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>
391 lines
9.2 KiB
C
391 lines
9.2 KiB
C
/*
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* include/asm-s390/system.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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*
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* Derived from "include/asm-i386/system.h"
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*/
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#ifndef __ASM_SYSTEM_H
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#define __ASM_SYSTEM_H
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#include <linux/kernel.h>
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#include <asm/types.h>
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#include <asm/ptrace.h>
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#include <asm/setup.h>
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#include <asm/processor.h>
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#ifdef __KERNEL__
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struct task_struct;
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extern struct task_struct *__switch_to(void *, void *);
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static inline void save_fp_regs(s390_fp_regs *fpregs)
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{
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asm volatile(
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" std 0,8(%1)\n"
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" std 2,24(%1)\n"
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" std 4,40(%1)\n"
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" std 6,56(%1)"
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: "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
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if (!MACHINE_HAS_IEEE)
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return;
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asm volatile(
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" stfpc 0(%1)\n"
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" std 1,16(%1)\n"
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" std 3,32(%1)\n"
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" std 5,48(%1)\n"
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" std 7,64(%1)\n"
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" std 8,72(%1)\n"
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" std 9,80(%1)\n"
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" std 10,88(%1)\n"
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" std 11,96(%1)\n"
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" std 12,104(%1)\n"
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" std 13,112(%1)\n"
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" std 14,120(%1)\n"
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" std 15,128(%1)\n"
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: "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
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}
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static inline void restore_fp_regs(s390_fp_regs *fpregs)
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{
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asm volatile(
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" ld 0,8(%0)\n"
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" ld 2,24(%0)\n"
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" ld 4,40(%0)\n"
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" ld 6,56(%0)"
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: : "a" (fpregs), "m" (*fpregs));
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if (!MACHINE_HAS_IEEE)
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return;
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asm volatile(
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" lfpc 0(%0)\n"
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" ld 1,16(%0)\n"
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" ld 3,32(%0)\n"
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" ld 5,48(%0)\n"
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" ld 7,64(%0)\n"
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" ld 8,72(%0)\n"
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" ld 9,80(%0)\n"
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" ld 10,88(%0)\n"
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" ld 11,96(%0)\n"
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" ld 12,104(%0)\n"
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" ld 13,112(%0)\n"
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" ld 14,120(%0)\n"
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" ld 15,128(%0)\n"
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: : "a" (fpregs), "m" (*fpregs));
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}
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static inline void save_access_regs(unsigned int *acrs)
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{
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asm volatile("stam 0,15,0(%0)" : : "a" (acrs) : "memory");
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}
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static inline void restore_access_regs(unsigned int *acrs)
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{
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asm volatile("lam 0,15,0(%0)" : : "a" (acrs));
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}
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#define switch_to(prev,next,last) do { \
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if (prev == next) \
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break; \
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save_fp_regs(&prev->thread.fp_regs); \
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restore_fp_regs(&next->thread.fp_regs); \
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save_access_regs(&prev->thread.acrs[0]); \
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restore_access_regs(&next->thread.acrs[0]); \
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prev = __switch_to(prev,next); \
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} while (0)
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/*
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* On SMP systems, when the scheduler does migration-cost autodetection,
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* it needs a way to flush as much of the CPU's caches as possible.
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*
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* TODO: fill this in!
