[deliverable/linux.git] / include / asm-s390 / system.h

/*
 *  include/asm-s390/system.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *
 *  Derived from "include/asm-i386/system.h"
 */

#ifndef __ASM_SYSTEM_H
#define __ASM_SYSTEM_H

#include <linux/kernel.h>
#include <asm/types.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/processor.h>

#ifdef __KERNEL__

struct task_struct;

extern struct task_struct *__switch_to(void *, void *);

static inline void save_fp_regs(s390_fp_regs *fpregs)
{
	asm volatile(
		"	std	0,8(%1)\n"
		"	std	2,24(%1)\n"
		"	std	4,40(%1)\n"
		"	std	6,56(%1)"
		: "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
	if (!MACHINE_HAS_IEEE)
		return;
	asm volatile(
		"	stfpc	0(%1)\n"
		"	std	1,16(%1)\n"
		"	std	3,32(%1)\n"
		"	std	5,48(%1)\n"
		"	std	7,64(%1)\n"
		"	std	8,72(%1)\n"
		"	std	9,80(%1)\n"
		"	std	10,88(%1)\n"
		"	std	11,96(%1)\n"
		"	std	12,104(%1)\n"
		"	std	13,112(%1)\n"
		"	std	14,120(%1)\n"
		"	std	15,128(%1)\n"
		: "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
}

static inline void restore_fp_regs(s390_fp_regs *fpregs)
{
	asm volatile(
		"	ld	0,8(%0)\n"
		"	ld	2,24(%0)\n"
		"	ld	4,40(%0)\n"
		"	ld	6,56(%0)"
		: : "a" (fpregs), "m" (*fpregs));
	if (!MACHINE_HAS_IEEE)
		return;
	asm volatile(
		"	lfpc	0(%0)\n"
		"	ld	1,16(%0)\n"
		"	ld	3,32(%0)\n"
		"	ld	5,48(%0)\n"
		"	ld	7,64(%0)\n"
		"	ld	8,72(%0)\n"
		"	ld	9,80(%0)\n"
		"	ld	10,88(%0)\n"
		"	ld	11,96(%0)\n"
		"	ld	12,104(%0)\n"
		"	ld	13,112(%0)\n"
		"	ld	14,120(%0)\n"
		"	ld	15,128(%0)\n"
		: : "a" (fpregs), "m" (*fpregs));
}

static inline void save_access_regs(unsigned int *acrs)
{
	asm volatile("stam 0,15,0(%0)" : : "a" (acrs) : "memory");
}

static inline void restore_access_regs(unsigned int *acrs)
{
	asm volatile("lam 0,15,0(%0)" : : "a" (acrs));
}

#define switch_to(prev,next,last) do {					     \
	if (prev == next)						     \
		break;							     \
	save_fp_regs(&prev->thread.fp_regs);				     \
	restore_fp_regs(&next->thread.fp_regs);				     \
	save_access_regs(&prev->thread.acrs[0]);			     \
	restore_access_regs(&next->thread.acrs[0]);			     \
	prev = __switch_to(prev,next);					     \
} while (0)

/*
 * On SMP systems, when the scheduler does migration-cost autodetection,
 * it needs a way to flush as much of the CPU's caches as possible.
 *
 * TODO: fill this in!
 */
static inline void sched_cacheflush(void)
{
}

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
extern void account_vtime(struct task_struct *);
extern void account_tick_vtime(struct task_struct *);
extern void account_system_vtime(struct task_struct *);
#else
#define account_vtime(x) do { /* empty */ } while (0)
#endif

#define finish_arch_switch(prev) do {					     \
	set_fs(current->thread.mm_segment);				     \
	account_vtime(prev);						     \
} while (0)

#define nop() asm volatile("nop")

