lordtet
7b4e4afd43
Didn't feel the need to make a new branch for this one, but i added some doxygen documentation templates to all of the headers. It's a bit overdue.
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/**
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* @file tss.h
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* @brief Task State Segment (TSS) definitions and structures
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* @author Jake Holtham
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* @date 2025
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*
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* This header file contains the structure definitions for the x86 Task State Segment (TSS).
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*/
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#ifndef TSS_H
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#define TSS_H
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#include <stdint.h>
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/**
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* @brief Task State Segment structure
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*
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* Data structure that contains information about a task,
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* including the state of the processor registers, stack pointers, and other task-specific
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* information. It is used by the x86 architecture for task switching and interrupt handling.
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*
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* Packed to make sure it's aligned and the correct size.
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*
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* @note This structure must be aligned on a 4byte boundary
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*/
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typedef struct tss_s {
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uint32_t LINK; /**< Previous TSS selector*/
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uint32_t ESP0; /**< Stack pointer for privilege level0*/
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uint32_t SS0; /**< Stack segment for privilege level0*/
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uint32_t ESP1; /**< Stack pointer for privilege level1*/
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uint32_t SS1; /**< Stack segment for privilege level1*/
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uint32_t ESP2; /**< Stack pointer for privilege level2*/
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uint32_t SS2; /**< Stack segment for privilege level2*/
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uint32_t CR3; /**< Page Directory register */
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uint32_t EIP; /**< Instruction pointer */
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uint32_t EFLAGS; /**< Flags register */
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uint32_t EAX; /**< General purpose */
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uint32_t ECX; /**< General purpose */
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uint32_t EDX; /**< General purpose */
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uint32_t EBX; /**< General purpose */
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uint32_t ESP; /**< Stack pointer */
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uint32_t ESI; /**< Source index register */
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uint32_t EDI; /**< Destination index register */
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uint32_t ES; /**< Extra segment register */
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uint32_t CS; /**< Code segment register */
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uint32_t SS; /**< Stack segment register */
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uint32_t DS; /**< Data segment register */
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uint32_t FS; /**< Extra segment register FS */
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uint32_t GS; /**< Extra segment register GS */
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uint32_t LDTR; /**< Local descriptor table register */
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uint32_t IOPB; /**< I/O permission bitmap offset */
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uint32_t SSP; /**< Stack segment pointer */
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} __attribute__((packed)) tss_t;
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/**
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* @brief Global TSS instance
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*
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* This is the main TSS instance used by the kernel for task management.
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* It contains the current task's state information.
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* Defined in assembly.
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*/
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extern tss_t tss;
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#endif /* TSS_H */
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