patch-2.3.48 linux/include/asm-mips64/system.h

• Lines: 229
• Date: Thu Feb 24 22:53:35 2000
• Orig file: v2.3.47/linux/include/asm-mips64/system.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.47/linux/include/asm-mips64/system.h linux/include/asm-mips64/system.h
@@ -0,0 +1,228 @@
+/* $Id: system.h,v 1.5 2000/01/27 07:48:08 kanoj Exp $
+ *
+ * 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, 1995, 1996, 1997, 1998, 1999 by Ralf Baechle
+ * Modified further for R[236]000 by Paul M. Antoine, 1996
+ * Copyright (C) 1999 Silicon Graphics
+ */
+#ifndef _ASM_SYSTEM_H
+#define _ASM_SYSTEM_H
+
+#include <asm/sgidefs.h>
+#include <linux/kernel.h>
+
+extern __inline__ void
+__sti(void)
+{
+	__asm__ __volatile__(
+		".set\tnoreorder\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\tat\n\t"
+		".set\treorder"
+		: /* 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\tnoreorder\n\t"
+		".set\tnoat\n\t"
+		"mfc0\t$1,$12\n\t"
+		"ori\t$1,1\n\t"
+		"xori\t$1,1\n\t"
+		"mtc0\t$1,$12\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		".set\tat\n\t"
+		".set\treorder"
+		: /* no outputs */
+		: /* no inputs */
+		: "$1", "memory");
+}
+
+#define __save_flags(x)                  \
+__asm__ __volatile__(                    \
+	".set\tnoreorder\n\t"            \
+	"mfc0\t%0,$12\n\t"               \
+	".set\treorder"                  \
+	: "=r" (x)                       \
+	: /* no inputs */                \
+	: "memory")
+
+#define __save_and_cli(x)                \
+__asm__ __volatile__(                    \
+	".set\tnoreorder\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"                 \
+	"mtc0\t$1,$12\n\t"               \
+	"nop\n\t"                        \
+	"nop\n\t"                        \
+	"nop\n\t"                        \
+	".set\tat\n\t"                   \
+	".set\treorder"                  \
+	: "=r" (x)                       \
+	: /* no inputs */                \
+	: "$1", "memory")
+
+extern void __inline__
+__restore_flags(int flags)
+{
+	__asm__ __volatile__(
+		".set\tnoreorder\n\t"
+		"mfc0\t$8,$12\n\t"
+		"li\t$9,0xff00\n\t"
+		"and\t$8,$9\n\t"
+		"nor\t$9,$0,$9\n\t"
+		"and\t%0,$9\n\t"
+		"or\t%0,$8\n\t"
+		"mtc0\t%0,$12\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		".set\treorder"
+		: /* no output */
+		: "r" (flags)
+		: "$8", "$9", "memory");
+}
+
+/*
+ * Non-SMP versions ...
+ */
+#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)
+
+/* 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 ...
+ */
+#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()
+
+#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)
+
+#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.
+ */
+extern asmlinkage void *resume(void *last, void *next);
+#endif /* !defined (_LANGUAGE_ASSEMBLY) */
+
+#define prepare_to_switch()	do { } while(0)
+#define switch_to(prev,next,last) \
+do { \
+	(last) = resume(prev, next); \
+} while(0)
+
+extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
+{
+	unsigned long dummy;
+
+	__asm__ __volatile__(
+		".set\tnoreorder\n\t"
+		".set\tnoat\n\t"
+		"ll\t%0,(%1)\n"
+		"1:\tmove\t$1,%2\n\t"
+		"sc\t$1,(%1)\n\t"
+		"beqzl\t$1,1b\n\t"
+		"lld\t%0,(%1)\n\t"
+		".set\tat\n\t"
+		".set\treorder"
+		: "=r" (val), "=r" (m), "=r" (dummy)
+		: "1" (m), "2" (val)
+		: "memory");
+
+	return val;
+}
+
+/*
+ * Only used for 64 bit kernel.
+ */
+extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val)
+{
+	unsigned long dummy;
+
+	__asm__ __volatile__(
+		".set\tnoreorder\n\t"
+		".set\tnoat\n\t"
+		"lld\t%0,(%1)\n"
+		"1:\tmove\t$1,%2\n\t"
+		"scd\t$1,(%1)\n\t"
+		"beqzl\t$1,1b\n\t"
+		"lld\t%0,(%1)\n\t"
+		".set\tat\n\t"
+		".set\treorder"
+		: "=r" (val), "=r" (m), "=r" (dummy)
+		: "1" (m), "2" (val)
+		: "memory");
+
+	return val;
+}
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+#define tas(ptr) (xchg((ptr),1))
+
+/* This function doesn't exist, so you'll get a linker error if something
+   tries to do an invalid xchg().  */
+extern void __xchg_called_with_bad_pointer(void);
+
+static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+{
+	switch (size) {
+		case 4:
+			return xchg_u32(ptr, x);
+		case 8:
+			return xchg_u64(ptr, x);
+	}
+	__xchg_called_with_bad_pointer();
+	return x;
+}
+
+extern void set_except_vector(int n, void *addr);
+
+#endif /* _ASM_SYSTEM_H */