arch/s390/include/asm/processor.h - linux/kernel/git/klassert/ipsec - Git at Google

 /*
  *  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>

 /*
  * 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 */
         /* pfault_wait is used to block the process on a pfault event */
 	unsigned long pfault_wait;
 	struct list_head list;
 };

 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);

 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           */
	/*
	* 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>

	/*
	* 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 */
	/* pfault_wait is used to block the process on a pfault event */
	unsigned long pfault_wait;
	struct list_head list;
	};

	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);

	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 */