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Annotation of driverkit/libDriver/Kernel/IOMallocLow.m, revision 1.1.1.1

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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