Messages in this thread Patch in this message | | | From | Michael Mueller <> | Subject | [PATCH v4 14/15] target-s390x: Introduce facility test routine | Date | Mon, 30 Mar 2015 16:28:27 +0200 |
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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 | 29 +++++++++++++++++++++++++++++ target-s390x/cpu-models.h | 1 + 2 files changed, 30 insertions(+)
diff --git a/target-s390x/cpu-models.c b/target-s390x/cpu-models.c index aba44dd..a9f7372 100644 --- a/target-s390x/cpu-models.c +++ b/target-s390x/cpu-models.c @@ -736,3 +736,32 @@ 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: 2.4 + */ +bool s390_test_facility(S390CPUClass *cc, uint16_t nr) +{ + if (!cc) { + return false; + } + return test_facility(cc->fac_list[ACCEL_CURRENT], nr) ? true : false; +} diff --git a/target-s390x/cpu-models.h b/target-s390x/cpu-models.h index 4734c58..eb0476f 100644 --- a/target-s390x/cpu-models.h +++ b/target-s390x/cpu-models.h @@ -120,6 +120,7 @@ uint64_t *s390_fac_list_mask_by_machine(const char *name); uint64_t *s390_current_fac_list_mask(void); void s390_cpu_model_init(S390CPUClass *cc); bool s390_cpu_models_used(void); +bool s390_test_facility(S390CPUClass *cc, uint16_t nr); extern uint64_t qemu_s390_fac_list_mask[]; -- 1.8.3.1
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