| /* |
| * $Id: param.h,v 1.4 2009/12/16 21:35:51 jjohnstn Exp $ |
| */ |
| |
| #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_ */ |