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273 lines
8.0 KiB
C
273 lines
8.0 KiB
C
/**
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* @file process.h
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* @author longjin
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* @brief 进程
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* @date 2022-01-29
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*
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* @copyright Copyright (c) 2022
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*
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*/
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#pragma once
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#include "../common/cpu.h"
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#include "../common/glib.h"
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#include "../mm/mm.h"
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#include "ptrace.h"
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extern unsigned long _stack_start; // 导出内核层栈基地址（定义在head.S）
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extern void ret_from_intr(); // 导出从中断返回的函数（定义在entry.S）
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// 进程的内核栈大小 32K
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#define STACK_SIZE 32768
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// 进程的运行状态
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// 正在运行
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#define PROC_RUNNING (1 << 0)
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// 可被中断
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#define PROC_INTERRUPTIBLE (1 << 1)
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// 不可被中断
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#define PROC_UNINTERRUPTIBLE (1 << 2)
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// 挂起
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#define PROC_ZOMBIE (1 << 3)
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// 已停止
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#define PROC_STOPPED (1 << 4)
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// 内核代码段基地址
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#define KERNEL_CS (0x08)
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// 内核数据段基地址
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#define KERNEL_DS (0x10)
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// 用户代码段基地址
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#define USER_CS (0x28)
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// 用户数据段基地址
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#define USER_DS (0x30)
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// 进程初始化时的数据拷贝标志位
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#define CLONE_FS (1 << 0)
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#define CLONE_FILES (1 << 1)
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#define CLONE_SIGNAL (1 << 2)
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/**
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* @brief 内存空间分布结构体
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* 包含了进程内存空间分布的信息
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*/
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struct mm_struct
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{
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pml4t_t *pgd; // 内存页表指针
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// 代码段空间
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ul code_addr_start, code_addr_end;
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// 数据段空间
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ul data_addr_start, data_addr_end;
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// 只读数据段空间
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ul rodata_addr_start, rodata_addr_end;
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// 动态内存分配区（堆区域）
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ul brk_start, brk_end;
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// 应用层栈基地址
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ul stack_start;
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};
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struct thread_struct
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{
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// 内核层栈基指针
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ul rbp; // in tss rsp0
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// 内核层代码指针
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ul rip;
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// 内核层栈指针
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ul rsp;
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ul fs, gs;
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ul cr2;
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// 异常号
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ul trap_num;
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// 错误码
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ul err_code;
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};
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// 进程标志位
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#define PF_KTHREAD (1 << 0)
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/**
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* @brief 进程控制块
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*
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*/
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struct process_control_block
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{
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// 连接各个pcb的双向链表
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struct List list;
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// 进程的状态
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volatile long state;
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// 进程标志：进程、线程、内核线程
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unsigned long flags;
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// 内存空间分布结构体， 记录内存页表和程序段信息
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struct mm_struct *mm;
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// 进程切换时保存的状态信息
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struct thread_struct *thread;
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// 地址空间范围
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// 用户空间： 0x0000 0000 0000 0000 ~ 0x0000 7fff ffff ffff
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// 内核空间： 0xffff 8000 0000 0000 ~ 0xffff ffff ffff ffff
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ul addr_limit;
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// 进程id
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long pid;
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// 可用时间片
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long counter;
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// 信号
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long signal;
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// 优先级
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long priority;
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};
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// 将进程的pcb和内核栈融合到一起,8字节对齐
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union proc_union
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{
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struct process_control_block pcb;
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ul stack[STACK_SIZE / sizeof(ul)];
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} __attribute__((aligned(8)));
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struct mm_struct initial_mm;
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struct thread_struct initial_thread;
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// 设置初始进程的PCB
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#define INITIAL_PROC(proc) \
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{ \
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.state = PROC_UNINTERRUPTIBLE, \
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.flags = PF_KTHREAD, \
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.mm = &initial_mm, \
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.thread = &initial_thread, \
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.addr_limit = 0xffff800000000000, \
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.pid = 0, \
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.counter = 1, \
