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Annotation of XNU/iokit/Drivers/platform/drvAppleNVRAM/AppleNVRAM.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:  *  16 Feb 1998 suurballe  Created.
        !            24:  */
        !            25: 
        !            26: #include <IOKit/IOLib.h>
        !            27: #include "AppleNVRAM.h"
        !            28: 
        !            29: 
        !            30: #define super IONVRAMController
        !            31: OSDefineMetaClassAndStructors(AppleNVRAM, IONVRAMController)
        !            32: 
        !            33: 
        !            34: // **********************************************************************************
        !            35: // start
        !            36: //
        !            37: // **********************************************************************************
        !            38: bool AppleNVRAM::start ( IOService * nub )
        !            39: {
        !            40:     IOItemCount numRanges;
        !            41:     IOMemoryMap * map;
        !            42:         
        !            43:     nvram_kind = NVRAM_NONE;
        !            44:     nvram_data = NULL;
        !            45:     nvram_port = NULL;
        !            46: 
        !            47:     numRanges = nub->getDeviceMemoryCount( );
        !            48:     
        !            49:     if ( numRanges == 1 ) {
        !            50:         nvram_kind = NVRAM_IOMEM;
        !            51:         if( 0 == (map = nub->mapDeviceMemoryWithIndex( 0 )) ) {
        !            52:                  return false;
        !            53:         }
        !            54:         nvram_data = (unsigned char *)map->getVirtualAddress();
        !            55:         return super::start( nub );
        !            56:     }
        !            57:     if ( numRanges == 2 ) {
        !            58:         nvram_kind = NVRAM_PORT;
        !            59:         if( 0 == (map = nub->mapDeviceMemoryWithIndex( 0 )) ) {
        !            60:                  return false;
        !            61:         }
        !            62:         nvram_port = (unsigned char *)map->getVirtualAddress();
        !            63:         if( 0 == (map = nub->mapDeviceMemoryWithIndex( 1 )) ) {
        !            64:                  return false;
        !            65:         }
        !            66:         nvram_data = (unsigned char *)map->getVirtualAddress();
        !            67:         return super::start( nub );
        !            68:     }
        !            69:     return false;
        !            70: }
        !            71: 
        !            72: 
        !            73: 
        !            74: // **********************************************************************************
        !            75: // openNVRAM
        !            76: //
        !            77: //
        !            78: // **********************************************************************************
        !            79: IOReturn AppleNVRAM::openNVRAM ( void )
        !            80: {
        !            81:     if (nvram_kind == NVRAM_NONE) {
        !            82:         return (kNoNVRAM);
        !            83:     }
        !            84:     return kNoError;
        !            85: }
        !            86: 
        !            87: // **********************************************************************************
        !            88: // readNVRAM
        !            89: //
        !            90: // The NVRAM driver is calling to read part of the NVRAM. 
        !            91: //
        !            92: // **********************************************************************************
        !            93: IOReturn AppleNVRAM::readNVRAM ( UInt32 Offset, IOByteCount * Length, UInt8 * Buffer )
        !            94: {
        !            95: IOByteCount    i;
        !            96: UInt8 *                client_buffer = Buffer;
        !            97: UInt32         our_offset = Offset;
        !            98: 
        !            99: if (nvram_kind == NVRAM_NONE) {
        !           100:     return (kNoNVRAM);
        !           101: }
        !           102: 
        !           103: if ( (Buffer == NULL) ||
        !           104:          (*Length == 0) ||
        !           105:          (*Length > 8192) ||
        !           106:          (Offset > 8192) ||
        !           107:          ((*Length + Offset) > 8192) ) {
        !           108:         return kParameterError;
        !           109: }
        !           110: 
        !           111: switch (nvram_kind) {
        !           112:     case       NVRAM_IOMEM:
        !           113:         for (i = 0; i < *Length; i++,our_offset++)  {
        !           114:             *client_buffer++ = nvram_data[our_offset << 4];
        !           115:             eieio();
        !           116:         }
        !           117:         break;
        !           118: 
        !           119:     case       NVRAM_PORT:
        !           120:         for (i = 0; i < *Length; i++,our_offset++) {
        !           121:             *nvram_port = our_offset >> 5;
        !           122:             eieio();
        !           123:             *client_buffer++ = nvram_data[(our_offset & 0x1f) << 4];
        !           124:             eieio();
        !           125:         }
        !           126:         break;
        !           127: }
        !           128: 
        !           129: return kNoError;
        !           130: }
        !           131: 
        !           132: 
        !           133: // **********************************************************************************
        !           134: // writeNVRAM
        !           135: //
        !           136: // The NVRAM driver is calling to write part of the NVRAM.  We translate this into
        !           137: // single-byte PMU commands and enqueue them to our command queue.
        !           138: //
        !           139: // **********************************************************************************
        !           140: IOReturn AppleNVRAM::writeNVRAM ( UInt32 Offset, IOByteCount * Length, UInt8 * Buffer )
        !           141: {
        !           142: IOByteCount    i;
        !           143: UInt32         our_offset = Offset;
        !           144: UInt8 *                client_buffer = Buffer;
        !           145: 
        !           146: if (nvram_kind == NVRAM_NONE) {
        !           147:     return (kNoNVRAM);
        !           148: }
        !           149: 
        !           150: if ( (Buffer == NULL) ||
        !           151:          (*Length == 0) ||
        !           152:          (*Length > 8192) ||
        !           153:          (Offset > 8192) ||
        !           154:          ((*Length + Offset) > 8192) ) {
        !           155:         return kParameterError;
        !           156: }
        !           157: 
        !           158: switch (nvram_kind) {
        !           159:     case       NVRAM_IOMEM:
        !           160:         for (i = 0; i < *Length; i++,our_offset++)  {
        !           161:             nvram_data[our_offset << 4] = *client_buffer++;
        !           162:             eieio();
        !           163:         }
        !           164:         break;
        !           165: 
        !           166:     case       NVRAM_PORT:
        !           167:         for (i = 0; i < *Length; i++, our_offset++) {
        !           168:             *nvram_port = our_offset >> 5;
        !           169:             eieio();
        !           170:             nvram_data[(our_offset & 0x1f) << 4] = *client_buffer++;
        !           171:             eieio();
        !           172:         }
        !           173:         break;
        !           174: }
        !           175: return kNoError;
        !           176: }

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