driver_ioctl.h

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#define PORTTALK_TYPE 40000 /* 32768-65535 are reserved for customers */

// The IOCTL function codes from 0x8000 to 0xFFFF are for customer use.

#define IOCTL_IOPM_RESTRICT_ALL_ACCESS \
    CTL_CODE(PORTTALK_TYPE, 0x900, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_IOPM_ALLOW_EXCUSIVE_ACCESS \
    CTL_CODE(PORTTALK_TYPE, 0x901, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_SET_IOPM \
    CTL_CODE(PORTTALK_TYPE, 0x902, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_ENABLE_IOPM_ON_PROCESSID \
    CTL_CODE(PORTTALK_TYPE, 0x903, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_READ_PORT_UCHAR \
    CTL_CODE(PORTTALK_TYPE, 0x904, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_WRITE_PORT_UCHAR \
    CTL_CODE(PORTTALK_TYPE, 0x905, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_READ_PORT_ULONG \
    CTL_CODE(PORTTALK_TYPE, 0x906, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_WRITE_PORT_ULONG \
    CTL_CODE(PORTTALK_TYPE, 0x907, METHOD_BUFFERED, FILE_ANY_ACCESS)