[deliverable/linux.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/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>

/*
 * 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));
}

extern void s390_adjust_jiffies(void);
extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;

/*
 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
 */
#ifndef CONFIG_64BIT

#define TASK_SIZE		(1UL << 31)
#define TASK_UNMAPPED_BASE	(1UL << 30)

#else /* CONFIG_64BIT */

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

#endif /* CONFIG_64BIT */

#ifndef CONFIG_64BIT
#define STACK_TOP		(1UL << 31)
#define STACK_TOP_MAX		(1UL << 31)
#else /* CONFIG_64BIT */
#define STACK_TOP		(1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
#define STACK_TOP_MAX		(1UL << 42)
#endif /* CONFIG_64BIT */

#define HAVE_ARCH_PICK_MMAP_LAYOUT

typedef struct {
        __u32 ar4;
} mm_segment_t;

/*
 * Thread structure
 */
struct thread_struct {
	s390_fp_regs fp_regs;
	unsigned int  acrs[NUM_ACRS];
        unsigned long ksp;              /* kernel stack pointer             */
	mm_segment_t mm_segment;
	unsigned long gmap_addr;	/* address of last gmap fault. */
	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 */
        /* 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;
	int ri_signum;
#ifdef CONFIG_64BIT
	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
#endif
};

#define PER_FLAG_NO_TE		1UL	/* Flag to disable transactions. */

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,	\
}

/*
 * 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 | PSW_ADDR_AMODE;			\
	regs->gprs[15]	= new_stackp;					\
} 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 | PSW_ADDR_AMODE;			\
	regs->gprs[15]	= new_stackp;					\
	__tlb_flush_mm(current->mm);					\
	crst_table_downgrade(current->mm, 1UL << 31);			\
	update_mm(current->mm, current);				\
} while (0)

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

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

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

extern void show_code(struct pt_regs *regs);
extern void print_fn_code(unsigned char *code, unsigned long len);

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])

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.
 */
static inline void cpu_relax(void)
{
	if (MACHINE_HAS_DIAG44)
		asm volatile("diag 0,0,68");
	barrier();
}

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)
{
#ifndef CONFIG_64BIT
	asm volatile("lpsw  %0" : : "Q" (psw) : "cc");
#else
	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
#endif
}

/*
 * 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;

#ifndef CONFIG_64BIT
	asm volatile(
		"	basr	%0,0\n"
		"0:	ahi	%0,1f-0b\n"
		"	st	%0,%O1+4(%R1)\n"
		"	lpsw	%1\n"
		"1:"
		: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
#else /* CONFIG_64BIT */
	asm volatile(
		"	larl	%0,1f\n"
		"	stg	%0,%O1+8(%R1)\n"
		"	lpswe	%1\n"
		"1:"
		: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
#endif /* CONFIG_64BIT */
}

/*
 * Rewind PSW instruction address by specified number of bytes.
 */
static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
{
#ifndef CONFIG_64BIT
	if (psw.addr & PSW_ADDR_AMODE)
		/* 31 bit mode */
		return (psw.addr - ilc) | PSW_ADDR_AMODE;
	/* 24 bit mode */
	return (psw.addr - ilc) & ((1UL << 24) - 1);
#else
	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;
#endif
}
 
/*
 * Function to drop a processor into disabled wait state
 */
static inline void __noreturn disabled_wait(unsigned long code)
{
        unsigned long ctl_buf;
        psw_t dw_psw;

	dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
        dw_psw.addr = code;
        /* 
         * Store status and then load disabled wait psw,
         * the processor is dead afterwards
         */
#ifndef CONFIG_64BIT
	asm volatile(
		"	stctl	0,0,0(%2)\n"
		"	ni	0(%2),0xef\n"	/* switch off protection */
		"	lctl	0,0,0(%2)\n"
		"	stpt	0xd8\n"		/* store timer */
		"	stckc	0xe0\n"		/* store clock comparator */
		"	stpx	0x108\n"	/* store prefix register */
		"	stam	0,15,0x120\n"	/* store access registers */
		"	std	0,0x160\n"	/* store f0 */
		"	std	2,0x168\n"	/* store f2 */
		"	std	4,0x170\n"	/* store f4 */
		"	std	6,0x178\n"	/* store f6 */
		"	stm	0,15,0x180\n"	/* store general registers */
		"	stctl	0,15,0x1c0\n"	/* store control registers */
		"	oi	0x1c0,0x10\n"	/* fake protection bit */
		"	lpsw	0(%1)"
		: "=m" (ctl_buf)
		: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
#else /* CONFIG_64BIT */
	asm volatile(
		"	stctg	0,0,0(%2)\n"
		"	ni	4(%2),0xef\n"	/* switch off protection */
		"	lctlg	0,0,0(%2)\n"
		"	lghi	1,0x1000\n"
		"	stpt	0x328(1)\n"	/* store timer */
		"	stckc	0x330(1)\n"	/* store clock comparator */
		"	stpx	0x318(1)\n"	/* store prefix register */
		"	stam	0,15,0x340(1)\n"/* store access registers */
		"	stfpc	0x31c(1)\n"	/* store fpu control */
		"	std	0,0x200(1)\n"	/* store f0 */
		"	std	1,0x208(1)\n"	/* store f1 */
		"	std	2,0x210(1)\n"	/* store f2 */
		"	std	3,0x218(1)\n"	/* store f3 */
		"	std	4,0x220(1)\n"	/* store f4 */
		"	std	5,0x228(1)\n"	/* store f5 */
		"	std	6,0x230(1)\n"	/* store f6 */
		"	std	7,0x238(1)\n"	/* store f7 */
		"	std	8,0x240(1)\n"	/* store f8 */
		"	std	9,0x248(1)\n"	/* store f9 */
		"	std	10,0x250(1)\n"	/* store f10 */
		"	std	11,0x258(1)\n"	/* store f11 */
		"	std	12,0x260(1)\n"	/* store f12 */
		"	std	13,0x268(1)\n"	/* store f13 */
		"	std	14,0x270(1)\n"	/* store f14 */
		"	std	15,0x278(1)\n"	/* store f15 */
		"	stmg	0,15,0x280(1)\n"/* store general registers */
		"	stctg	0,15,0x380(1)\n"/* store control registers */
		"	oi	0x384(1),0x10\n"/* fake protection bit */
		"	lpswe	0(%1)"
		: "=m" (ctl_buf)
		: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
#endif /* CONFIG_64BIT */
	while (1);
}

/*
 * 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 | (arch_local_save_flags() & ~(-1UL >> 8)));
}

#define local_mcck_enable() \
	__set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
#define local_mcck_disable() \
	__set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)

/*
 * 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

/*
 * Helper macro for exception table entries
 */
#ifndef CONFIG_64BIT
#define EX_TABLE(_fault,_target)			\
	".section __ex_table,\"a\"\n"			\
	"	.align 4\n"				\
	"	.long  " #_fault "," #_target "\n"	\
	".previous\n"
#else
#define EX_TABLE(_fault,_target)			\
	".section __ex_table,\"a\"\n"			\
	"	.align 8\n"				\
	"	.quad  " #_fault "," #_target "\n"	\
	".previous\n"
#endif

