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Annotation of XNU/iokit/Drivers/platform/drvAppleKeyLargo/KeyLargo.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1999 Apple Computer, Inc.  All rights reserved.
        !            24:  *
        !            25:  *  DRI: Josh de Cesare
        !            26:  *
        !            27:  */
        !            28: 
        !            29: #include <ppc/proc_reg.h>
        !            30: 
        !            31: #include <IOKit/IOLib.h>
        !            32: #include <IOKit/IODeviceTreeSupport.h>
        !            33: #include <IOKit/IODeviceMemory.h>
        !            34: 
        !            35: #include "KeyLargo.h"
        !            36: 
        !            37: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
        !            38: 
        !            39: #define super AppleMacIO
        !            40: 
        !            41: OSDefineMetaClassAndStructors(KeyLargo, AppleMacIO);
        !            42: 
        !            43: bool KeyLargo::start(IOService *provider)
        !            44: {
        !            45:   // Call MacIO's start.
        !            46:   if (!super::start(provider))
        !            47:     return false;
        !            48:   
        !            49:   // Make nubs for the children.
        !            50:   publishBelow(provider);
        !            51:   
        !            52:   // get the base address of KeyLargo.
        !            53:   keyLargoBaseAddress = fMemory->getVirtualAddress();
        !            54:   
        !            55:   registerService();
        !            56:     
        !            57:   return true;
        !            58: }
        !            59: 
        !            60: 
        !            61: long long KeyLargo::syncTimeBase(void)
        !            62: {
        !            63:   long          cnt;
        !            64:   unsigned long gtLow, gtHigh, gtHigh2;
        !            65:   unsigned long tbLow, tbHigh;
        !            66:   long long     tmp, diffTicks, ratioLow, ratioHigh;
        !            67:   
        !            68:   ratioLow = (24907667ULL << 32) / kKeyLargoGTimerFreq;
        !            69:   ratioHigh = ratioLow >> 32;
        !            70:   ratioLow &= 0xFFFFFFFFULL;
        !            71:   
        !            72:   // Save the old time base.
        !            73:   diffTicks = ((long long)mftbu() << 32) | mftb();
        !            74:   
        !            75:   // Do the sync twice to make sure it is cached.
        !            76:   for (cnt = 0; cnt < 2; cnt++) {
        !            77:     // Read the Global Counter.
        !            78:     do {
        !            79:       gtHigh  = readRegUInt32(kKeyLargoCounterHiOffset);
        !            80:       gtLow   = readRegUInt32(kKeyLargoCounterLoOffset);
        !            81:       gtHigh2 = readRegUInt32(kKeyLargoCounterHiOffset);
        !            82:     } while (gtHigh != gtHigh2);
        !            83:     
        !            84:     tmp = gtHigh * ratioLow + gtLow * ratioHigh +
        !            85:       ((gtLow * ratioLow + 0x80000000UL) >> 32);
        !            86:     tbHigh = gtHigh * ratioHigh + (tmp >> 32);
        !            87:     tbLow = tmp & 0xFFFFFFFFULL;
        !            88:     
        !            89:     mttb(tbLow);
        !            90:     mttbu(tbHigh);
        !            91:   }
        !            92:   
        !            93:   diffTicks = (((long long)tbHigh << 32) | tbLow) - diffTicks;
        !            94:   
        !            95:   return diffTicks;
        !            96: }
        !            97: 
        !            98: UInt8 KeyLargo::readRegUInt8(unsigned long offest)
        !            99: {
        !           100:   return *(UInt8 *)(keyLargoBaseAddress + offest);
        !           101: }
        !           102: 
        !           103: void KeyLargo::writeRegUInt8(unsigned long offest, UInt8 data)
        !           104: {
        !           105:   *(UInt8 *)(keyLargoBaseAddress + offest) = data;
        !           106:   eieio();
        !           107: }
        !           108: 
        !           109: UInt32 KeyLargo::readRegUInt32(unsigned long offest)
        !           110: {
        !           111:   return lwbrx(keyLargoBaseAddress + offest);
        !           112: }
        !           113: 
        !           114: void KeyLargo::writeRegUInt32(unsigned long offest, UInt32 data)
        !           115: {
        !           116:   stwbrx(data, keyLargoBaseAddress + offest);
        !           117:   eieio();
        !           118: }

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