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[PARISC] Allow nested interrupts

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Our prior mode of operation didn't allow nested interrupts
because it makes the interrupt code much simpler.  However,
nested interrupts are better for latency.

This code uses the EIEM register to simulate level interrupts
and thus achieve nesting.

Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Kyle McMartin <[email protected]>
This commit is contained in:
James Bottomley 2006-09-09 12:36:25 -07:00 • committed by Matthew Wilcox
commit 7085689ed1
4 changed files with 93 additions and 64 deletions
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2
include/asm-parisc/irq.h
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@ -39,6 +39,8 @@ struct irq_chip;
*/
void no_ack_irq(unsigned int irq);
void no_end_irq(unsigned int irq);
void cpu_ack_irq(unsigned int irq);
void cpu_end_irq(unsigned int irq);
extern int txn_alloc_irq(unsigned int nbits);
extern int txn_claim_irq(int);