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[PATCH for-6.2] hw/arm/virt_acpi_build: Generate DBG2 table
From: |
Eric Auger |
Subject: |
[PATCH for-6.2] hw/arm/virt_acpi_build: Generate DBG2 table |
Date: |
Tue, 10 Aug 2021 10:30:57 +0200 |
ARM SBBR specification mandates DBG2 table (Debug Port Table 2).
this latter allows to describe one or more debug ports.
Generate an DBG2 table featuring a single debug port, the PL011.
The DBG2 specification can be found at:
https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/acpi-debug-port-table?redirectedfrom=MSDN
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
Tested by comparing the content with the table generated
by EDK2 along with the SBSA-REF machine (code generated by
DynamicTablesPkg/Library/Acpi/Arm/AcpiDbg2LibArm/Dbg2Generator.c).
I reused the Generic Address Structure filled by QEMU in the SPCR, ie.
bit_width = 8 and byte access. While EDK2 sets bit_width = 32 and
dword access. Also the name exposed by acpica tools is different:
'COM0' in my case where '\_SB.COM0' in SBSA-REF case?
---
hw/arm/virt-acpi-build.c | 77 ++++++++++++++++++++++++++++++++++++-
include/hw/acpi/acpi-defs.h | 50 ++++++++++++++++++++++++
2 files changed, 126 insertions(+), 1 deletion(-)
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 037cc1fd82..35f27b41df 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -563,6 +563,78 @@ build_gtdt(GArray *table_data, BIOSLinker *linker,
VirtMachineState *vms)
vms->oem_table_id);
}
+#define ACPI_DBG2_PL011_UART_LENGTH 0x1000
+
+/* DBG2 */
+static void
+build_dbg2(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
+{
+ int addr_offset, addrsize_offset, namespace_offset, namespace_length;
+ const MemMapEntry *uart_memmap = &vms->memmap[VIRT_UART];
+ struct AcpiGenericAddress *base_address;
+ int dbg2_start = table_data->len;
+ AcpiDbg2Device *dbg2dev;
+ char name[] = "COM0";
+ AcpiDbg2Table *dbg2;
+ uint32_t *addr_size;
+ uint8_t *namespace;
+
+ dbg2 = acpi_data_push(table_data, sizeof *dbg2);
+ dbg2->info_offset = sizeof *dbg2;
+ dbg2->info_count = 1;
+
+ /* debug device info structure */
+
+ dbg2dev = acpi_data_push(table_data, sizeof(AcpiDbg2Device));
+
+ dbg2dev->revision = 0;
+ namespace_length = sizeof name;
+ dbg2dev->length = sizeof *dbg2dev + sizeof(struct AcpiGenericAddress) +
+ 4 + namespace_length;
+ dbg2dev->register_count = 1;
+
+ addr_offset = sizeof *dbg2dev;
+ addrsize_offset = addr_offset + sizeof(struct AcpiGenericAddress);
+ namespace_offset = addrsize_offset + 4;
+
+ dbg2dev->namepath_length = cpu_to_le16(namespace_length);
+ dbg2dev->namepath_offset = cpu_to_le16(namespace_offset);
+ dbg2dev->oem_data_length = cpu_to_le16(0);
+ dbg2dev->oem_data_offset = cpu_to_le16(0); /* No OEM data is present */
+ dbg2dev->port_type = cpu_to_le16(ACPI_DBG2_SERIAL_PORT);
+ dbg2dev->port_subtype = cpu_to_le16(ACPI_DBG2_ARM_PL011);
+
+ dbg2dev->base_address_offset = cpu_to_le16(addr_offset);
+ dbg2dev->address_size_offset = cpu_to_le16(addrsize_offset);
+
+ /*
+ * variable length content:
+ * BaseAddressRegister[1]
+ * AddressSize[1]
+ * NamespaceString[1]
+ */
+
+ base_address = acpi_data_push(table_data,
+ sizeof(struct AcpiGenericAddress));
+
+ base_address->space_id = AML_SYSTEM_MEMORY;
