diff options
| author | Kumar Gala <galak@kernel.crashing.org> | 2008-04-28 16:21:22 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-29 15:57:34 +1000 |
| commit | 85218827cc4ca900867807f19345418164ffc108 (patch) | |
| tree | 1813b7fadb7c077acd0ef62f57385b7424ca0121 /arch/powerpc/kernel/entry_32.S | |
| parent | dd18434ff0b7d9b9ad3d596985fc84b329d2f9a8 (diff) | |
| download | linux-85218827cc4ca900867807f19345418164ffc108.tar.bz2 | |
[POWERPC] Add IRQSTACKS support on ppc32
This makes it possible to use separate stacks for hard and soft IRQs
on 32-bit powerpc as well as on 64-bit. The code for 32-bit is just
the 32-bit analog of the 64-bit code.
* Added allocation and initialization of the irq stacks. We limit the
stacks to be in lowmem for ppc32.
* Implemented ppc32 versions of call_do_softirq() and call_handle_irq()
to switch the stack pointers
* Reworked how we do stack overflow detection. We now keep around the
limit of the stack in the thread_struct and compare against the limit
to see if we've overflowed. We can now use this on ppc64 if desired.
[ paulus@samba.org: Fixed bug on 6xx where we need to reload r9 with the
thread_info pointer. ]
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 84c868633068..0c8614d9875c 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -137,11 +137,12 @@ transfer_to_handler: 2: /* if from kernel, check interrupted DOZE/NAP mode and * check for stack overflow */ - lwz r9,THREAD_INFO-THREAD(r12) - cmplw r1,r9 /* if r1 <= current->thread_info */ + lwz r9,KSP_LIMIT(r12) + cmplw r1,r9 /* if r1 <= ksp_limit */ ble- stack_ovf /* then the kernel stack overflowed */ 5: #ifdef CONFIG_6xx + rlwinm r9,r1,0,0,31-THREAD_SHIFT tophys(r9,r9) /* check local flags */ lwz r12,TI_LOCAL_FLAGS(r9) mtcrf 0x01,r12 |