/[gxemul]/trunk/src/devices/dev_8253.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_8253.c

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Revision 18 - (hide annotations)
Mon Oct 8 16:19:11 2007 UTC (16 years, 6 months ago) by dpavlin
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File size: 3789 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 6 /*
2     * Copyright (C) 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_8253.c,v 1.5 2005/10/26 14:37:03 debug Exp $
29 dpavlin 6 *
30     * 8253/8254 Programmable Interval Timer.
31     *
32     * This is mostly bogus.
33     */
34    
35     #include <stdio.h>
36     #include <stdlib.h>
37     #include <string.h>
38    
39     #include "cpu.h"
40     #include "device.h"
41     #include "devices.h"
42     #include "emul.h"
43     #include "machine.h"
44     #include "memory.h"
45     #include "misc.h"
46    
47    
48     #define DEV_8253_LENGTH 4
49     #define TICK_SHIFT 14
50    
51    
52     struct pit8253_data {
53     int irq_nr;
54     int counter_select;
55     };
56    
57    
58     /*
59     * dev_8253_tick():
60     */
61     void dev_8253_tick(struct cpu *cpu, void *extra)
62     {
63     struct pit8253_data *d = (struct pit8253_data *) extra;
64     cpu_interrupt(cpu, d->irq_nr);
65     }
66    
67    
68     /*
69     * dev_8253_access():
70     */
71     int dev_8253_access(struct cpu *cpu, struct memory *mem,
72     uint64_t relative_addr, unsigned char *data, size_t len,
73     int writeflag, void *extra)
74     {
75     struct pit8253_data *d = (struct pit8253_data *) extra;
76     uint64_t idata = 0, odata = 0;
77    
78 dpavlin 18 if (writeflag == MEM_WRITE)
79     idata = memory_readmax64(cpu, data, len);
80 dpavlin 6
81     /* TODO: ack somewhere else */
82     cpu_interrupt_ack(cpu, d->irq_nr);
83    
84     switch (relative_addr) {
85     case 0x00:
86     if (writeflag == MEM_WRITE) {
87     /* TODO */
88     } else {
89     /* TODO */
90     odata = 1;
91     odata = random();
92     }
93     break;
94     case 0x03:
95     if (writeflag == MEM_WRITE) {
96     d->counter_select = idata >> 6;
97     /* TODO: other bits */
98     } else {
99     odata = d->counter_select << 6;
100     }
101     break;
102     default:
103     if (writeflag == MEM_WRITE) {
104     fatal("[ 8253: unimplemented write to address 0x%x"
105     " data=0x%02x ]\n", (int)relative_addr, (int)idata);
106     } else {
107     fatal("[ 8253: unimplemented read from address 0x%x "
108     "]\n", (int)relative_addr);
109     }
110     }
111    
112     if (writeflag == MEM_READ)
113     memory_writemax64(cpu, data, len, odata);
114    
115     return 1;
116     }
117    
118    
119     /*
120     * devinit_8253():
121     */
122     int devinit_8253(struct devinit *devinit)
123     {
124     struct pit8253_data *d = malloc(sizeof(struct pit8253_data));
125    
126     if (d == NULL) {
127     fprintf(stderr, "out of memory\n");
128     exit(1);
129     }
130     memset(d, 0, sizeof(struct pit8253_data));
131     d->irq_nr = devinit->irq_nr;
132    
133     memory_device_register(devinit->machine->memory, devinit->name,
134     devinit->addr, DEV_8253_LENGTH, dev_8253_access, (void *)d,
135     MEM_DEFAULT, NULL);
136    
137     machine_add_tickfunction(devinit->machine, dev_8253_tick,
138     d, TICK_SHIFT);
139    
140     return 1;
141     }
142    
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