Specifications

Data Structures
1.13 I/O Request Packet Extension (IRPE)
IOC$IOPOST automatically unlocks the pages in region 1 (if defined) and
region 2 (if defined) for all the IRPEs linked to the IRP undergoing completion
processing. IOC$IOPOST also deallocates all the IRPEs.
The I/O request packet extension is illustrated in Figure 1–16 and described in
Table 1–15.
Figure 1–16 I/O Request Packet Extension (IRPE)
Unused 0
IRPE$W_SIZE*IRPE$B_TYPE* 9
Unused (31 bytes)
IRPE$W_STS 40
IRPE$L_SVAPTE1 44
IRPE$W_BOFF1Unused 48
IRPE$L_BCNT1 52
IRPE$L_SVAPTE2 56
IRPE$W_BOFF2Unused 60
IRPE$L_BCNT2 64
Unused (16 bytes) 68
IRPE$L_EXTEND 84
*A read-only field
1–50