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 16 /* 17 * The test_facility function uses the bit odering where the MSB is bit 0. 18 * That makes it easier to query facility bits with the bit number as 19 * documented in the Principles of Operation. 20 */ 21 static inline int test_facility(unsigned long nr) 22 { 23 unsigned char *ptr; 24 25 if (nr >= MAX_FACILITY_BIT) 26 return 0; 27 ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3); 28 return (*ptr & (0x80 >> (nr & 7))) != 0; 29 } 30 31 /** 32 * stfle - Store facility list extended 33 * @stfle_fac_list: array where facility list can be stored 34 * @size: size of passed in array in double words 35 */ 36 static inline void stfle(u64 *stfle_fac_list, int size) 37 { 38 unsigned long nr; 39 40 preempt_disable(); 41 S390_lowcore.stfl_fac_list = 0; 42 asm volatile( 43 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 44 "0:\n" 45 EX_TABLE(0b, 0b) 46 : "=m" (S390_lowcore.stfl_fac_list)); 47 nr = 4; /* bytes stored by stfl */ 48 memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); 49 if (S390_lowcore.stfl_fac_list & 0x01000000) { 50 /* More facility bits available with stfle */ 51 register unsigned long reg0 asm("0") = size - 1; 52 53 asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ 54 : "+d" (reg0) 55 : "a" (stfle_fac_list) 56 : "memory", "cc"); 57 nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ 58 } 59 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); 60 preempt_enable(); 61 } 62 63 #endif /* __ASM_FACILITY_H */ 64