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Annotation of kernel/machdep/i386/dma_internal.h, 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: 
                     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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