## Graphics Adapter Device Driver Reference

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### HWREQIN Field - ulFlags

ulFlags (ULONG) Request option flags.

Request option flags can be defined as follows:

#define REQUEST_HW 0x01
#define REQUEST_SEM_ONLY 0x02

If the REQUEST_HW flag is set, the VMAN hardware serialization lock is obtained, and pointer exclusion is performed.

If the REQUEST_HW flag is set and the REQUEST_SEM_ONLY flag is not set, VMAN invokes the GRADD for GHI_CMD_REQUESTHW to request the linear aperture to the frame buffer.
If the REQUEST_HW flag is set and the REQUEST_SEM_ONLY flag is set, VMAN does not invoke the GRADD for GHI_CMD_REQUESTHW.

If the REQUEST_HW flag is not set, the VMAN hardware serialization lock is released, and pointer exclusion is ended.

If the REQUEST_HW flag is not set and the REQUEST_SEM_ONLY flag is not set , VMAN invokes the GRADD for GHI_CMD_REQUESTHW to release the linear aperture to the frame buffer.
If the REQUEST_HW flag is not set and the REQUEST_SEM_ONLY flag is set, VMAN does not invoke the GRADD for GHI_CMD_REQUESTHW.