OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h

   1 /** @file
   2   Macros for accessing QEMU's CPU hotplug register block.
   3
   4   Copyright (C) 2019, Red Hat, Inc.
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8   @par Specification Reference:
   9
  10   - "docs/specs/acpi_cpu_hotplug.txt" in the QEMU source tree.
  11
  12     The original (now "legacy") CPU hotplug interface appeared in QEMU v1.5.0.
  13     The new ("modern") hotplug interface appeared in QEMU v2.7.0.
  14
  15     The macros in this header file map to the minimal subset of the modern
  16     interface that OVMF needs.
  17 **/
  18
  19 #ifndef QEMU_CPU_HOTPLUG_H_
  20 #define QEMU_CPU_HOTPLUG_H_
  21
  22 #include <Base.h>
  23
  24 //
  25 // Each register offset is:
  26 // - relative to the board-dependent IO base address of the register block,
  27 // - named QEMU_CPUHP_(R|W|RW)_*, according to the possible access modes of the
  28 //   register,
  29 // - followed by distinguished bitmasks or values in the register.
  30 //
  31 #define QEMU_CPUHP_R_CMD_DATA2               0x0
  32
  33 #define QEMU_CPUHP_R_CPU_STAT                0x4
  34 #define QEMU_CPUHP_STAT_ENABLED                BIT0
  35
  36 #define QEMU_CPUHP_RW_CMD_DATA               0x8
  37
  38 #define QEMU_CPUHP_W_CPU_SEL                 0x0
  39
  40 #define QEMU_CPUHP_W_CMD                     0x5
  41 #define QEMU_CPUHP_CMD_GET_PENDING             0x0
  42 #define QEMU_CPUHP_CMD_GET_ARCH_ID             0x3
  43
  44 #endif // QEMU_CPU_HOTPLUG_H_