[mirror_ubuntu-zesty-kernel.git] / arch / s390 / include / asm / processor.h

/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/processor.h"
 *    Copyright (C) 1994, Linus Torvalds
 */

#ifndef __ASM_S390_PROCESSOR_H
#define __ASM_S390_PROCESSOR_H

#include <linux/const.h>

#define CIF_MCCK_PENDING	0	/* machine check handling is pending */
#define CIF_ASCE		1	/* user asce needs fixup / uaccess */
#define CIF_NOHZ_DELAY		2	/* delay HZ disable for a tick */
#define CIF_FPU			3	/* restore FPU registers */
#define CIF_IGNORE_IRQ		4	/* ignore interrupt (for udelay) */
#define CIF_ENABLED_WAIT	5	/* in enabled wait state */

#define _CIF_MCCK_PENDING	_BITUL(CIF_MCCK_PENDING)
#define _CIF_ASCE		_BITUL(CIF_ASCE)
#define _CIF_NOHZ_DELAY		_BITUL(CIF_NOHZ_DELAY)
#define _CIF_FPU		_BITUL(CIF_FPU)
#define _CIF_IGNORE_IRQ		_BITUL(CIF_IGNORE_IRQ)
#define _CIF_ENABLED_WAIT	_BITUL(CIF_ENABLED_WAIT)

#ifndef __ASSEMBLY__

#include <linux/linkage.h>
#include <linux/irqflags.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/runtime_instr.h>
#include <asm/fpu/types.h>
#include <asm/fpu/internal.h>

static inline void set_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags |= (1UL << flag);
}

static inline void clear_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags &= ~(1UL << flag);
}

static inline int test_cpu_flag(int flag)
{
	return !!(S390_lowcore.cpu_flags & (1UL << flag));
}

/*
 * Test CIF flag of another CPU. The caller needs to ensure that
 * CPU hotplug can not happen, e.g. by disabling preemption.
 */
static inline int test_cpu_flag_of(int flag, int cpu)
{
	struct lowcore *lc = lowcore_ptr[cpu];
	return !!(lc->cpu_flags & (1UL << flag));
}

#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })

static inline void get_cpu_id(struct cpuid *ptr)
{
	asm volatile("stidp %0" : "=Q" (*ptr));
}

void s390_adjust_jiffies(void);
void s390_update_cpu_mhz(void);
void cpu_detect_mhz_feature(void);

extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;
extern void execve_tail(void);

/*
 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
 */

#define TASK_SIZE_OF(tsk)	((tsk)->mm ? \
				 (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
#define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_31BIT) ? \
					(1UL << 30) : (1UL << 41))
#define TASK_SIZE		TASK_SIZE_OF(current)
#define TASK_MAX_SIZE		(1UL << 53)

#define STACK_TOP		(1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
#define STACK_TOP_MAX		(1UL << 42)

#define HAVE_ARCH_PICK_MMAP_LAYOUT

typedef struct {
        __u32 ar4;
} mm_segment_t;

/*
 * Thread structure
 */
struct thread_struct {
	unsigned int  acrs[NUM_ACRS];
        unsigned long ksp;              /* kernel stack pointer             */
	unsigned long user_timer;	/* task cputime in user space */
	unsigned long system_timer;	/* task cputime in kernel space */
	unsigned long sys_call_table;	/* system call table address */
	mm_segment_t mm_segment;
	unsigned long gmap_addr;	/* address of last gmap fault. */
	unsigned int gmap_write_flag;	/* gmap fault write indication */
	unsigned int gmap_int_code;	/* int code of last gmap fault */
	unsigned int gmap_pfault;	/* signal of a pending guest pfault */
	/* Per-thread information related to debugging */
	struct per_regs per_user;	/* User specified PER registers */
	struct per_event per_event;	/* Cause of the last PER trap */
	unsigned long per_flags;	/* Flags to control debug behavior */
	unsigned int system_call;	/* system call number in signal */
	unsigned long last_break;	/* last breaking-event-address. */
        /* pfault_wait is used to block the process on a pfault event */
	unsigned long pfault_wait;
	struct list_head list;
	/* cpu runtime instrumentation */
	struct runtime_instr_cb *ri_cb;
	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
	/*
	 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
	 * the end.
	 */
	struct fpu fpu;			/* FP and VX register save area */
};

