1 /* memory support for Z8KSIM
2 Copyright (C) 1987, 1992 Free Software Foundation, Inc.
4 This file is part of Z8KSIM
6 Z8KSIM is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 Z8KSIM is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Z8KZIM; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
38 return ((si
& 0xff000000) >> 8) | (si
& 0xffff);
43 get_page_and_offset (context
, where
, offset_ptr
)
44 sim_state_type
*context
;
45 sim_phys_addr_type where
;
48 /* Is the page allocated ? */
50 if (context
->memory
== 0)
52 /* Must allocate 16MB in order to run Z8001 programs. */
53 context
->memory
= (unsigned short *)calloc(64*1024*64,4);
56 *offset_ptr
= sitoptr(where
);
57 return context
->memory
;
61 sim_write_byte (context
, where
, what
)
62 sim_state_type
*context
;
63 sim_phys_addr_type where
;
67 char *ptr
= (char *)get_page_and_offset (context
, where
, &offset
);
73 sim_write_short (context
, where
, what
)
74 sim_state_type
*context
;
75 sim_phys_addr_type where
;
79 char *ptr
= (char *)get_page_and_offset (context
, where
, &offset
);
81 ptr
[offset
] = what
>> 8;
82 ptr
[offset
+ 1] = what
;
86 sim_write_long (context
, where
, what
)
87 sim_state_type
*context
;
88 sim_phys_addr_type where
;
92 char *ptr
= (char *)get_page_and_offset (context
, where
, &offset
);
94 ptr
[offset
] = what
>> 24;
95 ptr
[offset
+ 1] = what
>> 16;
96 ptr
[offset
+ 3] = what
>> 8;
97 ptr
[offset
+ 4] = what
;
101 sim_read_byte (context
, where
)
102 sim_state_type
*context
;
103 sim_phys_addr_type where
;
106 char *ptr
= (char *)get_page_and_offset (context
, where
, &offset
);
112 sim_read_short (context
, where
)
113 sim_state_type
*context
;
114 sim_phys_addr_type where
;
119 char *ptr
= (char *)get_page_and_offset (context
, where
, &offset
);
121 what
= (ptr
[offset
] << 8) | ptr
[offset
+ 1];
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