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[/] [or1k_old/] [tags/] [tn_m001/] [gdb-5.0/] [sim/] [z8k/] [mem.c] - Rev 1782
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/* memory support for Z8KSIM Copyright (C) 1987, 1992 Free Software Foundation, Inc. This file is part of Z8KSIM Z8KSIM is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. Z8KSIM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Z8KZIM; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include <ansidecl.h> #ifdef HAVE_STDLIB_H #include <stdlib.h> #endif #include "tm.h" #include "mem.h" #include "sim.h" #define INLINE static long sitoptr (si) long si; { return ((si & 0xff000000) >> 8) | (si & 0xffff); } static unsigned short * get_page_and_offset (context, where, offset_ptr) sim_state_type *context; sim_phys_addr_type where; int *offset_ptr; { /* Is the page allocated ? */ if (context->memory == 0) { /* Must allocate 16MB in order to run Z8001 programs. */ context->memory = (unsigned short *)calloc(64*1024*64,4); } *offset_ptr = sitoptr(where); return context->memory; } void sim_write_byte (context, where, what) sim_state_type *context; sim_phys_addr_type where; int what; { unsigned int offset; char *ptr = (char *)get_page_and_offset (context, where, &offset); ptr[offset] = what; } void sim_write_short (context, where, what) sim_state_type *context; sim_phys_addr_type where; int what; { int offset; char *ptr = (char *)get_page_and_offset (context, where, &offset); ptr[offset] = what >> 8; ptr[offset + 1] = what; } void sim_write_long (context, where, what) sim_state_type *context; sim_phys_addr_type where; int what; { int offset; char *ptr = (char *)get_page_and_offset (context, where, &offset); ptr[offset] = what >> 24; ptr[offset + 1] = what >> 16; ptr[offset + 3] = what >> 8; ptr[offset + 4] = what; } int sim_read_byte (context, where) sim_state_type *context; sim_phys_addr_type where; { int offset; char *ptr = (char *)get_page_and_offset (context, where, &offset); return ptr[offset]; } unsigned sim_read_short (context, where) sim_state_type *context; sim_phys_addr_type where; { int what; int offset; char *ptr = (char *)get_page_and_offset (context, where, &offset); what = (ptr[offset] << 8) | ptr[offset + 1]; return what; }