From b2adce70ce6efa1a94ac262af3642d8b82ae6473 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 27 Oct 2000 00:02:02 +0000
Subject: Backport the __restore_flags fixes from mips64, clean xchg().

---
 include/asm-mips/system.h | 146 +++++++++++++++++-----------------------------
 1 file changed, 54 insertions(+), 92 deletions(-)

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 35800cd5b..deca93a7b 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -60,54 +60,54 @@ __cli(void)
 		: "$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"			\
+#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 */		\
+#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")
 
-extern void __inline__
-__restore_flags(int flags)
-{
-	__asm__ __volatile__(
-		".set\tpush\n\t"
-		".set\treorder\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"
-		".set\tnoreorder\n\t"
-		"mtc0\t%0,$12\n\t"
-		"nop\n\t"
-		"nop\n\t"
-		"nop\n\t"
-		".set\tpop\n\t"
-		:
-		: "r" (flags)
-		: "$8", "$9", "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)
 
 /*
  * Non-SMP versions ...
@@ -191,17 +191,17 @@ extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
 	unsigned long dummy;
 
 	__asm__ __volatile__(
-		".set\tnoreorder\n\t"
+		".set\tnoreorder\t\t\t# xchg_u32\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"
-		"ll\t%0,(%1)\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), "=r" (m), "=r" (dummy)
-		: "1" (m), "2" (val)
+		: "=r" (val), "=o" (*m), "=r" (dummy)
+		: "o" (*m), "2" (val)
 		: "memory");
 
 	return val;
@@ -218,54 +218,16 @@ extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
 #endif /* Processor-dependent optimization */
 }
 
-/*
- * 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().
- *
- * This only works if the compiler isn't horribly bad at optimizing.
- * gcc-2.5.8 reportedly can't handle this, but I define that one to
- * be dead anyway.
- */
-extern void __xchg_called_with_bad_pointer(void);
-
-static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+static __inline__ unsigned long
+__xchg(unsigned long x, volatile void * ptr, int size)
 {
 	switch (size) {
 		case 4:
 			return xchg_u32(ptr, x);
-#if defined(__mips64)
-		case 8:
-			return xchg_u64(ptr, x);
-#endif
 	}
-	__xchg_called_with_bad_pointer();
 	return x;
 }
 
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