+/* param.h 4.16 82/03/30 */
+
+/*
+ * Tunable variables which do not usually vary per system.
+ *
+ * The sizes of most system tables are configured
+ * into each system description. The file system buffer
+ * cache size is assigned based on available memory.
+ * The tables whose sizes don't vary often are given here.
+ */
+
+#define NMOUNT 15 /* number of mountable file systems */
+#define MSWAPX 15 /* pseudo mount table index for swapdev */
+#define MAXUPRC 25 /* max processes per user */
+#define SSIZE 4 /* initial stack size (*512 bytes) */
+#define SINCR 4 /* increment of stack (*512 bytes) */
+#define NOFILE 20 /* max open files per process */
+/* NOFILE MUST NOT BE >= 31; SEE pte.h */
+#define CANBSIZ 256 /* max size of typewriter line */
+#define NCARGS 10240 /* # characters in exec arglist */
+
+/*
+ * priorities
+ * probably should not be
+ * altered too much
+ */
+
+#define PSWP 0
+#define PINOD 10
+#define PRIBIO 20
+#define PRIUBA 24
+#define PZERO 25
+#define PPIPE 26
+#define PWAIT 30
+#define PSLEP 40
+#define PUSER 50
+
+#define NZERO 20
+
+/*
+ * signals
+ * dont change
+ */
+
+#ifndef NSIG
+#include "../signal.h"
+#endif
+
+/*
+ * Return values from tsleep().
+ */
+#define TS_OK 0 /* normal wakeup */
+#define TS_TIME 1 /* timed-out wakeup */
+#define TS_SIG 2 /* asynchronous signal wakeup */
+
+/*
+ * fundamental constants of the implementation--
+ * cannot be changed easily.
+ */
+
+#define NBBY 8 /* number of bits in a byte */
+#define NBPW sizeof(int) /* number of bytes in an integer */
+#define NBPG 512
+#define PGOFSET (NBPG-1) /* byte offset into page */
+#define PGSHIFT 9 /* LOG2(NBPG) */
+
+#define UPAGES 8 /* pages of u-area */
+#define NULL 0
+#define CMASK 0 /* default mask for file creation */
+#define NODEV (dev_t)(-1)
+#define ROOTINO ((ino_t)2) /* i number of all roots */
+#define SUPERB ((daddr_t)1) /* block number of the super block */
+#define DIRSIZ 14 /* max characters per directory */
+#define NGRPS 256 /* max number groups */
+
+/*
+ * Clustering of hardware pages on machines with ridiculously small
+ * page sizes is done here. The paging subsystem deals with units of
+ * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must
+ * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
+ * deals with the same size blocks that the file system uses.
+ *
+ * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
+ */
+#define CLSIZE 2
+#define CLBYTES (CLSIZE*NBPG)
+#define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
+#define claligned(x) ((((int)(x))&CLOFSET)==0)
+#define CLOFF CLOFSET
+#define CLSHIFT (PGSHIFT+1)
+
+/* give the base virtual address (first of CLSIZE) */
+#define clbase(i) ((i) &~ (CLSIZE-1))
+
+/* round a number of clicks up to a whole cluster */
+#define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
+
+#define DEV_BSIZE 512
+#if CLSIZE==1
+#define BSIZE 512 /* size of secondary block (bytes) */
+#define INOPB 8 /* 8 inodes per block */
+#define BMASK 0777 /* BSIZE-1 */
+#define BSHIFT 9 /* LOG2(BSIZE) */
+#define NMASK 0177 /* NINDIR-1 */
+#define NSHIFT 7 /* LOG2(NINDIR) */
+#define NICINOD 100 /* number of superblock inodes */
+#define NICFREE 50 /* number of superblock free blocks */
+
+#endif
+
+#if CLSIZE==2
+#define BSIZE 1024
+#define INOPB 16
+#define BMASK 01777
+#define BSHIFT 10
+#define NMASK 0377
+#define NSHIFT 8
+#define NICINOD 100
+#define NICFREE 178
+#endif
+
+#if CLSIZE==4
+#define BSIZE 2048
+#define INOPB 32
+#define BMASK 03777
+#define BSHIFT 11
+#define NMASK 0777
+#define NSHIFT 9
+#define NICINOD 100
+#define NICFREE 434
+#endif
+
+#ifndef INTRLVE
+/* macros replacing interleaving functions */
+#define dkblock(bp) ((bp)->b_blkno)
+#define dkunit(bp) (minor((bp)->b_dev) >> 3)
+#endif
+
+/* inumber to disk address and inumber to disk offset */
+#define itod(x) ((daddr_t)((((unsigned)(x)+2*INOPB-1)/INOPB)))
+#define itoo(x) ((int)(((x)+2*INOPB-1)%INOPB))
+
+/* file system blocks to disk blocks and back */
+#define fsbtodb(b) ((b)*CLSIZE)
+#define dbtofsb(b) ((b)/CLSIZE)
+
+#define NINDIR (BSIZE/sizeof(daddr_t))
+
+#define CBSIZE 28 /* number of chars in a clist block */
+#define CROUND 0x1F /* clist rounding; sizeof(int *) + CBSIZE -1*/
+
+/*
+ * Macros for fast min/max
+ */
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+
+/*
+ * Some macros for units conversion
+ */
+/* Core clicks (512 bytes) to segments and vice versa */
+#define ctos(x) (x)
+#define stoc(x) (x)
+
+/* Core clicks (512 bytes) to disk blocks */
+#define ctod(x) (x)
+
+/* clicks to bytes */
+#define ctob(x) ((x)<<9)
+
+/* bytes to clicks */
+#define btoc(x) ((((unsigned)(x)+511)>>9))
+
+#ifndef KERNEL
+#include "types.h"
+#else
+#include "../h/types.h"
+#endif
+
+/*
+ * Machine-dependent bits and macros
+ */
+#define UMODE PSL_CURMOD /* usermode bits */
+#define USERMODE(ps) (((ps) & UMODE) == UMODE)
+
+#define BASEPRI(ps) (((ps) & PSL_IPL) != 0)
+
+/*
+ * Provide about n microseconds of delay
+ */
+#define DELAY(n) { register int N = (n); while (--N > 0); }
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