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pc-bios/s390-ccw: store proper subsystem information word

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POP chapter 17 requires to store a subsystem information word at 184
during IPL. Furthermore bytes 188-191 should be zero. The bootmap might
contain data blocks that are written to the first page. We have to
write these values after we processed the bootmap and before the final
IPL.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2014-07-01 12:17:41 +02:00 • committed by Cornelia Huck
parent eaa4980185
commit f2879a5c9e
3 changed files with 19 additions and 1 deletions
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2
pc-bios/s390-ccw/bootmap.c
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@ -51,6 +51,8 @@ static void jump_to_IPL_2(void)
static void jump_to_IPL_code(uint64_t address)
{
/* store the subsystem information _after_ the bootmap was loaded */
write_subsystem_identification();
/*
* The IPL PSW is at address 0. We also must not overwrite the
* content of non-BIOS memory after we loaded the guest, so we