diff options
| -rw-r--r-- | arch/x86/include/asm/i8259.h | 13 | ||||
| -rw-r--r-- | arch/x86/kernel/i8259.c | 43 |
2 files changed, 56 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h index 58d7091eeb1f..e8a3e05c2882 100644 --- a/arch/x86/include/asm/i8259.h +++ b/arch/x86/include/asm/i8259.h @@ -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); diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c index df89102bef80..b80987ca33ea 100644 --- a/arch/x86/kernel/i8259.c +++ b/arch/x86/kernel/i8259.c @@ -358,3 +358,46 @@ void init_8259A(int auto_eoi) spin_unlock_irqrestore(&i8259A_lock, flags); } +/* + * make i8259 a driver so that we can select pic functions at run time. the goal + * is to make x86 binary compatible among pc compatible and non-pc compatible + * platforms, such as x86 MID. + */ + +static void __init legacy_pic_noop(void) { }; +static void __init legacy_pic_uint_noop(unsigned int unused) { }; +static void __init legacy_pic_int_noop(int unused) { }; + +static struct irq_chip dummy_pic_chip = { + .name = "dummy pic", + .mask = legacy_pic_uint_noop, + .unmask = legacy_pic_uint_noop, + .disable = legacy_pic_uint_noop, + .mask_ack = legacy_pic_uint_noop, +}; +static int legacy_pic_irq_pending_noop(unsigned int irq) +{ + return 0; +} + +struct legacy_pic null_legacy_pic = { + .nr_legacy_irqs = 0, + .chip = &dummy_pic_chip, + .mask_all = legacy_pic_noop, + .restore_mask = legacy_pic_noop, + .init = legacy_pic_int_noop, + .irq_pending = legacy_pic_irq_pending_noop, + .make_irq = legacy_pic_uint_noop, +}; + +struct legacy_pic default_legacy_pic = { + .nr_legacy_irqs = NR_IRQS_LEGACY, + .chip = &i8259A_chip, + .mask_all = mask_8259A, + .restore_mask = unmask_8259A, + .init = init_8259A, + .irq_pending = i8259A_irq_pending, + .make_irq = make_8259A_irq, +}; + +struct legacy_pic *legacy_pic = &default_legacy_pic; |