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                                 /* __ASM_S390_PROCESSOR_H           */
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* S390 version
a53c8fab	3	* Copyright IBM Corp. 1999
1da177e4 LT	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
edd53787	14	#include <linux/linkage.h>
a0616cde	15	#include <linux/irqflags.h>
e86a6ed6	16	#include <asm/cpu.h>
25097bf1	17	#include <asm/page.h>
1da177e4	18	#include <asm/ptrace.h>
25097bf1	19	#include <asm/setup.h>
e4b8b3f3	20	#include <asm/runtime_instr.h>
1da177e4	21
1da177e4 LT	22	/*
	23	* Default implementation of macro that returns current
	24	* instruction pointer ("program counter").
	25	*/
94c12cc7	26	#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
1da177e4	27
e86a6ed6	28	static inline void get_cpu_id(struct cpuid *ptr)
72960a02	29	{
987bcdac	30	asm volatile("stidp %0" : "=Q" (*ptr));
72960a02 MH	31	}
72960a02 MH	32
31ee4b2f	33	extern void s390_adjust_jiffies(void);
638ad34a MS	34	extern const struct seq_operations cpuinfo_op;
638ad34a MS	35	extern int sysctl_ieee_emulation_warnings;
1da177e4	36
1da177e4	37	/*
f481bfaf	38	* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
1da177e4	39	*/
f4815ac6	40	#ifndef CONFIG_64BIT
1da177e4	41
5a216a20 MS	42	#define TASK_SIZE (1UL << 31)
5a216a20 MS	43	#define TASK_UNMAPPED_BASE (1UL << 30)
1da177e4	44
f4815ac6	45	#else /* CONFIG_64BIT */
1da177e4	46
f481bfaf	47	#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
5a216a20 MS	48	#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
	49	(1UL << 30) : (1UL << 41))
	50	#define TASK_SIZE TASK_SIZE_OF(current)
1da177e4	51
f4815ac6	52	#endif /* CONFIG_64BIT */
1da177e4	53
f4815ac6	54	#ifndef CONFIG_64BIT
5a216a20	55	#define STACK_TOP (1UL << 31)
6252d702	56	#define STACK_TOP_MAX (1UL << 31)
f4815ac6	57	#else /* CONFIG_64BIT */
6252d702 MS	58	#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
6252d702 MS	59	#define STACK_TOP_MAX (1UL << 42)
f4815ac6	60	#endif /* CONFIG_64BIT */
922a70d3	61
1da177e4 LT	62	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	63
	64	typedef struct {
	65	__u32 ar4;
	66	} mm_segment_t;
	67
	68	/*
	69	* Thread structure
	70	*/
	71	struct thread_struct {
	72	s390_fp_regs fp_regs;
	73	unsigned int acrs[NUM_ACRS];
	74	unsigned long ksp; /* kernel stack pointer */
1da177e4	75	mm_segment_t mm_segment;
e5992f2e	76	unsigned long gmap_addr; /* address of last gmap fault. */
5e9a2692 MS	77	struct per_regs per_user; /* User specified PER registers */
5e9a2692 MS	78	struct per_event per_event; /* Cause of the last PER trap */
d35339a4	79	unsigned long per_flags; /* Flags to control debug behavior */
1da177e4 LT	80	/* pfault_wait is used to block the process on a pfault event */
1da177e4 LT	81	unsigned long pfault_wait;
f2db2e6c	82	struct list_head list;
e4b8b3f3 JG	83	/* cpu runtime instrumentation */
	84	struct runtime_instr_cb *ri_cb;
	85	int ri_signum;
d35339a4 MS	86	#ifdef CONFIG_64BIT
	87	unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
	88	#endif
1da177e4 LT	89	};
1da177e4 LT	90
d35339a4 MS	91	#define PER_FLAG_NO_TE 1UL /* Flag to disable transactions. */
