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🆕 用户态解析键盘扫描码

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This commit is contained in:
fslongjin
2022-05-21 21:49:56 +08:00
parent b9c4efcb0f
commit e6108602df
13 changed files with 626 additions and 439 deletions
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29
kernel/syscall/syscall.c
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@ -7,6 +7,8 @@
#include <common/errno.h>
#include <common/fcntl.h>
#include <filesystem/fat32/fat32.h>
#include <filesystem/VFS/VFS.h>
#include <driver/keyboard/ps2_keyboard.h>
// 导出系统调用入口函数，定义在entry.S中
extern void system_call(void);
@ -108,8 +110,9 @@ uint64_t sys_open(struct pt_regs *regs)
char *filename = (char *)(regs->r8);
int flags = (int)(regs->r9);
kdebug("filename=%s", filename);
long path_len = strnlen_user(filename, PAGE_4K_SIZE);
long path_len = strnlen_user(filename, PAGE_4K_SIZE) + 1;
if (path_len <= 0) // 地址空间错误
{
@ -130,20 +133,30 @@ uint64_t sys_open(struct pt_regs *regs)
// 寻找文件
struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
kfree(path);
if (dentry != NULL)
printk_color(ORANGE, BLACK, "Found %s\nDIR_FstClus:%#018lx\tDIR_FileSize:%#018lx\n", path, ((struct fat32_inode_info_t *)(dentry->dir_inode->private_inode_info))->first_clus, dentry->dir_inode->file_size);
else
printk_color(ORANGE, BLACK, "Can`t find file\n");
if (dentry == NULL)
kfree(path);
if (dentry == NULL)
return -ENOENT;
// 暂时认为目标是目录是一种错误
if (dentry->dir_inode->attribute == VFS_ATTR_DIR)
return -EISDIR;
// todo: 引入devfs后删除这段代码
// 暂时遇到设备文件的话，就将其first clus设置为特定值
if (path_len >= 5 && filename[0] == '/' && filename[1] == 'd' && filename[2] == 'e' && filename[3] == 'v' && filename[4] == '/')
{
// 对于fat32文件系统上面的设备文件，设置其起始扇区
((struct fat32_inode_info_t *)(dentry->dir_inode->private_inode_info))->first_clus |= 0xf0000000;
dentry->dir_inode->sb->sb_ops->write_inode(dentry->dir_inode);
dentry->dir_inode->attribute |= VFS_ATTR_DEVICE;
}
// 创建文件描述符
struct vfs_file_t *file_ptr = (struct vfs_file_t *)kmalloc(sizeof(struct vfs_file_t), 0);
memset(file_ptr, 0, sizeof(struct vfs_file_t));
@ -152,7 +165,15 @@ uint64_t sys_open(struct pt_regs *regs)
file_ptr->dEntry = dentry;
file_ptr->mode = flags;
file_ptr->file_ops = dentry->dir_inode->file_ops;
// todo: 接入devfs
// 特判一下是否为键盘文件
if (dentry->dir_inode->attribute & VFS_ATTR_DEVICE)
{
file_ptr->file_ops = &ps2_keyboard_fops; // 如果是设备文件，暂时认为它是键盘文件
}
else
file_ptr->file_ops = dentry->dir_inode->file_ops;
// 如果文件系统实现了打开文件的函数
if (file_ptr->file_ops && file_ptr->file_ops->open)