/* Flag to disable transactions. */
#define PER_FLAG_NO_TE			1UL
/* Flag to enable random transaction aborts. */
#define PER_FLAG_TE_ABORT_RAND		2UL
/* Flag to specify random transaction abort mode:
 * - abort each transaction at a random instruction before TEND if set.
 * - abort random transactions at a random instruction if cleared.
 */
#define PER_FLAG_TE_ABORT_RAND_TEND	4UL

typedef struct thread_struct thread_struct;

/*
 * Stack layout of a C stack frame.
 */
#ifndef __PACK_STACK
struct stack_frame {
	unsigned long back_chain;
	unsigned long empty1[5];
	unsigned long gprs[10];
	unsigned int  empty2[8];
};
#else
struct stack_frame {
	unsigned long empty1[5];
	unsigned int  empty2[8];
	unsigned long gprs[10];
	unsigned long back_chain;
};
#endif

#define ARCH_MIN_TASKALIGN	8

#define INIT_THREAD {							\
	.ksp = sizeof(init_stack) + (unsigned long) &init_stack,	\
	.fpu.regs = (void *) init_task.thread.fpu.fprs,			\
}

/*
 * Do necessary setup to start up a new thread.
 */
#define start_thread(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;	\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	execve_tail();							\
} while (0)

#define start_thread31(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_BA;			\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	crst_table_downgrade(current->mm);				\
	execve_tail();							\
} while (0)

/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
struct seq_file;

typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
void dump_trace(dump_trace_func_t func, void *data,
		struct task_struct *task, unsigned long sp);

void show_cacheinfo(struct seq_file *m);

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

/*
 * Return saved PC of a blocked thread.
 */
extern unsigned long thread_saved_pc(struct task_struct *t);

unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \
        (task_stack_page(tsk) + THREAD_SIZE) - 1)
#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)
#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15])

/* Has task runtime instrumentation enabled ? */
#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)

static inline unsigned long current_stack_pointer(void)
{
	unsigned long sp;

	asm volatile("la %0,0(15)" : "=a" (sp));
	return sp;
}

static inline unsigned short stap(void)
{
	unsigned short cpu_address;

	asm volatile("stap %0" : "=m" (cpu_address));
	return cpu_address;
}

/*
 * Give up the time slice of the virtual PU.
 */
#define cpu_relax_yield cpu_relax_yield
void cpu_relax_yield(void);

#define cpu_relax() barrier()

#define ECAG_CACHE_ATTRIBUTE	0
#define ECAG_CPU_ATTRIBUTE	1

static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
{
	unsigned long val;

	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
		     : "=d" (val) : "a" (asi << 8 | parm));
	return val;
}

static inline void psw_set_key(unsigned int key)
{
	asm volatile("spka 0(%0)" : : "d" (key));
}

/*
 * Set PSW to specified value.
 */
static inline void __load_psw(psw_t psw)
{
	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
}

/*
 * Set PSW mask to specified value, while leaving the
 * PSW addr pointing to the next instruction.
 */
static inline void __load_psw_mask(unsigned long mask)
{
	unsigned long addr;
	psw_t psw;

	psw.mask = mask;

	asm volatile(
		"	larl	%0,1f\n"
		"	stg	%0,%O1+8(%R1)\n"
		"	lpswe	%1\n"
		"1:"
		: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
}

/*
 * Extract current PSW mask
 */
static inline unsigned long __extract_psw(void)
{
	unsigned int reg1, reg2;

	asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
	return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
}

static inline void local_mcck_enable(void)
{
	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
}

static inline void local_mcck_disable(void)
{
	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
}

/*
 * Rewind PSW instruction address by specified number of bytes.
 */
static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
{
	unsigned long mask;

	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
	       (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
					  (1UL << 24) - 1;
	return (psw.addr - ilc) & mask;
}

/*
 * Function to stop a processor until the next interrupt occurs
 */
void enabled_wait(void);

/*
 * Function to drop a processor into disabled wait state
 */
static inline void __noreturn disabled_wait(unsigned long code)
{
	psw_t psw;

	psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
	psw.addr = code;
	__load_psw(psw);
	while (1);
}

/*
 * Basic Machine Check/Program Check Handler.
 */

extern void s390_base_mcck_handler(void);
extern void s390_base_pgm_handler(void);
extern void s390_base_ext_handler(void);

extern void (*s390_base_mcck_handler_fn)(void);
extern void (*s390_base_pgm_handler_fn)(void);
extern void (*s390_base_ext_handler_fn)(void);

