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