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-rw-r--r--arch/mips/include/asm/system.h268
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diff --git a/arch/mips/include/asm/system.h b/arch/mips/include/asm/system.h
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 1999 by Ralf Baechle
+ * Copyright (C) 1996 by Paul M. Antoine
+ * Copyright (C) 1994 - 1999 by Ralf Baechle
+ *
+ * Changed set_except_vector declaration to allow return of previous
+ * vector address value - necessary for "borrowing" vectors.
+ *
+ * Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.
+ */
+#ifndef _ASM_SYSTEM_H
+#define _ASM_SYSTEM_H
+
+#include <linux/config.h>
+#include <asm/sgidefs.h>
+#include <asm/ptrace.h>
+#if 0
+#include <linux/kernel.h>
+#endif
+
+extern __inline__ void
+__sti(void)
+{
+ __asm__ __volatile__(
+ ".set\tpush\n\t"
+ ".set\treorder\n\t"
+ ".set\tnoat\n\t"
+ "mfc0\t$1,$12\n\t"
+ "ori\t$1,0x1f\n\t"
+ "xori\t$1,0x1e\n\t"
+ "mtc0\t$1,$12\n\t"
+ ".set\tpop\n\t"
+ : /* no outputs */
+ : /* no inputs */
+ : "$1", "memory");
+}
+
+/*
+ * For cli() we have to insert nops to make shure that the new value
+ * has actually arrived in the status register before the end of this
+ * macro.
+ * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
+ * no nops at all.
+ */
+extern __inline__ void
+__cli(void)
+{
+ __asm__ __volatile__(
+ ".set\tpush\n\t"
+ ".set\treorder\n\t"
+ ".set\tnoat\n\t"
+ "mfc0\t$1,$12\n\t"
+ "ori\t$1,1\n\t"
+ "xori\t$1,1\n\t"
+ ".set\tnoreorder\n\t"
+ "mtc0\t$1,$12\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ ".set\tpop\n\t"
+ : /* no outputs */
+ : /* no inputs */
+ : "$1", "memory");
+}
+
+#define __save_flags(x) \
+__asm__ __volatile__( \
+ ".set\tpush\n\t" \
+ ".set\treorder\n\t" \
+ "mfc0\t%0,$12\n\t" \
+ ".set\tpop\n\t" \
+ : "=r" (x))
+
+#define __save_and_cli(x) \
+__asm__ __volatile__( \
+ ".set\tpush\n\t" \
+ ".set\treorder\n\t" \
+ ".set\tnoat\n\t" \
+ "mfc0\t%0,$12\n\t" \
+ "ori\t$1,%0,1\n\t" \
+ "xori\t$1,1\n\t" \
+ ".set\tnoreorder\n\t" \
+ "mtc0\t$1,$12\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ ".set\tpop\n\t" \
+ : "=r" (x) \
+ : /* no inputs */ \
+ : "$1", "memory")
+
+#define __restore_flags(flags) \
+do { \
+ unsigned long __tmp1; \
+ \
+ __asm__ __volatile__( \
+ ".set\tnoreorder\t\t\t# __restore_flags\n\t" \
+ ".set\tnoat\n\t" \
+ "mfc0\t$1, $12\n\t" \
+ "andi\t%0, 1\n\t" \
+ "ori\t$1, 1\n\t" \
+ "xori\t$1, 1\n\t" \
+ "or\t%0, $1\n\t" \
+ "mtc0\t%0, $12\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ ".set\tat\n\t" \
+ ".set\treorder" \
+ : "=r" (__tmp1) \
+ : "0" (flags) \
+ : "$1", "memory"); \
+} while(0)
+
+#ifdef CONFIG_SMP
+
+extern void __global_sti(void);
+extern void __global_cli(void);
+extern unsigned long __global_save_flags(void);
+extern void __global_restore_flags(unsigned long);
+# define sti() __global_sti()
+# define cli() __global_cli()
+# define save_flags(x) do { x = __global_save_flags(); } while (0)
+# define restore_flags(x) __global_restore_flags(x)
+# define save_and_cli(x) do { save_flags(x); cli(); } while(0)
+
+#else /* Single processor */
+
+# define sti() __sti()
+# define cli() __cli()
+# define save_flags(x) __save_flags(x)
+# define save_and_cli(x) __save_and_cli(x)
+# define restore_flags(x) __restore_flags(x)
+
+#endif /* SMP */
+
+/* For spinlocks etc */
+#define local_irq_save(x) __save_and_cli(x);
+#define local_irq_restore(x) __restore_flags(x);
+#define local_irq_disable() __cli();
+#define local_irq_enable() __sti();
+
+/*
+ * These are probably defined overly paranoid ...
