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s390-bios: Use control unit type to determine boot method

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The boot method is different depending on which device type we are
booting from. Let's examine the control unit type to determine if we're
a virtio device. We'll eventually add a case to check for a real dasd device
here as well.

Since we have to call enable_subchannel() in main now, might as well
remove that call from virtio.c : run_ccw(). This requires adding some
additional enable_subchannel calls to not break calls to
virtio_is_supported().

Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1554388475-18329-14-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Jason J. Herne 2019-04-04 10:34:32 -04:00 • committed by Thomas Huth
parent 9de6cbb152
commit 3668cb7ce8
3 changed files with 15 additions and 3 deletions
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16
pc-bios/s390-ccw/main.c
View file

@ -76,6 +76,7 @@ static bool find_subch(int dev_no)
/* Skip net devices since no IPLB is created and therefore no
* network bootloader has been loaded
*/
enable_subchannel(blk_schid);
if (virtio_is_supported(blk_schid) &&
virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
continue;
@ -198,13 +199,24 @@ static void virtio_setup(void)
int main(void)
{
uint16_t cutype;
sclp_setup();
css_setup();
boot_setup();
find_boot_device();
enable_subchannel(blk_schid);
virtio_setup();
zipl_load(); /* no return */
cutype = cu_type(blk_schid);
switch (cutype) {
case CU_TYPE_VIRTIO:
virtio_setup();
zipl_load(); /* no return */
break;
default:
print_int("Attempting to boot from unexpected device type", cutype);
panic("");
}
panic("Failed to load OS from hard disk\n");
return 0; /* make compiler happy */