source: rtems/cpukit/libnetworking/machine/param.h @ 96b39164

4.104.114.84.95
Last change on this file since 96b39164 was 96b39164, checked in by Joel Sherrill <joel.sherrill@…>, on Aug 20, 1998 at 9:56:40 PM

Added CVS Ids

  • Property mode set to 100644
File size: 2.6 KB
Line 
1/*
2 *  $Id$
3 */
4
5#ifndef _MACHINE_PARAM_H_
6#define _MACHINE_PARAM_H_
7
8/*
9 * These aren't really machine-dependent for RTEMS.....
10 */
11
12/*
13#define MACHINE         "i386"
14#define MID_MACHINE     MID_I386
15*/
16
17/*
18 * Round p (pointer or byte index) up to a correctly-aligned value
19 * for all data types (int, long, ...).   The result is unsigned int
20 * and must be cast to any desired pointer type.
21 */
22#define ALIGNBYTES      (sizeof(int) - 1)
23#define ALIGN(p)        (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)
24
25#define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
26#define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
27#define PAGE_MASK       (PAGE_SIZE-1)
28#define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
29
30#define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
31#define PDRSHIFT        22              /* LOG2(NBPDR) */
32#define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
33
34#define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
35#define DEV_BSIZE       (1<<DEV_BSHIFT)
36
37#define BLKDEV_IOSIZE   2048
38#define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
39
40#define UPAGES  2               /* pages of u-area */
41
42/*
43 * Constants related to network buffer management.
44 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
45 * on machines that exchange pages of input or output buffers with mbuf
46 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
47 * of the hardware page size.
48 */
49#ifndef MSIZE
50#define MSIZE           128             /* size of an mbuf */
51#endif  /* MSIZE */
52
53#ifndef MCLSHIFT
54#define MCLSHIFT        11              /* convert bytes to m_buf clusters */
55#endif  /* MCLSHIFT */
56#define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */
57#define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */
58
59/*
60 * Some macros for units conversion
61 */
62
63/* clicks to bytes */
64#define ctob(x) ((x)<<PAGE_SHIFT)
65
66/* bytes to clicks */
67#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
68
69/*
70 * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
71 * want to shift an unsigned type to avoid sign extension and we don't
72 * want to widen `bytes' unnecessarily.  Assume that the result fits in
73 * a daddr_t.
74 */
75#define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
76        (sizeof (bytes) > sizeof(long) \
77         ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
78         : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
79
80#define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
81        ((off_t)(db) << DEV_BSHIFT)
82
83/*
84 * Mach derived conversion macros
85 */
86#define trunc_page(x)           ((unsigned)(x) & ~PAGE_MASK)
87#define round_page(x)           ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK)
88
89#define atop(x)                 ((unsigned)(x) >> PAGE_SHIFT)
90#define ptoa(x)                 ((unsigned)(x) << PAGE_SHIFT)
91
92#endif /* !_MACHINE_PARAM_H_ */
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