1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* spec16.c: Spectrum 16K specific routines
Copyright (c) 1999-2011 Philip Kendall
$Id: spec16.c 4638 2012-01-21 12:52:14Z fredm $
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <libspectrum.h>
#include "machine.h"
#include "machines.h"
#include "machines_periph.h"
#include "memory.h"
#include "periph.h"
#include "settings.h"
#include "spec48.h"
static int spec16_reset( void );
static memory_page empty_mapping[MEMORY_PAGES_IN_16K];
static int empty_mapping_allocated = 0;
int spec16_init( fuse_machine_info *machine )
{
machine->machine = LIBSPECTRUM_MACHINE_16;
machine->id = "16";
machine->reset = spec16_reset;
machine->timex = 0;
machine->ram.port_from_ula = spec48_port_from_ula;
machine->ram.contend_delay = spectrum_contend_delay_65432100;
machine->ram.contend_delay_no_mreq = spectrum_contend_delay_65432100;
machine->ram.valid_pages = 1;
machine->unattached_port = spectrum_unattached_port;
machine->shutdown = NULL;
machine->memory_map = spec48_memory_map;
return 0;
}
static void
ensure_empty_mapping( void )
{
int i;
if( empty_mapping_allocated ) return;
libspectrum_byte *empty_chunk = memory_pool_allocate_persistent( 0x4000, 1 );
memset( empty_chunk, 0xff, 0x4000 );
for( i = 0; i < MEMORY_PAGES_IN_16K; i++ ) {
memory_page *page = &empty_mapping[i];
page->page = empty_chunk + i * MEMORY_PAGE_SIZE;
page->writable = 0;
page->contended = 0;
page->source = memory_source_none;
}
empty_mapping_allocated = 1;
}
static int
spec16_reset( void )
{
int error;
error = machine_load_rom( 0, settings_current.rom_16,
settings_default.rom_16, 0x4000 );
if( error ) return error;
ensure_empty_mapping();
periph_clear();
machines_periph_48();
periph_update();
/* The one RAM page is contended */
memory_ram_set_16k_contention( 5, 1 );
memory_map_16k( 0x0000, memory_map_rom, 0 );
memory_map_16k( 0x4000, memory_map_ram, 5 );
memory_map_16k( 0x8000, empty_mapping, 0 );
memory_map_16k( 0xc000, empty_mapping, 0 );
memory_current_screen = 5;
memory_screen_mask = 0xffff;
spec48_common_display_setup();
return 0;
}
|
