84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* dve.c -- I/O code for the Densan DVE-R3900 board.
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*
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* Copyright (c) 1998, 1999 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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/* Flag indicating that we are being debugged by GDB. If set,
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preceded each character output to the console with a ^O,
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so that GDB will print it instead of discarding it. */
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int output_debug = 1;
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/* Monitor "ci" function (console input) */
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typedef int (*cifunc)(int waitflag);
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#ifdef __mips64
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static cifunc ci = (cifunc) 0xffffffffbfc00010L;
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#else
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static cifunc ci = (cifunc) 0xbfc00010;
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#endif
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#define WAIT 1
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#define NOWAIT 0
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#define NOCHAR (-1)
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/* Monitor "co" function (console output) */
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typedef void (*cofunc)(int c);
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#ifdef __mips64
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static cofunc co = (cofunc) 0xffffffffbfc00018L;
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#else
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static cofunc co = (cofunc) 0xbfc00018;
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#endif
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/* outbyte -- shove a byte out the serial port; used by write.c. */
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int
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outbyte(byte)
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unsigned char byte;
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{
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/* Output a ^O prefix so that GDB won't discard the output. */
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if (output_debug)
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co (0x0f);
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co (byte);
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return byte;
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}
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/* inbyte -- get a byte from the serial port; used by read.c. */
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unsigned char
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inbyte()
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{
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return (unsigned char) ci (WAIT);
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}
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/* Structure filled in by get_mem_info. Only the size field is
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actually used (by sbrk), so the others aren't even filled in. */
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struct s_mem
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{
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unsigned int size;
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unsigned int icsize;
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unsigned int dcsize;
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};
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void
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get_mem_info (mem)
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struct s_mem *mem;
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{
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mem->size = 0x1000000; /* DVE-R3900 board has 16 MB of RAM */
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}
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