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+/**
+** @file	compat.h
+**
+** @author	Warren R. Carithers
+**
+** @brief	Compatibility definitions for standard modules.
+**
+** These definitions are here to simplify the integration
+** of some pre-written modules into the 452 baseline system.
+** This is used primarily for the 'kmem' and 'sio' modules.
+**
+** We use CPP symbols and not actual data types for things here,
+** as this means we don't need to include any other header files
+** into this file.  This helps get around "include loops" (e.g.,
+** a.h includes b.h, which includes c.h, which includes a.h) when
+** there are many interdependencies between source files.
+*/
+
+#ifndef COMPAT_H_
+#define COMPAT_H_
+
+#include <common.h>
+#include <procs.h>
+
+/*
+** Section 1:  sized integer types
+**
+** Internally, we use standard names for "sized" integer types for
+** simplicity.  If those disagree with the names used in the rest of
+** the system, we take the opportunity to define our names here.
+**
+** To enable these, uncomment them, and place the apropriate
+** existing type names in place of the '?' characters.
+*/
+
+// standard "sized integer" types
+// #define int8_t       ?
+// #define uint8_t      ?
+// #define int16_t      ?
+// #define uint16_t     ?
+// #define int32_t      ?
+// #define uint32_t     ?
+// #define int64_t      ?
+// #define uint64_t     ?
+// #define bool_t       ?
+
+/*
+** Section 2:  other types
+**
+** Add type definitions here as needed.
+**
+** Note:  we do not include the PCB and Queue declarations
+** here because we don't actually need them in this header
+** file - we're only defining CPP macros.  Whatever file
+** uses these macros, however, must include the appropriate
+** headers if it uses these macros.
+**
+** To enable these, uncomment them, and place the apropriate
+** existing type names in place of the '?' characters.
+*/
+
+// type name for the PCB
+#define PCBTYPE pcb_t
+
+// type name for our queue
+#define QTYPE pcb_queue_t
+
+/*
+** Section 3:  interface and behavior
+**
+** Include #define statements here as needed to define
+** the names of functions and globals used in these modules
+** in terms of the names used in the rest of the baseline.
+**
+** To enable these, uncomment them, and place the apropriate
+** existing variable or function names in place of the '?' characters.
+*/
+
+// string functions
+#define SLENGTH strlen
+
+// scheduler
+#define SCHED schedule
+
+// dispatcher
+#define DISPATCH dispatch
+
+/*
+** blocked queue for reading processes
+**
+** Define this if we are blocking processes which try to
+** read from the SIO when no characters are available.
+** Its value should be the name of the globally-visible
+** queue to be used.
+*/
+#define QNAME sioread
+
+#ifdef QNAME
+
+// Only define these macros if we need to be able to create and
+// manage a queue of things. It is expected that these will need
+// to be customized based on the names and calling sequences of
+// the appropriate functions.
+
+// invoke the queue creation function
+// examples:
+//
+// 	#define QCREATE(q)	do {
+// 		_que_create( &(q), NULL );
+//		} while(0)
+//
+//	#define QCREATE(q)	// do nothing
+
+#define QCREATE(q) // handled elsewhere for us
+
+// check to see if the queue is empty
+// examples:
+//
+//	#define QEMPTY(q)	queue_is_empty(q)
+//	#define	QEMPTY(q)	(quene_length(q) > 0)
+#define QEMPTY(q) pcb_queue_empty(q)
+
+// this macro expands into code that removes a value from
+// 'q' and places it into 'd'
+#define QDEQUE(q, d)                                              \
+	do {                                                          \
+		assert(pcb_queue_remove((q), (pcb_t **)&(d)) == SUCCESS); \
+	} while (0)
+
+#endif /* QNAME */
+
+#endif