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authorEric W. Biederman <ebiederm@xmission.com>2010-03-30 01:07:02 -0700
committerH. Peter Anvin <hpa@zytor.com>2010-05-04 13:34:23 -0700
commit2c2df8418ac7908eec4558407b83f16739006c54 (patch)
treebfd1056e37871bf504f6e2820482e6c2b0a9a0d5 /arch/ia64
parentd93ac51c7a129db7a1431d859a3ef45a0b1f3fc5 (diff)
x86, acpi/irq: Introduce apci_isa_irq_to_gsi
There are a number of cases where the current code makes the assumption that isa irqs identity map to the first 16 acpi global system intereupts. In most instances that assumption is correct as that is the required behaviour in dual i8259 mode and the default behavior in ioapic mode. However there are some systems out there that take advantage of acpis interrupt remapping for the isa irqs to have a completely different mapping of isa_irq to gsi. Introduce acpi_isa_irq_to_gsi to perform this mapping explicitly in the code that needs it. Initially this will be just the current assumed identity mapping to ensure it's introduction does not cause regressions. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> LKML-Reference: <1269936436-7039-1-git-send-email-ebiederm@xmission.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/acpi.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 4d1a7e9314c..c6c90f39f4d 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -785,6 +785,14 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
return 0;
}
+int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
+{
+ if (isa_irq >= 16)
+ return -1;
+ *gsi = isa_irq;
+ return 0;
+}
+
/*
* ACPI based hotplug CPU support
*/