#define ARCH_LOW_ADDRESS_LIMIT	0x7fffffffUL

extern int memcpy_real(void *, void *, size_t);
extern void memcpy_absolute(void *, void *, size_t);

#define mem_assign_absolute(dest, val) {			\
	__typeof__(dest) __tmp = (val);				\
								\
	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));		\
	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));	\
}

#endif /* __ASSEMBLY__ */

#endif /* __ASM_S390_PROCESSOR_H */
Commit	Line	Data
	1	/*
	2	* S390 version
	3	* Copyright IBM Corp. 1999
	4	* Author(s): Hartmut Penner (hp@de.ibm.com),
	5	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	6	*
	7	* Derived from "include/asm-i386/processor.h"
	8	* Copyright (C) 1994, Linus Torvalds
	9	*/
	10
	11	#ifndef __ASM_S390_PROCESSOR_H
	12	#define __ASM_S390_PROCESSOR_H
	13
	14	#include <linux/const.h>
	15
	16	#define CIF_MCCK_PENDING 0 /* machine check handling is pending */
	17	#define CIF_ASCE 1 /* user asce needs fixup / uaccess */
	18	#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
	19	#define CIF_FPU 3 /* restore FPU registers */
	20	#define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */
	21	#define CIF_ENABLED_WAIT 5 /* in enabled wait state */
	22
	23	#define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING)
	24	#define _CIF_ASCE _BITUL(CIF_ASCE)
	25	#define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY)
	26	#define _CIF_FPU _BITUL(CIF_FPU)
	27	#define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ)
	28	#define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT)
	29
	30	#ifndef __ASSEMBLY__
	31
	32	#include <linux/linkage.h>
	33	#include <linux/irqflags.h>
	34	#include <asm/cpu.h>
	35	#include <asm/page.h>
	36	#include <asm/ptrace.h>
	37	#include <asm/setup.h>
	38	#include <asm/runtime_instr.h>
	39	#include <asm/fpu/types.h>
	40	#include <asm/fpu/internal.h>
	41
	42	static inline void set_cpu_flag(int flag)
	43	{
	44	S390_lowcore.cpu_flags \|= (1UL << flag);
	45	}
	46
	47	static inline void clear_cpu_flag(int flag)
	48	{
	49	S390_lowcore.cpu_flags &= ~(1UL << flag);
	50	}
	51
	52	static inline int test_cpu_flag(int flag)
	53	{
	54	return !!(S390_lowcore.cpu_flags & (1UL << flag));
	55	}
	56
	57	/*
	58	* Test CIF flag of another CPU. The caller needs to ensure that
	59	* CPU hotplug can not happen, e.g. by disabling preemption.
	60	*/
	61	static inline int test_cpu_flag_of(int flag, int cpu)
	62	{
	63	struct lowcore *lc = lowcore_ptr[cpu];
	64	return !!(lc->cpu_flags & (1UL << flag));
	65	}
	66
	67	#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
	68
	69	/*
	70	* Default implementation of macro that returns current
	71	* instruction pointer ("program counter").
	72	*/
	73	#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
	74
	75	static inline void get_cpu_id(struct cpuid *ptr)
	76	{
	77	asm volatile("stidp %0" : "=Q" (*ptr));
	78	}
	79
	80	void s390_adjust_jiffies(void);
	81	void s390_update_cpu_mhz(void);
	82	void cpu_detect_mhz_feature(void);
	83
	84	extern const struct seq_operations cpuinfo_op;
	85	extern int sysctl_ieee_emulation_warnings;
	86	extern void execve_tail(void);
	87
	88	/*
	89	* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
	90	*/
	91
	92	#define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
	93	(tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
	94	#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
	95	(1UL << 30) : (1UL << 41))
	96	#define TASK_SIZE TASK_SIZE_OF(current)
	97	#define TASK_MAX_SIZE (1UL << 53)
	98
	99	#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
	100	#define STACK_TOP_MAX (1UL << 42)
	101
	102	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	103
	104	typedef struct {
	105	__u32 ar4;
	106	} mm_segment_t;
	107
	108	/*
	109	* Thread structure
	110	*/
	111	struct thread_struct {
	112	unsigned int acrs[NUM_ACRS];
	113	unsigned long ksp; /* kernel stack pointer */
