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S390: BIOS boot from given device

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Use the passed device, if there is no device, use the first applicable device.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Dominik Dingel 2013-04-30 07:15:58 +00:00 committed by Alexander Graf
parent ba1509c0a9
commit ff151f4ec9
2 changed files with 20 additions and 6 deletions
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18
pc-bios/s390-ccw/main.c
View File

@ -12,6 +12,7 @@
struct subchannel_id blk_schid;
char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
uint64_t boot_value;
void virtio_panic(const char *string)
{
@ -20,15 +21,22 @@ void virtio_panic(const char *string)
while (1) { }
}
static void virtio_setup(void)
static void virtio_setup(uint64_t dev_info)
{
struct schib schib;
int i;
int r;
bool found = false;
bool check_devno = false;
uint16_t dev_no = -1;
blk_schid.one = 1;
if (dev_info != -1) {
check_devno = true;
dev_no = dev_info & 0xffff;
debug_print_int("device no. ", dev_no);
}
for (i = 0; i < 0x10000; i++) {
blk_schid.sch_no = i;
r = stsch_err(blk_schid, &schib);
@ -36,12 +44,14 @@ static void virtio_setup(void)
break;
}
if (schib.pmcw.dnv) {
if (!check_devno || (schib.pmcw.dev == dev_no)) {
if (virtio_is_blk(blk_schid)) {
found = true;
break;
}
}
}
}
if (!found) {
virtio_panic("No virtio-blk device found!\n");
@ -53,7 +63,9 @@ static void virtio_setup(void)
int main(void)
{
sclp_setup();
virtio_setup();
debug_print_int("boot reg[7] ", boot_value);
virtio_setup(boot_value);
if (zipl_load() < 0)
sclp_print("Failed to load OS from hard disk\n");
disabled_wait();

2
pc-bios/s390-ccw/start.S
View File

@ -14,6 +14,8 @@
_start:
larl %r15, stack + 0x8000 /* Set up stack */
larl %r6, boot_value
stg %r7, 0(%r6) /* save the boot_value before any function calls */
j main /* And call C */
/*