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diff --git a/include/defs.h b/include/defs.h
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+/**
+** @file	defs.h
+**
+** @author	Warren R. Carithers
+**
+** @brief	Common definitions.
+**
+** This header file defines things which are neede by all
+** parts of the system (OS and user levels).
+**
+** Things which are kernel-specific go in the kdefs.h file;
+** things which are user-specific go in the udefs.h file.
+** The correct one of these will be automatically included
+** at the end of this file.
+*/
+
+#ifndef DEFS_H_
+#define DEFS_H_
+
+/*
+** General (C and/or assembly) definitions
+**
+** This section of the header file contains definitions that can be
+** used in either C or assembly-language source code.
+*/
+
+// NULL pointer value
+//
+// we define this the traditional way so that
+// it's usable from both C and assembly
+
+#define NULL                0
+
+// predefined i/o channels
+
+#define CHAN_CIO            0
+#define CHAN_SIO            1
+
+// maximum allowable number of command-line arguments
+#define MAX_ARGS            10
+
+// sizes of various things
+#define NUM_1KB           0x00000400    // 2^10
+#define NUM_4KB           0x00001000    // 2^12
+#define NUM_1MB           0x00100000    // 2^20
+#define NUM_4MB           0x00400000    // 2^22
+#define NUM_1GB           0x40000000    // 2^30
+#define NUM_2GB           0x80000000    // 2^31
+#define NUM_3GB           0xc0000000
+
+#ifndef ASM_SRC
+
+/*
+** Start of C-only definitions
+**
+** Anything that should not be visible to something other than
+** the C compiler should be put here.
+*/
+
+/*
+** System error codes
+**
+** These can be returned to both system functions
+** and to user system calls.
+*/
+	// success!
+#define SUCCESS             (0)
+#   define E_SUCCESS        SUCCESS
+	// generic "something went wrong"
+#define E_FAILURE           (-1)
+	// specific failure reasons
+#define E_BAD_PARAM         (-2)
+#define E_BAD_CHAN          (-3)
+#define E_NO_CHILDREN       (-4)
+#define	E_NO_MEMORY         (-5)
+#define	E_NOT_FOUND         (-6)
+#define E_NO_PROCS          (-7)
+
+/*
+** These error codes are internal to the OS.
+*/
+#define E_EMPTY_QUEUE       (-100)
+#define E_NO_PCBS           (-101)
+#define	E_NO_PTE            (-102)
+#define E_LOAD_LIMIT        (-103)
+
+// exit status values
+#define EXIT_SUCCESS        (0)
+#define EXIT_FAILURE        (-1)
+#define EXIT_KILLED         (-101)
+#define EXIT_BAD_SYSCALL    (-102)
+
+/*
+** Process priority values
+*/
+enum priority_e {
+	PRIO_HIGH, PRIO_STD, PRIO_LOW, PRIO_DEFERRED
+	// sentinel
+	, N_PRIOS
+};
+
+// halves of various data sizes
+
+#define UI16_UPPER		0xff00
+#define UI16_LOWER		0x00ff
+
+#define UI32_UPPER		0xffff0000
+#define UI32_LOWER		0x0000ffff
+
+#define UI64_UPPER		0xffffffff00000000LL
+#define UI64_LOWER		0x00000000ffffffffLL
+
+// Simple conversion pseudo-functions usable by everyone
+
+// convert seconds to ms
+#define SEC_TO_MS(n)	((n) * 1000)
+
+#endif	/* !ASM_SRC */
+
+/*
+** Level-specific definitions
+*/
+#ifdef KERNEL_SRC
+#include <kdefs.h>
+#else
+#include <udefs.h>
+#endif  /* KERNEL_SRC */
+
+#endif