// wdm.h

typedef enum _DMA_COMMON_BUFFER_EXTENDED_CONFIGURATION_ACCESS_TYPE {
  CommonBufferHardwareAccessReadOnly,
  CommonBufferHardwareAccessWriteOnly,
  CommonBufferHardwareAccessReadWrite,
  CommonBufferHardwareAccessMax
} DMA_COMMON_BUFFER_EXTENDED_CONFIGURATION_ACCESS_TYPE, *PDMA_COMMON_BUFFER_EXTENDED_CONFIGURATION_ACCESS_TYPE;
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Windows Driver Kit DDI reference (ne-wdm-dma_common_buffer_extended_configuration_access_type)

Description

Specifies permissions for hardware access for a common buffer being created when the ConfigType field of the DMA_COMMON_BUFFER_EXTENDED_CONFIGURATION structure is CommonBufferConfigTypeHardwareAccessPermissions.

Constants

`CommonBufferHardwareAccessReadOnly`

Hardware has read access to the common buffer.

`CommonBufferHardwareAccessWriteOnly`

Hardware has write access to the common buffer.

`CommonBufferHardwareAccessReadWrite`

Hardware has both read and write access to the common buffer.

`CommonBufferHardwareAccessMax`

The number of common buffer hardware access values for this enumeration type that represent actual access types.

DMA_COMMON_BUFFER_EXTENDED_CONFIGURATION_ACCESS_TYPE - NtDoc