#define xchg(ptr,x)							  \
({									  \
	__typeof__(*(ptr)) __ret;					  \
	__ret = (__typeof__(*(ptr)))					  \
		__xchg((unsigned long)(x), (void *)(ptr),sizeof(*(ptr))); \
	__ret;								  \
})

static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
	unsigned long addr, old;
	int shift;

        switch (size) {
	case 1:
		addr = (unsigned long) ptr;
		shift = (3 ^ (addr & 3)) << 3;
		addr ^= addr & 3;
		asm volatile(
			"	l	%0,0(%4)\n"
			"0:	lr	0,%0\n"
			"	nr	0,%3\n"
			"	or	0,%2\n"
			"	cs	%0,0,0(%4)\n"
			"	jl	0b\n"
			: "=&d" (old), "=m" (*(int *) addr)
			: "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
			  "m" (*(int *) addr) : "memory", "cc", "0");
		x = old >> shift;
		break;
	case 2:
		addr = (unsigned long) ptr;
		shift = (2 ^ (addr & 2)) << 3;
		addr ^= addr & 2;
		asm volatile(
			"	l	%0,0(%4)\n"
			"0:	lr	0,%0\n"
			"	nr	0,%3\n"
			"	or	0,%2\n"
			"	cs	%0,0,0(%4)\n"
			"	jl	0b\n"
			: "=&d" (old), "=m" (*(int *) addr)
			: "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
			  "m" (*(int *) addr) : "memory", "cc", "0");
		x = old >> shift;
		break;
	case 4:
		asm volatile(
			"	l	%0,0(%3)\n"
			"0:	cs	%0,%2,0(%3)\n"
			"	jl	0b\n"
			: "=&d" (old), "=m" (*(int *) ptr)
			: "d" (x), "a" (ptr), "m" (*(int *) ptr)
			: "memory", "cc");
		x = old;
		break;
#ifdef __s390x__
	case 8:
		asm volatile(
			"	lg	%0,0(%3)\n"
			"0:	csg	%0,%2,0(%3)\n"
			"	jl	0b\n"
			: "=&d" (old), "=m" (*(long *) ptr)
			: "d" (x), "a" (ptr), "m" (*(long *) ptr)
			: "memory", "cc");
		x = old;
		break;
#endif /* __s390x__ */
        }
        return x;
}

/*
 * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 * store NEW in MEM.  Return the initial value in MEM.  Success is
 * indicated by comparing RETURN with OLD.
 */

#define __HAVE_ARCH_CMPXCHG 1

#define cmpxchg(ptr,o,n)\
	((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
					(unsigned long)(n),sizeof(*(ptr))))

static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
	unsigned long addr, prev, tmp;
	int shift;

        switch (size) {
	case 1:
		addr = (unsigned long) ptr;
		shift = (3 ^ (addr & 3)) << 3;
		addr ^= addr & 3;
		asm volatile(
			"	l	%0,0(%4)\n"
			"0:	nr	%0,%5\n"
			"	lr	%1,%0\n"
			"	or	%0,%2\n"
			"	or	%1,%3\n"
			"	cs	%0,%1,0(%4)\n"
			"	jnl	1f\n"
			"	xr	%1,%0\n"
			"	nr	%1,%5\n"
			"	jnz	0b\n"
			"1:"
			: "=&d" (prev), "=&d" (tmp)
			: "d" (old << shift), "d" (new << shift), "a" (ptr),
			  "d" (~(255 << shift))
			: "memory", "cc");
		return prev >> shift;
	case 2:
		addr = (unsigned long) ptr;
		shift = (2 ^ (addr & 2)) << 3;
		addr ^= addr & 2;
		asm volatile(
			"	l	%0,0(%4)\n"
			"0:	nr	%0,%5\n"
			"	lr	%1,%0\n"
			"	or	%0,%2\n"
			"	or	%1,%3\n"
			"	cs	%0,%1,0(%4)\n"
			"	jnl	1f\n"
			"	xr	%1,%0\n"
			"	nr	%1,%5\n"
			"	jnz	0b\n"
			"1:"
			: "=&d" (prev), "=&d" (tmp)
			: "d" (old << shift), "d" (new << shift), "a" (ptr),
			  "d" (~(65535 << shift))
			: "memory", "cc");
		return prev >> shift;
	case 4:
		asm volatile(
			"	cs	%0,%2,0(%3)\n"
			: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
			: "memory", "cc");
		return prev;
#ifdef __s390x__
	case 8:
		asm volatile(
			"	csg	%0,%2,0(%3)\n"
			: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
			: "memory", "cc");
		return prev;
#endif /* __s390x__ */
        }
        return old;
}

