[edk2-devel] [PATCH edk2-platforms 5/7] SbsaQemu: AcpiDxe: Create SSDT table at runtime
Tanmay Jagdale
tanmay.jagdale at linaro.org
Wed Aug 19 14:30:03 UTC 2020
- Add support to create SSDT table at runtime. Since SSDT
table is a data table, added a few helper macros to create
the AML entries.
- Also added a function to calculate the length of Packages.
Signed-off-by: Tanmay Jagdale <tanmay.jagdale at linaro.org>
---
.../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c | 144 ++++++++++++++++++
.../Include/IndustryStandard/SbsaQemuAcpi.h | 29 ++++
2 files changed, 173 insertions(+)
diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
index 569cda8b6474..d90ce0c2a718 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
@@ -9,6 +9,7 @@
#include <IndustryStandard/Acpi.h>
#include <IndustryStandard/Acpi10.h>
#include <IndustryStandard/Acpi60.h>
+#include <IndustryStandard/AcpiAml.h>
#include <IndustryStandard/SbsaQemuAcpi.h>
#include <Library/AcpiLib.h>
#include <Library/BaseMemoryLib.h>
@@ -202,6 +203,144 @@ AddMadtTable (
return Status;
}
+/*
+ * Function to calculate the PkgLength field in ACPI tables
+ */
+STATIC
+UINT32
+SetPkgLength (
+ IN UINT8 *TablePtr,
+ IN UINT32 Length
+)
+{
+ UINT8 ByteCount;
+ UINT8 *PkgLeadByte = TablePtr;
+
+ if (Length < 64) {
+ *TablePtr = Length;
+ return 1;
+ }
+
+ // Set the LSB of Length in PkgLeadByte and advance Length
+ *PkgLeadByte = Length & 0xF;
+ Length = Length >> 4;
+
+ while (Length) {
+ TablePtr++;
+ *TablePtr = (Length & 0xFF);
+ Length = (Length >> 8);
+ }
+
+ // Calculate the number of bytes the Length field uses
+ // and set the ByteCount field in PkgLeadByte.
+ ByteCount = (TablePtr - PkgLeadByte) & 0xF;
+ *PkgLeadByte |= (ByteCount << 6);
+
+ return ByteCount + 1;
+}
+
+/*
+ * A function that adds SSDT ACPI table.
+ */
+EFI_STATUS
+AddSsdtTable (
+ IN EFI_ACPI_TABLE_PROTOCOL *AcpiTable
+ )
+{
+ EFI_STATUS Status;
+ UINTN TableHandle;
+ UINT32 TableSize;
+ EFI_PHYSICAL_ADDRESS PageAddress;
+ UINT8 *New;
+ UINT32 CpuId;
+ UINT32 Offset;
+ UINT8 ScopeOpName[] = SBSAQEMU_ACPI_SCOPE_NAME;
+ UINT32 NumCores = PcdGet32 (PcdCoreCount);
+
+ EFI_ACPI_DESCRIPTION_HEADER Header =
+ SBSAQEMU_ACPI_HEADER (
+ EFI_ACPI_6_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_SIGNATURE,
+ EFI_ACPI_DESCRIPTION_HEADER,
+ EFI_ACPI_6_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_REVISION);
+
+ SBSAQEMU_ACPI_CPU_DEVICE CpuDevice = {
+ { AML_EXT_OP, AML_EXT_DEVICE_OP }, /* Device () */
+ SBSAQEMU_ACPI_CPU_DEV_LEN, /* Length */
+ SBSAQEMU_ACPI_CPU_DEV_NAME, /* Device Name "C000" */
+ SBSAQEMU_ACPI_CPU_HID, /* Name (HID, "ACPI0007") */
+ SBSAQEMU_ACPI_CPU_UID, /* Name (UID, 0) */
+ };
+
+ // Calculate the new table size based on the number of cores
+ TableSize = sizeof (EFI_ACPI_DESCRIPTION_HEADER) +
+ SBSAQEMU_ACPI_SCOPE_OP_MAX_LENGTH + sizeof (ScopeOpName) +
+ (sizeof (CpuDevice) * NumCores);
+
+ Status = gBS->AllocatePages (
+ AllocateAnyPages,
+ EfiACPIReclaimMemory,
+ EFI_SIZE_TO_PAGES (TableSize),
+ &PageAddress
+ );
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Failed to allocate pages for SSDT table\n"));
