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| author | Mike Frysinger <vapier@gentoo.org> | 2009-11-03 03:14:38 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-11-25 02:35:39 -0500 |
| commit | f99e8c1d0f41011870d14d5990c65e65b123f2ef (patch) | |
| tree | 6b35870bf38310d700d2349792775f8634cb261f /arch/blackfin/mach-bf561 | |
| parent | af5d7fc7e4d8e34bad42178f7011287e94eeb3ed (diff) | |
| download | op-kernel-dev-f99e8c1d0f41011870d14d5990c65e65b123f2ef.zip op-kernel-dev-f99e8c1d0f41011870d14d5990c65e65b123f2ef.tar.gz | |
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/blackfin/mach-bf561')
| -rw-r--r-- | arch/blackfin/mach-bf561/atomic.S | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S index 0261a5e..f99f174 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 |
