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pc-bios/s390-ccw: factor out ipl code

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Move the scsi-disk specific ipl code from zipl_load() into a new
function ipl_scsi(). This makes it easier to add ipl routines for other
disk types.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2014-05-19 20:12:43 +02:00 committed by Cornelia Huck
parent 058cc1f311
commit a00b33d9e2
1 changed files with 45 additions and 38 deletions
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83
pc-bios/s390-ccw/bootmap.c
View File

@ -12,7 +12,9 @@
#include "bootmap.h"
#include "virtio.h"
#ifdef DEBUG
/* #define DEBUG_FALLBACK */
#endif
#ifdef DEBUG_FALLBACK
#define dputs(txt) \
@ -23,8 +25,7 @@
#endif
/* Scratch space */
static uint8_t sec[MAX_SECTOR_SIZE]
__attribute__((__aligned__(MAX_SECTOR_SIZE)));
static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE)));
typedef struct ResetInfo {
uint32_t ipl_mask;
@ -72,19 +73,9 @@ static void jump_to_IPL_code(uint64_t address)
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;
}
/***********************************************************************
* IPL a SCSI disk
*/
static void zipl_load_segment(ComponentEntry *entry)
{
@ -92,8 +83,10 @@ static void zipl_load_segment(ComponentEntry *entry)
ScsiBlockPtr *bprs = (void *)sec;
const int bprs_size = sizeof(sec);
block_number_t blockno;
long address;
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;
@ -103,11 +96,11 @@ static void zipl_load_segment(ComponentEntry *entry)
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");
fill_hex_val(blk_no, &blockno, sizeof(blockno));
read_block(blockno, bprs, err_msg);
for (i = 0;; i++) {
u64 *cur_desc = (void *)&bprs[i];
uint64_t *cur_desc = (void *)&bprs[i];
blockno = bprs[i].blockno;
if (!blockno) {
@ -132,7 +125,7 @@ static void zipl_load_segment(ComponentEntry *entry)
}
address = virtio_load_direct(cur_desc[0], cur_desc[1], 0,
(void *)address);
IPL_assert(address != -1, "zipl_load_segment: wrong IPL address");
IPL_assert(address != -1, "zIPL load segment failed");
}
} while (blockno);
}
@ -144,13 +137,11 @@ static void zipl_run(ScsiBlockPtr *pte)
ComponentEntry *entry;
uint8_t tmp_sec[MAX_SECTOR_SIZE];
virtio_read(pte->blockno, tmp_sec);
read_block(pte->blockno, tmp_sec, "Cannot read header");
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");
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");
@ -162,17 +153,16 @@ static void zipl_run(ScsiBlockPtr *pte)
entry++;
IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE),
"zipl_run: wrong entry size");
"Wrong entry value");
}
IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC,
"zipl_run: no EXEC entry");
IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry");
/* should not return */
jump_to_IPL_code(entry->load_address);
}
void zipl_load(void)
static void ipl_scsi(void)
{
ScsiMbr *mbr = (void *)sec;
uint8_t *ns, *ns_end;
@ -180,20 +170,16 @@ void zipl_load(void)
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");
/* 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,
"zipl_load: cannot read program table");
"Error reading Program Table");
IPL_assert(zipl_magic(sec), "zipl_load: zipl_magic 2");
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++) {
@ -207,7 +193,7 @@ void zipl_load(void)
debug_print_int("program table entries", program_table_entries);
IPL_assert(program_table_entries, "zipl_load: no program table");
IPL_assert(program_table_entries != 0, "Empty Program Table");
/* Run the default entry */
@ -215,3 +201,24 @@ void zipl_load(void)
zipl_run(prog_table_entry); /* no return */
}
/***********************************************************************
* IPL starts here
*/
void zipl_load(void)
{
ScsiMbr *mbr = (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 */
}
virtio_panic("\n* invalid MBR magic *\n");
}