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Annotation of driverkit/libDriver/Kernel/IOMallocLow.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: /*     Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved. 
        !            25:  *
        !            26:  * IOMallocLow.m - IOMallocLow(), IOFreeLow() for i386. 
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 01-Apr-93    Doug Mitchell at NeXT
        !            30:  *      Created.
        !            31:  */
        !            32: 
        !            33: #import <driverkit/i386/kernelDriver.h> 
        !            34: #import <mach/vm_param.h>
        !            35: #import <kernserv/queue.h>
        !            36: #import <machdep/i386/dma_exported.h>
        !            37: #import <driverkit/generalFuncs.h>
        !            38: 
        !            39: queue_head_t dmaBufQueue;
        !            40: 
        !            41: /*
        !            42:  * Need to keep dma_buf_t's around for IOFreeLow().
        !            43:  */
        !            44: typedef struct {
        !            45:        dma_buf_t       *buf;
        !            46:        queue_chain_t   link;
        !            47: } low16Buf;
        !            48: 
        !            49: 
        !            50: void *IOMallocLow(int size)
        !            51: {
        !            52:        boolean_t brtn;
        !            53:        dma_buf_t *buf;
        !            54:        low16Buf *lowBuf;
        !            55:        
        !            56:        buf = IOMalloc(sizeof(*buf));
        !            57:        brtn = dma_buf_alloc(buf, size);
        !            58:        if(brtn == FALSE) {
        !            59:                IOFree(buf, sizeof(*buf));
        !            60:                return 0;
        !            61:        }
        !            62:        
        !            63:        /*
        !            64:         * Enqueue this on dmaBufQueue.
        !            65:         */
        !            66:        lowBuf = IOMalloc(sizeof(*lowBuf));
        !            67:        lowBuf->buf = buf;
        !            68:        queue_enter(&dmaBufQueue, lowBuf, low16Buf *, link);
        !            69:        return buf->_ptr;
        !            70: }
        !            71: 
        !            72: void IOFreeLow(void *p, int size)
        !            73: {
        !            74:        low16Buf *lowBuf;
        !            75: 
        !            76:        /*
        !            77:         * Find the associated low16Buf.
        !            78:         */
        !            79:        lowBuf = (low16Buf *)queue_first(&dmaBufQueue);
        !            80:        while(!queue_end(&dmaBufQueue, (queue_t)lowBuf)) {
        !            81:                if(lowBuf->buf->_ptr == p) {
        !            82:                        queue_remove(&dmaBufQueue, lowBuf, low16Buf *, link);
        !            83:                        dma_buf_free(lowBuf->buf);
        !            84:                        IOFree(lowBuf->buf, sizeof(*lowBuf->buf));
        !            85:                        IOFree(lowBuf, sizeof(*lowBuf));
        !            86:                        return;
        !            87:                }
        !            88:                lowBuf = (low16Buf *)lowBuf->link.next;
        !            89:        }
        !            90:        IOLog("IOFreeLow: buf 0x%x not found\n", (unsigned)p);
        !            91: }
        !            92: 

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