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Save processor state during kernel initialization

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This commit is contained in:
Rafal Kupiec
2023-11-15 15:00:38 +01:00
parent ccd0514416
commit d35dd4fce3
6 changed files with 99 additions and 0 deletions
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38
xtoskrnl/ke/i686/proc.c
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@@ -51,3 +51,41 @@ KeGetCurrentThread(VOID)
{
return (PKTHREAD)ArReadFSDualWord(FIELD_OFFSET(KPROCESSOR_BLOCK, Prcb.CurrentThread));
}
/**
* Saves the current processor state.
*
* @param State
* Supplies a pointer to the processor state structure.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
KepSaveProcessorState(OUT PKPROCESSOR_STATE CpuState)
{
/* Save CR registers */
CpuState->SpecialRegisters.Cr0 = ArReadControlRegister(0);
CpuState->SpecialRegisters.Cr2 = ArReadControlRegister(2);
CpuState->SpecialRegisters.Cr3 = ArReadControlRegister(3);
CpuState->SpecialRegisters.Cr4 = ArReadControlRegister(4);
/* Save DR registers */
CpuState->SpecialRegisters.KernelDr0 = ArReadDebugRegister(0);
CpuState->SpecialRegisters.KernelDr1 = ArReadDebugRegister(1);
CpuState->SpecialRegisters.KernelDr2 = ArReadDebugRegister(2);
CpuState->SpecialRegisters.KernelDr3 = ArReadDebugRegister(3);
CpuState->SpecialRegisters.KernelDr6 = ArReadDebugRegister(6);
CpuState->SpecialRegisters.KernelDr7 = ArReadDebugRegister(7);
/* Save XMM control/status register */
CpuState->SpecialRegisters.MxCsr = ArReadMxCsrRegister();
/* Save GDT, IDT, LDT and TaskRegister */
ArStoreGlobalDescriptorTable(&CpuState->SpecialRegisters.Gdtr.Limit);
ArStoreInterruptDescriptorTable(&CpuState->SpecialRegisters.Idtr.Limit);
ArStoreLocalDescriptorTable(&CpuState->SpecialRegisters.Ldtr);
ArStoreTaskRegister(&CpuState->SpecialRegisters.Tr);
}