/[gxemul]/trunk/src/devices/bus_pci.c
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Contents of /trunk/src/devices/bus_pci.c

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Revision 4 - (show annotations)
Mon Oct 8 16:18:00 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 6367 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.707 2005/04/27 16:37:33 debug Exp $
20050408	Some minor updates to the wdc. Linux now doesn't complain
		anymore if a disk is non-present.
20050409	Various minor fixes (a bintrans bug, and some other things).
		The wdc seems to work with Playstation2 emulation, but there
		is a _long_ annoying delay when disks are detected.
		Fixing a really important bintrans bug (when devices and RAM
		are mixed within 4KB pages), which was triggered with
		NetBSD/playstation2 kernels.
20050410	Adding a dummy dev_ps2_ether (just so that NetBSD doesn't
		complain as much during bootup).
		Symbols starting with '$' are now ignored.
		Renaming dev_ps2_ohci.c to dev_ohci.c, etc.
20050411	Moving the bintrans-cache-isolation check from cpu_mips.c to
		cpu_mips_coproc.c. (I thought this would give a speedup, but
		it's not noticable.)
		Better playstation2 sbus interrupt code.
		Skip ahead many ticks if the count register is read manually.
		(This increases the speed of delay-loops that simply read
		the count register.)
20050412	Updates to the playstation2 timer/interrupt code.
		Some other minor updates.
20050413	NetBSD/cobalt runs from a disk image :-) including userland;
		updating the documentation on how to install NetBSD/cobalt
		using NetBSD/pmax (!).
		Some minor bintrans updates (no real speed improvement) and
		other minor updates (playstation2 now uses the -o options).
20050414	Adding a dummy x86 (and AMD64) mode.
20050415	Adding some (32-bit and 16-bit) x86 instructions.
		Adding some initial support for non-SCSI, non-IDE floppy
		images. (The x86 mode can boot from these, more or less.)
		Moving the devices/ and include/ directories to src/devices/
		and src/include/, respectively.
20050416	Continuing on the x86 stuff. (Adding pc_bios.c and some simple
		support for software interrupts in 16-bit mode.)
20050417	Ripping out most of the x86 instruction decoding stuff, trying
		to rewrite it in a cleaner way.
		Disabling some of the least working CPU families in the
		configure script (sparc, x86, alpha, hppa), so that they are
		not enabled by default.
20050418	Trying to fix the bug which caused problems when turning on
		and off bintrans interactively, by flushing the bintrans cache
		whenever bintrans is manually (re)enabled.
20050419	Adding the 'lswi' ppc instruction.
		Minor updates to the x86 instruction decoding.
20050420	Renaming x86 register name indices from R_xx to X86_R_xx (this
		makes building on Tru64 nicer).
20050422	Adding a check for duplicate MIPS TLB entries on tlbwr/tlbwi.
20050427	Adding screenshots to guestoses.html.
		Some minor fixes and testing for the next release.

