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-rw-r--r--src/arch/x86/boot/acpigen.c15
-rw-r--r--src/arch/x86/include/arch/acpigen.h1
2 files changed, 16 insertions, 0 deletions
diff --git a/src/arch/x86/boot/acpigen.c b/src/arch/x86/boot/acpigen.c
index 6496d759d..fdb7e02c9 100644
--- a/src/arch/x86/boot/acpigen.c
+++ b/src/arch/x86/boot/acpigen.c
@@ -623,6 +623,21 @@ int acpigen_write_register(acpi_addr_t *addr)
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)
{
/*
diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h
index be138ce74..2ff996727 100644
--- a/src/arch/x86/include/arch/acpigen.h
+++ b/src/arch/x86/include/arch/acpigen.h
@@ -62,6 +62,7 @@ int acpigen_write_resourcetemplate_header(void);
int acpigen_write_resourcetemplate_footer(int len);
int acpigen_write_mainboard_resource_template(void);
int acpigen_write_mainboard_resources(const char *scope, const char *name);
+int acpigen_write_irq(u16 mask);
int get_cst_entries(acpi_cstate_t **);