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+/* 
+ * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
+ * 
+ * This software may be freely used, copied, modified, and distributed
+ * provided that the above copyright notice is preserved in all copies of the
+ * software.
+ */
+
+/*> angel.h <*/
+/*---------------------------------------------------------------------------*/
+/* This header file is the main holder for the declarations and
+ * prototypes for the core Angel system. Some Angel concepts are
+ * described at the start of this file to ensure that a complete view
+ * of the Angel world can be derived purely from the source.
+ *
+ * $Revision$
+ *     $Date$
+ *
+ *
+ * NOTE: Currently the Angel source is designed to be simple,
+ * understandable and easy to port to new hardware platforms. However,
+ * this does not always yield the highest performing system. The
+ * current layered approach introduces an overhead to the performance
+ * of the system. In a true commercial target, this code should be
+ * re-designed to build a system where the Angel logical message
+ * system, device driver and hardware accesses are merged to provide
+ * the best performance.
+ */
+/*---------------------------------------------------------------------------*/
+/* Angel overview:
+
+... some comments describing Angel ...
+
+ * Angel is designed as a kit-of-parts that can be used to provide
+ * run-time support for the development of ARM applications. The main
+ * core of Angel is in providing support for the "debug" message
+ * communication with a host system. These messages do not just cover
+ * debugging ARM processes, but also the process of downloading ARM
+ * programs or attaching to executing processes on the target.
+ *
+ * A stand-alone ROM based Angel world is the basic starting point for
+ * a system, since it will allow programs to be downloaded to the
+ * target. The ROM version of Angel will provide the generic debug
+ * support, but no system specific routines. The preferred method of
+ * using Angel is as a link library. This ensures that applications
+ * carry with them the Angel routines necessary to support debugging
+ * (and also ensure that the Angel version is up-to-date, independant
+ * of the version in the target ROM). Eventually, once a program has
+ * been fully debugged, a ROMmed version of the program can be
+ * generated with the Angel code being provided in the application.
+
+.. more comments ..
+
+ * The standard Angel routines do *NOT* perform any dynamic memory
+ * allocation. To simplify the source, and aid the porting to a non C
+ * library world, memory is either pre-allocated (as build-time
+ * globals) or actually given to the particular Angel routine by the
+ * active run-time. This ensures that the interaction between Angel
+ * and the target O/S is minimised.
+ *
+ * Notes: We sub-include more header files to keep the source
+ * modular. Since Angel is a kit-of-parts alternative systems may need
+ * to change the prototypes of particular functions, whilst
+ * maintaining a fixed external interface. e.g. using the standard
+ * DEBUG messages, but with a different communications world.
+ */
+/*---------------------------------------------------------------------------*/
+
+#ifndef __angel_h
+#define __angel_h
+
+/*---------------------------------------------------------------------------*/
+/*-- Global Angel definitions and manifests ---------------------------------*/
+/*---------------------------------------------------------------------------*/
+/* When building Angel we may not include the standard library
+ * headers. However, it is useful coding using standard macro names
+ * since it makes the code easier to understand.
+ */
+
+typedef unsigned int  word ;
+typedef unsigned char byte ;
+
+/* The following typedefs can be used to access I/O registers: */
+typedef volatile unsigned int  vuword ;
+typedef volatile unsigned char vubyte ;
+
+/*
+ * The following typedefs are used when defining objects that may also
+ * be created on a host system, where the word size is not
+ * 32bits. This ensures that the same data values are manipulated.
+ */
+#ifdef TARGET
+typedef unsigned int unsigned32;
+typedef signed int   signed32;
+typedef        int   int32;
+
+typedef unsigned short int unsigned16;
+typedef signed   short int signed16;
+
+/*
+ * yet another solution for the bool/boolean problem, this one is
+ * copied from Scott's modifications to clx/host.h
+ */
+# ifdef IMPLEMENT_BOOL_AS_ENUM
+   enum _bool { _false, _true };
+#  define _bool enum _bool
+# elif defined(IMPLEMENT_BOOL_AS_INT) || !defined(__cplusplus)
+#  define _bool int
+#  define _false 0
+#  define _true 1
+# endif
+
+# ifdef _bool
+#  define bool _bool
+# endif
+
+# ifndef true
+#  define true _true
+#  define false _false
+# endif
+
+# ifndef YES
+#  define YES   true
+#  define NO    false
+# endif
+
+# undef TRUE             /* some OSF headers define as 1 */
+# define TRUE  true
+
+# undef FALSE            /* some OSF headers define as 1 */
+# define FALSE false
+
+# ifndef NULL
+#  define NULL 0
+# endif
+
+#else
+
+# include "host.h"
+
+#endif
+
+#ifndef IGNORE
+# define IGNORE(x) ((x)=(x))
+#endif
+
+/* The following typedef allows us to cast between integral and
+ * function pointers. This isn't allowed by direct casting when
+ * conforming to the ANSI spec.
+ */
+typedef union ansibodge
+{
+ word  w ;
+ word *wp ;
+ void *vp ;
+ byte *bp ;
+ void (*vfn)(void) ;
+ word (*wfn)(void) ;
+ int  (*ifn)(void) ;
+ byte (*bfn)(void) ;
+} ansibodge ;
+
+/*---------------------------------------------------------------------------*/
+
+/* The amount setup aside by the run-time system for stack overflow
+ * handlers to execute in. This must be at least 256bytes, since that
+ * value is assumed by the current ARM Ltd compiler.
+ * This space is _only_ kept for the USR stack, not any of the privileged
+ * mode stacks, as stack overflow on these is always fatal - there is
+ * no point attemptingto recover.  In addition is is important that
+ * Angel should keep privileged stack space requirements to a minimum.
+ */
+#define APCS_STACKGUARD 256
+
+#endif /* __angel_h */
+
+/* EOF angel.h */