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[S390] cleanup facility list handling

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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
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33
arch/s390/include/asm/system.h
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@@ -420,30 +420,21 @@ extern void smp_ctl_clear_bit(int cr, int bit);
#endif /* CONFIG_SMP */
static inline unsigned int stfl(void)
{
asm volatile(
" .insn s,0xb2b10000,0(0)\n" /* stfl */
"0:\n"
EX_TABLE(0b,0b));
return S390_lowcore.stfl_fac_list;
}
#define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
static inline int __stfle(unsigned long long *list, int doublewords)
/*
* The test_facility function uses the bit odering where the MSB is bit 0.
* That makes it easier to query facility bits with the bit number as
* documented in the Principles of Operation.
*/
static inline int test_facility(unsigned long nr)
{
typedef struct { unsigned long long _[doublewords]; } addrtype;
register unsigned long __nr asm("0") = doublewords - 1;
unsigned char *ptr;
asm volatile(".insn s,0xb2b00000,%0" /* stfle */
: "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
return __nr + 1;
}
static inline int stfle(unsigned long long *list, int doublewords)
{
if (!(stfl() & (1UL << 24)))
return -EOPNOTSUPP;
return __stfle(list, doublewords);
if (nr >= MAX_FACILITY_BIT)
return 0;
ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3);
return (*ptr & (0x80 >> (nr & 7))) != 0;
}
static inline unsigned short stap(void)