipl_eckd(ECKD_IPL_mode_t mode)
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{
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switch (mode) {
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case ECKD_CDL:
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ipl_eckd_cdl(); /* no return */
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case ECKD_CMS:
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case ECKD_LDL:
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ipl_eckd_ldl(mode); /* no return */
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default:
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virtio_panic("\n! Unknown ECKD IPL mode !\n");
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}
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}
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2014-05-19 20:12:43 +02:00
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/***********************************************************************
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* IPL a SCSI disk
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*/
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2013-04-22 21:02:49 +02:00
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2014-05-19 20:11:07 +02:00
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static void zipl_load_segment(ComponentEntry *entry)
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2013-04-22 21:02:49 +02:00
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{
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2014-05-19 20:10:27 +02:00
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const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr));
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2014-05-19 20:08:54 +02:00
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ScsiBlockPtr *bprs = (void *)sec;
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2014-06-18 14:16:46 +02:00
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const int bprs_size = sizeof(sec);
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2014-05-19 20:09:50 +02:00
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block_number_t blockno;
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2014-05-19 20:12:43 +02:00
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uint64_t address;
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2013-04-22 21:02:49 +02:00
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int i;
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2014-05-19 20:12:43 +02:00
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char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ";
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char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */
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2013-04-22 21:02:49 +02:00
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blockno = entry->data.blockno;
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address = entry->load_address;
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debug_print_int("loading segment at block", blockno);
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debug_print_int("addr", address);
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do {
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2014-06-18 14:16:46 +02:00
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memset(bprs, FREE_SPACE_FILLER, bprs_size);
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2014-05-19 20:12:43 +02:00
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fill_hex_val(blk_no, &blockno, sizeof(blockno));
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read_block(blockno, bprs, err_msg);
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2013-04-22 21:02:49 +02:00
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for (i = 0;; i++) {
|
2014-05-19 20:12:43 +02:00
|
|
|
uint64_t *cur_desc = (void *)&bprs[i];
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
blockno = bprs[i].blockno;
|
2014-05-19 20:05:40 +02:00
|
|
|
if (!blockno) {
|
2013-04-22 21:02:49 +02:00
|
|
|
break;
|
2014-05-19 20:05:40 +02:00
|
|
|
}
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
/* we need the updated blockno for the next indirect entry in the
|
|
|
|
chain, but don't want to advance address */
|
2014-05-19 20:05:40 +02:00
|
|
|
if (i == (max_entries - 1)) {
|
2013-04-22 21:02:49 +02:00
|
|
|
break;
|
2014-05-19 20:05:40 +02:00
|
|
|
}
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-06-18 14:16:46 +02:00
|
|
|
if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1],
|
2014-05-19 20:08:54 +02:00
|
|
|
sizeof(ScsiBlockPtr))) {
|
2014-06-18 14:16:46 +02:00
|
|
|
/* 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;
|
|
|
|
}
|