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ New = (UINT8 *)(UINTN) PageAddress;
+ ZeroMem (New, TableSize);
+
+ // Add the ACPI Description table header
+ CopyMem (New, &Header, sizeof (EFI_ACPI_DESCRIPTION_HEADER));
+ ((EFI_ACPI_DESCRIPTION_HEADER*) New)->Length = TableSize;
+ New += sizeof (EFI_ACPI_DESCRIPTION_HEADER);
+
+ // Insert the top level ScopeOp
+ *New = AML_SCOPE_OP;
+ New++;
+ Offset = SetPkgLength (New,
+ (TableSize - sizeof (EFI_ACPI_DESCRIPTION_HEADER) - 1));
+ New += Offset;
+ CopyMem (New, &ScopeOpName, sizeof (ScopeOpName));
+ New += sizeof (ScopeOpName);
+
+ // Add new Device structures for the Cores
+ for (CpuId = 0; CpuId < NumCores; CpuId++) {
+ SBSAQEMU_ACPI_CPU_DEVICE *CpuDevicePtr;
+ UINT8 CpuIdByte1, CpuIdByte2, CpuIdByte3;
+
+ CopyMem (New, &CpuDevice, sizeof (SBSAQEMU_ACPI_CPU_DEVICE));
+ CpuDevicePtr = (SBSAQEMU_ACPI_CPU_DEVICE *) New;
+
+ CpuIdByte1 = CpuId & 0xF;
+ CpuIdByte2 = (CpuId >> 4) & 0xF;
+ CpuIdByte3 = (CpuId >> 8) & 0xF;
+
+ CpuDevicePtr->dev_name[1] = SBSAQEMU_ACPI_ITOA(CpuIdByte3);
+ CpuDevicePtr->dev_name[2] = SBSAQEMU_ACPI_ITOA(CpuIdByte2);
+ CpuDevicePtr->dev_name[3] = SBSAQEMU_ACPI_ITOA(CpuIdByte1);
+
+ CpuDevicePtr->uid[6] = CpuIdByte1 | CpuIdByte2;
+ CpuDevicePtr->uid[7] = CpuIdByte3;
+ New += sizeof (SBSAQEMU_ACPI_CPU_DEVICE);
+ }
+
+ // Perform Checksum
+ AcpiPlatformChecksum ((UINT8*) PageAddress, TableSize);
+
+ Status = AcpiTable->InstallAcpiTable (
+ AcpiTable,
+ (EFI_ACPI_COMMON_HEADER *)PageAddress,
+ TableSize,
+ &TableHandle
+ );
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Failed to install SSDT table\n"));
+ }
+
+ return Status;
+}
+
EFI_STATUS
EFIAPI
InitializeSbsaQemuAcpiDxe (
@@ -231,5 +370,10 @@ InitializeSbsaQemuAcpiDxe (
DEBUG((EFI_D_ERROR, "Failed to add MADT table\n"));
}
+ Status = AddSsdtTable (AcpiTable);
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Failed to add SSDT table\n"));
+ }
+
return EFI_SUCCESS;
}
diff --git a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuAcpi.h b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuAcpi.h
index 7a9a0061675f..60acc083ddbb 100644
--- a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuAcpi.h
+++ b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuAcpi.h
@@ -43,4 +43,33 @@
#define SBSAQEMU_PCI_SEG0_BUSNUM_MIN 0x00
#define SBSAQEMU_PCI_SEG0_BUSNUM_MAX 0xFF
+#define SBSAQEMU_ACPI_SCOPE_OP_MAX_LENGTH 5
+
+#define SBSAQEMU_ACPI_SCOPE_NAME { '_', 'S', 'B', '_' }
+
+#define SBSAQEMU_ACPI_CPU_DEV_LEN 0x1C
+#define SBSAQEMU_ACPI_CPU_DEV_NAME { 'C', '0', '0', '0' }
+
+// Macro to convert Integer to Character
+#define SBSAQEMU_ACPI_ITOA(Byte) (0x30 + (Byte > 9 ? (Byte + 1) : Byte))
+
+#define SBSAQEMU_ACPI_CPU_HID { \
+ AML_NAME_OP, AML_NAME_CHAR__, 'H', 'I', 'D', \
+ AML_STRING_PREFIX, 'A', 'C', 'P', 'I', '0', '0', '0', '7', \
+ AML_ZERO_OP \
+ }
+
+#define SBSAQEMU_ACPI_CPU_UID { \
+ AML_NAME_OP, AML_NAME_CHAR__, 'U', 'I', 'D', AML_BYTE_PREFIX, \
+ AML_ZERO_OP, AML_ZERO_OP \
+ }
+
+typedef struct {
+ UINT8 device_header[2];
+ UINT8 length;
+ UINT8 dev_name[4];
+ UINT8 hid[15];
+ UINT8 uid[8];
+} SBSAQEMU_ACPI_CPU_DEVICE;
+
#endif
--
2.28.0
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