mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 16:46:43 +07:00
0b7bb6af1d
There is no need for the __ASSEMBLY__ ifdefery anymore since the architecture level set code that deals with facility bits was converted to C in the meantime. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
|
|
* Copyright IBM Corp. 1999, 2009
|
|
*
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#ifndef __ASM_FACILITY_H
|
|
#define __ASM_FACILITY_H
|
|
|
|
#include <generated/facilities.h>
|
|
#include <linux/string.h>
|
|
#include <linux/preempt.h>
|
|
#include <asm/lowcore.h>
|
|
|
|
#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
|
|
|
|
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)
|
|
{
|
|
unsigned long facilities_als[] = { FACILITIES_ALS };
|
|
|
|
if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
|
|
if (__test_facility(nr, &facilities_als))
|
|
return 1;
|
|
}
|
|
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 */
|