OvmfPkg/CpuHotplugSmm/QemuCpuhp.h

   1 /** @file
   2   Simple wrapper functions that access QEMU's modern CPU hotplug register
   3   block.
   4
   5   These functions thinly wrap some of the registers described in
   6   "docs/specs/acpi_cpu_hotplug.txt" in the QEMU source. IO Ports are accessed
   7   via EFI_MM_CPU_IO_PROTOCOL. If a protocol call fails, these functions don't
   8   return.
   9
  10   Copyright (c) 2020, Red Hat, Inc.
  11
  12   SPDX-License-Identifier: BSD-2-Clause-Patent
  13 **/
  14
  15 #ifndef QEMU_CPUHP_H_
  16 #define QEMU_CPUHP_H_
  17
  18 #include <Protocol/MmCpuIo.h>  // EFI_MM_CPU_IO_PROTOCOL
  19
  20 UINT32
  21 QemuCpuhpReadCommandData2 (
  22   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
  23   );
  24
  25 UINT8
  26 QemuCpuhpReadCpuStatus (
  27   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
  28   );
  29
  30 UINT32
  31 QemuCpuhpReadCommandData (
  32   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
  33   );
  34
  35 VOID
  36 QemuCpuhpWriteCpuSelector (
  37   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
  38   IN UINT32                       Selector
  39   );
  40
  41 VOID
  42 QemuCpuhpWriteCommand (
  43   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
  44   IN UINT8                        Command
  45   );
  46
  47 #endif // QEMU_CPUHP_H_