test

编写设备驱动程序

获取设备树信息

mdb 调试程序提供了用于显示内核设备树的 ::prtconf dcmd。::prtconf dcmd 的输出与 prtconf(1M) 命令的输出相似。

示例 22–20 使用 ::prtconf Dcmd


> ::prtconf
300015d3e08      SUNW,Sun-Blade-100
    300015d3c28      packages (driver not attached)
        300015d3868      SUNW,builtin-drivers (driver not attached)
        300015d3688      deblocker (driver not attached)
        300015d34a8      disk-label (driver not attached)
        300015d32c8      terminal-emulator (driver not attached)
        300015d30e8      obp-tftp (driver not attached)
        300015d2f08      dropins (driver not attached)
        300015d2d28      kbd-translator (driver not attached)
        300015d2b48      ufs-file-system (driver not attached)
    300015d3a48      chosen (driver not attached)
    300015d2968      openprom (driver not attached)

可以使用宏（如 ::devinfo dcmd）来显示节点，如以下示例所示。

示例 22–21 显示单个节点的设备信息


> 300015d3e08::devinfo
300015d3e08      SUNW,Sun-Blade-100
        System properties at 0x300015abdc0:
            name='relative-addressing' type=int items=1
                value=00000001
            name='MMU_PAGEOFFSET' type=int items=1
                value=00001fff
            name='MMU_PAGESIZE' type=int items=1
                value=00002000
            name='PAGESIZE' type=int items=1
                value=00002000
        Driver properties at 0x300015abe00:
            name='pm-hardware-state' type=string items=1
                value='no-suspend-resume'

使用 ::prtconf 可以查看驱动程序在设备树中连接的位置，以及显示设备属性。还可以为 ::prtconf 指定详细 (-v) 标志，以显示每个设备节点的属性，如下所示。

示例 22–22 在详细模式下使用 ::prtconf Dcmd


> ::prtconf -v
DEVINFO          NAME
300015d3e08      SUNW,Sun-Blade-100
        System properties at 0x300015abdc0:
            name='relative-addressing' type=int items=1
                value=00000001
            name='MMU_PAGEOFFSET' type=int items=1
                value=00001fff
            name='MMU_PAGESIZE' type=int items=1
                value=00002000
            name='PAGESIZE' type=int items=1
                value=00002000
        Driver properties at 0x300015abe00:
            name='pm-hardware-state' type=string items=1
                value='no-suspend-resume'
        ...
        300015ce798      pci10b9,5229, instance #0
                Driver properties at 0x300015ab980:
                    name='target2-dcd-options' type=any items=4
                        value=00.00.00.a4
                    name='target1-dcd-options' type=any items=4
                        value=00.00.00.a2
                    name='target0-dcd-options' type=any items=4
                        value=00.00.00.a4

另一种查找驱动程序实例的方法是使用 ::devbindings dcmd。在给定驱动程序名称的情况下，该命令会显示指定驱动程序的所有实例的列表，如以下示例所示。

示例 22–23 使用 ::devbindings Dcmd 查找驱动程序实例


> ::devbindings dad
300015ce3d8      ide-disk (driver not attached)
300015c9a60      dad, instance #0
        System properties at 0x300015ab400:
            name='lun' type=int items=1
                value=00000000
            name='target' type=int items=1
                value=00000000
            name='class_prop' type=string items=1
                value='ata'
            name='type' type=string items=1
                value='ata'
            name='class' type=string items=1
                value='dada'
...
300015c9880      dad, instance #1
        System properties at 0x300015ab080:
            name='lun' type=int items=1
                value=00000000
            name='target' type=int items=1
                value=00000002
            name='class_prop' type=string items=1
                value='ata'
            name='type' type=string items=1
                value='ata'
            name='class' type=string items=1
                value='dada'