acpi add aml_dma()

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 34 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)
 {
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index d906105a82..dd3e1cacc8 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -35,6 +35,24 @@ struct Aml {
 typedef struct Aml Aml;
 
 typedef enum {
+    AML_COMPATIBILITY = 0,
+    AML_TYPEA = 1,
+    AML_TYPEB = 2,
+    AML_TYPEF = 3,
+} AmlDmaType;
+
+typedef enum {
+    AML_NOTBUSMASTER = 0,
+    AML_BUSMASTER = 1,
+} AmlDmaBusMaster;
+
+typedef enum {
+    AML_TRANSFER8 = 0,
+    AML_TRANSFER8_16 = 1,
+    AML_TRANSFER16 = 2,
+} AmlTransferSize;
+
+typedef enum {
     AML_DECODE10 = 0,
     AML_DECODE16 = 1,
 } AmlIODecode;
@@ -305,6 +323,8 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed,
                       uint64_t addr_gran, uint64_t addr_min,
                       uint64_t addr_max, uint64_t addr_trans,
                       uint64_t len);
+Aml *aml_dma(AmlDmaType typ, AmlDmaBusMaster bm, AmlTransferSize sz,
+             uint8_t channel);
 Aml *aml_sleep(uint64_t msec);
 
 /* Block AML object primitives */