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 20:05:40 +02:00
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/* #define DEBUG_FALLBACK */
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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 20:10:27 +02:00
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static uint8_t sec[MAX_SECTOR_SIZE]
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__attribute__((__aligned__(MAX_SECTOR_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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/*
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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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2013-04-22 21:02:49 +02:00
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/* Check for ZIPL magic. Returns 0 if not matched. */
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static int zipl_magic(uint8_t *ptr)
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{
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2014-05-19 20:05:40 +02:00
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uint32_t *p = (void *)ptr;
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uint32_t *z = (void *)ZIPL_MAGIC;
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2013-04-22 21:02:49 +02:00
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if (*p != *z) {
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debug_print_int("invalid magic", *p);
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virtio_panic("invalid magic");
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}
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return 1;
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}
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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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2013-04-22 21:02:49 +02:00
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long address;
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int i;
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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 20:11:07 +02:00
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debug_print_int("reading bprs at", blockno);
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read_block(blockno, bprs, "zipl_load_segment: cannot read block");
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2013-04-22 21:02:49 +02:00
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for (i = 0;; i++) {
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2014-05-19 20:05:40 +02:00
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u64 *cur_desc = (void *)&bprs[i];
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2013-04-22 21:02:49 +02:00
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blockno = bprs[i].blockno;
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2014-05-19 20:05:40 +02:00
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if (!blockno) {
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2013-04-22 21:02:49 +02:00
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break;
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2014-05-19 20:05:40 +02:00
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}
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2013-04-22 21:02:49 +02:00
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/* we need the updated blockno for the next indirect entry in the
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chain, but don't want to advance address */
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2014-05-19 20:05:40 +02:00
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if (i == (max_entries - 1)) {
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2013-04-22 21:02:49 +02:00
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break;
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2014-05-19 20:05:40 +02:00
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}
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2013-04-22 21:02:49 +02:00
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2014-06-18 14:16:46 +02:00
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if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1],
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2014-05-19 20:08:54 +02:00
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sizeof(ScsiBlockPtr))) {
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2014-06-18 14:16:46 +02:00
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/* This is a "continue" pointer.
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* This ptr is the last one in the current script section.
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* I.e. the next ptr must point to the unused memory area.
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* The blockno is not zero, so the upper loop must continue
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* reading next section of BPRS.
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*/
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break;
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}
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2013-04-22 21:02:49 +02:00
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address = virtio_load_direct(cur_desc[0], cur_desc[1], 0,
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2014-05-19 20:05:40 +02:00
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(void *)address);
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2014-05-19 20:11:07 +02:00
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IPL_assert(address != -1, "zipl_load_segment: wrong IPL address");
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2013-04-22 21:02:49 +02:00
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}
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} while (blockno);
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}
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/* Run a zipl program */
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2014-05-19 20:11:07 +02:00
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static void zipl_run(ScsiBlockPtr *pte)
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2013-04-22 21:02:49 +02:00
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{
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2014-05-19 20:08:54 +02:00
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ComponentHeader *header;
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ComponentEntry *entry;
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2014-05-19 20:10:27 +02:00
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uint8_t tmp_sec[MAX_SECTOR_SIZE];
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2013-04-22 21:02:49 +02:00
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virtio_read(pte->blockno, tmp_sec);
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2014-05-19 20:08:54 +02:00
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header = (ComponentHeader *)tmp_sec;
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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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IPL_assert(zipl_magic(tmp_sec), "zipl_run: zipl_magic");
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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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IPL_assert(header->type == ZIPL_COMP_HEADER_IPL,
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"zipl_run: wrong header type");
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2013-04-22 21:02:49 +02:00
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dputs("start loading images\n");
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/* Load image(s) into RAM */
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2014-05-19 20:08:54 +02:00
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entry = (ComponentEntry *)(&header[1]);
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2013-04-22 21:02:49 +02:00
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while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) {
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2014-05-19 20:11:07 +02:00
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zipl_load_segment(entry);
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2013-04-22 21:02:49 +02:00
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entry++;
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2014-05-19 20:11:07 +02:00
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IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE),
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"zipl_run: wrong entry size");
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2013-04-22 21:02:49 +02:00
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}
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2014-05-19 20:11:07 +02:00
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IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC,
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"zipl_run: no EXEC entry");
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2013-04-22 21:02:49 +02:00
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/* should not return */
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2014-06-18 14:16:45 +02:00
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jump_to_IPL_code(entry->load_address);
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2013-04-22 21:02:49 +02:00
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}
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2014-05-19 20:11:07 +02:00
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void zipl_load(void)
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2013-04-22 21:02:49 +02:00
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{
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2014-05-19 20:08:54 +02:00
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ScsiMbr *mbr = (void *)sec;
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2013-04-22 21:02:49 +02:00
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uint8_t *ns, *ns_end;
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int program_table_entries = 0;
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2014-05-19 20:08:54 +02:00
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const int pte_len = sizeof(ScsiBlockPtr);
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ScsiBlockPtr *prog_table_entry;
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2013-04-22 21:02:49 +02:00
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/* Grab the MBR */
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2014-05-19 20:11:07 +02:00
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read_block(0, mbr, "zipl_load: cannot read block 0");
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2013-04-22 21:02:49 +02:00
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dputs("checking magic\n");
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2014-05-19 20:11:07 +02:00
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IPL_assert(zipl_magic(mbr->magic), "zipl_load: zipl_magic 1");
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2013-04-22 21:02:49 +02:00
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debug_print_int("program table", mbr->blockptr.blockno);
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/* Parse the program table */
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2014-05-19 20:11:07 +02:00
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read_block(mbr->blockptr.blockno, sec,
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"zipl_load: cannot read program table");
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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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IPL_assert(zipl_magic(sec), "zipl_load: zipl_magic 2");
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2013-04-22 21:02:49 +02:00
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2014-05-19 20:10:27 +02:00
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ns_end = sec + virtio_get_block_size();
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2013-04-22 21:02:49 +02:00
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for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns++) {
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2014-05-19 20:08:54 +02:00
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prog_table_entry = (ScsiBlockPtr *)ns;
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2013-04-22 21:02:49 +02:00
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if (!prog_table_entry->blockno) {
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break;
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}
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program_table_entries++;
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}
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debug_print_int("program table entries", program_table_entries);
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2014-05-19 20:11:07 +02:00
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IPL_assert(program_table_entries, "zipl_load: no program table");
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2013-04-22 21:02:49 +02:00
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/* Run the default entry */
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2014-05-19 20:08:54 +02:00
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prog_table_entry = (ScsiBlockPtr *)(sec + pte_len);
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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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zipl_run(prog_table_entry); /* no return */
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2013-04-22 21:02:49 +02:00
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}
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