acpigen: Add acpigen_write_irq.
Change-Id: Iba52dc2d52b7ac9a65d1d17b43e7204f5ede373e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/5241
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/arch/x86/boot/acpigen.c b/src/arch/x86/boot/acpigen.c
index 6496d75..fdb7e02 100644
--- a/src/arch/x86/boot/acpigen.c
+++ b/src/arch/x86/boot/acpigen.c
@@ -623,6 +623,21 @@
return 15;
}
+int acpigen_write_irq(u16 mask)
+{
+ /*
+ * acpi 3.0b section 6.4.2.1: IRQ Descriptor
+ * Byte 0:
+ * Bit7 : 0 => small item
+ * Bit6-3: 0100 (0x4) => IRQ port descriptor
+ * Bit2-0: 010 (0x2) => 2 Bytes long
+ */
+ acpigen_emit_byte(0x22);
+ acpigen_emit_byte(mask & 0xff);
+ acpigen_emit_byte((mask >> 8) & 0xff);
+ return 3;
+}
+
int acpigen_write_io16(u16 min, u16 max, u8 align, u8 len, u8 decode16)
{
/*