[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)

#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

#ifdef CONFIG_PFAULT
extern void pfault_irq_init(void);
extern int pfault_init(void);
extern void pfault_fini(void);
#else /* CONFIG_PFAULT */
#define pfault_irq_init()	do { } while (0)
#define pfault_init()		({-1;})
#define pfault_fini()		do { } while (0)
#endif /* CONFIG_PFAULT */

#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;								  \
})

extern void __xchg_called_with_bad_pointer(void);

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");
		return old >> shift;
	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");
		return old >> shift;
	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");
		return old;
#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");
		return old;
#endif /* __s390x__ */
	}
	__xchg_called_with_bad_pointer();
	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))))

extern void __cmpxchg_called_with_bad_pointer(void);

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__ */
        }
	__cmpxchg_called_with_bad_pointer();
	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
1da177e4	100	#ifdef CONFIG_VIRT_CPU_ACCOUNTING
1f1c12af MS	101	extern void account_vtime(struct task_struct *);
1f1c12af MS	102	extern void account_tick_vtime(struct task_struct *);
1da177e4	103	extern void account_system_vtime(struct task_struct *);
5c833890 JB	104	#else
5c833890 JB	105	#define account_vtime(x) do { /* empty */ } while (0)
4866cde0	106	#endif
1da177e4	107
29b08d2b HC	108	#ifdef CONFIG_PFAULT
	109	extern void pfault_irq_init(void);
	110	extern int pfault_init(void);
	111	extern void pfault_fini(void);
	112	#else /* CONFIG_PFAULT */
	113	#define pfault_irq_init() do { } while (0)
	114	#define pfault_init() ({-1;})
	115	#define pfault_fini() do { } while (0)
	116	#endif /* CONFIG_PFAULT */
	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	132
210d3a90 HC	133	extern void __xchg_called_with_bad_pointer(void);
210d3a90 HC	134
1da177e4 LT	135	static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
	136	{
	137	unsigned long addr, old;
	138	int shift;
	139
	140	switch (size) {
	141	case 1:
	142	addr = (unsigned long) ptr;
	143	shift = (3 ^ (addr & 3)) << 3;
	144	addr ^= addr & 3;
	145	asm volatile(
94c12cc7 MS	146	" l %0,0(%4)\n"
	147	"0: lr 0,%0\n"
	148	" nr 0,%3\n"
	149	" or 0,%2\n"
	150	" cs %0,0,0(%4)\n"
	151	" jl 0b\n"
1da177e4 LT	152	: "=&d" (old), "=m" ((int ) addr)
1da177e4 LT	153	: "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
94c12cc7	154	"m" ((int ) addr) : "memory", "cc", "0");
210d3a90	155	return old >> shift;
1da177e4 LT	156	case 2:
	157	addr = (unsigned long) ptr;
	158	shift = (2 ^ (addr & 2)) << 3;
	159	addr ^= addr & 2;
	160	asm volatile(
94c12cc7 MS	161	" l %0,0(%4)\n"
	162	"0: lr 0,%0\n"
	163	" nr 0,%3\n"
	164	" or 0,%2\n"
	165	" cs %0,0,0(%4)\n"
	166	" jl 0b\n"
1da177e4 LT	167	: "=&d" (old), "=m" ((int ) addr)
1da177e4 LT	168	: "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
94c12cc7	169	"m" ((int ) addr) : "memory", "cc", "0");
210d3a90	170	return old >> shift;
1da177e4	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");
210d3a90	179	return old;
1da177e4 LT	180	#ifdef __s390x__
1da177e4 LT	181	case 8:
94c12cc7 MS	182	asm volatile(
