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x86/ioapic: Add io_apic_ops driver layer to allow interception

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Xen dom0 needs to paravirtualize IO operations to the IO APIC,
so add a io_apic_ops for it to intercept.  Do this as ops
structure because there's at least some chance that another
paravirtualized environment may want to intercept these.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: jwboyer@redhat.com
Cc: yinghai@kernel.org
Link: http://lkml.kernel.org/r/1332385090-18056-2-git-send-email-konrad.wilk@oracle.com
[ Made all the affected code easier on the eyes ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jeremy Fitzhardinge
2012-03-21 22:58:08 -04:00
committed by Ingo Molnar
parent a3c8121b87
commit 136d249ef7
2 changed files with 60 additions and 7 deletions
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9
arch/x86/include/asm/io_apic.h
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@@ -21,6 +21,15 @@
#define IO_APIC_REDIR_LEVEL_TRIGGER (1 << 15)
#define IO_APIC_REDIR_MASKED (1 << 16)
struct io_apic_ops {
void (*init) (void);
unsigned int (*read) (unsigned int apic, unsigned int reg);
void (*write) (unsigned int apic, unsigned int reg, unsigned int value);
void (*modify)(unsigned int apic, unsigned int reg, unsigned int value);
};
void __init set_io_apic_ops(const struct io_apic_ops *);
/*
* The structure of the IO-APIC:
*/