diff options
Diffstat (limited to 'hw/acpi/aml-build.c')
| -rw-r--r-- | hw/acpi/aml-build.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c index 9222e8fd90..0ab808717f 100644 --- a/hw/acpi/aml-build.c +++ b/hw/acpi/aml-build.c @@ -1275,6 +1275,20 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed, addr_trans, len, flags); } +/* ACPI 1.0b: 6.4.2.2 DMA Format/6.4.2.2.1 ASL Macro for DMA Descriptor */ +Aml *aml_dma(AmlDmaType typ, AmlDmaBusMaster bm, AmlTransferSize sz, + uint8_t channel) +{ + Aml *var = aml_alloc(); + uint8_t flags = sz | bm << 2 | typ << 5; + + assert(channel < 8); + build_append_byte(var->buf, 0x2A); /* Byte 0: DMA Descriptor */ + build_append_byte(var->buf, 1U << channel); /* Byte 1: _DMA - DmaChannel */ + build_append_byte(var->buf, flags); /* Byte 2 */ + return var; +} + /* ACPI 1.0b: 16.2.5.3 Type 1 Opcodes Encoding: DefSleep */ Aml *aml_sleep(uint64_t msec) { |