xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] cleanup facility list handling

Browse Source 
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>
This commit is contained in:
Martin Schwidefsky
2010-10-25 16:10:51 +02:00
committed by Martin Schwidefsky
parent eca577ef59
commit 14375bc4eb
12 changed files with 66 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
arch/s390/kernel/early.c
View File

@@ -256,13 +256,35 @@ static noinline __init void setup_lowcore_early(void)
s390_base_pgm_handler_fn = early_pgm_check_handler;
}
static noinline __init void setup_facility_list(void)
{
unsigned long nr;
S390_lowcore.stfl_fac_list = 0;
asm volatile(
" .insn s,0xb2b10000,0(0)\n" /* stfl */
"0:\n"
EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
nr = 4; /* # bytes stored by stfl */
if (test_facility(7)) {
/* More facility bits available with stfle */
register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
asm volatile(".insn s,0xb2b00000,%0" /* stfle */
: "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
: : "cc");
nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
}
memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
MAX_FACILITY_BIT/8 - nr);
}
static noinline __init void setup_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
unsigned int facilities;
facilities = stfl();
if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
if (!test_facility(2) || !test_facility(8))
return;
S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
__ctl_set_bit(0, 23);
@@ -356,18 +378,13 @@ static __init void detect_diag44(void)
static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
unsigned int facilities;
unsigned long long facility_bits;
facilities = stfl();
if (facilities & (1 << 28))
if (test_facility(3))
S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
if (facilities & (1 << 23))
if (test_facility(8))
S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
if (facilities & (1 << 4))
if (test_facility(27))
S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
if ((stfle(&facility_bits, 1) > 0) &&
(facility_bits & (1ULL << (63 - 40))))
if (test_facility(40))
S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
#endif
}
@@ -448,6 +465,7 @@ void __init startup_init(void)
lockdep_off();
sort_main_extable();
setup_lowcore_early();
setup_facility_list();
detect_machine_type();
ipl_update_parameters();
setup_boot_command_line();