HV_X64_IO_PORT_ACCESS_INFO union
The HV_X64_IO_PORT_ACCESS_INFO union describes flags that provide information about memory access.
Syntax
typedef union _HV_X64_IO_PORT_ACCESS_INFO { UINT8 AsUINT8; struct { UINT8 AccessSize :3; UINT8 StringOp :1; UINT8 RepPrefix :1; UINT8 Reserved :3; }; } HV_X64_IO_PORT_ACCESS_INFO, *PHV_X64_IO_PORT_ACCESS_INFO;
Members
- AsUINT8
-
A member in the union that can hold one 8-bit value that describes information about memory access.
- AccessSize
-
A UINT8 value that indicates the size of the memory access. The following encodings are used:
-
001b = 8 bits
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010b = 16 bits
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100b = 32 bits
All other combinations are reserved.
The memory-access size is set in the first through third bits of the 8-bit AsUINT8 member (0x07).
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- StringOp
-
A UINT8 value that indicates whether the instruction is a string form (INS or OUTS). Setting this member is equivalent to setting the fourth bit of the 8-bit AsUINT8 member (0x08).
- RepPrefix
-
A UINT8 value that indicates whether the instruction has a "rep" prefix. This flag is used only for string operations. Setting this member is equivalent to setting the fifth bit of the 8-bit AsUINT8 member (0x10).
- Reserved
-
This member is reserved and should be set to zero. Setting this member to zero is equivalent to setting the remaining three bits (0xE0) of the 8-bit AsUINT8 member to zeros.
Remarks
Requirements
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Build date: 11/16/2013