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/*
* 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/config.h>
#ifdef __KERNEL__
#include <asm/lowcore.h>
#endif
#include <linux/kernel.h>
#define prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) do { \
if (prev == next) \
break; \
save_fp_regs1(&prev->thread.fp_regs); \
restore_fp_regs1(&next->thread.fp_regs); \
last = resume(&prev->thread,&next->thread); \
} while (0)
struct task_struct;
#define nop() __asm__ __volatile__ ("nop")
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
switch (size) {
case 1:
asm volatile (
" lhi 1,3\n"
" nr 1,%0\n" /* isolate last 2 bits */
" xr 1,%0\n" /* align ptr */
" bras 2,0f\n"
" icm 1,8,%1\n" /* for ptr&3 == 0 */
" stcm 0,8,%1\n"
" icm 1,4,%1\n" /* for ptr&3 == 1 */
" stcm 0,4,%1\n"
" icm 1,2,%1\n" /* for ptr&3 == 2 */
" stcm 0,2,%1\n"
" icm 1,1,%1\n" /* for ptr&3 == 3 */
" stcm 0,1,%1\n"
"0: sll 1,3\n"
" la 2,0(1,2)\n" /* r2 points to an icm */
" l 0,%1\n" /* get fullword */
"1: lr 1,0\n" /* cs loop */
" ex 0,0(2)\n" /* insert x */
" cs 0,1,%1\n"
" jl 1b\n"
" ex 0,4(2)" /* store *ptr to x */
: "+a&" (ptr) : "m" (x)
: "memory", "0", "1", "2");
case 2:
if(((__u32)ptr)&1)
panic("misaligned (__u16 *) in __xchg\n");
asm volatile (
" lhi 1,2\n"
" nr 1,%0\n" /* isolate bit 2^1 */
" xr 1,%0\n" /* align ptr */
" bras 2,0f\n"
" icm 1,12,%1\n" /* for ptr&2 == 0 */
" stcm 0,12,%1\n"
" icm 1,3,%1\n" /* for ptr&2 == 1 */
" stcm 0,3,%1\n"
"0: sll 1,2\n"
" la 2,0(1,2)\n" /* r2 points to an icm */
" l 0,%1\n" /* get fullword */
"1: lr 1,0\n" /* cs loop */
" ex 0,0(2)\n" /* insert x */
" cs 0,1,%1\n"
" jl 1b\n"
" ex 0,4(2)" /* store *ptr to x */
: "+a&" (ptr) : "m" (x)
: "memory", "0", "1", "2");
break;
case 4:
if(((__u32)ptr)&3)
panic("misaligned (__u32 *) in __xchg\n");
asm volatile (
" l 0,0(%1)\n"
"0: cs 0,%0,0(%1)\n"
" jl 0b\n"
" lr %0,0\n"
: "+d&" (x) : "a" (ptr)
: "memory", "0" );
break;
default:
abort();
}
return x;
}
/*
* 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")
# define SYNC_OTHER_CORES(x) eieio()
#define mb() eieio()
#define rmb() eieio()
#define wmb() eieio()
#define set_mb(var, value) do { var = value; mb(); } while (0)
#define set_rmb(var, value) do { var = value; rmb(); } while (0)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
/* interrupt control.. */
#define __sti() ({ \
__u8 dummy; \
__asm__ __volatile__ ( \
"stosm %0,0x03" : "=m" (dummy) : : "memory"); \
})
#define __cli() ({ \
__u32 flags; \
__asm__ __volatile__ ( \
"stnsm %0,0xFC" : "=m" (flags) : : "memory"); \
flags; \
})
#define __save_flags(x) \
__asm__ __volatile__("stosm %0,0" : "=m" (x) : : "memory")
#define __restore_flags(x) \
__asm__ __volatile__("ssm %0" : : "m" (x) : "memory")
#define __ctl_set_bit(cr, bit) ({ \
__u8 dummy[16]; \
__asm__ __volatile__ ( \
" la 1,%0\n" /* align to 8 byte */ \
" ahi 1,7\n" \
" srl 1,3\n" \
" sll 1,3\n" \
" bras 2,0f\n" /* skip indirect insns */ \
" stctl 0,0,0(1)\n" \
" lctl 0,0,0(1)\n" \
"0: ex %1,0(2)\n" /* execute stctl */ \
" l 0,0(1)\n" \
" or 0,%2\n" /* set the bit */ \
" st 0,0(1)\n" \
"1: ex %1,4(2)" /* execute lctl */ \
: "=m" (dummy) : "a" (cr*17), "a" (1<<(bit)) \
: "0", "1", "2"); \
})
#define __ctl_clear_bit(cr, bit) ({ \
__u8 dummy[16]; \
__asm__ __volatile__ ( \
" la 1,%0\n" /* align to 8 byte */ \
" ahi 1,7\n" \
" srl 1,3\n" \
" sll 1,3\n" \
" bras 2,0f\n" /* skip indirect insns */ \
" stctl 0,0,0(1)\n" \
" lctl 0,0,0(1)\n" \
"0: ex %1,0(2)\n" /* execute stctl */ \
" l 0,0(1)\n" \
" nr 0,%2\n" /* set the bit */ \
" st 0,0(1)\n" \
"1: ex %1,4(2)" /* execute lctl */ \
: "=m" (dummy) : "a" (cr*17), "a" (~(1<<(bit))) \
: "0", "1", "2"); \
})
/* For spinlocks etc */
#define local_irq_save(x) ((x) = __cli())
#define local_irq_restore(x) __restore_flags(x)
#define local_irq_disable() __cli()
#define local_irq_enable() __sti()
#ifdef CONFIG_SMP
extern void __global_cli(void);
extern void __global_sti(void);
extern unsigned long __global_save_flags(void);
extern void __global_restore_flags(unsigned long);
#define cli() __global_cli()
#define sti() __global_sti()
#define save_flags(x) ((x)=__global_save_flags())
#define restore_flags(x) __global_restore_flags(x)
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 cli() __cli()
#define sti() __sti()
#define save_flags(x) __save_flags(x)
#define restore_flags(x) __restore_flags(x)
#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
#endif
#ifdef __KERNEL__
extern struct task_struct *resume(void *,void *);
extern int save_fp_regs1(s390_fp_regs *fpregs);
extern void save_fp_regs(s390_fp_regs *fpregs);
extern int restore_fp_regs1(s390_fp_regs *fpregs);
extern void restore_fp_regs(s390_fp_regs *fpregs);
extern void show_crashed_task_info(void);
#endif
#endif
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