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432 lines
10 KiB
432 lines
10 KiB
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
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* Copyright (C) 1996 by Paul M. Antoine
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* Copyright (C) 1999 Silicon Graphics
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* Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc.
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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/config.h>
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#include <linux/types.h>
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#include <asm/addrspace.h>
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#include <asm/cpu-features.h>
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#include <asm/ptrace.h>
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#include <asm/war.h>
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#include <asm/interrupt.h>
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/*
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* read_barrier_depends - Flush all pending reads that subsequents reads
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* depend on.
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*
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* No data-dependent reads from memory-like regions are ever reordered
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* over this barrier. All reads preceding this primitive are guaranteed
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* to access memory (but not necessarily other CPUs' caches) before any
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* reads following this primitive that depend on the data return by
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* any of the preceding reads. This primitive is much lighter weight than
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* rmb() on most CPUs, and is never heavier weight than is
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* rmb().
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*
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* These ordering constraints are respected by both the local CPU
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* and the compiler.
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*
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* Ordering is not guaranteed by anything other than these primitives,
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* not even by data dependencies. See the documentation for
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* memory_barrier() for examples and URLs to more information.
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*
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* For example, the following code would force ordering (the initial
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* value of "a" is zero, "b" is one, and "p" is "&a"):
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* b = 2;
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* memory_barrier();
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* p = &b; q = p;
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* read_barrier_depends();
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* d = *q;
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* </programlisting>
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*
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* because the read of "*q" depends on the read of "p" and these
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* two reads are separated by a read_barrier_depends(). However,
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* the following code, with the same initial values for "a" and "b":
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* a = 2;
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* memory_barrier();
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* b = 3; y = b;
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* read_barrier_depends();
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* x = a;
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* </programlisting>
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*
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* does not enforce ordering, since there is no data dependency between
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* the read of "a" and the read of "b". Therefore, on some CPUs, such
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* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
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* in cases like thiswhere there are no data dependencies.
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*/
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#define read_barrier_depends() do { } while(0)
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#ifdef CONFIG_CPU_HAS_SYNC
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#define __sync() \
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__asm__ __volatile__( \
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".set push\n\t" \
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".set noreorder\n\t" \
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".set mips2\n\t" \
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"sync\n\t" \
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".set pop" \
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: /* no output */ \
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: /* no input */ \
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: "memory")
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#else
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#define __sync() do { } while(0)
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#endif
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#define __fast_iob() \
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__asm__ __volatile__( \
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".set push\n\t" \
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".set noreorder\n\t" \
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"lw $0,%0\n\t" \
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"nop\n\t" \
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".set pop" \
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: /* no output */ \
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: "m" (*(int *)CKSEG1) \
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: "memory")
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#define fast_wmb() __sync()
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#define fast_rmb() __sync()
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#define fast_mb() __sync()
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#define fast_iob() \
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do { \
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__sync(); \
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__fast_iob(); \
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} while (0)
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#ifdef CONFIG_CPU_HAS_WB
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#include <asm/wbflush.h>
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#define wmb() fast_wmb()
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#define rmb() fast_rmb()
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#define mb() wbflush()
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#define iob() wbflush()
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#else /* !CONFIG_CPU_HAS_WB */
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#define wmb() fast_wmb()
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#define rmb() fast_rmb()
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#define mb() fast_mb()
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#define iob() fast_iob()
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#endif /* !CONFIG_CPU_HAS_WB */
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#ifdef CONFIG_SMP
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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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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while(0)
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#endif
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#define set_mb(var, value) \
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do { var = value; mb(); } while (0)
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#define set_wmb(var, value) \
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do { var = value; wmb(); } while (0)
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/*
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* switch_to(n) should switch tasks to task nr n, first
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* checking that n isn't the current task, in which case it does nothing.
