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| author | Jacob Pan <jacob.jun.pan@intel.com> | 2009-11-09 20:24:14 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-20 01:25:17 +0100 |
| commit | ef3548668c02cc8c3922f4423f32b53e662811c6 (patch) | |
| tree | c9f2b35d0614185bcecd31c94a564ca7e03ca53f /arch/x86/kernel/i8259.c | |
| parent | x86: Initialize stack canary in secondary start (diff) | |
| download | linux-ef3548668c02cc8c3922f4423f32b53e662811c6.tar.xz linux-ef3548668c02cc8c3922f4423f32b53e662811c6.zip | |
x86, pic: Introduce legacy_pic abstraction
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>
Diffstat (limited to 'arch/x86/kernel/i8259.c')
| -rw-r--r-- | arch/x86/kernel/i8259.c | 43 |
1 files changed, 43 insertions, 0 deletions
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; |