	183	" lg %0,0(%3)\n"
	184	"0: csg %0,%2,0(%3)\n"
	185	" jl 0b\n"
1da177e4 LT	186	: "=&d" (old), "=m" ((long ) ptr)
1da177e4 LT	187	: "d" (x), "a" (ptr), "m" ((long ) ptr)
94c12cc7	188	: "memory", "cc");
210d3a90	189	return old;
1da177e4	190	#endif /* __s390x__ */
210d3a90 HC	191	}
	192	__xchg_called_with_bad_pointer();
	193	return x;
1da177e4 LT	194	}
	195
	196	/*
	197	* Atomic compare and exchange. Compare OLD with MEM, if identical,
	198	* store NEW in MEM. Return the initial value in MEM. Success is
	199	* indicated by comparing RETURN with OLD.
	200	*/
	201
	202	#define __HAVE_ARCH_CMPXCHG 1
	203
	204	#define cmpxchg(ptr,o,n)\
	205	((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
	206	(unsigned long)(n),sizeof(*(ptr))))
	207
210d3a90 HC	208	extern void __cmpxchg_called_with_bad_pointer(void);
210d3a90 HC	209
1da177e4 LT	210	static inline unsigned long
	211	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
	212	{
	213	unsigned long addr, prev, tmp;
	214	int shift;
	215
	216	switch (size) {
	217	case 1:
	218	addr = (unsigned long) ptr;
	219	shift = (3 ^ (addr & 3)) << 3;
	220	addr ^= addr & 3;
	221	asm volatile(
94c12cc7 MS	222	" l %0,0(%4)\n"
	223	"0: nr %0,%5\n"
	224	" lr %1,%0\n"
	225	" or %0,%2\n"
	226	" or %1,%3\n"
	227	" cs %0,%1,0(%4)\n"
	228	" jnl 1f\n"
	229	" xr %1,%0\n"
	230	" nr %1,%5\n"
	231	" jnz 0b\n"
1da177e4 LT	232	"1:"
	233	: "=&d" (prev), "=&d" (tmp)
	234	: "d" (old << shift), "d" (new << shift), "a" (ptr),
	235	"d" (~(255 << shift))
94c12cc7	236	: "memory", "cc");
1da177e4 LT	237	return prev >> shift;
	238	case 2:
	239	addr = (unsigned long) ptr;
	240	shift = (2 ^ (addr & 2)) << 3;
	241	addr ^= addr & 2;
	242	asm volatile(
94c12cc7 MS	243	" l %0,0(%4)\n"
	244	"0: nr %0,%5\n"
	245	" lr %1,%0\n"
	246	" or %0,%2\n"
	247	" or %1,%3\n"
	248	" cs %0,%1,0(%4)\n"
	249	" jnl 1f\n"
	250	" xr %1,%0\n"
	251	" nr %1,%5\n"
	252	" jnz 0b\n"
1da177e4 LT	253	"1:"
	254	: "=&d" (prev), "=&d" (tmp)
	255	: "d" (old << shift), "d" (new << shift), "a" (ptr),
	256	"d" (~(65535 << shift))
94c12cc7	257	: "memory", "cc");
1da177e4 LT	258	return prev >> shift;
1da177e4 LT	259	case 4:
94c12cc7 MS	260	asm volatile(
94c12cc7 MS	261	" cs %0,%2,0(%3)\n"
1da177e4	262	: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
94c12cc7	263	: "memory", "cc");
1da177e4 LT	264	return prev;
	265	#ifdef __s390x__
	266	case 8:
94c12cc7 MS	267	asm volatile(
94c12cc7 MS	268	" csg %0,%2,0(%3)\n"
1da177e4	269	: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
94c12cc7	270	: "memory", "cc");
1da177e4 LT	271	return prev;
	272	#endif /* __s390x__ */
	273	}
210d3a90 HC	274	__cmpxchg_called_with_bad_pointer();
210d3a90 HC	275	return old;
1da177e4 LT	276	}
	277
	278	/*
	279	* Force strict CPU ordering.
	280	* And yes, this is required on UP too when we're talking
	281	* to devices.
	282	*
	283	* This is very similar to the ppc eieio/sync instruction in that is
	284	* does a checkpoint syncronisation & makes sure that
	285	* all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ).
	286	*/
	287
94c12cc7 MS	288	#define eieio() asm volatile("bcr 15,0" : : : "memory")
94c12cc7 MS	289	#define SYNC_OTHER_CORES(x) eieio()
1da177e4 LT	290	#define mb() eieio()
	291	#define rmb() eieio()
	292	#define wmb() eieio()
	293	#define read_barrier_depends() do { } while(0)
