arm/param.h Kernel.framework

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 __DARWIN_ALIGNBYTES

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.

#define MSIZESHIFT 8

Some macros for units conversion Core clicks (NeXT_page_size bytes) to segments and vice versa

#define ctos(x) (x)

Core clicks (4096 bytes) to disk blocks

#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))

clicks to bytes

#define ctob(x) ((x)<<PGSHIFT)

bytes to clicks

#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)

Map a ``block device block'' to a file system block. This should be device dependent, and will be if we add an entry to cdevsw/bdevsw for that purpose. For now though just use DEV_BSIZE.

#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))

Macros to decode (and encode) processor status word.

#define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))