The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/i8237reg.h

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    1 /*      $NetBSD: i8237reg.h,v 1.8 2005/12/11 12:21:26 christos Exp $    */
    2 
    3 /*
    4  * Intel 8237 DMA Controller
    5  */
    6 
    7 #define DMA37MD_WRITE   0x04    /* read the device, write memory operation */
    8 #define DMA37MD_READ    0x08    /* write the device, read memory operation */
    9 #define DMA37MD_LOOP    0x10    /* auto-initialize mode */
   10 #define DMA37MD_DEMAND  0x00    /* demand mode */
   11 #define DMA37MD_SINGLE  0x40    /* single mode */
   12 #define DMA37MD_BLOCK   0x80    /* block mode */
   13 #define DMA37MD_CASCADE 0xc0    /* cascade mode */
   14 
   15 #define DMA37SM_CLEAR   0x00    /* clear mask bit */
   16 #define DMA37SM_SET     0x04    /* set mask bit */

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