1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright IBM Corp. 1999, 2009 4 * 5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 6 */ 7 8 #ifndef __ASM_FACILITY_H 9 #define __ASM_FACILITY_H 10 11 #include <asm/facility-defs.h> 12 13 #include <linux/minmax.h> 14 #include <linux/string.h> 15 #include <linux/types.h> 16 #include <linux/preempt.h> 17 18 #include <asm/lowcore.h> 19 20 #define MAX_FACILITY_BIT (sizeof(stfle_fac_list) * 8) 21 22 extern u64 stfle_fac_list[16]; 23 24 static inline void __set_facility(unsigned long nr, void *facilities) 25 { 26 unsigned char *ptr = (unsigned char *) facilities; 27 28 if (nr >= MAX_FACILITY_BIT) 29 return; 30 ptr[nr >> 3] |= 0x80 >> (nr & 7); 31 } 32 33 static inline void __clear_facility(unsigned long nr, void *facilities) 34 { 35 unsigned char *ptr = (unsigned char *) facilities; 36 37 if (nr >= MAX_FACILITY_BIT) 38 return; 39 ptr[nr >> 3] &= ~(0x80 >> (nr & 7)); 40 } 41 42 static inline int __test_facility(unsigned long nr, void *facilities) 43 { 44 unsigned char *ptr; 45 46 if (nr >= MAX_FACILITY_BIT) 47 return 0; 48 ptr = (unsigned char *) facilities + (nr >> 3); 49 return (*ptr & (0x80 >> (nr & 7))) != 0; 50 } 51 52 /* 53 * The test_facility function uses the bit ordering where the MSB is bit 0. 54 * That makes it easier to query facility bits with the bit number as 55 * documented in the Principles of Operation. 56 */ 57 static inline int test_facility(unsigned long nr) 58 { 59 unsigned long facilities_als[] = { FACILITIES_ALS }; 60 61 if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) { 62 if (__test_facility(nr, &facilities_als)) 63 return 1; 64 } 65 return __test_facility(nr, &stfle_fac_list); 66 } 67 68 static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size) 69 { 70 unsigned long reg0 = size - 1; 71 72 asm volatile( 73 " lgr 0,%[reg0]\n" 74 " .insn s,0xb2b00000,%[list]\n" /* stfle */ 75 " lgr %[reg0],0\n" 76 : [reg0] "+&d" (reg0), [list] "+Q" (*stfle_fac_list) 77 : 78 : "memory", "cc", "0"); 79 return reg0; 80 } 81 82 /** 83 * stfle - Store facility list extended 84 * @stfle_fac_list: array where facility list can be stored 85 * @size: size of passed in array in double words 86 */ 87 static inline void __stfle(u64 *stfle_fac_list, int size) 88 { 89 unsigned long nr; 90 u32 stfl_fac_list; 91 92 asm volatile( 93 " stfl 0(0)\n" 94 : "=m" (get_lowcore()->stfl_fac_list)); 95 stfl_fac_list = get_lowcore()->stfl_fac_list; 96 memcpy(stfle_fac_list, &stfl_fac_list, 4); 97 nr = 4; /* bytes stored by stfl */ 98 if (stfl_fac_list & 0x01000000) { 99 /* More facility bits available with stfle */ 100 nr = __stfle_asm(stfle_fac_list, size); 101 nr = min_t(unsigned long, (nr + 1) * 8, size * 8); 102 } 103 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); 104 } 105 106 static inline void stfle(u64 *stfle_fac_list, int size) 107 { 108 preempt_disable(); 109 __stfle(stfle_fac_list, size); 110 preempt_enable(); 111 } 112 113 /** 114 * stfle_size - Actual size of the facility list as specified by stfle 115 * (number of double words) 116 */ 117 unsigned int stfle_size(void); 118 119 #endif /* __ASM_FACILITY_H */ 120