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sys_write
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@ -268,6 +268,43 @@ uint64_t sys_read(struct pt_regs *regs)
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return ret;
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}
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/**
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* @brief 向文件写入数据
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*
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* @param fd_num regs->r8 文件描述符号
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* @param buf regs->r9 输入缓冲区
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* @param count regs->r10 要写入的字节数
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*
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* @return uint64_t
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*/
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uint64_t sys_write(struct pt_regs *regs)
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{
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int fd_num = (int)regs->r8;
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void *buf = (void *)regs->r9;
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int64_t count = (int64_t)regs->r10;
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// kdebug("sys read: fd=%d", fd_num);
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// 校验文件描述符范围
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if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
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return -EBADF;
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// 文件描述符不存在
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if (current_pcb->fds[fd_num] == NULL)
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return -EBADF;
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if (count < 0)
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return -EINVAL;
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struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
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uint64_t ret;
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if (file_ptr->file_ops && file_ptr->file_ops->write)
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ret = file_ptr->file_ops->write(file_ptr, (char *)buf, count, &(file_ptr->position));
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return ret;
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}
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ul sys_ahci_end_req(struct pt_regs *regs)
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{
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ahci_end_request();
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@ -14,5 +14,6 @@
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#define SYS_OPEN 2
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#define SYS_CLOSE 3
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#define SYS_READ 4
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#define SYS_WRITE 5
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#define SYS_AHCI_END_REQ 255 // AHCI DMA请求结束end_request的系统调用
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