d35339a4 MS	92
1da177e4 LT	93	typedef struct thread_struct thread_struct;
	94
	95	/*
	96	* Stack layout of a C stack frame.
	97	*/
	98	#ifndef __PACK_STACK
	99	struct stack_frame {
	100	unsigned long back_chain;
	101	unsigned long empty1[5];
	102	unsigned long gprs[10];
	103	unsigned int empty2[8];
	104	};
	105	#else
	106	struct stack_frame {
	107	unsigned long empty1[5];
	108	unsigned int empty2[8];
	109	unsigned long gprs[10];
	110	unsigned long back_chain;
	111	};
	112	#endif
	113
	114	#define ARCH_MIN_TASKALIGN 8
	115
6f3fa3f0 MS	116	#define INIT_THREAD { \
	117	.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
	118	}
1da177e4 LT	119
	120	/*
	121	* Do necessary setup to start up a new thread.
	122	*/
b50511e4 MS	123	#define start_thread(regs, new_psw, new_stackp) do { \
	124	regs->psw.mask = psw_user_bits \| PSW_MASK_EA \| PSW_MASK_BA; \
	125	regs->psw.addr = new_psw \| PSW_ADDR_AMODE; \
	126	regs->gprs[15] = new_stackp; \
63506c41 MS	127	} while (0)
63506c41 MS	128
b50511e4 MS	129	#define start_thread31(regs, new_psw, new_stackp) do { \
	130	regs->psw.mask = psw_user_bits \| PSW_MASK_BA; \
	131	regs->psw.addr = new_psw \| PSW_ADDR_AMODE; \
	132	regs->gprs[15] = new_stackp; \
0f6f281b	133	__tlb_flush_mm(current->mm); \
b50511e4	134	crst_table_downgrade(current->mm, 1UL << 31); \
0f6f281b	135	update_mm(current->mm, current); \
1da177e4 LT	136	} while (0)
1da177e4 LT	137
1da177e4 LT	138	/* Forward declaration, a strange C thing */
	139	struct task_struct;
	140	struct mm_struct;
df5f8314	141	struct seq_file;
1da177e4 LT	142
	143	/* Free all resources held by a thread. */
	144	extern void release_thread(struct task_struct *);
	145	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
	146
1da177e4 LT	147	/*
	148	* Return saved PC of a blocked thread.
	149	*/
	150	extern unsigned long thread_saved_pc(struct task_struct *t);
	151
bb11e3bd	152	extern void show_code(struct pt_regs *regs);
c10302ef	153	extern void print_fn_code(unsigned char *code, unsigned long len);
1da177e4 LT	154
1da177e4 LT	155	unsigned long get_wchan(struct task_struct *p);
c7584fb6	156	#define task_pt_regs(tsk) ((struct pt_regs *) \
30af7120	157	(task_stack_page(tsk) + THREAD_SIZE) - 1)
c7584fb6 AV	158	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
c7584fb6 AV	159	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
1da177e4	160
a0616cde DH	161	static inline unsigned short stap(void)
	162	{
	163	unsigned short cpu_address;
	164
	165	asm volatile("stap %0" : "=m" (cpu_address));
	166	return cpu_address;
	167	}
	168
1da177e4 LT	169	/*
	170	* Give up the time slice of the virtual PU.
	171	*/
abdba61a HC	172	static inline void cpu_relax(void)
	173	{
	174	if (MACHINE_HAS_DIAG44)
c48e0913 HC	175	asm volatile("diag 0,0,68");
c48e0913 HC	176	barrier();
abdba61a	177	}
1da177e4	178
dc74d7f9 HC	179	static inline void psw_set_key(unsigned int key)
	180	{
	181	asm volatile("spka 0(%0)" : : "d" (key));
	182	}
	183
77fa2245 HC	184	/*
	185	* Set PSW to specified value.
	186	*/
	187	static inline void __load_psw(psw_t psw)
	188	{
f4815ac6	189	#ifndef CONFIG_64BIT
987bcdac	190	asm volatile("lpsw %0" : : "Q" (psw) : "cc");
