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| 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/misc_32.S | |
| parent | dd18434ff0b7d9b9ad3d596985fc84b329d2f9a8 (diff) | |
| download | linux-85218827cc4ca900867807f19345418164ffc108.tar.gz linux-85218827cc4ca900867807f19345418164ffc108.tar.bz2 linux-85218827cc4ca900867807f19345418164ffc108.zip | |
[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/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index 92ccc6fcc5b0..89aaaa6f3561 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -32,6 +32,31 @@ .text +#ifdef CONFIG_IRQSTACKS +_GLOBAL(call_do_softirq) + mflr r0 + stw r0,4(r1) + stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) + mr r1,r3 + bl __do_softirq + lwz r1,0(r1) + lwz r0,4(r1) + mtlr r0 + blr + +_GLOBAL(call_handle_irq) + mflr r0 + stw r0,4(r1) + mtctr r6 + stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) + mr r1,r5 + bctrl + lwz r1,0(r1) + lwz r0,4(r1) + mtlr r0 + blr +#endif /* CONFIG_IRQSTACKS */ + /* * This returns the high 64 bits of the product of two 64-bit numbers. */ |