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*/
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static inline void sched_cacheflush(void)
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{
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}
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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extern void account_vtime(struct task_struct *);
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extern void account_tick_vtime(struct task_struct *);
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extern void account_system_vtime(struct task_struct *);
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#else
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#define account_vtime(x) do { /* empty */ } while (0)
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#endif
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#define finish_arch_switch(prev) do { \
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set_fs(current->thread.mm_segment); \
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account_vtime(prev); \
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} while (0)
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#define nop() asm volatile("nop")
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#define xchg(ptr,x) \
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({ \
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__typeof__(*(ptr)) __ret; \
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__ret = (__typeof__(*(ptr))) \
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__xchg((unsigned long)(x), (void *)(ptr),sizeof(*(ptr))); \
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__ret; \
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})
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static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
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{
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unsigned long addr, old;
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int shift;
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switch (size) {
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case 1:
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addr = (unsigned long) ptr;
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shift = (3 ^ (addr & 3)) << 3;
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addr ^= addr & 3;
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asm volatile(
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" l %0,0(%4)\n"
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"0: lr 0,%0\n"
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" nr 0,%3\n"
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" or 0,%2\n"
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" cs %0,0,0(%4)\n"
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" jl 0b\n"
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: "=&d" (old), "=m" (*(int *) addr)
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: "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
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"m" (*(int *) addr) : "memory", "cc", "0");
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x = old >> shift;
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break;
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case 2:
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addr = (unsigned long) ptr;
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shift = (2 ^ (addr & 2)) << 3;
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addr ^= addr & 2;
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asm volatile(
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" l %0,0(%4)\n"
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"0: lr 0,%0\n"
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" nr 0,%3\n"
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" or 0,%2\n"
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" cs %0,0,0(%4)\n"
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" jl 0b\n"
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: "=&d" (old), "=m" (*(int *) addr)
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: "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
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"m" (*(int *) addr) : "memory", "cc", "0");
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x = old >> shift;
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break;
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case 4:
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asm volatile(
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" l %0,0(%3)\n"
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"0: cs %0,%2,0(%3)\n"
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" jl 0b\n"
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: "=&d" (old), "=m" (*(int *) ptr)
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: "d" (x), "a" (ptr), "m" (*(int *) ptr)
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: "memory", "cc");
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x = old;
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break;
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#ifdef __s390x__
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case 8:
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asm volatile(
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" lg %0,0(%3)\n"
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"0: csg %0,%2,0(%3)\n"
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" jl 0b\n"
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: "=&d" (old), "=m" (*(long *) ptr)
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: "d" (x), "a" (ptr), "m" (*(long *) ptr)
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: "memory", "cc");
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x = old;
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break;
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#endif /* __s390x__ */
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}
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return x;
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}
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/*
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* Atomic compare and exchange. Compare OLD with MEM, if identical,
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* store NEW in MEM. Return the initial value in MEM. Success is
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* indicated by comparing RETURN with OLD.
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*/
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#define __HAVE_ARCH_CMPXCHG 1
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#define cmpxchg(ptr,o,n)\
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((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
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(unsigned long)(n),sizeof(*(ptr))))
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static inline unsigned long
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
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{
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unsigned long addr, prev, tmp;
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int shift;
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switch (size) {
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case 1:
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addr = (unsigned long) ptr;
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shift = (3 ^ (addr & 3)) << 3;
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addr ^= addr & 3;
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asm volatile(
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" l %0,0(%4)\n"
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"0: nr %0,%5\n"
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" lr %1,%0\n"
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" or %0,%2\n"
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" or %1,%3\n"
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" cs %0,%1,0(%4)\n"
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" jnl 1f\n"
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" xr %1,%0\n"
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" nr %1,%5\n"
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" jnz 0b\n"
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"1:"
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: "=&d" (prev), "=&d" (tmp)
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: "d" (old << shift), "d" (new << shift), "a" (ptr),
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"d" (~(255 << shift))
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: "memory", "cc");
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return prev >> shift;
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case 2:
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addr = (unsigned long) ptr;
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shift = (2 ^ (addr & 2)) << 3;
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addr ^= addr & 2;
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asm volatile(
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" l %0,0(%4)\n"
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"0: nr %0,%5\n"
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" lr %1,%0\n"
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" or %0,%2\n"
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" or %1,%3\n"
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" cs %0,%1,0(%4)\n"
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" jnl 1f\n"
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" xr %1,%0\n"
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" nr %1,%5\n"
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" jnz 0b\n"
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"1:"
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: "=&d" (prev), "=&d" (tmp)
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: "d" (old << shift), "d" (new << shift), "a" (ptr),
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"d" (~(65535 << shift))
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: "memory", "cc");
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return prev >> shift;
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case 4:
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asm volatile(
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" cs %0,%2,0(%3)\n"
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: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
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: "memory", "cc");
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return prev;
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#ifdef __s390x__
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case 8:
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asm volatile(
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" csg %0,%2,0(%3)\n"
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: "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
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: "memory", "cc");
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return prev;
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#endif /* __s390x__ */
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}
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return old;
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}
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/*
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* Force strict CPU ordering.
