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// .ident "@(#) r94aio.s 1.1 95/09/28 18:36:07 nec"
//++
//
// Copyright (c) 1994 KOBE NEC Software Corporation
//
// Module Name:
//
// r94aio.s
//
// Abstract:
//
// This module implements the system dependent kernel function to read
// and write the 64-bit register on a MIPS R4000 R94A system.
//
// Author:
//
// Environment:
//
// Kernel mode only.
//
// Revision History:
//
// H000 Fri Oct 7 19:57:09 JST 1994 kbnes!kisimoto
// new READ_REGISTER_DWORD
// new WRITE_REGISTER_DWORD
//
//--
#if defined(_R94A_)
#include "halmips.h"
//++
//
// VOID
// READ_REGISTER_DWORD (
// IN PLARGE_INTEGER RegisterAddress,
// IN PVOID Variable
// )
//
// Routine Description:
//
// 64-bit I/O space register read function.
//
// Arguments:
//
// RegisterAddress (a0) - Supplies a pointer to the destination address of
// the move operation.
//
// Variable (a1) - Supplies a pointer to the source address of the move
// operation.
//
// Return Value:
//
// None.
//
// Destination and Source must be 8-byte aligned.
//
//--
LEAF_ENTRY(READ_REGISTER_DWORD)
ldc1 f0,0(a0) // move 8-byte block
sdc1 f0,0(a1) //
sync // synchronize read
j ra // return
.end READ_REGISTER_DWORD
//++
//
// VOID
// WRITE_REGISTER_DWORD (
// IN PLARGE_INTEGER RegisterAddress,
// IN PVOID Variable
// )
//
// Routine Description:
//
// 64-bit I/O space register write function.
//
// Arguments:
//
// RegisterAddress (a0) - Supplies a pointer to the destination address of
// the move operation.
//
// Variable (a1) - Supplies a pointer to the source address of the move
// operation.
//
// Return Value:
//
// None.
//
// Destination and Source must be 8-byte aligned.
//
//--
LEAF_ENTRY(WRITE_REGISTER_DWORD)
ldc1 f0,0(a1) // move 8-byte block
sdc1 f0,0(a0) //
sync // synchronize write
j ra // return
.end WRITE_REGISTER_DWORD
//++
//
// VOID
// HalpGetStatusRegister (
// IN PULONG Variable
// )
//
// Routine Description:
//
// This function returns value which is status register of R4400.
//
// Arguments:
//
// Variable (a0) - Supplies a pointer to the destination address of
// the move operation.
//
// Return Value:
//
// None.
//
//--
LEAF_ENTRY(HalpGetStatusRegister)
.set noreorder
.set noat
mfc0 t0,psr // get current processor status
nop // 1 cycle hazzard
sw t0,0(a0) // save integer registers a0 - a3
.set at
.set reorder
j ra // return
.end HalpGetStatusRegister
#endif
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