77fa2245	191	#else
987bcdac	192	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
77fa2245 HC	193	#endif
	194	}
	195
1da177e4 LT	196	/*
	197	* Set PSW mask to specified value, while leaving the
	198	* PSW addr pointing to the next instruction.
	199	*/
1da177e4 LT	200	static inline void __load_psw_mask (unsigned long mask)
	201	{
	202	unsigned long addr;
1da177e4	203	psw_t psw;
77fa2245	204
1da177e4 LT	205	psw.mask = mask;
1da177e4 LT	206
f4815ac6	207	#ifndef CONFIG_64BIT
94c12cc7 MS	208	asm volatile(
	209	" basr %0,0\n"
	210	"0: ahi %0,1f-0b\n"
987bcdac MS	211	" st %0,%O1+4(%R1)\n"
987bcdac MS	212	" lpsw %1\n"
1da177e4	213	"1:"
987bcdac	214	: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
f4815ac6	215	#else /* CONFIG_64BIT */
94c12cc7 MS	216	asm volatile(
94c12cc7 MS	217	" larl %0,1f\n"
987bcdac MS	218	" stg %0,%O1+8(%R1)\n"
987bcdac MS	219	" lpswe %1\n"
1da177e4	220	"1:"
987bcdac	221	: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
f4815ac6	222	#endif /* CONFIG_64BIT */
1da177e4	223	}
ccf45caf MS	224
	225	/*
	226	* Rewind PSW instruction address by specified number of bytes.
	227	*/
	228	static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
	229	{
f4815ac6	230	#ifndef CONFIG_64BIT
ccf45caf MS	231	if (psw.addr & PSW_ADDR_AMODE)
	232	/* 31 bit mode */
	233	return (psw.addr - ilc) \| PSW_ADDR_AMODE;
	234	/* 24 bit mode */
	235	return (psw.addr - ilc) & ((1UL << 24) - 1);
	236	#else
	237	unsigned long mask;
	238
	239	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
	240	(psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
	241	(1UL << 24) - 1;
	242	return (psw.addr - ilc) & mask;
	243	#endif
	244	}
1da177e4	245
1da177e4 LT	246	/*
	247	* Function to drop a processor into disabled wait state
	248	*/
ff2d8b19	249	static inline void __noreturn disabled_wait(unsigned long code)
1da177e4	250	{
1da177e4	251	unsigned long ctl_buf;
77fa2245	252	psw_t dw_psw;
1da177e4	253
b50511e4	254	dw_psw.mask = PSW_MASK_BASE \| PSW_MASK_WAIT \| PSW_MASK_BA \| PSW_MASK_EA;
77fa2245	255	dw_psw.addr = code;
1da177e4 LT	256	/*
	257	* Store status and then load disabled wait psw,
	258	* the processor is dead afterwards
	259	*/
f4815ac6	260	#ifndef CONFIG_64BIT
94c12cc7 MS	261	asm volatile(
	262	" stctl 0,0,0(%2)\n"
	263	" ni 0(%2),0xef\n" /* switch off protection */
	264	" lctl 0,0,0(%2)\n"
	265	" stpt 0xd8\n" /* store timer */
	266	" stckc 0xe0\n" /* store clock comparator */
	267	" stpx 0x108\n" /* store prefix register */
	268	" stam 0,15,0x120\n" /* store access registers */
	269	" std 0,0x160\n" /* store f0 */
	270	" std 2,0x168\n" /* store f2 */
	271	" std 4,0x170\n" /* store f4 */
	272	" std 6,0x178\n" /* store f6 */
	273	" stm 0,15,0x180\n" /* store general registers */
	274	" stctl 0,15,0x1c0\n" /* store control registers */
	275	" oi 0x1c0,0x10\n" /* fake protection bit */
	276	" lpsw 0(%1)"
	277	: "=m" (ctl_buf)
	278	: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
f4815ac6	279	#else /* CONFIG_64BIT */
94c12cc7 MS	280	asm volatile(
	281	" stctg 0,0,0(%2)\n"
	282	" ni 4(%2),0xef\n" /* switch off protection */
	283	" lctlg 0,0,0(%2)\n"
