/[gxemul]/trunk/src/devices/dev_bt455.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Annotation of /trunk/src/devices/dev_bt455.c

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Revision 18 - (hide annotations)
Mon Oct 8 16:19:11 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 5622 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1004 2005/10/27 14:01:10 debug Exp $
20051011        Passing -A as the default boot arg for CATS (works fine with
                OpenBSD/cats).
20051012	Fixing the VGA cursor offset bug, and speeding up framebuffer
		redraws if character cells contain the same thing as during
		the last redraw.
20051013	Adding a slow strd ARM instruction hack.
20051017	Minor updates: Adding a dummy i80321 Verde controller (for
		XScale emulation), fixing the disassembly of the ARM "ldrd"
		instruction, adding "support" for less-than-4KB pages for ARM
		(by not adding them to translation tables).
20051020	Continuing on some HPCarm stuff. A NetBSD/hpcarm kernel prints
		some boot messages on an emulated Jornada 720.
		Making dev_ram work better with dyntrans (speeds up some things
		quite a bit).
20051021	Automatically generating some of the most common ARM load/store
		multiple instructions.
20051022	Better statistics gathering for the ARM load/store multiple.
		Various other dyntrans and device updates.
20051023	Various minor updates.
20051024	Continuing; minor device and dyntrans fine-tuning. Adding the
		first "reasonable" instruction combination hacks for ARM (the
		cores of NetBSD/cats' memset and memcpy).
20051025	Fixing a dyntrans-related bug in dev_vga. Also changing the
		dyntrans low/high access notification to only be updated on
		writes, not reads. Hopefully it will be enough. (dev_vga in
		charcell mode now seems to work correctly with both reads and
		writes.)
		Experimenting with gathering dyntrans statistics (which parts
		of emulated RAM that are actually executed), and adding
		instruction combination hacks for cache cleaning and a part of
		NetBSD's scanc() function.
20051026	Adding a bitmap for ARM emulation which indicates if a page is
		(specifically) user accessible; loads and stores with the t-
		flag set can now use the translation arrays, which results in
		a measurable speedup.
20051027	Dyntrans updates; adding an extra bitmap array for 32-bit
		emulation modes, speeding up the check whether a physical page
		has any code translations or not (O(n) -> O(1)). Doing a
		similar reduction of O(n) to O(1) by avoiding the scan through
		the translation entries on a translation update (32-bit mode
		only).
		Various other minor hacks.
20051029	Quick release, without any testing at all.

==============  RELEASE 0.3.6.2  ==============
1 dpavlin 4 /*
2     * Copyright (C) 2004-2005 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 dpavlin 18 * $Id: dev_bt455.c,v 1.8 2005/10/26 14:37:03 debug Exp $
29 dpavlin 4 *
30     * Brooktree 455, used by TURBOchannel graphics cards.
31     *
32     * TODO: This is hardcoded to only use 16 grayscales, using only the
33     * green component of the palette. Perhaps some other graphics card uses
34     * the BT455 as well; if so then this device must be re-hacked.
