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/*

 *  $Id: param.h 207 2010-07-19 17:43:24Z jeremybennett $

 */

#ifndef _MACHINE_PARAM_H_

#define _MACHINE_PARAM_H_

/*

 * These aren't really machine-dependent for RTEMS.....

 */

/*

#define MACHINE         "i386"

#define MID_MACHINE     MID_I386

*/

/*

 * Round p (pointer or byte index) up to a correctly-aligned value

 * for all data types (int, long, ...).   The result is unsigned int

 * and must be cast to any desired pointer type.

 */

#if defined(__sparc__)

#define ALIGNBYTES      (sizeof(double) - 1)

#else

#define ALIGNBYTES      (sizeof(int) - 1)

#endif

#define ALIGN(p)        (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)

#define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */

#define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */

#define PAGE_MASK       (PAGE_SIZE-1)

#define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))

#define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))

#define PDRSHIFT        22              /* LOG2(NBPDR) */

#define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */

#define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */

#define DEV_BSIZE       (1<<DEV_BSHIFT)

#if defined(__AVR__) || defined(__h8300__)

#define BLKDEV_IOSIZE   1024

#define MAXPHYS         (1 * 1024)      /* max raw I/O transfer size */

#else

#define BLKDEV_IOSIZE   2048

#define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */

#endif

#define UPAGES  2               /* pages of u-area */

/*

 * Constants related to network buffer management.

 * MCLBYTES must be no larger than CLBYTES (the software page size), and,

 * on machines that exchange pages of input or output buffers with mbuf

 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple

 * of the hardware page size.

 */

#ifndef MSIZE

#define MSIZE           128             /* size of an mbuf */

#endif  /* MSIZE */

#ifndef MCLSHIFT

#define MCLSHIFT        11              /* convert bytes to m_buf clusters */

#endif  /* MCLSHIFT */

#define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */

#define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */

/*

 * Some macros for units conversion

 */

/* clicks to bytes */

#define ctob(x) ((x)<<PAGE_SHIFT)

/* bytes to clicks */

#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)

/*

 * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We

 * want to shift an unsigned type to avoid sign extension and we don't

 * want to widen `bytes' unnecessarily.  Assume that the result fits in

 * a daddr_t.

 */

#define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \

        (sizeof (bytes) > sizeof(long) \

         ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \

         : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))

#define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \

        ((off_t)(db) << DEV_BSHIFT)

/*

 * Mach derived conversion macros

 */

#define trunc_page(x)           ((unsigned)(x) & ~PAGE_MASK)

#define round_page(x)           ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK)

#define atop(x)                 ((unsigned)(x) >> PAGE_SHIFT)

#define ptoa(x)                 ((unsigned)(x) << PAGE_SHIFT)

#endif /* !_MACHINE_PARAM_H_ */