diff options
| author | Robin Getz <robin.getz@analog.com> | 2008-01-27 08:38:56 +0100 |
|---|---|---|
| committer | Bryan Wu <bryan.wu@analog.com> | 2008-01-27 08:38:56 +0100 |
| commit | 13fe24f37df20e580a5a364e67ec8cf3219d8f8c (patch) | |
| tree | c790da8a840c6fdc3e6f5eacccadede92e329d7c /include/asm-blackfin | |
| parent | [Blackfin] arch: Add a note describing what is going on - no functional changes (diff) | |
| download | linux-13fe24f37df20e580a5a364e67ec8cf3219d8f8c.tar.xz linux-13fe24f37df20e580a5a364e67ec8cf3219d8f8c.zip | |
[Blackfin] arch: fix bug - trap_tests fails to recover on some tests.
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3719
When the CPLBs get a miss, we do:
- find a victim in the HW table
- remove the victim
- find the replacement in the software table
- put it into the HW table.
If we can't find a replacement in the software table, we accidently
leave a duplicate in the HW table. This patch ensures that duplicate
is marked as not valid.
What we should do is find the replacement in the software table, before
we find a victim in the HW table - but its too late in the release cycle
to do that much restructuring of this code.
Rather that duplicate code, connect Hardware Errors (irq5) into trap_c,
so user space processes get killed properly.
The rest of irq_panic() can be moved into traps.c (later)
There is still a small corner case that causes problems when a
pheriperal interrupt goes off a single cycle before a user space
hardware error. This causes a kernel panic, rather than the user
space process being killed.
But, this checkin makes things work in 99.9% of the cases, and is a vast
improvement from what is there today (which fails 100% of the time).
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'include/asm-blackfin')
| -rw-r--r-- | include/asm-blackfin/traps.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-blackfin/traps.h b/include/asm-blackfin/traps.h index ee1cbf73a9ab..f0e5f940d9ca 100644 --- a/include/asm-blackfin/traps.h +++ b/include/asm-blackfin/traps.h @@ -45,6 +45,10 @@ #define VEC_CPLB_I_M (44) #define VEC_CPLB_I_MHIT (45) #define VEC_ILL_RES (46) /* including unvalid supervisor mode insn */ +/* The hardware reserves (63) for future use - we use it to tell our + * normal exception handling code we have a hardware error + */ +#define VEC_HWERR (63) #ifndef __ASSEMBLY__ |