==============  RELEASE 0.3.2  ==============


1 /*
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 * $Id: bus_pci.c,v 1.10 2005/03/18 23:20:52 debug Exp $
29 *
30 * This is a generic PCI bus device, used by even lower level devices.
31 * For example, the "gt" device used in Cobalt machines contains a PCI
32 * device.
33 *
34 * TODO: This more or less just a dummy bus device, so far.
35 */
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include "memory.h"
42 #include "misc.h"
43
44 #include "bus_pci.h"
45
46
47 /*
48 * bus_pci_access():
49 *
50 * relative_addr should be either BUS_PCI_ADDR or BUS_PCI_DATA. The uint64_t
51 * pointed to by data should contain the word to be written to the pci bus,
52 * or a placeholder for information read from the bus.
53 *
54 * Returns 1 if ok, 0 on error.
55 */
56 int bus_pci_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr,
57 uint64_t *data, int writeflag, struct pci_data *pci_data)
58 {
59 struct pci_device *dev, *found;
60 int bus, device, function, registernr;
61
62 if (writeflag == MEM_READ)
63 *data = 0;
64
65 switch (relative_addr) {
66 case BUS_PCI_ADDR:
67 if (writeflag == MEM_WRITE) {
68 debug("[ bus_pci: write to PCI ADDR: data = 0x%016llx"
69 " ]\n", (long long)*data);
70 pci_data->pci_addr = *data;
71 } else {
72 debug("[ bus_pci: read from PCI ADDR (data = "
73 "0x%016llx) ]\n", (long long)pci_data->pci_addr);
74 *data = pci_data->pci_addr;
75 }
76 break;
77 case BUS_PCI_DATA:
78 if (writeflag == MEM_WRITE) {
79 debug("[ bus_pci: write to PCI DATA: data = "
80 "0x%016llx ]\n", (long long)*data);
81 if (*data == 0xffffffffULL)
82 pci_data->last_was_write_ffffffff = 1;
83 } else {
84 /* Get the bus, device, and function numbers from
85 the address: */
86 bus = (pci_data->pci_addr >> 16) & 0xff;
87 device = (pci_data->pci_addr >> 11) & 0x1f;
88 function = (pci_data->pci_addr >> 8) & 0x7;
89 registernr = (pci_data->pci_addr) & 0xff;
90
91 /* Scan through the list of pci_device entries. */
92 dev = pci_data->first_device;
93 found = NULL;
94
95 while (dev != NULL && found == NULL) {
96 if (dev->bus == bus &&
97 dev->function == function &&
98 dev->device == device)
99 found = dev;
100 dev = dev->next;
101 }
102
103 if (found == NULL) {
104 if ((pci_data->pci_addr & 0xff) == 0)
105 *data = 0xffffffff;
106 else
107 *data = 0;
108 return 1;
109 }
110
111 *data = 0;
112
113 if (pci_data->last_was_write_ffffffff &&
114 registernr >= 0x10 && registernr <= 0x24) {
115 /* TODO: real length!!! */
116 *data = 0x00400000 - 1;
117 } else if (found->read_register != NULL)
118 *data = found->read_register(registernr);
119
120 pci_data->last_was_write_ffffffff = 0;
121
122 debug("[ bus_pci: read from PCI DATA, addr = 0x%08lx "
123 "(bus %i, device %i, function %i, register "
124 "0x%02x): 0x%08lx ]\n", (long)pci_data->pci_addr,
125 bus, device, function, registernr, (long)*data);
126 }
127
128 break;
129 default:
130 if (writeflag==MEM_READ) {
131 debug("[ bus_pci: read from unimplemented addr "
132 "0x%x ]\n", (int)relative_addr);
133 *data = 0;
134 } else {
135 debug("[ bus_pci: write to unimplemented addr "
136 "0x%x:", (int)relative_addr);
137 }
138 }
139
140 return 1;
141 }
142
143
144 /*
145 * bus_pci_add():
146 *
147 * Add a PCI device to a bus_pci device.
148 */
149 void bus_pci_add(struct machine *machine, struct pci_data *pci_data,
150 struct memory *mem, int bus, int device, int function,
151 void (*init)(struct machine *, struct memory *),
152 uint32_t (*read_register)(int reg))
153 {
154 struct pci_device *new_device;
155
156 /* Make sure this bus/device/function number isn't already in use: */
157 new_device = pci_data->first_device;
158 while (new_device != NULL) {
159 if (new_device->bus == bus &&
160 new_device->device == device &&
161 new_device->function == function) {
162 fatal("bus_pci_add(): (bus %i, device %i, function"
163 " %i) already in use\n", bus, device, function);
164 return;
165 }
166 new_device = new_device->next;
167 }
168
169 new_device = malloc(sizeof(struct pci_device));
170 if (new_device == NULL) {
171 fprintf(stderr, "out of memory\n");
172 exit(1);
173 }
174
175 memset(new_device, 0, sizeof(struct pci_device));
176 new_device->bus = bus;
177 new_device->device = device;
178 new_device->function = function;
179 new_device->init = init;
180 new_device->read_register = read_register;
181
182 /* Add the new device first in the PCI bus' chain: */
183 new_device->next = pci_data->first_device;
184 pci_data->first_device = new_device;
185
186 /* Call the PCI device' init function: */
187 if (init != NULL)
188 init(machine, mem);
189 }
190
191
192 /*
193 * bus_pci_init():
194 *
195 * This doesn't register a device, but instead returns a pointer to a struct
196 * which should be passed to bus_pci_access() when accessing the PCI bus.
197 */
198 struct pci_data *bus_pci_init(int irq_nr)
199 {
200 struct pci_data *d;
201
202 d = malloc(sizeof(struct pci_data));
203 if (d == NULL) {
204 fprintf(stderr, "out of memory\n");
205 exit(1);
206 }
207 memset(d, 0, sizeof(struct pci_data));
208 d->irq_nr = irq_nr;
209
210 return d;
211 }
212

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