IOS iokit

实现iOS iokit_mapped的步骤和代码注释

简介

在iOS开发中，iokit_mapped是一种可以用来访问设备硬件的技术。它通过从I/O Kit中映射物理内存来提供对设备硬件的访问权限。本文将向你介绍如何实现iOS iokit_mapped，并提供详细的步骤和代码注释。

流程图

flowchart TD
    A(开始) --> B(导入必要的库)
    B --> C(获取IOService)
    C --> D(IOServiceOpen)
    D --> E(IOConnectMapMemory)
    E --> F(操作设备硬件)
    F --> G(IOConnectUnmapMemory)
    G --> H(IOServiceClose)
    H --> I(结束)

步骤和代码注释

1. 导入必要的库

// 导入必要的库
import IOKit
import IOKit.IOKitLib
import IOKit.IOMemoryDescriptor

2. 获取IOService

// 获取IOService
var service: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("YourDeviceName"))
guard service != IO_OBJECT_NULL else {
    print("无法找到设备")
    return
}

3. 打开IOService

// 打开IOService
var connect: io_connect_t = IO_OBJECT_NULL
let result = IOServiceOpen(service, mach_task_self_, UInt32(kIOServiceAppropriateMemoryType), &connect)
guard result == KERN_SUCCESS else {
    print("无法打开设备")
    return
}

4. 映射设备物理内存

// 映射设备物理内存
var map: mach_vm_address_t = 0
var size: mach_vm_size_t = 0
let result = IOConnectMapMemory(connect, UInt32(kIODefaultMemoryType), mach_task_self_, &map, &size, IOOptionBits(kIOMapAnywhere))
guard result == KERN_SUCCESS else {
    print("无法映射设备内存")
    return
}

5. 操作设备硬件

// 操作设备硬件
let ptr = UnsafeMutableRawPointer(bitPattern: map)
// 使用ptr进行设备硬件操作

6. 解除设备内存映射

// 解除设备内存映射
let result = IOConnectUnmapMemory(connect, UInt32(kIODefaultMemoryType), mach_task_self_, map)
guard result == KERN_SUCCESS else {
    print("无法解除设备内存映射")
    return
}

7. 关闭IOService

// 关闭IOService
let result = IOServiceClose(connect)
guard result == KERN_SUCCESS else {
    print("无法关闭设备")
    return
}

完整代码：

// 导入必要的库
import IOKit
import IOKit.IOKitLib
import IOKit.IOMemoryDescriptor

// 获取IOService
var service: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("YourDeviceName"))
guard service != IO_OBJECT_NULL else {
    print("无法找到设备")
    return
}

// 打开IOService
var connect: io_connect_t = IO_OBJECT_NULL
let result = IOServiceOpen(service, mach_task_self_, UInt32(kIOServiceAppropriateMemoryType), &connect)
guard result == KERN_SUCCESS else {
    print("无法打开设备")
    return
}

// 映射设备物理内存
var map: mach_vm_address_t = 0
var size: mach_vm_size_t = 0
let result = IOConnectMapMemory(connect, UInt32(kIODefaultMemoryType), mach_task_self_, &map, &size, IOOptionBits(kIOMapAnywhere))
guard result == KERN_SUCCESS else {
    print("无法映射设备内存")
    return
}

// 操作设备硬件
let ptr = UnsafeMutableRawPointer(bitPattern: map)
// 使用ptr进行设备硬件操作

// 解除设备内存映射
let result = IOConnectUnmapMemory(connect, UInt32(kIODefaultMemoryType), mach_task_self_, map)
guard result == KERN_SUCCESS else {
    print("无法解除设备内存映射")
    return
}

// 关闭IOService
let result = IOServiceClose(connect)
guard result == KERN_SUCCESS else {
    print("无法关闭设备")
    return
}

以上就是实现iOS iokit_mapped的步骤和代码