763840c9ab
Add a function that collects the APIC IDs of CPUs that have just been hot-plugged, or are about to be hot-unplugged. Pending events are only located and never cleared; QEMU's AML needs the firmware to leave the status bits intact in the hotplug register block. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20200226221156.29589-10-lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/** @file
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Simple wrapper functions and utility functions that access QEMU's modern CPU
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hotplug register block.
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These functions manipulate some of the registers described in
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"docs/specs/acpi_cpu_hotplug.txt" in the QEMU source. IO Ports are accessed
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via EFI_MM_CPU_IO_PROTOCOL. If a protocol call fails, these functions don't
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return.
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Copyright (c) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef QEMU_CPUHP_H_
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#define QEMU_CPUHP_H_
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#include <Protocol/MmCpuIo.h> // EFI_MM_CPU_IO_PROTOCOL
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#include <Uefi/UefiBaseType.h> // EFI_STATUS
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#include "ApicId.h" // APIC_ID
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UINT32
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QemuCpuhpReadCommandData2 (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
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);
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UINT8
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QemuCpuhpReadCpuStatus (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
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);
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UINT32
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QemuCpuhpReadCommandData (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
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);
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VOID
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QemuCpuhpWriteCpuSelector (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
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IN UINT32 Selector
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);
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VOID
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QemuCpuhpWriteCommand (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
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IN UINT8 Command
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);
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EFI_STATUS
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QemuCpuhpCollectApicIds (
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IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
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IN UINT32 PossibleCpuCount,
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IN UINT32 ApicIdCount,
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OUT APIC_ID *PluggedApicIds,
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OUT UINT32 *PluggedCount,
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OUT APIC_ID *ToUnplugApicIds,
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OUT UINT32 *ToUnplugCount
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);
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#endif // QEMU_CPUHP_H_
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