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Annotation of kernel/machdep/i386/dma_internal.h, 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: 
        !            25: /*
        !            26:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            27:  *
        !            28:  * dma_internal.h  -- DMA controller module internal definitions.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 13 July 1992 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35:  
        !            36: #import <architecture/i386/io.h>
        !            37: 
        !            38: #import <machdep/i386/dma.h>
        !            39: 
        !            40: #define DMA_NCHAN              8       // A fundamental constant
        !            41: #define DMA_NCHIPS             2
        !            42: #define DMA_CASCADE_CHAN       4       // Channel is not usable for transfers
        !            43: 
        !            44: struct _dma_chan_port {
        !            45:     io_addr_t          addr;
        !            46:     io_addr_t          page;
        !            47:     io_addr_t          hipage;
        !            48:     io_addr_t          count;
        !            49:     io_addr_t          hicount;
        !            50: };
        !            51: 
        !            52: #define DMA_CHAN_PORT(chan, which) \
        !            53:     ( _dma_chan_port[(chan)].which )
        !            54: 
        !            55: struct _dma_chip_port {
        !            56:     io_addr_t          cmd_status;
        !            57:     io_addr_t          req;
        !            58:     io_addr_t          mask;
        !            59:     io_addr_t          mode;
        !            60:     io_addr_t          clear_ff;
        !            61:     io_addr_t          master_reset;
        !            62:     io_addr_t          extend_mode;
        !            63: };
        !            64: 
        !            65: #define DMA_CHIP_PORT(chan, which) \
        !            66:     ( ((chan) <= 3)? _dma_chip_port[0].which : _dma_chip_port[1].which )
        !            67: 
        !            68: 
        !            69: #define DMA_CHAN_IS_ASSIGNED(chan) \
        !            70:     ( (boolean_t) ((dma_assigned_bits & (1 << (chan))) != 0) )
        !            71: 
        !            72: struct dma_write_regs {
        !            73:     /* dma_cmd_reg_t   cmd; */
        !            74:     dma_mode_reg_t             mode;
        !            75:     dma_extend_mode_reg_t      extend_mode;
        !            76: };
        !            77: 
        !            78: void   dma_buf_initialize(
        !            79:                                void);
        !            80: 
        !            81: extern struct _dma_chan_port   _dma_chan_port[];
        !            82: extern struct _dma_chip_port   _dma_chip_port[];
        !            83: extern unsigned char           dma_assigned_bits;
        !            84: extern struct dma_write_regs   dma_write_regs[];
        !            85: 

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