/*
 * Force strict CPU ordering.
 * And yes, this is required on UP too when we're talking
 * to devices.
 *
 * This is very similar to the ppc eieio/sync instruction in that is
 * does a checkpoint syncronisation & makes sure that 
 * all memory ops have completed wrt other CPU's ( see 7-15 POP  DJB ).
 */

#define eieio()	asm volatile("bcr 15,0" : : : "memory")
#define SYNC_OTHER_CORES(x)   eieio()
#define mb()    eieio()
#define rmb()   eieio()
#define wmb()   eieio()
#define read_barrier_depends() do { } while(0)
#define smp_mb()       mb()
#define smp_rmb()      rmb()
#define smp_wmb()      wmb()
#define smp_read_barrier_depends()    read_barrier_depends()
#define smp_mb__before_clear_bit()     smp_mb()
#define smp_mb__after_clear_bit()      smp_mb()


#define set_mb(var, value)      do { var = value; mb(); } while (0)

#ifdef __s390x__

#define __ctl_load(array, low, high) ({				\
	typedef struct { char _[sizeof(array)]; } addrtype;	\
	asm volatile(						\
		"	lctlg	%1,%2,0(%0)\n"			\
		: : "a" (&array), "i" (low), "i" (high),	\
		    "m" (*(addrtype *)(array)));		\
	})

#define __ctl_store(array, low, high) ({			\
	typedef struct { char _[sizeof(array)]; } addrtype;	\
	asm volatile(						\
		"	stctg	%2,%3,0(%1)\n"			\
		: "=m" (*(addrtype *)(array))			\
		: "a" (&array), "i" (low), "i" (high));		\
	})

#else /* __s390x__ */

#define __ctl_load(array, low, high) ({				\
	typedef struct { char _[sizeof(array)]; } addrtype;	\
	asm volatile(						\
		"	lctl	%1,%2,0(%0)\n"			\
		: : "a" (&array), "i" (low), "i" (high),	\
		    "m" (*(addrtype *)(array)));		\
})

#define __ctl_store(array, low, high) ({			\
	typedef struct { char _[sizeof(array)]; } addrtype;	\
	asm volatile(						\
		"	stctl	%2,%3,0(%1)\n"			\
		: "=m" (*(addrtype *)(array))			\
		: "a" (&array), "i" (low), "i" (high));		\
	})

#endif /* __s390x__ */

#define __ctl_set_bit(cr, bit) ({	\
	unsigned long __dummy;		\
	__ctl_store(__dummy, cr, cr);	\
	__dummy |= 1UL << (bit);	\
	__ctl_load(__dummy, cr, cr);	\
})

#define __ctl_clear_bit(cr, bit) ({	\
	unsigned long __dummy;		\
	__ctl_store(__dummy, cr, cr);	\
	__dummy &= ~(1UL << (bit));	\
	__ctl_load(__dummy, cr, cr);	\
})

#include <linux/irqflags.h>

/*
 * Use to set psw mask except for the first byte which
 * won't be changed by this function.
 */
static inline void
__set_psw_mask(unsigned long mask)
{
	__load_psw_mask(mask | (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
}

#define local_mcck_enable()  __set_psw_mask(PSW_KERNEL_BITS)
#define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)

#ifdef CONFIG_SMP

extern void smp_ctl_set_bit(int cr, int bit);
extern void smp_ctl_clear_bit(int cr, int bit);
#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)

#else

#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)

#endif /* CONFIG_SMP */

extern void (*_machine_restart)(char *command);
extern void (*_machine_halt)(void);
extern void (*_machine_power_off)(void);

#define arch_align_stack(x) (x)

