在Linux上从Java访问PC硬件端口

问题描述

Linux-on-Java与C字节大小的PC架构硬件端口输入/输出功能等效吗?

What is the Java-on-Linux equivalent to the C byte-sized PC-architecture hardware port input/output functions?

对于输出，如下所示为outb:

For output there is outb as in this:

tmp = inb(0x61);
if (tmp != (tmp | 0x01))
    outb(0x61, tmp | 0x01);

对于输入，请输入inb，如下所示:

For input there is inb as in this:

tmp = (inb(0x61) & 0xfe);
outb(0x61, tmp);

目的:我想实现一些比这更少的开销:

Purpose: I want to implement something that imposes less overhead than this:

try { Runtime.getRuntime().exec("beep") } catch (IOException e) {}

作为将代码7(钟形字符)发送到标准输出的一种替代方法，因为在Ubuntu中似乎已积极禁用了该代码.工具箱的提示音也静音.

as an alternative to sending code 7 (the bell char) to the standard output because that seems to have been aggressively disabled in Ubuntu. Toolkit's beep is also mute.

推荐答案

我认为您在拨错火车.

Java是一种编译为虚拟机体系结构的面向对象的高级语言.汇编器I/O指令特定于硬件处理器.两者之间没有直接对等的地方.

Java is a object-oriented high-level language compiling to a virtual machine architecture. Assembler I/O instructions are hardware processor specific. There is no direct equivalence between the two.

您最好的期望是将Java代码(使用管道，共享内存，套接字等)与执行所需I/O的本地Linux应用程序进行接口.

The best you could hope for is to interface your Java code (using pipes, shared memory, sockets, etc) with a native Linux app which performs the required I/O.

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