sparc64: Implement IRQ stacks.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2008-08-12 18:33:56 -07:00
parent e34456825d
commit 4f70f7a91b
8 changed files with 161 additions and 30 deletions

View File

@@ -682,10 +682,32 @@ void ack_bad_irq(unsigned int virt_irq)
ino, virt_irq);
}
void *hardirq_stack[NR_CPUS];
void *softirq_stack[NR_CPUS];
static __attribute__((always_inline)) void *set_hardirq_stack(void)
{
void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
if (orig_sp < sp ||
orig_sp > (sp + THREAD_SIZE)) {
sp += THREAD_SIZE - 192 - STACK_BIAS;
__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
}
return orig_sp;
}
static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
{
__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
}
void handler_irq(int irq, struct pt_regs *regs)
{
unsigned long pstate, bucket_pa;
struct pt_regs *old_regs;
void *orig_sp;
clear_softint(1 << irq);
@@ -703,6 +725,8 @@ void handler_irq(int irq, struct pt_regs *regs)
"i" (PSTATE_IE)
: "memory");
orig_sp = set_hardirq_stack();
while (bucket_pa) {
struct irq_desc *desc;
unsigned long next_pa;
@@ -719,10 +743,38 @@ void handler_irq(int irq, struct pt_regs *regs)
bucket_pa = next_pa;
}
restore_hardirq_stack(orig_sp);
irq_exit();
set_irq_regs(old_regs);
}
void do_softirq(void)
{
unsigned long flags;
if (in_interrupt())
return;
local_irq_save(flags);
if (local_softirq_pending()) {
void *orig_sp, *sp = softirq_stack[smp_processor_id()];
sp += THREAD_SIZE - 192 - STACK_BIAS;
__asm__ __volatile__("mov %%sp, %0\n\t"
"mov %1, %%sp"
: "=&r" (orig_sp)
: "r" (sp));
__do_softirq();
__asm__ __volatile__("mov %0, %%sp"
: : "r" (orig_sp));
}
local_irq_restore(flags);
}
#ifdef CONFIG_HOTPLUG_CPU
void fixup_irqs(void)
{