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hellwig |
% This file is part of the MMIXware package (c) Donald E Knuth 1999
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@i boilerplate.w %<< legal stuff: PLEASE READ IT BEFORE MAKING ANY CHANGES!
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\def\title{MMIX-MEM}
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\def\MMIX{\.{MMIX}}
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\def\Hex#1{\hbox{$^{\scriptscriptstyle\#}$\tt#1}} % experimental hex constant
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@s octa int
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@* Memory-mapped input and output. This module supplies procedures for reading
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@^I/O@>
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@^input/output@>
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@^memory-mapped input/output@>
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and writing \MMIX\ memory addresses that exceed 48 bits. Such addresses are
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used by the operating system for input and output, so they require special
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treatment. At present only dummy versions of these routines are implemented.
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Users who need nontrivial versions of |spec_read| and/or |spec_write| should
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prepare their own and link them with the rest of the simulator.
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@p
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#include
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#include "mmix-pipe.h" /* header file for all modules */
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extern octa read_hex(); /* found in the main program module */
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static char buf[20];
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@ If the |interactive_read_bit| of the |verbose| control is set,
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the user is supposed to supply values dynamically. Otherwise
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zero is read.
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@p
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octa spec_read @,@,@[ARGS((octa))@];@+@t}\6{@>
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octa spec_read(addr)
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octa addr;
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{
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octa val;
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if (verbose&interactive_read_bit) {
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printf("** Read from loc %08x%08x: ",addr.h,addr.l);
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fgets(buf,20,stdin);
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val=read_hex(buf);
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} else val.l=val.h=0;
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if (verbose&show_spec_bit)
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printf(" (spec_read %08x%08x from %08x%08x at time %d)\n",
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val.h,val.l,addr.h,addr.l,ticks.l);
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return val;
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}
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@ The default |spec_write| just reports its arguments, without actually
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writing anything.
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@p
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void spec_write @,@,@[ARGS((octa,octa))@];@+@t}\6{@>
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void spec_write(addr,val)
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octa addr,val;
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{
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if (verbose&show_spec_bit)
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printf(" (spec_write %08x%08x to %08x%08x at time %d)\n",
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val.h,val.l,addr.h,addr.l,ticks.l);
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}
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@* Index.
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