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authorMike Frysinger <vapier@gentoo.org>2009-11-03 03:14:38 +0000
committerMike Frysinger <vapier@gentoo.org>2009-11-25 02:35:39 -0500
commitf99e8c1d0f41011870d14d5990c65e65b123f2ef (patch)
tree6b35870bf38310d700d2349792775f8634cb261f /arch
parentaf5d7fc7e4d8e34bad42178f7011287e94eeb3ed (diff)
Blackfin: work around testset anomaly 05000477
Ironically, the atomic testset instruction cannot be interrupted else it will produce incorrect results. So disable interrupts to help it out. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/mach-bf561/atomic.S14
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S
index 0261a5e751b..f99f174b129 100644
--- a/arch/blackfin/mach-bf561/atomic.S
+++ b/arch/blackfin/mach-bf561/atomic.S
@@ -19,6 +19,16 @@
\reg\().h = _corelock;
.endm
+.macro safe_testset addr:req, scratch:req
+#if ANOMALY_05000477
+ cli \scratch;
+ testset (\addr);
+ sti \scratch;
+#else
+ testset (\addr);
+#endif
+.endm
+
/*
* r0 = address of atomic data to flush and invalidate (32bit).
*
@@ -33,7 +43,7 @@ ENTRY(_get_core_lock)
cli r0;
coreslot_loadaddr p0;
.Lretry_corelock:
- testset (p0);
+ safe_testset p0, r2;
if cc jump .Ldone_corelock;
SSYNC(r2);
jump .Lretry_corelock
@@ -56,7 +66,7 @@ ENTRY(_get_core_lock_noflush)
cli r0;
coreslot_loadaddr p0;
.Lretry_corelock_noflush:
- testset (p0);
+ safe_testset p0, r2;
if cc jump .Ldone_corelock_noflush;
SSYNC(r2);
jump .Lretry_corelock_noflush