94c12cc7d1
Major cleanup of all s390 inline assemblies. They now have a common coding style. Quite a few have been shortened, mainly by using register asm variables. Use of the EX_TABLE macro helps as well. The atomic ops, bit ops and locking inlines new use the Q-constraint if a newer gcc is used. That results in slightly better code. Thanks to Christian Borntraeger for proof reading the changes. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
392 lines
9.2 KiB
C
392 lines
9.2 KiB
C
/*
|
|
* 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)
|
|
|
|
/*
|
|
* On SMP systems, when the scheduler does migration-cost autodetection,
|
|
* it needs a way to flush as much of the CPU's caches as possible.
|
|
*
|
|
* TODO: fill this in!
|
|
*/
|
|
static inline void sched_cacheflush(void)
|
|
{
|
|
}
|
|
|
|
#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
|
|
|
|
#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; \
|
|
})
|
|
|
|
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");
|
|
x = old >> shift;
|
|
break;
|
|
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");
|
|
x = old >> shift;
|
|
break;
|
|
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");
|
|
x = old;
|
|
break;
|
|
#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");
|
|
x = old;
|
|
break;
|
|
#endif /* __s390x__ */
|
|
}
|
|
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))))
|
|
|
|
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__ */
|
|
}
|
|
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
|