+ base_address->bit_width = 8;
+ base_address->bit_offset = 0;
+ base_address->access_width = 1;
+ base_address->address = cpu_to_le64(uart_memmap->base);
+
+ addr_size = acpi_data_push(table_data, sizeof *addr_size);
+ *addr_size = cpu_to_le32(ACPI_DBG2_PL011_UART_LENGTH);
+
+ namespace = acpi_data_push(table_data, namespace_length);
+ memcpy(namespace, name, namespace_length);
+
+ build_header(linker, table_data,
+ (void *)(table_data->data + dbg2_start), "DBG2",
+ table_data->len - dbg2_start, 3, vms->oem_id,
+ vms->oem_table_id);
+}
+
/* MADT */
static void
build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
@@ -790,7 +862,7 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables
*tables)
dsdt = tables_blob->len;
build_dsdt(tables_blob, tables->linker, vms);
- /* FADT MADT GTDT MCFG SPCR pointed to by RSDT */
+ /* FADT MADT GTDT MCFG SPCR DBG2 pointed to by RSDT */
acpi_add_table(table_offsets, tables_blob);
build_fadt_rev5(tables_blob, tables->linker, vms, dsdt);
@@ -813,6 +885,9 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables
*tables)
acpi_add_table(table_offsets, tables_blob);
build_spcr(tables_blob, tables->linker, vms);
+ acpi_add_table(table_offsets, tables_blob);
+ build_dbg2(tables_blob, tables->linker, vms);
+
if (vms->ras) {
build_ghes_error_table(tables->hardware_errors, tables->linker);
acpi_add_table(table_offsets, tables_blob);
diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index cf9f44299c..bdb2ebed2c 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -618,4 +618,54 @@ struct AcpiIortRC {
} QEMU_PACKED;
typedef struct AcpiIortRC AcpiIortRC;
+/* DBG2 */
+
+/* Types for port_type field above */
+
+#define ACPI_DBG2_SERIAL_PORT 0x8000
+#define ACPI_DBG2_1394_PORT 0x8001
+#define ACPI_DBG2_USB_PORT 0x8002
+#define ACPI_DBG2_NET_PORT 0x8003
+
+/* Subtypes for port_subtype field above */
+
+#define ACPI_DBG2_16550_COMPATIBLE 0x0000
+#define ACPI_DBG2_16550_SUBSET 0x0001
+#define ACPI_DBG2_ARM_PL011 0x0003
+#define ACPI_DBG2_ARM_SBSA_32BIT 0x000D
+#define ACPI_DBG2_ARM_SBSA_GENERIC 0x000E
+#define ACPI_DBG2_ARM_DCC 0x000F
+#define ACPI_DBG2_BCM2835 0x0010
+
+#define ACPI_DBG2_1394_STANDARD 0x0000
+
+#define ACPI_DBG2_USB_XHCI 0x0000
+#define ACPI_DBG2_USB_EHCI 0x0001
+
+/* Debug Device Information Subtable */
+
+struct AcpiDbg2Device {
+ uint8_t revision;
+ uint16_t length;
+ uint8_t register_count; /* Number of base_address registers */
+ uint16_t namepath_length;
+ uint16_t namepath_offset;
+ uint16_t oem_data_length;
+ uint16_t oem_data_offset;
+ uint16_t port_type;
+ uint16_t port_subtype;
+ uint8_t reserved[2];
+ uint16_t base_address_offset;
+ uint16_t address_size_offset;
+} QEMU_PACKED;
+typedef struct AcpiDbg2Device AcpiDbg2Device;
+
+struct AcpiDbg2Table {
+ ACPI_TABLE_HEADER_DEF /* ACPI common table header */
+ uint32_t info_offset; /* offset to the first debug struct */
+ uint32_t info_count; /* number of debug device info struct entries */
+ uint8_t dbg2_device_info[];
+} QEMU_PACKED;
+typedef struct AcpiDbg2Table AcpiDbg2Table;
+
#endif
--
2.26.3
- [PATCH for-6.2] hw/arm/virt_acpi_build: Generate DBG2 table,
Eric Auger <=
Re: [PATCH for-6.2] hw/arm/virt_acpi_build: Generate DBG2 table, Igor Mammedov, 2021/08/10