=> R1 = &8E (reason code)
R2 = page block filled in by PreGrow routine
R3 = number of entries in page block
This service is broadcast to inform recipients that the pages specified are about to be swapped with different pages. DMA operations involving these pages should be suspended until Service_PagesSafe is received. This call must not be claimed.
On systems with memory above 4GB those pages are communicated via Service_PagesUnsafe64 and not via this service.
See PRM 5a, page 48
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