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pc-bios/s390-ccw: enhance bootmap detection 

Improve the algorithm that tries to guess the disk layout:
1. Use CD-ROMs to read ISO only
2. Make explicit paths for -scsi and -blk virtio

Acked-by: Maxim Samoylov <max7255@linux.vnet.ibm.com>
Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2015-10-30 17:28:48 +01:00 committed by Cornelia Huck
parent 80ba3e249b
commit f038682044
1 changed files with 76 additions and 35 deletions
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111
pc-bios/s390-ccw/bootmap.c
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@ -315,6 +315,40 @@ static void print_eckd_msg(void)
sclp_print(msg);
}
static void ipl_eckd(void)
{
ScsiMbr *mbr = (void *)sec;
LDL_VTOC *vlbl = (void *)sec;
print_eckd_msg();
/* Grab the MBR again */
memset(sec, FREE_SPACE_FILLER, sizeof(sec));
read_block(0, mbr, "Cannot read block 0 on DASD");
if (magic_match(mbr->magic, IPL1_MAGIC)) {
ipl_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_ldl(ECKD_CMS); /* no return */
}
if (magic_match(vlbl->magic, LNX1_MAGIC)) {
ipl_eckd_ldl(ECKD_LDL); /* no return */
}
ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */
/*
* Ok, it is not a LDL by any means.
* It still might be a CDL with zero record keys for IPL1 and IPL2
*/
ipl_eckd_cdl();
}
/***********************************************************************
* IPL a SCSI disk
*/
@ -412,7 +446,13 @@ static void ipl_scsi(void)
const int pte_len = sizeof(ScsiBlockPtr);
ScsiBlockPtr *prog_table_entry;
/* The 0-th block (MBR) was already read into sec[] */
/* Grab the MBR */
memset(sec, FREE_SPACE_FILLER, sizeof(sec));
read_block(0, mbr, "Cannot read block 0");
if (!magic_match(mbr->magic, ZIPL_MAGIC)) {
return;
}
sclp_print("Using SCSI scheme.\n");
debug_print_int("MBR Version", mbr->version_id);
@ -649,57 +689,58 @@ static void ipl_iso_el_torito(void)
}
/***********************************************************************
* IPL starts here
* Bus specific IPL sequences
*/
void zipl_load(void)
static void zipl_load_vblk(void)
{
ScsiMbr *mbr = (void *)sec;
LDL_VTOC *vlbl = (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 */
}
/* Check if we can boot as ISO media */
if (virtio_guessed_disk_nature()) {
virtio_assume_iso9660();
}
ipl_iso_el_torito();
/* We have failed to follow the SCSI scheme, so */
if (virtio_guessed_disk_nature()) {
sclp_print("Using guessed DASD geometry.\n");
virtio_assume_eckd();
}
print_eckd_msg();
if (magic_match(mbr->magic, IPL1_MAGIC)) {
ipl_eckd_cdl(); /* no return */
ipl_eckd();
}
static void zipl_load_vscsi(void)
{
if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) {
/* Is it an ISO image in non-CD drive? */
ipl_iso_el_torito();
}
/* LDL/CMS? */
memset(sec, FREE_SPACE_FILLER, sizeof(sec));
read_block(2, vlbl, "Cannot read block 2");
sclp_print("Using guessed DASD geometry.\n");
virtio_assume_eckd();
ipl_eckd();
}
if (magic_match(vlbl->magic, CMS1_MAGIC)) {
ipl_eckd_ldl(ECKD_CMS); /* no return */
}
if (magic_match(vlbl->magic, LNX1_MAGIC)) {
ipl_eckd_ldl(ECKD_LDL); /* no return */
/***********************************************************************
* IPL starts here
*/
void zipl_load(void)
{
if (virtio_get_device()->is_cdrom) {
ipl_iso_el_torito();
panic("\n! Cannot IPL this ISO image !\n");
}
ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */
/*
* Ok, it is not a LDL by any means.
* It still might be a CDL with zero record keys for IPL1 and IPL2
*/
ipl_eckd_cdl();
ipl_scsi();
switch (virtio_get_device_type()) {
case VIRTIO_ID_BLOCK:
zipl_load_vblk();
break;
case VIRTIO_ID_SCSI:
zipl_load_vscsi();
break;
default:
panic("\n! Unknown IPL device type !\n");
}
panic("\n* this can never happen *\n");
}