236 lines
4.0 KiB
C
236 lines
4.0 KiB
C
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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inoutops.c
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Abstract:
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This module implements the code to emulate the in and out opcodes.
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Author:
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David N. Cutler (davec) 7-Nov-1994
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "nthal.h"
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#include "emulate.h"
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VOID
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XmInOp (
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IN PRXM_CONTEXT P
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)
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/*++
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Routine Description:
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This function emulates a inb/w/d opcode.
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Arguments:
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P - Supplies a pointer to the emulation context structure.
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Return Value:
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None.
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--*/
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{
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//
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// Check if the I/O port number is valid.
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//
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if ((P->SrcValue.Long + P->DataType) > 0xffff) {
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longjmp(&P->JumpBuffer[0], XM_ILLEGAL_PORT_NUMBER);
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}
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//
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// Set the destination address, input from the specified port, and
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// store the result.
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//
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P->DstLong = (ULONG UNALIGNED *)(&P->Gpr[EAX].Exx);
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XmStoreResult(P, (P->ReadIoSpace)(P->DataType, P->SrcValue.Word));
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return;
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}
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VOID
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XmInsOp (
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IN PRXM_CONTEXT P
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)
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/*++
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Routine Description:
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This function emulates a insb/w/d opcode.
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Arguments:
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P - Supplies a pointer to the emulation context structure.
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Return Value:
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None.
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--*/
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{
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ULONG Count;
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USHORT PortNumber;
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//
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// If a repeat prefix is active, then the loop count is specified
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// by eCX. Otherwise, the loop count is one.
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//
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Count = 1;
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if (P->RepeatPrefixActive != FALSE) {
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if (P->OpaddrPrefixActive != FALSE) {
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Count = P->Gpr[ECX].Exx;
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P->Gpr[ECX].Exx = 0;
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} else {
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Count = P->Gpr[CX].Xx;
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P->Gpr[CX].Xx = 0;
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}
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}
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//
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// Move items from the input port to the destination string.
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//
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PortNumber = P->SrcValue.Word;
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while (Count != 0) {
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//
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// Set the destination address, input from the specified port, and
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// store the result.
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//
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P->DstLong = (ULONG UNALIGNED *)XmGetStringAddress(P, ES, EDI);
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XmStoreResult(P, (P->ReadIoSpace)(P->DataType, PortNumber));
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Count -= 1;
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}
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return;
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}
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VOID
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XmOutOp (
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IN PRXM_CONTEXT P
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)
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/*++
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Routine Description:
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This function emulates a outb/w/d opcode.
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Arguments:
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P - Supplies a pointer to the emulation context structure.
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Return Value:
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None.
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--*/
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{
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USHORT PortNumber;
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//
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// Check if the I/O port number is valid.
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//
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if ((P->SrcValue.Long + P->DataType) > 0xffff) {
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longjmp(&P->JumpBuffer[0], XM_ILLEGAL_PORT_NUMBER);
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}
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//
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// Save the port number, get the source value, and output to the port.
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//
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PortNumber = P->SrcValue.Word;
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XmSetSourceValue(P, &P->Gpr[EAX].Exx);
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(P->WriteIoSpace)(P->DataType, PortNumber, P->SrcValue.Long);
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return;
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}
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VOID
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XmOutsOp (
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IN PRXM_CONTEXT P
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)
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/*++
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Routine Description:
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This function emulates a outsb/w/d opcode.
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Arguments:
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P - Supplies a pointer to the emulation context structure.
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Return Value:
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None.
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--*/
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{
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ULONG Count;
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USHORT PortNumber;
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//
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// If a repeat prefix is active, then the loop count is specified
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// by eCX. Otherwise, the loop count is one.
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//
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Count = 1;
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if (P->RepeatPrefixActive != FALSE) {
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if (P->OpaddrPrefixActive != FALSE) {
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Count = P->Gpr[ECX].Exx;
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P->Gpr[ECX].Exx = 0;
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} else {
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Count = P->Gpr[CX].Xx;
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P->Gpr[CX].Xx = 0;
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}
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}
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//
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// Move items from the source string to the output port.
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//
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PortNumber = P->SrcValue.Word;
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while (Count != 0) {
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//
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// Set the source value and output to the specified port.
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//
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XmSetSourceValue(P, XmGetStringAddress(P, P->DataSegment, ESI));
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(P->WriteIoSpace)(P->DataType, PortNumber, P->SrcValue.Long);
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Count -= 1;
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}
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return;
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}
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