	284	" lghi 1,0x1000\n"
	285	" stpt 0x328(1)\n" /* store timer */
	286	" stckc 0x330(1)\n" /* store clock comparator */
	287	" stpx 0x318(1)\n" /* store prefix register */
	288	" stam 0,15,0x340(1)\n"/* store access registers */
	289	" stfpc 0x31c(1)\n" /* store fpu control */
	290	" std 0,0x200(1)\n" /* store f0 */
	291	" std 1,0x208(1)\n" /* store f1 */
	292	" std 2,0x210(1)\n" /* store f2 */
	293	" std 3,0x218(1)\n" /* store f3 */
	294	" std 4,0x220(1)\n" /* store f4 */
	295	" std 5,0x228(1)\n" /* store f5 */
	296	" std 6,0x230(1)\n" /* store f6 */
	297	" std 7,0x238(1)\n" /* store f7 */
	298	" std 8,0x240(1)\n" /* store f8 */
	299	" std 9,0x248(1)\n" /* store f9 */
	300	" std 10,0x250(1)\n" /* store f10 */
	301	" std 11,0x258(1)\n" /* store f11 */
	302	" std 12,0x260(1)\n" /* store f12 */
	303	" std 13,0x268(1)\n" /* store f13 */
	304	" std 14,0x270(1)\n" /* store f14 */
	305	" std 15,0x278(1)\n" /* store f15 */
	306	" stmg 0,15,0x280(1)\n"/* store general registers */
	307	" stctg 0,15,0x380(1)\n"/* store control registers */
	308	" oi 0x384(1),0x10\n"/* fake protection bit */
	309	" lpswe 0(%1)"
	310	: "=m" (ctl_buf)
bdd42b28	311	: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
f4815ac6	312	#endif /* CONFIG_64BIT */
edd53787	313	while (1);
1da177e4 LT	314	}
1da177e4 LT	315
a0616cde DH	316	/*
	317	* Use to set psw mask except for the first byte which
	318	* won't be changed by this function.
	319	*/
	320	static inline void
	321	__set_psw_mask(unsigned long mask)
	322	{
	323	__load_psw_mask(mask \| (arch_local_save_flags() & ~(-1UL >> 8)));
	324	}
	325
	326	#define local_mcck_enable() \
	327	__set_psw_mask(psw_kernel_bits \| PSW_MASK_DAT \| PSW_MASK_MCHECK)
	328	#define local_mcck_disable() \
	329	__set_psw_mask(psw_kernel_bits \| PSW_MASK_DAT)
	330
ab14de6c HC	331	/*
	332	* Basic Machine Check/Program Check Handler.
	333	*/
	334
	335	extern void s390_base_mcck_handler(void);
	336	extern void s390_base_pgm_handler(void);
	337	extern void s390_base_ext_handler(void);
	338
	339	extern void (*s390_base_mcck_handler_fn)(void);
	340	extern void (*s390_base_pgm_handler_fn)(void);
	341	extern void (*s390_base_ext_handler_fn)(void);
	342
dfd54cbc HC	343	#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
dfd54cbc HC	344
de1a3f1c MS	345	/*
	346	* Helper macro for exception table entries
	347	*/
f4815ac6	348	#ifndef CONFIG_64BIT
de1a3f1c MS	349	#define EX_TABLE(_fault,_target) \
	350	".section __ex_table,\"a\"\n" \
	351	" .align 4\n" \
	352	" .long " #_fault "," #_target "\n" \
	353	".previous\n"
	354	#else
	355	#define EX_TABLE(_fault,_target) \
	356	".section __ex_table,\"a\"\n" \
	357	" .align 8\n" \
	358	" .quad " #_fault "," #_target "\n" \
	359	".previous\n"
	360	#endif
	361
fbe76568 HC	362	extern int memcpy_real(void , void , size_t);
	363	extern void memcpy_absolute(void , void , size_t);
	364
	365	#define mem_assign_absolute(dest, val) { \
	366	__typeof__(dest) __tmp = (val); \
	367	\
	368	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
	369	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
	370	}
	371
1da177e4	372	#endif /* __ASM_S390_PROCESSOR_H */