#endif /* __KERNEL__ */

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-s390/system.h
	3	*
	4	* S390 version
	5	* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	7	*
	8	* Derived from "include/asm-i386/system.h"
	9	*/
	10
	11	#ifndef __ASM_SYSTEM_H
	12	#define __ASM_SYSTEM_H
	13
1da177e4 LT	14	#include <linux/kernel.h>
	15	#include <asm/types.h>
	16	#include <asm/ptrace.h>
	17	#include <asm/setup.h>
77fa2245	18	#include <asm/processor.h>
1da177e4 LT	19
	20	#ifdef __KERNEL__
	21
	22	struct task_struct;
	23
	24	extern struct task_struct __switch_to(void , void *);
	25
1da177e4 LT	26	static inline void save_fp_regs(s390_fp_regs *fpregs)
1da177e4 LT	27	{
94c12cc7 MS	28	asm volatile(
	29	" std 0,8(%1)\n"
	30	" std 2,24(%1)\n"
	31	" std 4,40(%1)\n"
	32	" std 6,56(%1)"
	33	: "=m" (fpregs) : "a" (fpregs), "m" (fpregs) : "memory");
1da177e4 LT	34	if (!MACHINE_HAS_IEEE)
	35	return;
	36	asm volatile(
94c12cc7 MS	37	" stfpc 0(%1)\n"
	38	" std 1,16(%1)\n"
	39	" std 3,32(%1)\n"
	40	" std 5,48(%1)\n"
	41	" std 7,64(%1)\n"
	42	" std 8,72(%1)\n"
	43	" std 9,80(%1)\n"
	44	" std 10,88(%1)\n"
	45	" std 11,96(%1)\n"
	46	" std 12,104(%1)\n"
	47	" std 13,112(%1)\n"
	48	" std 14,120(%1)\n"
	49	" std 15,128(%1)\n"
	50	: "=m" (fpregs) : "a" (fpregs), "m" (fpregs) : "memory");
1da177e4 LT	51	}
	52
	53	static inline void restore_fp_regs(s390_fp_regs *fpregs)
	54	{
94c12cc7 MS	55	asm volatile(
	56	" ld 0,8(%0)\n"
	57	" ld 2,24(%0)\n"
	58	" ld 4,40(%0)\n"
	59	" ld 6,56(%0)"
	60	: : "a" (fpregs), "m" (*fpregs));
1da177e4 LT	61	if (!MACHINE_HAS_IEEE)
	62	return;
	63	asm volatile(
94c12cc7 MS	64	" lfpc 0(%0)\n"
	65	" ld 1,16(%0)\n"
	66	" ld 3,32(%0)\n"
	67	" ld 5,48(%0)\n"
	68	" ld 7,64(%0)\n"
	69	" ld 8,72(%0)\n"
	70	" ld 9,80(%0)\n"
	71	" ld 10,88(%0)\n"
	72	" ld 11,96(%0)\n"
	73	" ld 12,104(%0)\n"
	74	" ld 13,112(%0)\n"
	75	" ld 14,120(%0)\n"
	76	" ld 15,128(%0)\n"
	77	: : "a" (fpregs), "m" (*fpregs));
1da177e4 LT	78	}
	79
	80	static inline void save_access_regs(unsigned int *acrs)
	81	{
94c12cc7	82	asm volatile("stam 0,15,0(%0)" : : "a" (acrs) : "memory");
1da177e4 LT	83	}
	84
	85	static inline void restore_access_regs(unsigned int *acrs)
	86	{
94c12cc7	87	asm volatile("lam 0,15,0(%0)" : : "a" (acrs));
1da177e4 LT	88	}
	89
	90	#define switch_to(prev,next,last) do { \
	91	if (prev == next) \
	92	break; \
	93	save_fp_regs(&prev->thread.fp_regs); \
	94	restore_fp_regs(&next->thread.fp_regs); \
	95	save_access_regs(&prev->thread.acrs[0]); \
	96	restore_access_regs(&next->thread.acrs[0]); \
	97	prev = __switch_to(prev,next); \
	98	} while (0)
	99
4dc7a0bb IM	100	/*
	101	* On SMP systems, when the scheduler does migration-cost autodetection,
	102	* it needs a way to flush as much of the CPU's caches as possible.
	103	*
	104	* TODO: fill this in!
	105	*/
	106	static inline void sched_cacheflush(void)
	107	{
	108	}
	109
