/[gxemul]/trunk/src/devices/dev_disk.c
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Annotation of /trunk/src/devices/dev_disk.c

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Revision 18 - (hide annotations)
Mon Oct 8 16:19:11 2007 UTC (16 years, 5 months ago) by dpavlin
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File size: 4997 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 12 /*
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_disk.c,v 1.8 2005/10/26 14:37:03 debug Exp $
29 dpavlin 12 *
30     * Basic "Disk" device. This is a simple test device which can be used to
31     * read and write data from disk devices.
32     */
33    
34     #include <stdio.h>
35     #include <stdlib.h>
36     #include <string.h>
37    
38     #include "cpu.h"
39     #include "device.h"
40     #include "devices.h"
41     #include "diskimage.h"
42     #include "emul.h"
43     #include "machine.h"
44     #include "memory.h"
45     #include "misc.h"
46    
47    
48     #define BUF_SIZE 8192
49    
50     struct disk_data {
51     int64_t offset;
52     int disk_id;
53     int command;
54     int status;
55     unsigned char *buf;
56     };
57    
58    
59     /*
60     * dev_disk_buf_access():
61     */
62     int dev_disk_buf_access(struct cpu *cpu, struct memory *mem,
63     uint64_t relative_addr, unsigned char *data, size_t len,
64     int writeflag, void *extra)
65     {
66     struct disk_data *d = (struct disk_data *) extra;
67    
68     if (writeflag == MEM_WRITE)
69     memcpy(d->buf + relative_addr, data, len);
70     else
71     memcpy(data, d->buf + relative_addr, len);
72     return 1;
73     }
74    
75    
76     /*
77     * dev_disk_access():
78     */
79     int dev_disk_access(struct cpu *cpu, struct memory *mem,
80     uint64_t relative_addr, unsigned char *data, size_t len,
81     int writeflag, void *extra)
82     {
83     struct disk_data *d = (struct disk_data *) extra;
84     uint64_t idata = 0, odata = 0;
85    
86 dpavlin 18 if (writeflag == MEM_WRITE)
87     idata = memory_readmax64(cpu, data, len);
88 dpavlin 12
89     switch (relative_addr) {
90     case 0x00:
91     if (writeflag == MEM_READ) {
92     odata = d->offset;
93     } else {
94     d->offset = idata;
95     }
96     break;
97     case 0x10:
98     if (writeflag == MEM_READ) {
99     odata = d->disk_id;
100     } else {
101     d->disk_id = idata;
102     }
103     break;
104     case 0x20:
105     if (writeflag == MEM_READ) {
106     odata = d->command;
107     } else {
108     d->command = idata;
109     switch (d->command) {
110     case 0: d->status = diskimage_access(cpu->machine,
111     d->disk_id, DISKIMAGE_SCSI, 0,
112     d->offset, d->buf, 512);
113     break;
114     case 1: d->status = diskimage_access(cpu->machine,
115     d->disk_id, DISKIMAGE_SCSI, 1,
116     d->offset, d->buf, 512);
117     break;
118     }
119     }
120     break;
121     case 0x30:
122     if (writeflag == MEM_READ) {
123     odata = d->status;
124     } else {
125     d->status = idata;
126     }
127     break;
128     default:if (writeflag == MEM_WRITE) {
129     fatal("[ disk: unimplemented write to "
130     "offset 0x%x: data=0x%x ]\n", (int)
131     relative_addr, (int)idata);
132     } else {
133     fatal("[ disk: unimplemented read from "
134     "offset 0x%x ]\n", (int)relative_addr);
135     }
136     }
137    
138     if (writeflag == MEM_READ)
139     memory_writemax64(cpu, data, len, odata);
140    
141     return 1;
142     }
143    
144    
145     /*
146     * devinit_disk():
147     */
148     int devinit_disk(struct devinit *devinit)
149     {
150     struct disk_data *d = malloc(sizeof(struct disk_data));
151     size_t nlen;
152     char *n1, *n2;
153    
154     nlen = strlen(devinit->name) + 30;
155     n1 = malloc(nlen);
156     n2 = malloc(nlen);
157    
158     if (d == NULL || n1 == NULL || n2 == NULL) {
159     fprintf(stderr, "out of memory\n");
160     exit(1);
161     }
162     memset(d, 0, sizeof(struct disk_data));
163    
164     d->buf = malloc(devinit->machine->arch_pagesize);
165     if (d->buf == NULL) {
166     fprintf(stderr, "out of memory\n");
167     exit(1);
168     }
169     memset(d->buf, 0, devinit->machine->arch_pagesize);
170    
171     snprintf(n1, nlen, "%s [control]", devinit->name);
172     snprintf(n2, nlen, "%s [data buffer]", devinit->name);
173    
174     memory_device_register(devinit->machine->memory, n1,
175     devinit->addr, 0x4000, dev_disk_access, (void *)d,
176     MEM_DEFAULT, NULL);
177    
178     memory_device_register(devinit->machine->memory, n2,
179     devinit->addr + 0x4000, devinit->machine->arch_pagesize,
180     dev_disk_buf_access, (void *)d, MEM_DYNTRANS_OK |
181     MEM_DYNTRANS_WRITE_OK | MEM_READING_HAS_NO_SIDE_EFFECTS, d->buf);
182    
183     return 1;
184     }
185    

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