b75d1de536
In v1.5.0, QEMU's "pc" (i440fx) board gained a "CPU present bitmap" register block. In v2.0.0, this was extended to the "q35" board. In v2.7.0, a new (read/write) register interface was laid over the "CPU present bitmap", with an option for the guest to switch the register block to the new (a.k.a. modern) interface. Both interfaces are documented in "docs/specs/acpi_cpu_hotplug.txt" in the QEMU tree. Add macros for a minimal subset of the modern interface, just so we can count the possible CPUs (as opposed to boot CPUs) in a later patch in this series. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1515 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20191022221554.14963-3-lersek@redhat.com> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/** @file
|
|
Macros for accessing QEMU's CPU hotplug register block.
|
|
|
|
Copyright (C) 2019, Red Hat, Inc.
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
@par Specification Reference:
|
|
|
|
- "docs/specs/acpi_cpu_hotplug.txt" in the QEMU source tree.
|
|
|
|
The original (now "legacy") CPU hotplug interface appeared in QEMU v1.5.0.
|
|
The new ("modern") hotplug interface appeared in QEMU v2.7.0.
|
|
|
|
The macros in this header file map to the minimal subset of the modern
|
|
interface that OVMF needs.
|
|
**/
|
|
|
|
#ifndef QEMU_CPU_HOTPLUG_H_
|
|
#define QEMU_CPU_HOTPLUG_H_
|
|
|
|
#include <Base.h>
|
|
|
|
//
|
|
// Each register offset is:
|
|
// - relative to the board-dependent IO base address of the register block,
|
|
// - named QEMU_CPUHP_(R|W|RW)_*, according to the possible access modes of the
|
|
// register,
|
|
// - followed by distinguished bitmasks or values in the register.
|
|
//
|
|
#define QEMU_CPUHP_R_CMD_DATA2 0x0
|
|
|
|
#define QEMU_CPUHP_R_CPU_STAT 0x4
|
|
#define QEMU_CPUHP_STAT_ENABLED BIT0
|
|
|
|
#define QEMU_CPUHP_RW_CMD_DATA 0x8
|
|
|
|
#define QEMU_CPUHP_W_CPU_SEL 0x0
|
|
|
|
#define QEMU_CPUHP_W_CMD 0x5
|
|
#define QEMU_CPUHP_CMD_GET_PENDING 0x0
|
|
|
|
#endif // QEMU_CPU_HOTPLUG_H_
|