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/** @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
**/
#include <IndustryStandard/Q35MchIch9.h> // ICH9_CPU_HOTPLUG_BASE
#include <IndustryStandard/QemuCpuHotplug.h> // QEMU_CPUHP_R_CMD_DATA2
#include <Library/BaseLib.h> // CpuDeadLoop()
#include <Library/DebugLib.h> // DEBUG()
#include "QemuCpuhp.h"
UINT32
QemuCpuhpReadCommandData2 (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
)
{
UINT32 CommandData2;
EFI_STATUS Status;
CommandData2 = 0;
Status = MmCpuIo->Io.Read (
MmCpuIo,
MM_IO_UINT32,
ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_R_CMD_DATA2,
1,
&CommandData2
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
return CommandData2;
}
UINT8
QemuCpuhpReadCpuStatus (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
)
{
UINT8 CpuStatus;
EFI_STATUS Status;
CpuStatus = 0;
Status = MmCpuIo->Io.Read (
MmCpuIo,
MM_IO_UINT8,
ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_R_CPU_STAT,
1,
&CpuStatus
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
return CpuStatus;
}
UINT32
QemuCpuhpReadCommandData (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo
)
{
UINT32 CommandData;
EFI_STATUS Status;
CommandData = 0;
Status = MmCpuIo->Io.Read (
MmCpuIo,
MM_IO_UINT32,
ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_RW_CMD_DATA,
1,
&CommandData
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
return CommandData;
}
VOID
QemuCpuhpWriteCpuSelector (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
IN UINT32 Selector
)
{
EFI_STATUS Status;
Status = MmCpuIo->Io.Write (
MmCpuIo,
MM_IO_UINT32,
ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_W_CPU_SEL,
1,
&Selector
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
}
VOID
QemuCpuhpWriteCommand (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
IN UINT8 Command
)
{
EFI_STATUS Status;
Status = MmCpuIo->Io.Write (
MmCpuIo,
MM_IO_UINT8,
ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_W_CMD,
1,
&Command
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
}
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