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/**
* Copyright (c) 2026 Alexey Gavrilov <alexey.gavrilov@mail.com>
*
* This file is part of ObjectiveOS.
*
* ObjectiveOS is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* ObjectiveOS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* ObjectiveOS. If not, see <https://www.gnu.org/licenses/>.
*/
// Tasks:
// 1) Implement msr write and save functions
// 2) Ia32ApicBase field
#include <MemoryOperations.h>
#ifndef MSR_H
#define MSR_H
// defines for Ia32ApicBase
#define BSP_FLAG 0x100
#define APIC_ENABLE_FLAG 0x800
#define BASE_FIELD_MASK_LOW 0xfffff000
#define UINT64_HIGH 0xffffffff00000000
//------------------------
class MsrCommand
{
public:
virtual uint32 getCommand() = 0;
virtual void decode(uint64 rdmsrResult) = 0;
virtual uint64 getMsr() = 0;
};
class Ia32ApicBase : public MsrCommand
{
private:
// Get through Cpuinfo instance
uint8 maxPhyAddr;
bool bspFlag, enableFlag;
uint64 baseField;
public:
Ia32ApicBase();
virtual uint32 getCommand() override final;
virtual void decode(uint64 rdmrResult) override final;
virtual uint64 getMsr() override final;
void setBspFlag(bool flag);
void setEnableFlag(bool flag);
void setBaseField(uint64 fieldAddr);
};
class Msr
{
private:
bool msrSupport;
public:
Msr();
// Return true if MSR not supported (CPUID.01H:EDX[5] = 0)
bool rdmsr(MsrCommand *cmd);
// Return value same as rdmsr method
bool wrmsr(MsrCommand *cmd);
};
#endif
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