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authorKumar Gala <galak@kernel.crashing.org>2008-04-28 16:21:22 +1000
committerPaul Mackerras <paulus@samba.org>2008-04-29 15:57:34 +1000
commit85218827cc4ca900867807f19345418164ffc108 (patch)
tree1813b7fadb7c077acd0ef62f57385b7424ca0121 /include/asm-powerpc
parentdd18434ff0b7d9b9ad3d596985fc84b329d2f9a8 (diff)
downloadop-kernel-dev-85218827cc4ca900867807f19345418164ffc108.zip
op-kernel-dev-85218827cc4ca900867807f19345418164ffc108.tar.gz
[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 'include/asm-powerpc')
-rw-r--r--include/asm-powerpc/processor.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index fd98ca9..cf83f2d 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -138,6 +138,8 @@ typedef struct {
struct thread_struct {
unsigned long ksp; /* Kernel stack pointer */
+ unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
+
#ifdef CONFIG_PPC64
unsigned long ksp_vsid;
#endif
@@ -182,11 +184,14 @@ struct thread_struct {
#define ARCH_MIN_TASKALIGN 16
#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
+#define INIT_SP_LIMIT \
+ (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
#ifdef CONFIG_PPC32
#define INIT_THREAD { \
.ksp = INIT_SP, \
+ .ksp_limit = INIT_SP_LIMIT, \
.fs = KERNEL_DS, \
.pgdir = swapper_pg_dir, \
.fpexc_mode = MSR_FE0 | MSR_FE1, \
@@ -194,6 +199,7 @@ struct thread_struct {
#else
#define INIT_THREAD { \
.ksp = INIT_SP, \
+ .ksp_limit = INIT_SP_LIMIT, \
.regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
.fs = KERNEL_DS, \
.fpr = {0}, \
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