1 files changed, 47 insertions, 0 deletions
diff --git a/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
new file mode 100644
index 0000000000..82f88f0b73
--- /dev/null
+++ b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
@@ -0,0 +1,47 @@
+/** @file
+  Simple wrapper functions that access QEMU's modern CPU hotplug register
+  block.
+
+  These functions thinly wrap some of the registers described in
+  "docs/specs/acpi_cpu_hotplug.txt" in the QEMU source. IO Ports are accessed
+  via EFI_MM_CPU_IO_PROTOCOL. If a protocol call fails, these functions don't
+  return.
+
+  Copyright (c) 2020, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef QEMU_CPUHP_H_
+#define QEMU_CPUHP_H_
+
+#include <Protocol/MmCpuIo.h>  // EFI_MM_CPU_IO_PROTOCOL
+
+UINT32
+QemuCpuhpReadCommandData2 (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
+  );
+
+UINT8
+QemuCpuhpReadCpuStatus (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
+  );
+
+UINT32
+QemuCpuhpReadCommandData (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
+  );
+
+VOID
+QemuCpuhpWriteCpuSelector (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
+  IN UINT32                       Selector
+  );
+
+VOID
+QemuCpuhpWriteCommand (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
+  IN UINT8                        Command
+  );
+
+#endif // QEMU_CPUHP_H_