/*
* Copyright IBM Corp. 1999, 2009
*
* Author(s): Martin Schwidefsky <[email protected]>
*/

#ifndef __ASM_FACILITY_H
#define __ASM_FACILITY_H

#include <linux/string.h>
#include <linux/preempt.h>
#include <asm/lowcore.h>

#define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */

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)
{
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(
" .insn s,0xb2b10000,0(0)\n" /* stfl */
"0:\n"
EX_TABLE(0b, 0b)
: "+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 */