Enrico Fraccaroli
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/// MentOS, The Mentoring Operating system project
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/// @file kernel.h
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/// @brief Kernel generic data structure and functions.
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#pragma once
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#include "stdint.h"
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/// @brief The initial stack pointer.
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extern uintptr_t initial_esp;
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/// Kilobytes.
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#define K 1024
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/// Megabytes.
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#define M (1024 * K)
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/// Gigabytes.
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#define G (1024 * M)
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/// @brief Interrupt stack frame.
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/// @details
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/// When the CPU moves from Ring3 to Ring0 because of an interrupt,
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/// the following registes/values are moved into the kernel's stack
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typedef struct pt_regs {
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/// FS and GS have no hardware-assigned uses.
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uint32_t gs;
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/// FS and GS have no hardware-assigned uses.
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uint32_t fs;
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/// Extra Segment determined by the programmer.
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uint32_t es;
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/// Data Segment.
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uint32_t ds;
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/// 32-bit destination register.
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uint32_t edi;
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/// 32-bit source register.
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uint32_t esi;
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/// 32-bit base pointer register.
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uint32_t ebp;
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/// 32-bit stack pointer register.
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uint32_t esp;
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/// 32-bit base register.
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uint32_t ebx;
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/// 32-bit data register.
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uint32_t edx;
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/// 32-bit counter.
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uint32_t ecx;
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/// 32-bit accumulator register.
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uint32_t eax;
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/// Interrupt number.
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uint32_t int_no;
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/// Error code.
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uint32_t err_code;
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/// Instruction Pointer Register.
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uint32_t eip;
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/// Code Segment.
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uint32_t cs;
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/// 32-bit flag register.
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uint32_t eflags;
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/// User application ESP.
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uint32_t useresp;
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/// Stack Segment.
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uint32_t ss;
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} pt_regs;
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