	114	unsigned long user_timer; /* task cputime in user space */
	115	unsigned long system_timer; /* task cputime in kernel space */
	116	unsigned long sys_call_table; /* system call table address */
	117	mm_segment_t mm_segment;
	118	unsigned long gmap_addr; /* address of last gmap fault. */
	119	unsigned int gmap_write_flag; /* gmap fault write indication */
	120	unsigned int gmap_int_code; /* int code of last gmap fault */
	121	unsigned int gmap_pfault; /* signal of a pending guest pfault */
	122	/* Per-thread information related to debugging */
	123	struct per_regs per_user; /* User specified PER registers */
	124	struct per_event per_event; /* Cause of the last PER trap */
	125	unsigned long per_flags; /* Flags to control debug behavior */
	126	unsigned int system_call; /* system call number in signal */
	127	unsigned long last_break; /* last breaking-event-address. */
	128	/* pfault_wait is used to block the process on a pfault event */
	129	unsigned long pfault_wait;
	130	struct list_head list;
	131	/* cpu runtime instrumentation */
	132	struct runtime_instr_cb *ri_cb;
	133	unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
	134	/*
	135	* Warning: 'fpu' is dynamically-sized. It MUST be at
	136	* the end.
	137	*/
	138	struct fpu fpu; /* FP and VX register save area */
	139	};
	140
	141	/* Flag to disable transactions. */
	142	#define PER_FLAG_NO_TE 1UL
	143	/* Flag to enable random transaction aborts. */
	144	#define PER_FLAG_TE_ABORT_RAND 2UL
	145	/* Flag to specify random transaction abort mode:
	146	* - abort each transaction at a random instruction before TEND if set.
	147	* - abort random transactions at a random instruction if cleared.
	148	*/
	149	#define PER_FLAG_TE_ABORT_RAND_TEND 4UL
	150
	151	typedef struct thread_struct thread_struct;
	152
	153	/*
	154	* Stack layout of a C stack frame.
	155	*/
	156	#ifndef __PACK_STACK
	157	struct stack_frame {
	158	unsigned long back_chain;
	159	unsigned long empty1[5];
	160	unsigned long gprs[10];
	161	unsigned int empty2[8];
	162	};
	163	#else
	164	struct stack_frame {
	165	unsigned long empty1[5];
	166	unsigned int empty2[8];
	167	unsigned long gprs[10];
	168	unsigned long back_chain;
	169	};
	170	#endif
	171
	172	#define ARCH_MIN_TASKALIGN 8
	173
	174	#define INIT_THREAD { \
	175	.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
	176	.fpu.regs = (void *) init_task.thread.fpu.fprs, \
	177	}
	178
	179	/*
	180	* Do necessary setup to start up a new thread.
	181	*/
	182	#define start_thread(regs, new_psw, new_stackp) do { \
	183	regs->psw.mask = PSW_USER_BITS \| PSW_MASK_EA \| PSW_MASK_BA; \
	184	regs->psw.addr = new_psw; \
	185	regs->gprs[15] = new_stackp; \
	186	execve_tail(); \
	187	} while (0)
	188
	189	#define start_thread31(regs, new_psw, new_stackp) do { \
	190	regs->psw.mask = PSW_USER_BITS \| PSW_MASK_BA; \
	191	regs->psw.addr = new_psw; \
	192	regs->gprs[15] = new_stackp; \
	193	crst_table_downgrade(current->mm); \
	194	execve_tail(); \
	195	} while (0)
	196
	197	/* Forward declaration, a strange C thing */
	198	struct task_struct;
	199	struct mm_struct;
	200	struct seq_file;
	201
	202	typedef int (dump_trace_func_t)(void data, unsigned long address, int reliable);
	203	void dump_trace(dump_trace_func_t func, void *data,
	204	struct task_struct *task, unsigned long sp);
	205
	206	void show_cacheinfo(struct seq_file *m);
	207
	208	/* Free all resources held by a thread. */
	209	extern void release_thread(struct task_struct *);
	210
	211	/*
	212	* Return saved PC of a blocked thread.
	213	*/
	214	extern unsigned long thread_saved_pc(struct task_struct *t);
	215
	216	unsigned long get_wchan(struct task_struct *p);
	217	#define task_pt_regs(tsk) ((struct pt_regs *) \
	218	(task_stack_page(tsk) + THREAD_SIZE) - 1)
	219	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
	220	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
	221
	222	/* Has task runtime instrumentation enabled ? */
