From bcf0b0880710409420a4e3b15dbf4b9a63542c0b Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Wed, 30 Apr 2008 03:49:55 -0500 Subject: [POWERPC] Move to runtime allocated exception stacks For the additonal exception levels (critical, debug, machine check) on 40x/book-e we were using "static" allocations of the stack in the associated head.S. Move to a runtime allocation to make the code a bit easier to read as we mimic how we handle IRQ stacks. Its also a bit easier to setup the stack with a "dummy" thread_info in C code. Signed-off-by: Kumar Gala Acked-by: Paul Mackerras --- arch/powerpc/kernel/irq.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'arch/powerpc/kernel/irq.c') diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 2f73f705d564..b5199752ac60 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -356,9 +356,42 @@ void __init init_IRQ(void) { if (ppc_md.init_IRQ) ppc_md.init_IRQ(); + + exc_lvl_ctx_init(); + irq_ctx_init(); } +#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) +struct thread_info *critirq_ctx[NR_CPUS] __read_mostly; +struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly; +struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly; + +void exc_lvl_ctx_init(void) +{ + struct thread_info *tp; + int i; + + for_each_possible_cpu(i) { + memset((void *)critirq_ctx[i], 0, THREAD_SIZE); + tp = critirq_ctx[i]; + tp->cpu = i; + tp->preempt_count = 0; + +#ifdef CONFIG_BOOKE + memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE); + tp = dbgirq_ctx[i]; + tp->cpu = i; + tp->preempt_count = 0; + + memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE); + tp = mcheckirq_ctx[i]; + tp->cpu = i; + tp->preempt_count = HARDIRQ_OFFSET; +#endif + } +} +#endif #ifdef CONFIG_IRQSTACKS struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; -- cgit