	294	#define smp_mb() mb()
	295	#define smp_rmb() rmb()
	296	#define smp_wmb() wmb()
	297	#define smp_read_barrier_depends() read_barrier_depends()
	298	#define smp_mb__before_clear_bit() smp_mb()
	299	#define smp_mb__after_clear_bit() smp_mb()
	300
	301
	302	#define set_mb(var, value) do { var = value; mb(); } while (0)
1da177e4	303
1da177e4 LT	304	#ifdef __s390x__
1da177e4 LT	305
94c12cc7 MS	306	#define __ctl_load(array, low, high) ({ \
	307	typedef struct { char _[sizeof(array)]; } addrtype; \
	308	asm volatile( \
	309	" lctlg %1,%2,0(%0)\n" \
	310	: : "a" (&array), "i" (low), "i" (high), \
	311	"m" ((addrtype )(array))); \
1da177e4 LT	312	})
1da177e4 LT	313
94c12cc7 MS	314	#define __ctl_store(array, low, high) ({ \
	315	typedef struct { char _[sizeof(array)]; } addrtype; \
	316	asm volatile( \
	317	" stctg %2,%3,0(%1)\n" \
	318	: "=m" ((addrtype )(array)) \
	319	: "a" (&array), "i" (low), "i" (high)); \
1da177e4 LT	320	})
1da177e4 LT	321
1da177e4 LT	322	#else /* __s390x__ */
1da177e4 LT	323
94c12cc7 MS	324	#define __ctl_load(array, low, high) ({ \
	325	typedef struct { char _[sizeof(array)]; } addrtype; \
	326	asm volatile( \
	327	" lctl %1,%2,0(%0)\n" \
	328	: : "a" (&array), "i" (low), "i" (high), \
	329	"m" ((addrtype )(array))); \
	330	})
1da177e4	331
94c12cc7 MS	332	#define __ctl_store(array, low, high) ({ \
	333	typedef struct { char _[sizeof(array)]; } addrtype; \
	334	asm volatile( \
	335	" stctl %2,%3,0(%1)\n" \
	336	: "=m" ((addrtype )(array)) \
	337	: "a" (&array), "i" (low), "i" (high)); \
1da177e4 LT	338	})
1da177e4 LT	339
1da177e4 LT	340	#endif /* __s390x__ */
1da177e4 LT	341
94c12cc7 MS	342	#define __ctl_set_bit(cr, bit) ({ \
	343	unsigned long __dummy; \
	344	__ctl_store(__dummy, cr, cr); \
	345	__dummy \|= 1UL << (bit); \
	346	__ctl_load(__dummy, cr, cr); \
	347	})
	348
	349	#define __ctl_clear_bit(cr, bit) ({ \
	350	unsigned long __dummy; \
	351	__ctl_store(__dummy, cr, cr); \
	352	__dummy &= ~(1UL << (bit)); \
	353	__ctl_load(__dummy, cr, cr); \
	354	})
	355
1f194a4c	356	#include <linux/irqflags.h>
1da177e4	357
77fa2245 HC	358	/*
	359	* Use to set psw mask except for the first byte which
	360	* won't be changed by this function.
	361	*/
	362	static inline void
	363	__set_psw_mask(unsigned long mask)
	364	{
94c12cc7	365	__load_psw_mask(mask \| (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
77fa2245 HC	366	}
77fa2245 HC	367
c1821c2e GS	368	#define local_mcck_enable() __set_psw_mask(psw_kernel_bits)
c1821c2e GS	369	#define local_mcck_disable() __set_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK)
77fa2245	370
1da177e4 LT	371	#ifdef CONFIG_SMP
	372
	373	extern void smp_ctl_set_bit(int cr, int bit);
	374	extern void smp_ctl_clear_bit(int cr, int bit);
	375	#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
	376	#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
	377
	378	#else
	379
	380	#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
	381	#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
	382
	383	#endif /* CONFIG_SMP */
	384
	385	extern void (_machine_restart)(char command);
	386	extern void (*_machine_halt)(void);
	387	extern void (*_machine_power_off)(void);
	388
	389	#define arch_align_stack(x) (x)
	390
	391	#endif /* __KERNEL__ */
	392
	393	#endif