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* And yes, this is required on UP too when we're talking
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* to devices.
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*
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* This is very similar to the ppc eieio/sync instruction in that is
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* does a checkpoint syncronisation & makes sure that
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* all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ).
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*/
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#define eieio() asm volatile("bcr 15,0" : : : "memory")
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#define SYNC_OTHER_CORES(x) eieio()
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#define mb() eieio()
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#define rmb() eieio()
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#define wmb() eieio()
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#define read_barrier_depends() do { } while(0)
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() read_barrier_depends()
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#define smp_mb__before_clear_bit() smp_mb()
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#define smp_mb__after_clear_bit() smp_mb()
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#define set_mb(var, value) do { var = value; mb(); } while (0)
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#ifdef __s390x__
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#define __ctl_load(array, low, high) ({ \
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typedef struct { char _[sizeof(array)]; } addrtype; \
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asm volatile( \
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" lctlg %1,%2,0(%0)\n" \
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: : "a" (&array), "i" (low), "i" (high), \
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"m" (*(addrtype *)(array))); \
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})
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#define __ctl_store(array, low, high) ({ \
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typedef struct { char _[sizeof(array)]; } addrtype; \
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asm volatile( \
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" stctg %2,%3,0(%1)\n" \
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: "=m" (*(addrtype *)(array)) \
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: "a" (&array), "i" (low), "i" (high)); \
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})
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#else /* __s390x__ */
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#define __ctl_load(array, low, high) ({ \
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typedef struct { char _[sizeof(array)]; } addrtype; \
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asm volatile( \
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" lctl %1,%2,0(%0)\n" \
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: : "a" (&array), "i" (low), "i" (high), \
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"m" (*(addrtype *)(array))); \
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})
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#define __ctl_store(array, low, high) ({ \
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typedef struct { char _[sizeof(array)]; } addrtype; \
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asm volatile( \
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" stctl %2,%3,0(%1)\n" \
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: "=m" (*(addrtype *)(array)) \
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: "a" (&array), "i" (low), "i" (high)); \
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})
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#endif /* __s390x__ */
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#define __ctl_set_bit(cr, bit) ({ \
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unsigned long __dummy; \
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__ctl_store(__dummy, cr, cr); \
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__dummy |= 1UL << (bit); \
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__ctl_load(__dummy, cr, cr); \
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})
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#define __ctl_clear_bit(cr, bit) ({ \
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unsigned long __dummy; \
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__ctl_store(__dummy, cr, cr); \
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__dummy &= ~(1UL << (bit)); \
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__ctl_load(__dummy, cr, cr); \
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})
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#include <linux/irqflags.h>
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/*
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* Use to set psw mask except for the first byte which
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* won't be changed by this function.
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*/
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static inline void
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__set_psw_mask(unsigned long mask)
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{
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__load_psw_mask(mask | (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
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}
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#define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS)
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#define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)
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#ifdef CONFIG_SMP
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extern void smp_ctl_set_bit(int cr, int bit);
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extern void smp_ctl_clear_bit(int cr, int bit);
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#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
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#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
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#else
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#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
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#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
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#endif /* CONFIG_SMP */
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extern void (*_machine_restart)(char *command);
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extern void (*_machine_halt)(void);
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extern void (*_machine_power_off)(void);
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#define arch_align_stack(x) (x)
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#endif /* __KERNEL__ */
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#endif
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