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Annotation of driverkit/Examples/IOStub/IOStubDevice.m, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*     IOStubDevice.m  1.0     02/07/91        (c) 1991 NeXT   
        !            25:  *
        !            26:  * IOStubDevice.m - Implementation of "Device-specific" IOStub functions.
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 07-Feb-91    Doug Mitchell at NeXT
        !            30:  *      Created. 
        !            31:  */
        !            32:  
        !            33: #import <bsd/sys/types.h>
        !            34: #import <mach/mach.h>
        !            35: #import <mach/vm_param.h>
        !            36: #import <mach/mach_error.h>
        !            37: #import <bsd/libc.h>
        !            38: #import <driverkit/return.h>
        !            39: #import <driverkit/IODevice.h>
        !            40: #import "IOStub.h"
        !            41: #import "IOStubThread.h"
        !            42: #import "IOStubDevice.h"
        !            43: #import "IOStubUxpr.h"
        !            44: #import <machkit/NXLock.h>
        !            45: 
        !            46: @implementation IOStub(Device)
        !            47: 
        !            48: /*
        !            49:  * These are the methods which actually do the work of this device. All
        !            50:  * of these methods run in the IOStub_thread thread.
        !            51:  */
        !            52: - (void)deviceRead : (IOBuf_t *)IOBuf
        !            53: {
        !            54:        char *source;
        !            55:        u_int block_size;
        !            56:        
        !            57:        xpr_stub("deviceRead:\n", 1,2,3,4,5);
        !            58:        block_size = [self blockSize];
        !            59:        source = stub_data + IOBuf->offset * block_size;
        !            60:        bcopy(source, IOBuf->buf, IOBuf->bytesReq);
        !            61:        IOBuf->status = IO_R_SUCCESS;
        !            62:        if(IOBuf->pending) {
        !            63:                /*
        !            64:                 * Async I/O. Notify client.
        !            65:                 */
        !            66: #if            SUPPORT_ASYNC
        !            67:                [self ioComplete:IOBuf->pending
        !            68:                        dirRead : 1
        !            69:                        status : IO_R_SUCCESS
        !            70:                        bytesXfr : IOBuf->bytesReq];
        !            71:                IOFree(IOBuf, sizeof(*IOBuf));
        !            72: #else          SUPPORT_ASYNC
        !            73:                IOLog("Bogus async request in deviceRead\n");
        !            74:                exit(1);
        !            75: #endif         SUPPORT_ASYNC
        !            76:        }
        !            77:        else {
        !            78:                /*
        !            79:                 * Synchronous I/O. Notify sleeping thread.
        !            80:                 */
        !            81:                *IOBuf->bytesXfr = IOBuf->bytesReq;
        !            82:                [IOBuf->waitLock unlockWith:YES];
        !            83:        }
        !            84: }
        !            85: 
        !            86: - (void)deviceWrite : (IOBuf_t *)IOBuf
        !            87: {
        !            88:        char *dest;
        !            89:        u_int block_size;
        !            90:        
        !            91:        xpr_stub("deviceWrite:\n", 1,2,3,4,5);
        !            92:        block_size = [self blockSize];
        !            93:        dest = stub_data + IOBuf->offset * block_size;
        !            94:        bcopy(IOBuf->buf, dest, IOBuf->bytesReq);
        !            95:        IOBuf->status = IO_R_SUCCESS;
        !            96:        if(IOBuf->pending) {
        !            97: #if            SUPPORT_ASYNC
        !            98:                /*
        !            99:                 * Async I/O. Notify client.
        !           100:                 */
        !           101:                [self ioComplete:IOBuf->pending
        !           102:                        dirRead : 0
        !           103:                        status : IO_R_SUCCESS
        !           104:                        bytesXfr : IOBuf->bytesReq];
        !           105:                IOFree(IOBuf, sizeof(*IOBuf));
        !           106: #else          SUPPORT_ASYNC
        !           107:                IOLog("Bogus async request in deviceZero\n");
        !           108: #endif         SUPPORT_ASYNC
        !           109:        }
        !           110:        else {
        !           111:                /*
        !           112:                 * Synchronous I/O. Notify sleeping thread.
        !           113:                 */
        !           114:                *IOBuf->bytesXfr = IOBuf->bytesReq;
        !           115:                [IOBuf->waitLock unlockWith:YES];
        !           116:        }
        !           117: }
        !           118: 
        !           119: /*
        !           120:  * Zero all of memory. No dispatch for this one...
        !           121:  */
        !           122: - (void)deviceZero : (IOBuf_t *)IOBuf
        !           123: {
        !           124:        u_int block_size;
        !           125:        u_int dev_size;
        !           126:        
        !           127:        xpr_stub("deviceZero:\n", 1,2,3,4,5);
        !           128:        block_size = [self blockSize];
        !           129:        dev_size = [self diskSize];
        !           130:        bzero(stub_data, block_size * dev_size);
        !           131:        IOBuf->status = IO_R_SUCCESS;
        !           132:        if(IOBuf->pending) {
        !           133: #if            SUPPORT_ASYNC
        !           134:                /*
        !           135:                 * Async I/O. Notify client.
        !           136:                 */
        !           137:                [self ioComplete:IOBuf->pending
        !           138:                        dirRead : 1
        !           139:                        status : IO_R_SUCCESS
        !           140:                        bytesXfr : 0];
        !           141:                IOFree(IOBuf, sizeof(*IOBuf));
        !           142: #else          SUPPORT_ASYNC
        !           143:                IOLog("Bogus async request in deviceZero\n");
        !           144: #endif         SUPPORT_ASYNC
        !           145:        }
        !           146:        else {
        !           147:                /*
        !           148:                 * Synchronous I/O. Notify sleeping thread.
        !           149:                 */
        !           150:                [IOBuf->waitLock unlockWith:YES];
        !           151:        }
        !           152: }
        !           153: 
        !           154: 
        !           155: @end
        !           156: 

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