Enrico Fraccaroli (Galfurian)
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/// @file tss.h
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/// @brief Data structures concerning the Task State Segment (TSS).
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/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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/// @addtogroup descriptor_tables Descriptor Tables
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/// @{
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/// @defgroup tss Task State Segment (TSS)
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/// @brief Is a special structure on x86-based computers which holds information
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/// about a task. It is used by the operating system kernel for task management.
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/// @{
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#pragma once
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#include "stdint.h"
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/// @brief Task state segment entry.
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typedef struct tss_entry {
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uint32_t prev_tss; ///< If we used hardware task switching this would form a linked list.
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uint32_t esp0; ///< The stack pointer to load when we change to kernel mode.
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uint32_t ss0; ///< The stack segment to load when we change to kernel mode.
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uint32_t esp1; ///< everything below here is unusued now.
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uint32_t ss1; ///< TODO: Comment.
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uint32_t esp2; ///< TODO: Comment.
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uint32_t ss2; ///< TODO: Comment.
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uint32_t cr3; ///< TODO: Comment.
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uint32_t eip; ///< TODO: Comment.
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uint32_t eflags; ///< TODO: Comment.
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uint32_t eax; ///< TODO: Comment.
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uint32_t ecx; ///< TODO: Comment.
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uint32_t edx; ///< TODO: Comment.
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uint32_t ebx; ///< TODO: Comment.
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uint32_t esp; ///< TODO: Comment.
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uint32_t ebp; ///< TODO: Comment.
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uint32_t esi; ///< TODO: Comment.
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uint32_t edi; ///< TODO: Comment.
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uint32_t es; ///< TODO: Comment.
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uint32_t cs; ///< TODO: Comment.
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uint32_t ss; ///< TODO: Comment.
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uint32_t ds; ///< TODO: Comment.
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uint32_t fs; ///< TODO: Comment.
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uint32_t gs; ///< TODO: Comment.
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uint32_t ldt; ///< TODO: Comment.
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uint16_t trap; ///< TODO: Comment.
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uint16_t iomap; ///< TODO: Comment.
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} tss_entry_t;
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/// @brief Flushes the Task State Segment.
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extern void tss_flush();
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/// @brief We don't need tss to assist task switching, but it's required to
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/// have one tss for switching back to kernel mode(system call for
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/// example).
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/// @param idx Index.
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/// @param ss0 Kernel data segment.
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void tss_init(uint8_t idx, uint32_t ss0);
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/// @brief This function is used to set the esp the kernel should be using.
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/// @param kss Kernel data segment.
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/// @param kesp Kernel stack address.
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void tss_set_stack(uint32_t kss, uint32_t kesp);
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/// @}
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/// @}
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