	223	#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
	224
	225	static inline unsigned long current_stack_pointer(void)
	226	{
	227	unsigned long sp;
	228
	229	asm volatile("la %0,0(15)" : "=a" (sp));
	230	return sp;
	231	}
	232
	233	static inline unsigned short stap(void)
	234	{
	235	unsigned short cpu_address;
	236
	237	asm volatile("stap %0" : "=m" (cpu_address));
	238	return cpu_address;
	239	}
	240
	241	/*
	242	* Give up the time slice of the virtual PU.
	243	*/
	244	#define cpu_relax_yield cpu_relax_yield
	245	void cpu_relax_yield(void);
	246
	247	#define cpu_relax() barrier()
	248
	249	#define ECAG_CACHE_ATTRIBUTE 0
	250	#define ECAG_CPU_ATTRIBUTE 1
	251
	252	static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
	253	{
	254	unsigned long val;
	255
	256	asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
	257	: "=d" (val) : "a" (asi << 8 \| parm));
	258	return val;
	259	}
	260
	261	static inline void psw_set_key(unsigned int key)
	262	{
	263	asm volatile("spka 0(%0)" : : "d" (key));
	264	}
	265
	266	/*
	267	* Set PSW to specified value.
	268	*/
	269	static inline void __load_psw(psw_t psw)
	270	{
	271	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
	272	}
	273
	274	/*
	275	* Set PSW mask to specified value, while leaving the
	276	* PSW addr pointing to the next instruction.
	277	*/
	278	static inline void __load_psw_mask(unsigned long mask)
	279	{
	280	unsigned long addr;
	281	psw_t psw;
	282
	283	psw.mask = mask;
	284
	285	asm volatile(
	286	" larl %0,1f\n"
	287	" stg %0,%O1+8(%R1)\n"
	288	" lpswe %1\n"
	289	"1:"
	290	: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
	291	}
	292
	293	/*
	294	* Extract current PSW mask
	295	*/
	296	static inline unsigned long __extract_psw(void)
	297	{
	298	unsigned int reg1, reg2;
	299
	300	asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
	301	return (((unsigned long) reg1) << 32) \| ((unsigned long) reg2);
	302	}
	303
	304	static inline void local_mcck_enable(void)
	305	{
	306	__load_psw_mask(__extract_psw() \| PSW_MASK_MCHECK);
	307	}
	308
	309	static inline void local_mcck_disable(void)
	310	{
	311	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
	312	}
	313
	314	/*
	315	* Rewind PSW instruction address by specified number of bytes.
	316	*/
	317	static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
	318	{
	319	unsigned long mask;
	320
	321	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
	322	(psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
	323	(1UL << 24) - 1;
	324	return (psw.addr - ilc) & mask;
	325	}
	326
	327	/*
	328	* Function to stop a processor until the next interrupt occurs
	329	*/
	330	void enabled_wait(void);
	331
	332	/*
	333	* Function to drop a processor into disabled wait state
	334	*/
	335	static inline void __noreturn disabled_wait(unsigned long code)
	336	{
	337	psw_t psw;
	338
	339	psw.mask = PSW_MASK_BASE \| PSW_MASK_WAIT \| PSW_MASK_BA \| PSW_MASK_EA;
	340	psw.addr = code;
	341	__load_psw(psw);
	342	while (1);
	343	}
	344
	345	/*
	346	* Basic Machine Check/Program Check Handler.
	347	*/
	348
	349	extern void s390_base_mcck_handler(void);
	350	extern void s390_base_pgm_handler(void);
	351	extern void s390_base_ext_handler(void);
	352
	353	extern void (*s390_base_mcck_handler_fn)(void);
	354	extern void (*s390_base_pgm_handler_fn)(void);
	355	extern void (*s390_base_ext_handler_fn)(void);
	356
	357	#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
	358
	359	extern int memcpy_real(void , void , size_t);
	360	extern void memcpy_absolute(void , void , size_t);
	361
	362	#define mem_assign_absolute(dest, val) { \
	363	__typeof__(dest) __tmp = (val); \
	364	\
	365	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
	366	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
	367	}
	368
	369	#endif /* __ASSEMBLY__ */
	370
	371	#endif /* __ASM_S390_PROCESSOR_H */