| /* |
| * Copyright IBM Corp. 1999, 2009 |
| * |
| * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
| */ |
| |
| #ifndef __ASM_FACILITY_H |
| #define __ASM_FACILITY_H |
| |
| #include <linux/string.h> |
| #include <linux/preempt.h> |
| #include <asm/lowcore.h> |
| |
| #define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */ |
| |
| static inline int __test_facility(unsigned long nr, void *facilities) |
| { |
| unsigned char *ptr; |
| |
| if (nr >= MAX_FACILITY_BIT) |
| return 0; |
| ptr = (unsigned char *) facilities + (nr >> 3); |
| return (*ptr & (0x80 >> (nr & 7))) != 0; |
| } |
| |
| /* |
| * 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) |
| { |
| return __test_facility(nr, &S390_lowcore.stfle_fac_list); |
| } |
| |
| /** |
| * stfle - Store facility list extended |
| * @stfle_fac_list: array where facility list can be stored |
| * @size: size of passed in array in double words |
| */ |
| static inline void stfle(u64 *stfle_fac_list, int size) |
| { |
| unsigned long nr; |
| |
| preempt_disable(); |
| asm volatile( |
| " stfl 0(0)\n" |
| : "=m" (S390_lowcore.stfl_fac_list)); |
| nr = 4; /* bytes stored by stfl */ |
| memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); |
| if (S390_lowcore.stfl_fac_list & 0x01000000) { |
| /* More facility bits available with stfle */ |
| register unsigned long reg0 asm("0") = size - 1; |
| |
| asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ |
| : "+d" (reg0) |
| : "a" (stfle_fac_list) |
| : "memory", "cc"); |
| nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ |
| } |
| memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); |
| preempt_enable(); |
| } |
| |
| #endif /* __ASM_FACILITY_H */ |