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x86, pic: Introduce legacy_pic abstraction

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This patch makes i8259A like legacy programmable interrupt controller
code into a driver so that legacy pic functions can be selected at
runtime based on platform information, such as HW subarchitecure ID.
Default structure of legacy_pic maintains the current code path for
x86pc.

Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com>
LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80D03@orsmsx508.amr.corp.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jacob Pan
2009-11-09 11:24:14 -08:00
committed by H. Peter Anvin
parent 35f720c593
commit ef3548668c
2 changed files with 56 additions and 0 deletions
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13
arch/x86/include/asm/i8259.h
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@@ -57,6 +57,19 @@ static inline void outb_pic(unsigned char value, unsigned int port)
extern struct irq_chip i8259A_chip;
struct legacy_pic {
int nr_legacy_irqs;
struct irq_chip *chip;
void (*mask_all)(void);
void (*restore_mask)(void);
void (*init)(int auto_eoi);
int (*irq_pending)(unsigned int irq);
void (*make_irq)(unsigned int irq);
};
extern struct legacy_pic *legacy_pic;
extern struct legacy_pic null_legacy_pic;
extern void mask_8259A(void);
extern void unmask_8259A(void);