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pc-bios/s390-ccw: IPL from LDL/CMS-formatted ECKD DASD 

Add code that allows us to start from two further ECKD DASD disk
layouts: LDL (Linux disk layout) and CMS (cms-formatted disk).

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 20:14:41 +02:00 committed by Cornelia Huck
parent e0aff4aa3f
commit 564e52b96f
2 changed files with 92 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
pc-bios/s390-ccw/bootmap.c
View File

@ -80,6 +80,17 @@ static void jump_to_IPL_code(uint64_t address)
static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */
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 bool eckd_valid_address(BootMapPointer *p)
{
const uint64_t cylinder = p->eckd.cylinder
@ -198,19 +209,15 @@ static void run_eckd_boot_script(block_number_t mbr_block_nr)
jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
}
static void ipl_eckd(void)
static void ipl_eckd_cdl(void)
{
XEckdMbr *mbr;
Ipl2 *ipl2 = (void *)sec;
IplVolumeLabel *vlbl = (void *)sec;
block_number_t block_nr;
sclp_print("Using ECKD scheme.\n");
if (virtio_guessed_disk_nature()) {
sclp_print("Using guessed DASD geometry.\n");
virtio_assume_eckd();
}
/* 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");
@ -238,6 +245,57 @@ static void ipl_eckd(void)
/* no return */
}
static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
{
LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */
char msg[4] = { '?', '.', '\n', '\0' };
block_number_t block_nr;
BootInfo *bip;
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);
/* 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");
bip = (void *)(sec + 0x70); /* "boot info" is "eckd mbr" for LDL */
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 ipl_eckd(ECKD_IPL_mode_t mode)
{
switch (mode) {
case ECKD_CDL:
ipl_eckd_cdl(); /* no return */
case ECKD_CMS:
case ECKD_LDL:
ipl_eckd_ldl(mode); /* no return */
default:
virtio_panic("\n! Unknown ECKD IPL mode !\n");
}
}
/***********************************************************************
* IPL a SCSI disk
*/
@ -374,6 +432,7 @@ static void ipl_scsi(void)
void zipl_load(void)
{
ScsiMbr *mbr = (void *)sec;
LDL_VTOC *vlbl = (void *)sec;
/* Grab the MBR */
memset(sec, FREE_SPACE_FILLER, sizeof(sec));
@ -384,8 +443,27 @@ void zipl_load(void)
if (magic_match(mbr->magic, ZIPL_MAGIC)) {
ipl_scsi(); /* no return */
}
/* 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();
}
if (magic_match(mbr->magic, IPL1_MAGIC)) {
ipl_eckd(); /* CDL ECKD; no return */
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 */
}
virtio_panic("\n* invalid MBR magic *\n");

7
pc-bios/s390-ccw/bootmap.h
View File

@ -255,6 +255,13 @@ typedef struct IplVolumeLabel {
};
} __attribute__((packed)) IplVolumeLabel;
typedef enum {
ECKD_NO_IPL,
ECKD_CDL,
ECKD_CMS,
ECKD_LDL,
} ECKD_IPL_mode_t;
/* utility code below */
static inline void IPL_assert(bool term, const char *message)