2013-04-22 21:02:49 +02:00
|
|
|
address = virtio_load_direct(cur_desc[0], cur_desc[1], 0,
|
2014-05-19 20:05:40 +02:00
|
|
|
(void *)address);
|
2014-05-19 20:12:43 +02:00
|
|
|
IPL_assert(address != -1, "zIPL load segment failed");
|
2013-04-22 21:02:49 +02:00
|
|
|
}
|
|
|
|
} while (blockno);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Run a zipl program */
|
2014-05-19 20:11:07 +02:00
|
|
|
static void zipl_run(ScsiBlockPtr *pte)
|
2013-04-22 21:02:49 +02:00
|
|
|
{
|
2014-05-19 20:08:54 +02:00
|
|
|
ComponentHeader *header;
|
|
|
|
ComponentEntry *entry;
|
2014-05-19 20:10:27 +02:00
|
|
|
uint8_t tmp_sec[MAX_SECTOR_SIZE];
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
read_block(pte->blockno, tmp_sec, "Cannot read header");
|
2014-05-19 20:08:54 +02:00
|
|
|
header = (ComponentHeader *)tmp_sec;
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic");
|
|
|
|
IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type");
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
dputs("start loading images\n");
|
|
|
|
|
|
|
|
/* Load image(s) into RAM */
|
2014-05-19 20:08:54 +02:00
|
|
|
entry = (ComponentEntry *)(&header[1]);
|
2013-04-22 21:02:49 +02:00
|
|
|
while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) {
|
2014-05-19 20:11:07 +02:00
|
|
|
zipl_load_segment(entry);
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
entry++;
|
|
|
|
|
2014-05-19 20:11:07 +02:00
|
|
|
IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE),
|
2014-05-19 20:12:43 +02:00
|
|
|
"Wrong entry value");
|
2013-04-22 21:02:49 +02:00
|
|
|
}
|
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry");
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
/* should not return */
|
2014-06-18 14:16:45 +02:00
|
|
|
jump_to_IPL_code(entry->load_address);
|
2013-04-22 21:02:49 +02:00
|
|
|
}
|
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
static void ipl_scsi(void)
|
2013-04-22 21:02:49 +02:00
|
|
|
{
|
2014-05-19 20:08:54 +02:00
|
|
|
ScsiMbr *mbr = (void *)sec;
|
2013-04-22 21:02:49 +02:00
|
|
|
uint8_t *ns, *ns_end;
|
|
|
|
int program_table_entries = 0;
|
2014-05-19 20:08:54 +02:00
|
|
|
const int pte_len = sizeof(ScsiBlockPtr);
|
|
|
|
ScsiBlockPtr *prog_table_entry;
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
/* The 0-th block (MBR) was already read into sec[] */
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
sclp_print("Using SCSI scheme.\n");
|
2013-04-22 21:02:49 +02:00
|
|
|
debug_print_int("program table", mbr->blockptr.blockno);
|
|
|
|
|
|
|
|
/* Parse the program table */
|
2014-05-19 20:11:07 +02:00
|
|
|
read_block(mbr->blockptr.blockno, sec,
|
2014-05-19 20:12:43 +02:00
|
|
|
"Error reading Program Table");
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic");
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:10:27 +02:00
|
|
|
ns_end = sec + virtio_get_block_size();
|
2013-04-22 21:02:49 +02:00
|
|
|
for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns++) {
|
2014-05-19 20:08:54 +02:00
|
|
|
prog_table_entry = (ScsiBlockPtr *)ns;
|
2013-04-22 21:02:49 +02:00
|
|
|
if (!prog_table_entry->blockno) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
program_table_entries++;
|
|
|
|
}
|
|
|
|
|
|
|
|
debug_print_int("program table entries", program_table_entries);
|
|
|
|
|
2014-05-19 20:12:43 +02:00
|
|
|
IPL_assert(program_table_entries != 0, "Empty Program Table");
|
2013-04-22 21:02:49 +02:00
|
|
|
|
|
|
|
/* Run the default entry */
|
|
|
|
|
2014-05-19 20:08:54 +02:00
|
|
|
prog_table_entry = (ScsiBlockPtr *)(sec + pte_len);
|
2013-04-22 21:02:49 +02:00
|
|
|
|
2014-05-19 20:11:07 +02:00
|
|
|
zipl_run(prog_table_entry); /* no return */
|
2013-04-22 21:02:49 +02:00
|
|
|
}
|
2014-05-19 20:12:43 +02:00
|
|
|
|
|
|
|
/***********************************************************************
|
|
|
|
* IPL starts here
|
|
|
|
*/
|
|
|
|
|
|
|
|
void zipl_load(void)
|
|
|
|
{
|
|
|
|
ScsiMbr *mbr = (void *)sec;
|
2014-05-19 20:14:41 +02:00
|
|
|
LDL_VTOC *vlbl = (void *)sec;
|
2014-05-19 20:12:43 +02:00
|
|
|
|
|
|
|
/* 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 */
|
|
|
|
}
|
2014-05-19 20:14:41 +02:00
|
|
|
|
|
|
|
/* We have failed to follow the SCSI scheme, so */
|
|
|
|
sclp_print("Using ECKD scheme.\n");
|
|
|
|
if (virtio_guessed_disk_nature()) {
|
|
|
|
sclp_print("Using guessed DASD geometry.\n");
|
|
|
|
virtio_assume_eckd();
|
|
|
|
}
|
|
|
|
|
2014-05-19 20:13:41 +02:00
|
|
|
if (magic_match(mbr->magic, IPL1_MAGIC)) {
|
2014-05-19 20:14:41 +02:00
|
|
|
ipl_eckd(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(ECKD_CMS); /* no return */
|
|
|
|
}
|
|
|
|
if (magic_match(vlbl->magic, LNX1_MAGIC)) {
|
|
|
|
ipl_eckd(ECKD_LDL); /* no return */
|
2014-05-19 20:13:41 +02:00
|
|
|
}
|
2014-05-19 20:12:43 +02:00
|
|
|
|
|
|
|
virtio_panic("\n* invalid MBR magic *\n");
|
|
|
|
}
|