35     */
36    
37     #include <stdio.h>
38     #include <stdlib.h>
39     #include <string.h>
40    
41     #include "devices.h"
42     #include "memory.h"
43     #include "misc.h"
44    
45    
46    
47     struct bt455_data {
48     unsigned char addr_cmap;
49     unsigned char addr_cmap_data;
50     unsigned char addr_clr;
51     unsigned char addr_ovly;
52    
53     int cur_rgb_offset;
54    
55     struct vfb_data *vfb_data;
56     unsigned char *rgb_palette; /* ptr to 256 * 3 (r,g,b) */
57     };
58    
59    
60     /*
61     * dev_bt455_access():
62     */
63     int dev_bt455_access(struct cpu *cpu, struct memory *mem,
64     uint64_t relative_addr, unsigned char *data, size_t len,
65     int writeflag, void *extra)
66     {
67     struct bt455_data *d = (struct bt455_data *) extra;
68     uint64_t idata = 0, odata = 0;
69     int i, modified;
70    
71 dpavlin 18 if (writeflag == MEM_WRITE)
72     idata = memory_readmax64(cpu, data, len);
73 dpavlin 4
74     /* Read from/write to the bt455: */
75     switch (relative_addr) {
76     case 0x00: /* addr_cmap */
77     if (writeflag == MEM_WRITE) {
78     debug("[ bt455: write to addr_cmap, 0x%02x ]\n", idata);
79     d->addr_cmap = idata;
80     d->cur_rgb_offset = (d->addr_cmap & 0xf) * 3;
81     } else {
82     odata = d->addr_cmap;
83     debug("[ bt455: read from addr_cmap: 0x%0x ]\n", odata);
84     }
85     break;
86     case 0x04: /* addr_cmap_data */
87     if (writeflag == MEM_WRITE) {
88     debug("[ bt455: write to addr_cmap_data, 0x%02x ]\n",
89     (int)idata);
90     d->addr_cmap_data = idata;
91    
92     modified = 0;
93    
94     /* Only write on updates to the Green value: */
95     if ((d->cur_rgb_offset % 3) == 1) {
96     /* Update 16 copies: */
97     for (i=0; i<16; i++) {
98     int addr = (d->cur_rgb_offset + 16*i)
99     % 0x300;
100     int newvalue = idata * 0x11;
101    
102     if (d->rgb_palette[(addr / 3) * 3 + 0]
103     != newvalue ||
104     d->rgb_palette[(addr / 3) * 3 + 1]
105     != newvalue ||
106     d->rgb_palette[(addr / 3) * 3 + 2]
107     != newvalue)
108     modified = 1;
109    
110     d->rgb_palette[(addr / 3) * 3 + 0] =
111     d->rgb_palette[(addr / 3) * 3 + 1] =
112     d->rgb_palette[(addr / 3) * 3 + 2] =
113     newvalue;
114     }
115     }
116    
117     if (modified) {
118     d->vfb_data->update_x1 = 0;
119     d->vfb_data->update_x2 = d->vfb_data->xsize - 1;
120     d->vfb_data->update_y1 = 0;
121     d->vfb_data->update_y2 = d->vfb_data->ysize - 1;
122     }
123    
124     /* Advance to next palette byte: */
125     d->cur_rgb_offset ++;
126     } else {
127     odata = d->addr_cmap_data;
128     debug("[ bt455: read from addr_cmap_data: 0x%0x ]\n",
129     (int)odata);
130     }
131     break;
132     case 0x08: /* addr_clr */
133     if (writeflag == MEM_WRITE) {
134     debug("[ bt455: write to addr_clr, value 0x%02x ]\n",
135     (int)idata);
136     d->addr_clr = idata;
137     } else {
138     odata = d->addr_clr;
139     debug("[ bt455: read from addr_clr: value 0x%02x ]\n",
140     (int)odata);
141     }
142     break;
143     case 0x0c: /* addr_ovly */
144     if (writeflag == MEM_WRITE) {
145     debug("[ bt455: write to addr_ovly, value 0x%02x ]\n",
146     (int)idata);
147     d->addr_ovly = idata;
148     } else {
149     odata = d->addr_ovly;
150     debug("[ bt455: read from addr_ovly: value 0x%02x ]\n",
151     (int)odata);
152     }
153     break;
154     default:
155     if (writeflag == MEM_WRITE) {
156     debug("[ bt455: unimplemented write to address 0x%x,"
157     " data=0x%02x ]\n", (int)relative_addr, (int)idata);
158     } else {
159     debug("[ bt455: unimplemented read from address "
160     "0x%x ]\n", (int)relative_addr);
161     }
162     }
163    
164     if (writeflag == MEM_READ)
165     memory_writemax64(cpu, data, len, odata);
166    
167     return 1;
168     }
169    
170    
171     /*
172     * dev_bt455_init():
173     */
174     void dev_bt455_init(struct memory *mem, uint64_t baseaddr,
175     struct vfb_data *vfb_data)
176     {
177     struct bt455_data *d = malloc(sizeof(struct bt455_data));
178     if (d == NULL) {
179     fprintf(stderr, "out of memory\n");
180     exit(1);
181     }
182     memset(d, 0, sizeof(struct bt455_data));
183     d->vfb_data = vfb_data;
184     d->rgb_palette = vfb_data->rgb_palette;
185    
186     memory_device_register(mem, "bt455", baseaddr, DEV_BT455_LENGTH,
187     dev_bt455_access, (void *)d, MEM_DEFAULT, NULL);
188     }
189    
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