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/i8237.h

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    1 /*
    2  * Intel 8237 DMA Controller
    3  *
    4  * $FreeBSD: src/sys/dev/ic/i8237.h,v 1.8.8.1 2005/03/07 13:10:47 phk Exp $
    5  */
    6 
    7 #define DMA37MD_SINGLE  0x40    /* single pass mode */
    8 #define DMA37MD_CASCADE 0xc0    /* cascade mode */
    9 #define DMA37MD_AUTO    0x50    /* autoinitialise single pass mode */
   10 #define DMA37MD_WRITE   0x04    /* read the device, write memory operation */
   11 #define DMA37MD_READ    0x08    /* write the device, read memory operation */
   12 
   13 #ifndef PC98
   14 #define DMA1_STATUS     (IO_DMA1 + 1*8) /* status register */
   15 #define DMA2_STATUS     (IO_DMA2 + 2*8) /* status register */
   16 #endif

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