diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-10-25 16:10:51 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-10-25 16:10:21 +0200 |
| commit | 14375bc4eb8dd0fb0e765390650564c35bb31068 (patch) | |
| tree | 27200620658245c582ee9497fc969a082b304cab /arch/s390/kernel/setup.c | |
| parent | eca577ef5989d25dedc6b0fae3c4622ceaee8005 (diff) | |
[S390] cleanup facility list handling
Store the facility list once at system startup with stfl/stfle and
reuse the result for all facility tests.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 9071e984dcf..e3ceb911dc7 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -409,6 +409,9 @@ setup_lowcore(void) lc->current_task = (unsigned long) init_thread_union.thread_info.task; lc->thread_info = (unsigned long) &init_thread_union; lc->machine_flags = S390_lowcore.machine_flags; + lc->stfl_fac_list = S390_lowcore.stfl_fac_list; + memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, + MAX_FACILITY_BIT/8); #ifndef CONFIG_64BIT if (MACHINE_HAS_IEEE) { lc->extended_save_area_addr = (__u32) @@ -675,12 +678,9 @@ setup_memory(void) static void __init setup_hwcaps(void) { static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; - unsigned long long facility_list_extended; - unsigned int facility_list; struct cpuid cpu_id; int i; - facility_list = stfl(); /* * The store facility list bits numbers as found in the principles * of operation are numbered with bit 1UL<<31 as number 0 to @@ -700,11 +700,10 @@ static void __init setup_hwcaps(void) * HWCAP_S390_ETF3EH bit 8 (22 && 30). */ for (i = 0; i < 6; i++) - if (facility_list & (1UL << (31 - stfl_bits[i]))) + if (test_facility(stfl_bits[i])) elf_hwcap |= 1UL << i; - if ((facility_list & (1UL << (31 - 22))) - && (facility_list & (1UL << (31 - 30)))) + if (test_facility(22) && test_facility(30)) elf_hwcap |= HWCAP_S390_ETF3EH; /* @@ -720,12 +719,8 @@ static void __init setup_hwcaps(void) * translated to: * HWCAP_S390_DFP bit 6 (42 && 44). */ - if ((elf_hwcap & (1UL << 2)) && - __stfle(&facility_list_extended, 1) > 0) { - if ((facility_list_extended & (1ULL << (63 - 42))) - && (facility_list_extended & (1ULL << (63 - 44)))) - elf_hwcap |= HWCAP_S390_DFP; - } + if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) + elf_hwcap |= HWCAP_S390_DFP; /* * Huge page support HWCAP_S390_HPAGE is bit 7. |