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*/
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extern asmlinkage void *resume(void *last, void *next, void *next_ti);
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struct task_struct;
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#define switch_to(prev,next,last) \
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do { \
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(last) = resume(prev, next, next->thread_info); \
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} while(0)
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#define ROT_IN_PIECES \
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" .set noreorder \n" \
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" .set reorder \n"
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static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
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{
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__u32 retval;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ll %0, %3 # xchg_u32 \n"
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" move %2, %z4 \n"
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" sc %2, %1 \n"
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" beqzl %2, 1b \n"
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ROT_IN_PIECES
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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: "=&r" (retval), "=m" (*m), "=&r" (dummy)
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: "R" (*m), "Jr" (val)
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: "memory");
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} else if (cpu_has_llsc) {
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ll %0, %3 # xchg_u32 \n"
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" move %2, %z4 \n"
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" sc %2, %1 \n"
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" beqz %2, 1b \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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: "=&r" (retval), "=m" (*m), "=&r" (dummy)
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: "R" (*m), "Jr" (val)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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retval = *m;
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*m = val;
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local_irq_restore(flags); /* implies memory barrier */
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}
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return retval;
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}
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#ifdef CONFIG_64BIT
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static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
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{
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__u64 retval;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long dummy;
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__asm__ __volatile__(
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"1: lld %0, %3 # xchg_u64 \n"
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" move %2, %z4 \n"
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" scd %2, %1 \n"
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" beqzl %2, 1b \n"
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ROT_IN_PIECES
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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: "=&r" (retval), "=m" (*m), "=&r" (dummy)
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: "R" (*m), "Jr" (val)
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: "memory");
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} else if (cpu_has_llsc) {
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unsigned long dummy;
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__asm__ __volatile__(
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"1: lld %0, %3 # xchg_u64 \n"
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" move %2, %z4 \n"
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" scd %2, %1 \n"
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" beqz %2, 1b \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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: "=&r" (retval), "=m" (*m), "=&r" (dummy)
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: "R" (*m), "Jr" (val)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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retval = *m;
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*m = val;
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local_irq_restore(flags); /* implies memory barrier */
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}
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return retval;
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}
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#else
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extern __u64 __xchg_u64_unsupported_on_32bit_kernels(volatile __u64 * m, __u64 val);
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#define __xchg_u64 __xchg_u64_unsupported_on_32bit_kernels
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#endif
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid xchg(). */
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extern void __xchg_called_with_bad_pointer(void);
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static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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switch (size) {
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case 4:
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return __xchg_u32(ptr, x);
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case 8:
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return __xchg_u64(ptr, x);
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}
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__xchg_called_with_bad_pointer();
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return x;
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}
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#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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#define tas(ptr) (xchg((ptr),1))
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#define __HAVE_ARCH_CMPXCHG 1
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static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
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unsigned long new)
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{
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__u32 retval;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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" .set noat \n"
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"1: ll %0, %2 # __cmpxchg_u32 \n"
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" bne %0, %z3, 2f \n"
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" move $1, %z4 \n"
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" sc $1, %1 \n"
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" beqzl $1, 1b \n"
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ROT_IN_PIECES
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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"2: \n"
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" .set at \n"
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: "=&r" (retval), "=m" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set noat \n"
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"1: ll %0, %2 # __cmpxchg_u32 \n"
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" bne %0, %z3, 2f \n"
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" move $1, %z4 \n"
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" sc $1, %1 \n"
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" beqz $1, 1b \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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"2: \n"
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" .set at \n"
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: "=&r" (retval), "=m" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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retval = *m;
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if (retval == old)
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*m = new;
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local_irq_restore(flags); /* implies memory barrier */
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}
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return retval;
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}
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#ifdef CONFIG_64BIT
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static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
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unsigned long new)
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{
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__u64 retval;
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if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set noat \n"
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"1: lld %0, %2 # __cmpxchg_u64 \n"
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" bne %0, %z3, 2f \n"
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" move $1, %z4 \n"
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" scd $1, %1 \n"
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" beqzl $1, 1b \n"
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ROT_IN_PIECES
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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"2: \n"
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" .set at \n"
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: "=&r" (retval), "=m" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set noat \n"
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"1: lld %0, %2 # __cmpxchg_u64 \n"
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" bne %0, %z3, 2f \n"
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" move $1, %z4 \n"
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" scd $1, %1 \n"
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" beqz $1, 1b \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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"2: \n"
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" .set at \n"
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: "=&r" (retval), "=m" (*m)
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: "R" (*m), "Jr" (old), "Jr" (new)
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: "memory");
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} else {
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unsigned long flags;
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local_irq_save(flags);
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retval = *m;
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if (retval == old)
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*m = new;
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local_irq_restore(flags); /* implies memory barrier */
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}
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return retval;
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}
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#else
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extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
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volatile int * m, unsigned long old, unsigned long new);
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#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
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#endif
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid cmpxchg(). */
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extern void __cmpxchg_called_with_bad_pointer(void);
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static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
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unsigned long new, int size)
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{
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switch (size) {
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case 4:
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return __cmpxchg_u32(ptr, old, new);
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case 8:
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return __cmpxchg_u64(ptr, old, new);
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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}
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#define cmpxchg(ptr,old,new) ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
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extern void *set_except_vector(int n, void *addr);
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extern void per_cpu_trap_init(void);
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extern NORET_TYPE void __die(const char *, struct pt_regs *, const char *file,
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const char *func, unsigned long line);
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extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
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const char *func, unsigned long line);
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#define die(msg, regs) \
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__die(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
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#define die_if_kernel(msg, regs) \
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__die_if_kernel(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
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extern int stop_a_enabled;
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/*
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* See include/asm-ia64/system.h; prevents deadlock on SMP
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* systems.
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*/
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#define __ARCH_WANT_UNLOCKED_CTXSW
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#define arch_align_stack(x) (x)
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#endif /* _ASM_SYSTEM_H */
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