From: John Hodge <tpg@mutabah.net>
Date: Sun, 28 Aug 2011 04:06:24 +0000 (+0800)
Subject: Kernel/arm7 - Fixed SPINLOCK to use the swap opcode
X-Git-Tag: rel0.11~114
X-Git-Url: https://git.ucc.asn.au/?a=commitdiff_plain;h=7ec592a682de215659959788d20b49f0225c56e2;hp=263e8355dbbcee8d38db03753811c0a8246d04e9;p=tpg%2Facess2.git

Kernel/arm7 - Fixed SPINLOCK to use the swap opcode
---

diff --git a/Kernel/arch/arm7/include/lock.h b/Kernel/arch/arm7/include/lock.h
index e270145c..dbcac936 100644
--- a/Kernel/arch/arm7/include/lock.h
+++ b/Kernel/arch/arm7/include/lock.h
@@ -28,12 +28,16 @@ static inline int SHORTLOCK(struct sShortSpinlock *Lock)
 {
 	#if 0
 	while( __sync_lock_test_and_set( &Lock->Lock, 1 ) == 1 );
-	#endif
-	#if 1
+	#elif 0
 	while( Lock->Lock )	;
 	Lock->Lock = 1;
-	#endif
-	#if 0
+	#elif 1
+	 int	v = 1;
+	while( v )
+	{
+		__asm__ __volatile__ ("swp [%0], %1" : "=r" (v) : "r" (&lock));
+	}
+	#elif 0
 	// Shamelessly copied from linux (/arch/arm/include/asm/spinlock.h) until I can fix stuff
 	Uint	tmp;
 	__asm__ __volatile__ (