diff options
| author | cognet <cognet@FreeBSD.org> | 2009-02-12 23:23:30 +0000 |
|---|---|---|
| committer | cognet <cognet@FreeBSD.org> | 2009-02-12 23:23:30 +0000 |
| commit | a4557d874cea19c85b904233ff0bc7ec8fc632ee (patch) | |
| tree | 12b428cc8123665fb6db4a1437aa7d2d1f139c8c /sys/arm/include/sysarch.h | |
| parent | fd95932030a1e694173ce5b6c7d417ad5938b302 (diff) | |
| download | FreeBSD-src-a4557d874cea19c85b904233ff0bc7ec8fc632ee.zip FreeBSD-src-a4557d874cea19c85b904233ff0bc7ec8fc632ee.tar.gz | |
To prevent various race conditions in the RAS code, store and restore the
values in ARM_RAS_START and ARM_RAS_END at context switch time.
MFC after: 1 week
Diffstat (limited to 'sys/arm/include/sysarch.h')
| -rw-r--r-- | sys/arm/include/sysarch.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/arm/include/sysarch.h b/sys/arm/include/sysarch.h index 5623fd7..12db4df 100644 --- a/sys/arm/include/sysarch.h +++ b/sys/arm/include/sysarch.h @@ -42,6 +42,9 @@ * The ARM_TP_ADDRESS points to a special purpose page, which is used as local * store for the ARM per-thread data and Restartable Atomic Sequences support. * Put it just above the "high" vectors' page. + * the cpu_switch() code assumes ARM_RAS_START is ARM_TP_ADDRESS + 4, and + * ARM_RAS_END is ARM_TP_ADDRESS + 8, so if that ever changes, be sure to + * update the cpu_switch() (and cpu_throw()) code as well. */ #define ARM_TP_ADDRESS (ARM_VECTORS_HIGH + 0x1000) #define ARM_RAS_START (ARM_TP_ADDRESS + 4) |
