DragonOS-Community/DragonOS
4
1
Fork 0
mirror of https://github.com/DragonOS-Community/DragonOS.git synced 2025-06-18 12:16:31 +00:00
Code Issues Releases Wiki Activity

🆕 sys_open系统调用

Browse Source
This commit is contained in:
fslongjin
2022-04-27 00:39:02 +08:00
parent d94d92f5ee
commit 966d67fcde
14 changed files with 343 additions and 144 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
kernel/process/process.h
View File

@ -16,6 +16,11 @@
#include "../syscall/syscall.h"
#include "ptrace.h"
#include <filesystem/VFS/VFS.h>
// 进程最大可拥有的文件描述符数量
#define PROC_MAX_FD_NUM 16
// 进程的内核栈大小 32K
#define STACK_SIZE 32768
@ -116,6 +121,10 @@ struct process_control_block
long pid;
long priority; // 优先级
long virtual_runtime; // 虚拟运行时间
// 进程拥有的文件描述符的指针数组
// todo: 改用动态指针数组
struct vfs_file_t *fds[PROC_MAX_FD_NUM];
};
// 将进程的pcb和内核栈融合到一起,8字节对齐
@ -138,7 +147,8 @@ union proc_union
.signal = 0, \
.priority = 2, \
.preempt_count = 0, \
.cpu_id = 0 \
.cpu_id = 0, \
.fds = { 0 } \
}
/**
@ -211,19 +221,17 @@ struct process_control_block *get_current_pcb()
#define switch_proc(prev, next) \
do \
{ \
__asm__ __volatile__("cli \n\t" \
"pushq %%rbp \n\t" \
__asm__ __volatile__("pushq %%rbp \n\t" \
"pushq %%rax \n\t" \
"movq %%rsp, %0 \n\t" \
"movq %2, %%rsp \n\t" \
"leaq switch_proc_ret_addr(%%rip), %%rax \n\t" \
"leaq switch_proc_ret_addr(%%rip), %%rax \n\t" \
"movq %%rax, %1 \n\t" \
"pushq %3 \n\t" \
"jmp __switch_to \n\t" \
"switch_proc_ret_addr: \n\t" \
"switch_proc_ret_addr: \n\t" \
"popq %%rax \n\t" \
"popq %%rbp \n\t" \
"sti \n\t" \
: "=m"(prev->thread->rsp), "=m"(prev->thread->rip) \
: "m"(next->thread->rsp), "m"(next->thread->rip), "D"(prev), "S"(next) \
: "memory"); \