100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: Task state segment
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* Author: Chloe M.
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*/
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#ifndef _MACHINE_TSS_H_
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#define _MACHINE_TSS_H_ 1
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#include <ptdef.h>
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/*
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* Represents used interrupt stack table indices
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*
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* @IST_RESERVED: This is not used
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* @IST_NMI: Stack for NMIs
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* @IST_SCHED: Stack for scheduler
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*/
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typedef enum {
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IST_RESERVED,
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IST_NMI,
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IST_SCHED
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} IST_INDEX;
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/*
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* Represents a platform task state segment
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*
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* Refer to section 8.7 of the Intel SDM
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*/
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typedef struct PACKED {
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ULONG Reserved;
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ULONG Rsp0Low;
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ULONG Rsp0High;
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ULONG Rsp1Low;
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ULONG Rsp1High;
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ULONG Rsp2Low;
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ULONG Rsp2High;
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ULONG Reserved1;
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ULONG Reserved2;
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ULONG Ist1Low;
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ULONG Ist1High;
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ULONG Ist2Low;
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ULONG Ist2High;
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ULONG Ist3Low;
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ULONG Ist3High;
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ULONG Ist4Low;
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ULONG Ist4High;
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ULONG Ist5Low;
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ULONG Ist5High;
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ULONG Ist6Low;
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ULONG Ist6High;
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ULONG Ist7Low;
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ULONG Ist7High;
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ULONG Reserved3;
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ULONG Reserved4;
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USHORT Reserved5;
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USHORT IoBitmap;
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} TSS_ENTRY;
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/*
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* Task state segment descriptor within GDT
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*
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* Refer to section 8.2.3 of the Intel SDM
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*/
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typedef struct PACKED {
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USHORT SegmentLimit;
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USHORT BaseLow16;
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UCHAR BaseMid8;
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UCHAR Type : 4;
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UCHAR Zero : 1;
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UCHAR Dpl : 2;
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UCHAR Present : 1;
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UCHAR SegLimitHigh : 4;
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UCHAR Avl : 1;
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UCHAR Unused : 2;
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UCHAR Gran : 1;
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UCHAR BaseHighMid8;
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ULONG BaseHigh32;
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ULONG Reserved;
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} TSS_DESCRIPTOR;
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/*
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* Allocate an interrupt stack table entry
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*
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* @IstIndex: Interrupt stack table index
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* @StackSize: Size of stack to allocate
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*/
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VOID MdTssAllocIst(UCHAR IstIndex, USIZE StackSize);
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/*
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* Initialize the task state segment
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*
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* @Descriptor: Task state segment desciptor
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*/
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VOID MdTssInit(TSS_DESCRIPTOR *Descriptor);
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#endif /* !_MACHINE_TSS_H_ */
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