1da177e4	110	#ifdef CONFIG_VIRT_CPU_ACCOUNTING
1f1c12af MS	111	extern void account_vtime(struct task_struct *);
1f1c12af MS	112	extern void account_tick_vtime(struct task_struct *);
1da177e4	113	extern void account_system_vtime(struct task_struct *);
5c833890 JB	114	#else
5c833890 JB	115	#define account_vtime(x) do { /* empty */ } while (0)
4866cde0	116	#endif
1da177e4	117
5ee24d95	118	#define finish_arch_switch(prev) do { \
1da177e4	119	set_fs(current->thread.mm_segment); \
1f1c12af	120	account_vtime(prev); \
1da177e4 LT	121	} while (0)
1da177e4 LT	122
94c12cc7	123	#define nop() asm volatile("nop")
1da177e4	124
5a651c93 HC	125	#define xchg(ptr,x) \
	126	({ \
	127	__typeof__(*(ptr)) __ret; \
	128	__ret = (__typeof__(*(ptr))) \
	129	__xchg((unsigned long)(x), (void )(ptr),sizeof((ptr))); \
	130	__ret; \
	131	})
1da177e4 LT	132
	133	static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
	134	{
	135	unsigned long addr, old;
	136	int shift;
	137
	138	switch (size) {
	139	case 1:
	140	addr = (unsigned long) ptr;
	141	shift = (3 ^ (addr & 3)) << 3;
	142	addr ^= addr & 3;
	143	asm volatile(
94c12cc7 MS	144	" l %0,0(%4)\n"
	145	"0: lr 0,%0\n"
	146	" nr 0,%3\n"
	147	" or 0,%2\n"
	148	" cs %0,0,0(%4)\n"
	149	" jl 0b\n"
1da177e4 LT	150	: "=&d" (old), "=m" ((int ) addr)
1da177e4 LT	151	: "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
94c12cc7	152	"m" ((int ) addr) : "memory", "cc", "0");
1da177e4 LT	153	x = old >> shift;
	154	break;
	155	case 2:
	156	addr = (unsigned long) ptr;
	157	shift = (2 ^ (addr & 2)) << 3;
	158	addr ^= addr & 2;
	159	asm volatile(
94c12cc7 MS	160	" l %0,0(%4)\n"
	161	"0: lr 0,%0\n"
	162	" nr 0,%3\n"
	163	" or 0,%2\n"
	164	" cs %0,0,0(%4)\n"
	165	" jl 0b\n"
1da177e4 LT	166	: "=&d" (old), "=m" ((int ) addr)
1da177e4 LT	167	: "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
94c12cc7	168	"m" ((int ) addr) : "memory", "cc", "0");
1da177e4 LT	169	x = old >> shift;
	170	break;
	171	case 4:
94c12cc7 MS	172	asm volatile(
	173	" l %0,0(%3)\n"
	174	"0: cs %0,%2,0(%3)\n"
	175	" jl 0b\n"
1da177e4 LT	176	: "=&d" (old), "=m" ((int ) ptr)
1da177e4 LT	177	: "d" (x), "a" (ptr), "m" ((int ) ptr)
94c12cc7	178	: "memory", "cc");
1da177e4 LT	179	x = old;
	180	break;
	181	#ifdef __s390x__
	182	case 8:
94c12cc7 MS	183	asm volatile(
	184	" lg %0,0(%3)\n"
	185	"0: csg %0,%2,0(%3)\n"
	186	" jl 0b\n"
1da177e4 LT	187	: "=&d" (old), "=m" ((long ) ptr)
1da177e4 LT	188	: "d" (x), "a" (ptr), "m" ((long ) ptr)
94c12cc7	189	: "memory", "cc");
1da177e4 LT	190	x = old;
	191	break;
	192	#endif /* __s390x__ */
	193	}
	194	return x;
	195	}
	196
	197	/*
	198	* Atomic compare and exchange. Compare OLD with MEM, if identical,
	199	* store NEW in MEM. Return the initial value in MEM. Success is
	200	* indicated by comparing RETURN with OLD.
	201	*/
	202
	203	#define __HAVE_ARCH_CMPXCHG 1
	204
	205	#define cmpxchg(ptr,o,n)\
