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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [rtems/] [machine/] [param.h] - Rev 859
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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_ */
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