diff options
| author | Kumar Gala <galak@kernel.crashing.org> | 2008-04-30 03:49:55 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-06-02 14:54:42 -0500 |
| commit | bcf0b0880710409420a4e3b15dbf4b9a63542c0b (patch) | |
| tree | ca1c813648ea075b772112237fde3ccfe3ddb776 /arch/powerpc/kernel/setup_32.c | |
| parent | c054065bc10a7ee2bcf78b5bc95f4b4d9bdc923a (diff) | |
[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 <galak@kernel.crashing.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/setup_32.c')
| -rw-r--r-- | arch/powerpc/kernel/setup_32.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index 5112a4aa801d..bef0be3fd98b 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -248,6 +248,28 @@ static void __init irqstack_early_init(void) #define irqstack_early_init() #endif +#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) +static void __init exc_lvl_early_init(void) +{ + unsigned int i; + + /* interrupt stacks must be in lowmem, we get that for free on ppc32 + * as the lmb is limited to lowmem by LMB_REAL_LIMIT */ + for_each_possible_cpu(i) { + critirq_ctx[i] = (struct thread_info *) + __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); +#ifdef CONFIG_BOOKE + dbgirq_ctx[i] = (struct thread_info *) + __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); + mcheckirq_ctx[i] = (struct thread_info *) + __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); +#endif + } +} +#else +#define exc_lvl_early_init() +#endif + /* Warning, IO base is not yet inited */ void __init setup_arch(char **cmdline_p) { @@ -305,6 +327,8 @@ void __init setup_arch(char **cmdline_p) init_mm.end_data = (unsigned long) _edata; init_mm.brk = klimit; + exc_lvl_early_init(); + irqstack_early_init(); /* set up the bootmem stuff with available memory */ |