+ */
+#ifdef CONFIG_CPU_HAS_WB
+
+#include <asm/wbflush.h>
+#define rmb() do { } while(0)
+#define wmb() wbflush()
+#define mb() wbflush()
+
+#else /* CONFIG_CPU_HAS_WB */
+
+#define mb() \
+__asm__ __volatile__( \
+ "# prevent instructions being moved around\n\t" \
+ ".set\tnoreorder\n\t" \
+ "# 8 nops to fool the R4400 pipeline\n\t" \
+ "nop;nop;nop;nop;nop;nop;nop;nop\n\t" \
+ ".set\treorder" \
+ : /* no output */ \
+ : /* no input */ \
+ : "memory")
+#define rmb() mb()
+#define wmb() mb()
+
+#endif /* CONFIG_CPU_HAS_WB */
+
+#ifdef CONFIG_SMP
+#define smp_mb() mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
+#else
+#define smp_mb() barrier()
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+#endif
+
+#define set_mb(var, value) \
+do { var = value; mb(); } while (0)
+
+#define set_wmb(var, value) \
+do { var = value; wmb(); } while (0)
+
+#if !defined (_LANGUAGE_ASSEMBLY)
+/*
+ * switch_to(n) should switch tasks to task nr n, first
+ * checking that n isn't the current task, in which case it does nothing.
+ */
+#if 0
+extern asmlinkage void *resume(void *last, void *next);
+#endif
+#endif /* !defined (_LANGUAGE_ASSEMBLY) */
+
+#define prepare_to_switch() do { } while(0)
+#define switch_to(prev,next,last) \
+do { \
+ (last) = resume(prev, next); \
+} while(0)
+
+/*
+ * For 32 and 64 bit operands we can take advantage of ll and sc.
+ * FIXME: This doesn't work for R3000 machines.
+ */
+extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
+{
+#ifdef CONFIG_CPU_HAS_LLSC
+ unsigned long dummy;
+
+ __asm__ __volatile__(
+ ".set\tnoreorder\t\t\t# xchg_u32\n\t"
+ ".set\tnoat\n\t"
+ "ll\t%0, %3\n"
+ "1:\tmove\t$1, %2\n\t"
+ "sc\t$1, %1\n\t"
+ "beqzl\t$1, 1b\n\t"
+ " ll\t%0, %3\n\t"
+ ".set\tat\n\t"
+ ".set\treorder"
+ : "=r" (val), "=o" (*m), "=r" (dummy)
+ : "o" (*m), "2" (val)
+ : "memory");
+
+ return val;
+#else
+ unsigned long flags, retval;
+
+ save_flags(flags);
+ cli();
+ retval = *m;
+ *m = val;
+ restore_flags(flags);
+ return retval;
+#endif /* Processor-dependent optimization */
+}
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+#define tas(ptr) (xchg((ptr),1))
+
+static __inline__ unsigned long
+__xchg(unsigned long x, volatile void * ptr, int size)
+{
+ switch (size) {
+ case 4:
+ return xchg_u32(ptr, x);
+ }
+ return x;
+}
+
+extern void *set_except_vector(int n, void *addr);
+
+extern void __die(const char *, struct pt_regs *, const char *where,
+ unsigned long line) __attribute__((noreturn));
+extern void __die_if_kernel(const char *, struct pt_regs *, const char *where,
+ unsigned long line);
+
+#define die(msg, regs) \
+ __die(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
+#define die_if_kernel(msg, regs) \
+ __die_if_kernel(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
+
+#endif /* _ASM_SYSTEM_H */
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