98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
|
|
* $Id$
|
|
*/
|
|
|
|
#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.
|
|
*/
|
|
#define ALIGNBYTES (sizeof(int) - 1)
|
|
#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_ */
|