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pc-bios/s390-ccw: Get device address via diag 308/6

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To IPL from a device, pc-bios receives from qemu a device address via
general register 7. The better way to do it is to use diag308/6
instruction which returns so called
"IplParameterBlock". IplParameterBlock contains the device address for
IPL and additional parameters that can be used by pc-bios.

This patch allows pc-bios to get device address via diag308/6 and
doesn't use gr7 passed boot information anymore.

Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Alexander Yarygin 2015-07-31 17:04:51 +03:00 • committed by Cornelia Huck
parent 3041e3bead
commit d046c51dad
4 changed files with 95 additions and 13 deletions
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2
pc-bios/s390-ccw/start.S
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@ -14,8 +14,6 @@
_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 */
/*