projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a0616cde DH |
1 | /* |
| 2 | * Copyright IBM Corp. 1999, 2009 | |
| 3 | * | |
| 4 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef __ASM_FACILITY_H | |
| 8 | #define __ASM_FACILITY_H | |
| 9 | ||
| 10 | #include <linux/string.h> | |
| 11 | #include <linux/preempt.h> | |
| 12 | #include <asm/lowcore.h> | |
| 13 | ||
| 14 | #define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */ | |
| 15 | ||
| 32089246 MM |
16 | static inline int __test_facility(unsigned long nr, void *facilities) |
| 17 | { | |
| 18 | unsigned char *ptr; | |
| 19 | ||
| 20 | if (nr >= MAX_FACILITY_BIT) | |
| 21 | return 0; | |
| 22 | ptr = (unsigned char *) facilities + (nr >> 3); | |
| 23 | return (*ptr & (0x80 >> (nr & 7))) != 0; | |
| 24 | } | |
| 25 | ||
| a0616cde DH |
26 | /* |
| 27 | * The test_facility function uses the bit odering where the MSB is bit 0. | |
| 28 | * That makes it easier to query facility bits with the bit number as | |
| 29 | * documented in the Principles of Operation. | |
| 30 | */ | |
| 31 | static inline int test_facility(unsigned long nr) | |
| 32 | { | |
| 32089246 | 33 | return __test_facility(nr, &S390_lowcore.stfle_fac_list); |
| a0616cde DH |
34 | } |
| 35 | ||
| 36 | /** | |
| 37 | * stfle - Store facility list extended | |
| 38 | * @stfle_fac_list: array where facility list can be stored | |
| 39 | * @size: size of passed in array in double words | |
| 40 | */ | |
| 41 | static inline void stfle(u64 *stfle_fac_list, int size) | |
| 42 | { | |
| 43 | unsigned long nr; | |
| 44 | ||
| 45 | preempt_disable(); | |
| a0616cde DH |
46 | asm volatile( |
| 47 | " .insn s,0xb2b10000,0(0)\n" /* stfl */ | |
| 48 | "0:\n" | |
| 49 | EX_TABLE(0b, 0b) | |
| 37e37c20 | 50 | : "+m" (S390_lowcore.stfl_fac_list)); |
| a0616cde DH |
51 | nr = 4; /* bytes stored by stfl */ |
| 52 | memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); | |
| 53 | if (S390_lowcore.stfl_fac_list & 0x01000000) { | |
| 54 | /* More facility bits available with stfle */ | |
| 55 | register unsigned long reg0 asm("0") = size - 1; | |
| 56 | ||
| 57 | asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ | |
| 58 | : "+d" (reg0) | |
| 59 | : "a" (stfle_fac_list) | |
| 60 | : "memory", "cc"); | |
| 61 | nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ | |
| 62 | } | |
| 63 | memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); | |
| 64 | preempt_enable(); | |
| 65 | } | |
| 66 | ||
| 67 | #endif /* __ASM_FACILITY_H */ |