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cf14899846
To be able to switch off specific CPU alternatives with kernel parameters make a copy of the facility bit mask provided by STFLE and use the copy for the decision to apply an alternative. Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 1999, 2009
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __ASM_FACILITY_H
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#define __ASM_FACILITY_H
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#include <asm/facility-defs.h>
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#include <linux/string.h>
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#include <linux/preempt.h>
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#include <asm/lowcore.h>
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#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
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static inline void __set_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr = (unsigned char *) facilities;
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if (nr >= MAX_FACILITY_BIT)
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return;
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ptr[nr >> 3] |= 0x80 >> (nr & 7);
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}
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static inline void __clear_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr = (unsigned char *) facilities;
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if (nr >= MAX_FACILITY_BIT)
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return;
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ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
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}
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static inline int __test_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr;
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if (nr >= MAX_FACILITY_BIT)
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return 0;
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ptr = (unsigned char *) facilities + (nr >> 3);
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return (*ptr & (0x80 >> (nr & 7))) != 0;
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}
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/*
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* The test_facility function uses the bit odering where the MSB is bit 0.
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* That makes it easier to query facility bits with the bit number as
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* documented in the Principles of Operation.
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*/
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static inline int test_facility(unsigned long nr)
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{
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unsigned long facilities_als[] = { FACILITIES_ALS };
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if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
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if (__test_facility(nr, &facilities_als))
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return 1;
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}
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return __test_facility(nr, &S390_lowcore.stfle_fac_list);
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}
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/**
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* stfle - Store facility list extended
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* @stfle_fac_list: array where facility list can be stored
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* @size: size of passed in array in double words
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*/
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static inline void stfle(u64 *stfle_fac_list, int size)
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{
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unsigned long nr;
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preempt_disable();
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asm volatile(
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" stfl 0(0)\n"
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: "=m" (S390_lowcore.stfl_fac_list));
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nr = 4; /* bytes stored by stfl */
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memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
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if (S390_lowcore.stfl_fac_list & 0x01000000) {
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/* More facility bits available with stfle */
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register unsigned long reg0 asm("0") = size - 1;
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asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
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: "+d" (reg0)
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: "a" (stfle_fac_list)
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: "memory", "cc");
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nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
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}
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memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
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preempt_enable();
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}
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#endif /* __ASM_FACILITY_H */
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