	206	((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
	207	(unsigned long)(n),sizeof(*(ptr))))
	208
	209	static inline unsigned long
	210	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
	211	{
	212	unsigned long addr, prev, tmp;
	213	int shift;
	214
	215	switch (size) {
	216	case 1:
	217	addr = (unsigned long) ptr;
	218	shift = (3 ^ (addr & 3)) << 3;
	219	addr ^= addr & 3;
	220	asm volatile(
94c12cc7 MS	221	" l %0,0(%4)\n"
	222	"0: nr %0,%5\n"
	223	" lr %1,%0\n"
	224	" or %0,%2\n"
	225	" or %1,%3\n"
	226	" cs %0,%1,0(%4)\n"
	227	" jnl 1f\n"
	228	" xr %1,%0\n"
	229	" nr %1,%5\n"
	230	" jnz 0b\n"
1da177e4 LT	231	"1:"
	232	: "=&d" (prev), "=&d" (tmp)
	233	: "d" (old << shift), "d" (new << shift), "a" (ptr),
	234	"d" (~(255 << shift))
94c12cc7	235	: "memory", "cc");
1da177e4 LT	236	return prev >> shift;
	237	case 2:
	238	addr = (unsigned long) ptr;
	239	shift = (2 ^ (addr & 2)) << 3;
	240	addr ^= addr & 2;
	241	asm volatile(
94c12cc7 MS	242	" l %0,0(%4)\n"
	243	"0: nr %0,%5\n"
	244	" lr %1,%0\n"
	245	" or %0,%2\n"
	246	" or %1,%3\n"
	247	" cs %0,%1,0(%4)\n"
	248	" jnl 1f\n"
	249	" xr %1,%0\n"
	250	" nr %1,%5\n"
	251	" jnz 0b\n"
1da177e4 LT	252	"1:"
	253	: "=&d" (prev), "=&d" (tmp)
	254	: "d" (old << shift), "d" (new << shift), "a" (ptr),
	255	"d" (~(65535 << shift))
94c12cc7	256	: "memory", "cc");
1da177e4 LT	257	return prev >> shift;
1da177e4 LT	258	case 4:
94c12cc7 MS	259	asm volatile(
94c12cc7 MS	260	" cs %0,%2,0(%3)\n"
1da177e4	261	: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
94c12cc7	262	: "memory", "cc");
1da177e4 LT	263	return prev;
	264	#ifdef __s390x__
	265	case 8:
94c12cc7 MS	266	asm volatile(
94c12cc7 MS	267	" csg %0,%2,0(%3)\n"
1da177e4	268	: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
94c12cc7	269	: "memory", "cc");
1da177e4 LT	270	return prev;
	271	#endif /* __s390x__ */
	272	}
	273	return old;
	274	}
	275
	276	/*
	277	* Force strict CPU ordering.
	278	* And yes, this is required on UP too when we're talking
	279	* to devices.
	280	*
	281	* This is very similar to the ppc eieio/sync instruction in that is
	282	* does a checkpoint syncronisation & makes sure that
	283	* all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ).
	284	*/
	285
94c12cc7 MS	286	#define eieio() asm volatile("bcr 15,0" : : : "memory")
94c12cc7 MS	287	#define SYNC_OTHER_CORES(x) eieio()
1da177e4 LT	288	#define mb() eieio()
	289	#define rmb() eieio()
	290	#define wmb() eieio()
	291	#define read_barrier_depends() do { } while(0)
	292	#define smp_mb() mb()
	293	#define smp_rmb() rmb()
	294	#define smp_wmb() wmb()
	295	#define smp_read_barrier_depends() read_barrier_depends()
	296	#define smp_mb__before_clear_bit() smp_mb()
	297	#define smp_mb__after_clear_bit() smp_mb()
	298
	299
	300	#define set_mb(var, value) do { var = value; mb(); } while (0)
1da177e4	301
