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/*
* 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"
/* #define DEBUG_FALLBACK */
#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]
__attribute__((__aligned__(MAX_SECTOR_SIZE)));
typedef struct ResetInfo {
uint32_t ipl_mask;
uint32_t ipl_addr;
uint32_t ipl_continue;
} ResetInfo;
ResetInfo save;
static void jump_to_IPL_2(void)
{
ResetInfo *current = 0;
void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue;
debug_print_addr("set IPL addr to", ipl);
/* Ensure the guest output starts fresh */
sclp_print("\n");
*current = save;
ipl(); /* should not return */
}
static void jump_to_IPL_code(uint64_t address)
{
/*
* 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;
/*
* 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");
}
/* Check for ZIPL magic. Returns 0 if not matched. */
static int zipl_magic(uint8_t *ptr)
{
uint32_t *p = (void *)ptr;
uint32_t *z = (void *)ZIPL_MAGIC;
if (*p != *z) {
debug_print_int("invalid magic", *p);
virtio_panic("invalid magic");
}
return 1;
}
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;
long address;
int i;
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);
debug_print_int("reading bprs at", blockno);
read_block(blockno, bprs, "zipl_load_segment: cannot read block");
for (i = 0;; i++) {
u64 *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: wrong IPL address");
}
} while (blockno);
}
/* Run a zipl program */
static void zipl_run(ScsiBlockPtr *pte)
{
ComponentHeader *header;
ComponentEntry *entry;
uint8_t tmp_sec[MAX_SECTOR_SIZE];
virtio_read(pte->blockno, tmp_sec);
header = (ComponentHeader *)tmp_sec;
IPL_assert(zipl_magic(tmp_sec), "zipl_run: zipl_magic");
IPL_assert(header->type == ZIPL_COMP_HEADER_IPL,
"zipl_run: wrong 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),
"zipl_run: wrong entry size");
}
IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC,
"zipl_run: no EXEC entry");
/* should not return */
jump_to_IPL_code(entry->load_address);
}
void zipl_load(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;
/* Grab the MBR */
read_block(0, mbr, "zipl_load: cannot read block 0");
dputs("checking magic\n");
IPL_assert(zipl_magic(mbr->magic), "zipl_load: zipl_magic 1");
debug_print_int("program table", mbr->blockptr.blockno);
/* Parse the program table */
read_block(mbr->blockptr.blockno, sec,
"zipl_load: cannot read program table");
IPL_assert(zipl_magic(sec), "zipl_load: zipl_magic 2");
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, "zipl_load: no program table");
/* Run the default entry */
prog_table_entry = (ScsiBlockPtr *)(sec + pte_len);
zipl_run(prog_table_entry); /* no return */
}
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