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VIDEO_PUBLIC_ACCESS_RANGES structure (ntddvdeo.h)

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The VIDEO_PUBLIC_ACCESS_RANGES structure contains information about video resources other than frame buffers and video RAM, such as memory-mapped I/O registers or ports.

Syntax

typedef struct _VIDEO_PUBLIC_ACCESS_RANGES {
  ULONG InIoSpace;
  ULONG MappedInIoSpace;
  PVOID VirtualAddress;
} VIDEO_PUBLIC_ACCESS_RANGES, *PVIDEO_PUBLIC_ACCESS_RANGES;

Members

InIoSpace

Indicates the location of the range. This parameter can be one of the following values, or certain bitwise combinations of these values:

Value Meaning
VIDEO_MEMORY_SPACE_DENSE Obsolete.
VIDEO_MEMORY_SPACE_IO The indicated address ranges are in system I/O space rather than in memory space.
VIDEO_MEMORY_SPACE_MEMORY The indicated address ranges are in memory space rather than in system I/O space.
VIDEO_MEMORY_SPACE_P6CACHE The processor aggregates a sequence of write operations and sends them to a given cache line. The processor then flushes the cache. This flag is meaningful only when VIDEO_MEMORY_SPACE_IO is not set.
VIDEO_MEMORY_SPACE_USER_MODE Indicates that the address range specified should be mapped into user mode rather than kernel mode. This flag is meaningful only when VIDEO_MEMORY_SPACE_IO is not set.

MappedInIoSpace

Indicates, on the current platform, whether the registers or ports are mapped in I/O space or in memory space. A value of TRUE (1) indicates that the registers or ports are mapped in I/O space; a value of FALSE (0) indicates that the registers or ports are mapped in memory space.

VirtualAddress

Pointer to the location of the registers or I/O ports as mapped under the current architecture.

Remarks

VIDEO_PUBLIC_ACCESS_RANGES is similar to VIDEO_ACCESS_RANGE in that both are used by miniport drivers to obtain information about display resources. The principal difference is that VIDEO_PUBLIC_ACCESS_RANGES contains information about control and accelerator registers for an adapter, while VIDEO_ACCESS_RANGE is used to hold frame buffer and video RAM addresses.

VIDEO_PUBLIC_ACCESS_RANGES is used as an input buffer with the IOCTL_VIDEO_QUERY_PUBLIC_ACCESS_RANGES request.

Requirements

Requirement Value
Header ntddvdeo.h (include Ntddvdeo.h)

See also

IOCTL_VIDEO_QUERY_PUBLIC_ACCESS_RANGES

VIDEO_ACCESS_RANGE