126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/* memory support for Z8KSIM
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Copyright (C) 1987, 1992 Free Software Foundation, Inc.
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This file is part of Z8KSIM
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Z8KSIM is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Z8KSIM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Z8KZIM; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <ansidecl.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "tm.h"
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#include "mem.h"
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#include "sim.h"
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#define INLINE
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static
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long
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sitoptr (si)
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long si;
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{
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return ((si & 0xff000000) >> 8) | (si & 0xffff);
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}
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static
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unsigned short *
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get_page_and_offset (context, where, offset_ptr)
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sim_state_type *context;
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sim_phys_addr_type where;
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int *offset_ptr;
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{
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/* Is the page allocated ? */
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if (context->memory == 0)
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{
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/* Must allocate 16MB in order to run Z8001 programs. */
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context->memory = (unsigned short *)calloc(64*1024*64,4);
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}
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*offset_ptr = sitoptr(where);
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return context->memory;
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}
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void
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sim_write_byte (context, where, what)
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sim_state_type *context;
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sim_phys_addr_type where;
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int what;
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{
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unsigned int offset;
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char *ptr = (char *)get_page_and_offset (context, where, &offset);
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ptr[offset] = what;
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}
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void
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sim_write_short (context, where, what)
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sim_state_type *context;
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sim_phys_addr_type where;
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int what;
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{
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int offset;
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char *ptr = (char *)get_page_and_offset (context, where, &offset);
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ptr[offset] = what >> 8;
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ptr[offset + 1] = what;
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}
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void
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sim_write_long (context, where, what)
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sim_state_type *context;
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sim_phys_addr_type where;
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int what;
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{
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int offset;
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char *ptr = (char *)get_page_and_offset (context, where, &offset);
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ptr[offset] = what >> 24;
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ptr[offset + 1] = what >> 16;
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ptr[offset + 3] = what >> 8;
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ptr[offset + 4] = what;
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}
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int
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sim_read_byte (context, where)
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sim_state_type *context;
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sim_phys_addr_type where;
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{
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int offset;
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char *ptr = (char *)get_page_and_offset (context, where, &offset);
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return ptr[offset];
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}
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unsigned
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sim_read_short (context, where)
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sim_state_type *context;
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sim_phys_addr_type where;
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{
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int what;
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int offset;
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char *ptr = (char *)get_page_and_offset (context, where, &offset);
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what = (ptr[offset] << 8) | ptr[offset + 1];
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return what;
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}
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