1 /*
2 * Copyright (C) 2003-2009 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * COMMENT: Color plane mask, used in the DECstation 3100 machine
29 *
30 * Just a one-byte thingy, but the way things work now this has to
31 * be a separate device. :-/
32 */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include "devices.h"
39 #include "memory.h"
40 #include "misc.h"
41
42
43 struct colorplanemask_data {
44 unsigned char *color_plane_mask;
45 };
46
47
DEVICE_ACCESS(colorplanemask)48 DEVICE_ACCESS(colorplanemask)
49 {
50 struct colorplanemask_data *d = (struct colorplanemask_data *) extra;
51
52 switch (relative_addr) {
53
54 case 0x00:
55 if (writeflag == MEM_WRITE) {
56 *d->color_plane_mask = data[0];
57 } else {
58 debug("[ colorplanemask: read isn't actually "
59 "supported ]\n");
60 data[0] = *d->color_plane_mask;
61 }
62 break;
63
64 default:
65 if (writeflag == MEM_WRITE) {
66 debug("[ colorplanemask: unimplemented write "
67 "to address 0x%x, data=0x%02x ]\n",
68 (int)relative_addr, data[0]);
69 } else {
70 debug("[ colorplanemask: unimplemented read "
71 "from address 0x%x ]\n", (int)relative_addr);
72 }
73 }
74
75 /* Pretend it was ok: */
76 return 1;
77 }
78
79
80 /*
81 * dev_colorplanemask_init():
82 */
dev_colorplanemask_init(struct memory * mem,uint64_t baseaddr,unsigned char * color_plane_mask)83 void dev_colorplanemask_init(struct memory *mem, uint64_t baseaddr,
84 unsigned char *color_plane_mask)
85 {
86 struct colorplanemask_data *d;
87
88 CHECK_ALLOCATION(d = (struct colorplanemask_data *)
89 malloc(sizeof(struct colorplanemask_data)));
90 memset(d, 0, sizeof(struct colorplanemask_data));
91
92 d->color_plane_mask = color_plane_mask;
93
94 memory_device_register(mem, "colorplanemask", baseaddr,
95 DEV_COLORPLANEMASK_LENGTH, dev_colorplanemask_access,
96 (void *)d, DM_DEFAULT, NULL);
97 }
98
99