1da177e4 LT	302	#ifdef __s390x__
1da177e4 LT	303
94c12cc7 MS	304	#define __ctl_load(array, low, high) ({ \
	305	typedef struct { char _[sizeof(array)]; } addrtype; \
	306	asm volatile( \
	307	" lctlg %1,%2,0(%0)\n" \
	308	: : "a" (&array), "i" (low), "i" (high), \
	309	"m" ((addrtype )(array))); \
1da177e4 LT	310	})
1da177e4 LT	311
94c12cc7 MS	312	#define __ctl_store(array, low, high) ({ \
	313	typedef struct { char _[sizeof(array)]; } addrtype; \
	314	asm volatile( \
	315	" stctg %2,%3,0(%1)\n" \
	316	: "=m" ((addrtype )(array)) \
	317	: "a" (&array), "i" (low), "i" (high)); \
1da177e4 LT	318	})
1da177e4 LT	319
1da177e4 LT	320	#else /* __s390x__ */
1da177e4 LT	321
94c12cc7 MS	322	#define __ctl_load(array, low, high) ({ \
	323	typedef struct { char _[sizeof(array)]; } addrtype; \
	324	asm volatile( \
	325	" lctl %1,%2,0(%0)\n" \
	326	: : "a" (&array), "i" (low), "i" (high), \
	327	"m" ((addrtype )(array))); \
	328	})
1da177e4	329
94c12cc7 MS	330	#define __ctl_store(array, low, high) ({ \
	331	typedef struct { char _[sizeof(array)]; } addrtype; \
	332	asm volatile( \
	333	" stctl %2,%3,0(%1)\n" \
	334	: "=m" ((addrtype )(array)) \
	335	: "a" (&array), "i" (low), "i" (high)); \
1da177e4 LT	336	})
1da177e4 LT	337
1da177e4 LT	338	#endif /* __s390x__ */
1da177e4 LT	339
94c12cc7 MS	340	#define __ctl_set_bit(cr, bit) ({ \
	341	unsigned long __dummy; \
	342	__ctl_store(__dummy, cr, cr); \
	343	__dummy \|= 1UL << (bit); \
	344	__ctl_load(__dummy, cr, cr); \
	345	})
	346
	347	#define __ctl_clear_bit(cr, bit) ({ \
	348	unsigned long __dummy; \
	349	__ctl_store(__dummy, cr, cr); \
	350	__dummy &= ~(1UL << (bit)); \
	351	__ctl_load(__dummy, cr, cr); \
	352	})
	353
1f194a4c	354	#include <linux/irqflags.h>
1da177e4	355
77fa2245 HC	356	/*
	357	* Use to set psw mask except for the first byte which
	358	* won't be changed by this function.
	359	*/
	360	static inline void
	361	__set_psw_mask(unsigned long mask)
	362	{
94c12cc7	363	__load_psw_mask(mask \| (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
77fa2245 HC	364	}
	365
	366	#define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS)
	367	#define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)
	368
1da177e4 LT	369	#ifdef CONFIG_SMP
	370
	371	extern void smp_ctl_set_bit(int cr, int bit);
	372	extern void smp_ctl_clear_bit(int cr, int bit);
	373	#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
	374	#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
	375
	376	#else
	377
	378	#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
	379	#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
	380
	381	#endif /* CONFIG_SMP */
	382
	383	extern void (_machine_restart)(char command);
	384	extern void (*_machine_halt)(void);
	385	extern void (*_machine_power_off)(void);
	386
	387	#define arch_align_stack(x) (x)
	388
	389	#endif /* __KERNEL__ */
	390
	391	#endif