diff options
Diffstat (limited to 'src/arch/x86/boot/acpigen.c')
| -rw-r--r-- | src/arch/x86/boot/acpigen.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/arch/x86/boot/acpigen.c b/src/arch/x86/boot/acpigen.c index 6496d759de..fdb7e02c9b 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) { /* |