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.signal = 0, \
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.priority = 0 \
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}
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// 初始化 初始进程的union ，并将其链接到.data.init_proc段内
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union proc_union initial_proc_union __attribute__((__section__(".data.init_proc_union"))) = {INITIAL_PROC(initial_proc_union.pcb)};
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struct process_control_block *initial_proc[CPU_NUM] = {&initial_proc_union.pcb, 0};
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struct mm_struct initial_mm = {0};
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struct thread_struct initial_thread =
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{
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.rbp = (ul)(initial_proc_union.stack + STACK_SIZE / sizeof(ul)),
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.rsp = (ul)(initial_proc_union.stack + STACK_SIZE / sizeof(ul)),
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.fs = KERNEL_DS,
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.gs = KERNEL_DS,
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.cr2 = 0,
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.trap_num = 0,
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.err_code = 0};
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/**
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* @brief 任务状态段结构体
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*
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*/
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struct tss_struct
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{
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unsigned int reserved0;
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ul rsp0;
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ul rsp1;
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ul rsp2;
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ul reserved1;
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ul ist1;
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ul ist2;
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ul ist3;
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ul ist4;
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ul ist5;
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ul ist6;
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ul ist7;
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ul reserved2;
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unsigned short reserved3;
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// io位图基地址
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unsigned short io_map_base_addr;
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} __attribute__((packed)); // 使用packed表明是紧凑结构，编译器不会对成员变量进行字节对齐。
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// 设置初始进程的tss
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#define INITIAL_TSS \
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{ \
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.reserved0 = 0, \
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.rsp0 = (ul)(initial_proc_union.stack + STACK_SIZE / sizeof(ul)), \
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.rsp1 = (ul)(initial_proc_union.stack + STACK_SIZE / sizeof(ul)), \
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.rsp2 = (ul)(initial_proc_union.stack + STACK_SIZE / sizeof(ul)), \
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.reserved1 = 0, \
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.ist1 = 0xffff800000007c00, \
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.ist2 = 0xffff800000007c00, \
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.ist3 = 0xffff800000007c00, \
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.ist4 = 0xffff800000007c00, \
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.ist5 = 0xffff800000007c00, \
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.ist6 = 0xffff800000007c00, \
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.ist7 = 0xffff800000007c00, \
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.reserved2 = 0, \
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.reserved3 = 0, \
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.io_map_base_addr = 0 \
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}
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// 为每个核心初始化初始进程的tss
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struct tss_struct initial_tss[CPU_NUM] = {[0 ... CPU_NUM - 1] = INITIAL_TSS};
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// 获取当前的pcb
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struct process_control_block *get_current_pcb()
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{
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struct process_control_block *current = NULL;
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// 利用了当前pcb和栈空间总大小为32k大小对齐，将rsp低15位清空，即可获得pcb的起始地址
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__asm__ __volatile__("andq %%rsp, %0 \n\t"
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: "=r"(current)
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: "0"(~32767UL));
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return current;
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};
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#define current_pcb get_current_pcb()
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#define GET_CURRENT_PCB \
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"movq %rsp, %rbx \n\t" \
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"andq $-32768, %rbx\n\t"
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/**
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* @brief 切换进程上下文
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* 先把rbp和rax保存到栈中，然后将rsp和rip保存到prev的thread结构体中
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* 然后调用__switch_to切换栈，配置其他信息，最后恢复下一个进程的rax rbp。
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*/
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#define switch_proc(prev, next) \
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do \
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{ \
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\
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__asm__ __volatile__("pushq %%rbp \n\t" \
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"pushq %%rax \n\t" \
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"movq %%rsp, %0 \n\t" \
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"movq %2, %%rsp \n\t" \
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"leaq 1f(%%rip), %%rax \n\t" \
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"movq %%rax, %1 \n\t" \
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"pushq %3 \n\t" \
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"jmp __switch_to \n\t" \
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"1: \n\t" \
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"popq %%rax \n\t" \
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"popq %%rbp \n\t" \
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: "=m"(prev->thread->rsp), "=m"(prev->thread->rip) \
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: "m"(next->thread->rsp), "m"(next->thread->rip), "D"(prev), "S"(next) \
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: "memory"); \
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} while (0)
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/**
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* @brief 初始化系统的第一个进程
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*
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*/
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void process_init();
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/**
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* @brief fork当前进程
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*
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* @param regs 新的寄存器值
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* @param clone_flags 克隆标志
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* @param stack_start 堆栈开始地址
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* @param stack_size 堆栈大小
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* @return unsigned long
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*/
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unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned long stack_start, unsigned long stack_size); |