From: Ying Fang <fangyi...@huawei.com>
The generic register descriptor describes the localtion of a
fixed width register within any of the ACPI-defined address space.
This is needed to declare the ACPI CPPC registers.
Signed-off-by: Heyi Guo <guoh...@huawei.com>
Signed-off-by: Ying Fang <fangyi...@huawei.com>
---
hw/acpi/aml-build.c | 22 ++++++++++++++++++++++
include/hw/acpi/aml-build.h | 3 +++
2 files changed, 25 insertions(+)
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 2c3702b882..79b1431f07 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1370,6 +1370,28 @@ Aml *aml_sleep(uint64_t msec)
return var;
}
+/* ACPI 5.0b: 6.4.3.7 Generic Register Descriptor */
+Aml *aml_generic_register(AmlRegionSpace rs, uint8_t reg_width,
+ uint8_t reg_offset, AmlAccessType type, uint64_t
addr)
+{
+ int i;
+ Aml *var = aml_alloc();
+ build_append_byte(var->buf, 0x82); /* Generic Register Descriptor */
+ build_append_byte(var->buf, 0x0C); /* Length, bits[7:0] value = 0x0C */
+ build_append_byte(var->buf, 0); /* Length, bits[15:8] value = 0 */
+ build_append_byte(var->buf, rs); /* Address Space ID */
+ build_append_byte(var->buf, reg_width); /* Register Bit Width */
+ build_append_byte(var->buf, reg_offset); /* Register Bit Offset */
+ build_append_byte(var->buf, type); /* Access Size */
+
+ /* Register address */
+ for (i = 0; i < 8; i++) {
+ build_append_byte(var->buf, extract64(addr, i * 8, 8));
+ }
+
+ return var;
+}
+
static uint8_t Hex2Byte(const char *src)
{
int hi, lo;
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index de4a406568..37a047b156 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -364,6 +364,9 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed,
Aml *aml_dma(AmlDmaType typ, AmlDmaBusMaster bm, AmlTransferSize sz,
uint8_t channel);
Aml *aml_sleep(uint64_t msec);
+Aml *aml_generic_register(AmlRegionSpace rs, uint8_t reg_width,
+ uint8_t reg_offset, AmlAccessType type,
+ uint64_t addr);
Aml *aml_i2c_serial_bus_device(uint16_t address, const char *resource_source);
/* Block AML object primitives */
--
2.19.1
