diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2000-03-12 23:15:27 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2000-03-12 23:15:27 +0000 |
| commit | ae38fd1e4c98588314a42097c5a5e77dcef23561 (patch) | |
| tree | f9f10c203bb9e5fbad4810d1f8774c08dfad20ff /arch/sparc64/kernel/smp.c | |
| parent | 466a823d79f41d0713b272e48fd73e494b0588e0 (diff) | |
Merge with Linux 2.3.50.
Diffstat (limited to 'arch/sparc64/kernel/smp.c')
| -rw-r--r-- | arch/sparc64/kernel/smp.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c index 175372877..96360b010 100644 --- a/arch/sparc64/kernel/smp.c +++ b/arch/sparc64/kernel/smp.c @@ -312,6 +312,13 @@ static inline void xcall_deliver(u64 data0, u64 data1, u64 data2, u64 pstate, un smp_processor_id(), data0, data1, data2, target); #endif again: + /* Ok, this is the real Spitfire Errata #54. + * One must read back from a UDB internal register + * after writes to the UDB interrupt dispatch, but + * before the membar Sync for that write. + * So we use the high UDB control register (ASI 0x7f, + * ADDR 0x20) for the dummy read. -DaveM + */ tmp = 0x40; __asm__ __volatile__(" wrpr %1, %2, %%pstate @@ -321,10 +328,13 @@ again: stxa %6, [%0+%8] %3 membar #Sync stxa %%g0, [%7] %3 + mov 0x20, %%g1 + ldxa [%%g1] 0x7f, %%g0 membar #Sync" : "=r" (tmp) : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_UDB_INTR_W), - "r" (data0), "r" (data1), "r" (data2), "r" (target), "r" (0x10), "0" (tmp)); + "r" (data0), "r" (data1), "r" (data2), "r" (target), "r" (0x10), "0" (tmp) + : "g1"); /* NOTE: PSTATE_IE is still clear. */ stuck = 100000; |