+/*
+ * tunable variables
+ */
+
+#define NBUF 32 /* size of buffer cache */
+#define NINODE 125 /* number of in core inodes */
+#define NFILE 125 /* number of in core file structures */
+#define NMOUNT 8 /* number of mountable file systems */
+#define MAXMEM 1024 /* max core in 512-byte clicks */
+#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 */
+#define CANBSIZ 256 /* max size of typewriter line */
+#define CMAPSIZ 50 /* size of core allocation area */
+#define SMAPSIZ 50 /* size of swap allocation area */
+#define NCALL 20 /* max simultaneous time callouts */
+#define NPROC 65 /* max number of processes */
+#define NTEXT 40 /* max number of pure texts */
+#define NCLIST 150 /* max total clist size */
+#define HZ 60 /* Ticks/second of the clock */
+#define TIMEZONE (5*60) /* Minutes westward from Greenwich */
+#define DSTFLAG 1 /* Daylight Saving Time applies in this locality */
+#define MSGBUFS 128 /* Characters saved from error messages */
+#define NCARGS 5120 /* # characters in exec arglist */
+#define USRSTACK 0x80000000 /* Start of user stack */
+#define PHYSPAGES 1024 /* number of real memory pages */
+
+/*
+ * priorities
+ * probably should not be
+ * altered too much
+ */
+
+#define PSWP 0
+#define PINOD 10
+#define PRIBIO 20
+#define PZERO 25
+#define NZERO 20
+#define PPIPE 26
+#define PWAIT 30
+#define PSLEP 40
+#define PUSER 50
+
+/*
+ * signals
+ * dont change
+ */
+
+#define NSIG 17
+/*
+ * No more than 16 signals (1-16) because they are
+ * stored in bits in a word.
+ */
+#define SIGHUP 1 /* hangup */
+#define SIGINT 2 /* interrupt (rubout) */
+#define SIGQUIT 3 /* quit (FS) */
+#define SIGINS 4 /* illegal instruction */
+#define SIGTRC 5 /* trace or breakpoint */
+#define SIGIOT 6 /* iot */
+#define SIGEMT 7 /* emt */
+#define SIGFPT 8 /* floating exception */
+#define SIGKIL 9 /* kill, uncatchable termination */
+#define SIGBUS 10 /* bus error */
+#define SIGSEG 11 /* segmentation violation */
+#define SIGSYS 12 /* bad system call */
+#define SIGPIPE 13 /* end of pipe */
+#define SIGCLK 14 /* alarm clock */
+#define SIGTRM 15 /* Catchable termination */
+
+/*
+ * fundamental constants of the implementation--
+ * cannot be changed easily
+ */
+
+#define NBPW sizeof(int) /* number of bytes in an integer */
+#define BSIZE 512 /* size of secondary block (bytes) */
+/* BSLOP can be 0 unless you have a TIU/Spider */
+# define BSLOP 0 /* In case some device needs bigger buffers */
+#define NINDIR (BSIZE/sizeof(daddr_t))
+#define BMASK 0777 /* BSIZE-1 */
+#define BSHIFT 9 /* LOG2(BSIZE) */
+#define NMASK 0177 /* NINDIR-1 */
+#define NSHIFT 7 /* LOG2(NINDIR) */
+#define USIZE (4 + u.u_pcb.pcb_szpt) /* size of user block (*512) */
+#define UBASE (0x80000000 + PHYSPAGES*512) /* abs. addr of user block */
+#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 NICINOD 100 /* number of superblock inodes */
+#define NICFREE 50 /* number of superblock free blocks */
+#define CBSIZE 12 /* number of chars in a clist block */
+#define CROUND 0xF /* clist rounding; sizeof(int *) + CBSIZE -1*/
+#define CLKTICK 16667 /* microseconds in a clock tick */
+
+/*
+ * 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)
+
+/* inumber to disk address */
+#define itod(x) (daddr_t)((((unsigned)x+15)>>3))
+
+/* inumber to disk offset */
+#define itoo(x) (int)((x+15)&07)
+
+/* clicks to bytes */
+#define ctob(x) (x<<9)
+
+/* bytes to clicks */
+#define btoc(x) ((((unsigned)x+511)>>9))
+
+/* major part of a device */
+#define major(x) (int)(((unsigned)x>>8)&0377)
+
+/* minor part of a device */
+#define minor(x) (int)(x&0377)
+
+/* make a device number */
+#define makedev(x,y) (dev_t)(((x)<<8) | (y))
+
+typedef struct { int r[1]; } * physadr;
+typedef int daddr_t;
+typedef char * caddr_t;
+typedef unsigned short ino_t;
+typedef int time_t;
+typedef int label_t[10];
+typedef short dev_t;
+typedef int off_t;
+
+/*
+ * Machine-dependent bits and macros
+ */
+#define UMODE PSL_CURMOD /* usermode bits */
+#define USERMODE(ps) ((ps & UMODE) == UMODE)
+
+#define BASEPRI(ps) ((ps & PSL_IPL) != 0)
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