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s390/setup: set control program code via diag 318

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The s390x diagnose 318 instruction sets the control program name code (CPNC)
and control program version code (CPVC) to provide useful information
regarding the OS during debugging. The CPNC is explicitly set to 4 to
indicate a Linux/KVM environment.

The CPVC is a 7-byte value containing:

 - 3-byte Linux version code, currently set to 0
 - 3-byte unique value, currently set to 0
 - 1-byte trailing null

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1544135405-22385-2-git-send-email-walling@linux.ibm.com>
[set version code to 0 until the structure is fully defined]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Collin Walling
2018-12-06 17:30:04 -05:00
committed by Martin Schwidefsky
parent 58661489a8
commit 4ad78b8651
6 changed files with 40 additions and 1 deletions
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4
drivers/s390/char/sclp.h
View File

@@ -195,7 +195,9 @@ struct read_info_sccb {
u16 hcpua; /* 120-121 */
u8 _pad_122[124 - 122]; /* 122-123 */
u32 hmfai; /* 124-127 */
u8 _pad_128[4096 - 128]; /* 128-4095 */
u8 _pad_128[134 - 128]; /* 128-133 */
u8 byte_134; /* 134 */
u8 _pad_135[4096 - 135]; /* 135-4095 */
} __packed __aligned(PAGE_SIZE);
struct read_storage_sccb {

2
drivers/s390/char/sclp_early.c
View File

@@ -44,6 +44,8 @@ static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
if (sccb->fac91 & 0x40)
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
if (sccb->cpuoff > 134)
sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
sclp.rzm <<= 20;