Int 2F/AX=1607h/BX=0021h

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MS Windows - PageFile VIRTUAL DEVICE - GET LOCK BYTE

AX = 1607h
BX = 0021h (PageFile VxD ID)
CX = 0000h

Return:
AX = status 0000h success ES:DI -> cache lock byte in disk cacher other no disk cache or unsupported

Notes: PageFile issues this call on real-mode initialization in order to allow disk caches to provide it with a byte which it can use to temporarily lock the disk cache; VMPOLL also issues this call, so it is made twice each time Windows starts up. If this call fails, PageFile falls back to other techniques for locking the disk cache

See Also: AX=1607h"CALL OUT API"

Category: Windows - Int 2Fh - M

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