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223 lines
7.1 KiB
C
223 lines
7.1 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 <syscall/syscall.h>
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#include "ptrace.h"
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#include <common/errno.h>
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#include <filesystem/VFS/VFS.h>
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#include <common/wait_queue.h>
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#include <mm/mm-types.h>
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#if ARCH(I386) || ARCH(X86_64)
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#include <arch/x86_64/current.h>
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#else
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#error Unsupported architecture!
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#endif
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#include "proc-types.h"
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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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.preempt_count = 0, \
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.signal = 0, \
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.cpu_id = 0, \
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.mm = &initial_mm, \
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.thread = &initial_thread, \
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.addr_limit = 0xffffffffffffffff, \
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.pid = 0, \
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.priority = 2, \
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.virtual_runtime = 0, \
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.fds = {0}, \
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.next_pcb = &proc, \
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.parent_pcb = &proc, \
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.exit_code = 0, \
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.wait_child_proc_exit = 0 \
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}
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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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// 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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#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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__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 switch_proc_ret_addr(%%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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"switch_proc_ret_addr: \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);
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/**
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* @brief 根据pid获取进程的pcb
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*
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* @param pid
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* @return struct process_control_block*
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*/
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struct process_control_block *process_get_pcb(long pid);
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/**
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* @brief 将进程加入到调度器的就绪队列中
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*
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* @param pcb 进程的pcb
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*/
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int process_wakeup(struct process_control_block *pcb);
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/**
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* @brief 将进程加入到调度器的就绪队列中，并标志当前进程需要被调度
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*
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* @param pcb 进程的pcb
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*/
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int process_wakeup_immediately(struct process_control_block *pcb);
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/**
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* @brief 使当前进程去执行新的代码
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*
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* @param regs 当前进程的寄存器
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* @param path 可执行程序的路径
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* @param argv 参数列表
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* @param envp 环境变量
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* @return ul 错误码
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*/
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ul do_execve(struct pt_regs *regs, char *path, char *argv[], char *envp[]);
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/**
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* @brief 释放进程的页表
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*
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* @param pcb 要被释放页表的进程
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* @return uint64_t
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*/
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uint64_t process_exit_mm(struct process_control_block *pcb);
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/**
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* @brief 进程退出时执行的函数
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*
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* @param code 返回码
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* @return ul
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*/
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ul process_do_exit(ul code);
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/**
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* @brief 当子进程退出后向父进程发送通知
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*
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*/
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void process_exit_notify();
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/**
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* @brief 初始化内核进程
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*
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* @param fn 目标程序的地址
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* @param arg 向目标程序传入的参数
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* @param flags
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* @return int
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*/
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pid_t kernel_thread(int (*fn)(void*), void* arg, unsigned long flags);
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int process_fd_alloc(struct vfs_file_t *file);
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/**
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* @brief 释放pcb
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*
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* @param pcb
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* @return int
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*/
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int process_release_pcb(struct process_control_block *pcb);
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/**
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* @brief 切换页表
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* @param prev 前一个进程的pcb
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* @param next 下一个进程的pcb
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*
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*/
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#define process_switch_mm(next_pcb) \
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do \
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{ \
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asm volatile("movq %0, %%cr3 \n\t" ::"r"(next_pcb->mm->pgd) \
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: "memory"); \
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} while (0)
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// flush_tlb();
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// 获取当前cpu id
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#define proc_current_cpu_id (current_pcb->cpu_id)
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extern unsigned long head_stack_start; // 导出内核层栈基地址（定义在head.S）
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extern ul _stack_start;
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extern void ret_from_intr(void); // 导出从中断返回的函数（定义在entry.S）
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extern struct tss_struct initial_tss[MAX_CPU_NUM];
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extern struct mm_struct initial_mm;
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extern struct thread_struct initial_thread;
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extern union proc_union initial_proc_union;
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extern struct process_control_block *initial_proc[MAX_CPU_NUM];
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