lkml.org 
[lkml]   [2015]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 15/16] target-s390x: Introduce facility test routine
Date
The patch introduces routine s390_facility_test() which allows to
verify a specific facility bit is set.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
---
target-s390x/cpu-models.c | 30 ++++++++++++++++++++++++++++++
target-s390x/cpu-models.h | 1 +
2 files changed, 31 insertions(+)

diff --git a/target-s390x/cpu-models.c b/target-s390x/cpu-models.c
index 7ad61df..5c4eac5 100644
--- a/target-s390x/cpu-models.c
+++ b/target-s390x/cpu-models.c
@@ -698,3 +698,33 @@ bool s390_cpu_models_used(void)
{
return cpu_models_used;
}
+
+static inline int test_facility(uint64_t *fac_list, uint16_t nr)
+{
+ uint16_t word = nr / BITS_PER_LONG;
+ uint16_t be_bit = (BITS_PER_LONG - 1) - (nr % BITS_PER_LONG);
+
+ return (nr < FAC_LIST_CPU_S390_SIZE_UINT1) ?
+ (fac_list[word] >> be_bit) & __UINT64_C(1) : 0;
+}
+
+/**
+ * s390_test_facility:
+ * @nr: facility bit number to test
+ * @cc: cpu class to test
+ *
+ * The functions tests if the cpu facility identified by bit @nr is available
+ * to the cpu class @cc.
+ *
+ * Returns: a boolean value.
+ *
+ * Since: 2.3
+ */
+bool s390_test_facility(S390CPUClass *cc, uint16_t nr)
+{
+ if (!cc) {
+ return false;
+ }
+ return test_facility(cc->fac_list, nr) ? true : false;
+}
+
diff --git a/target-s390x/cpu-models.h b/target-s390x/cpu-models.h
index 3605aa4..557f5e5 100644
--- a/target-s390x/cpu-models.h
+++ b/target-s390x/cpu-models.h
@@ -116,6 +116,7 @@ bool s390_cpu_classes_initialized(void);
bool s390_probe_mode(void);
void s390_cpu_model_init(S390CPUClass *cc);
bool s390_cpu_models_used(void);
+bool s390_test_facility(S390CPUClass *cc, uint16_t nr);

/*
* bits 0-7 : CMOS generation
--
1.8.3.1


\
 
 \ /
  Last update: 2015-03-02 14:01    [W:0.101 / U:0.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site