FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/legacy.c
1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/8.3/sys/i386/i386/legacy.c 230714 2012-01-29 01:22:48Z marius $");
32
33 /*
34 * This code implements a system driver for legacy systems that do not
35 * support ACPI or when ACPI support is not present in the kernel.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 #include <sys/cpu.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
45 #include <machine/bus.h>
46 #include <sys/pcpu.h>
47 #include <sys/rman.h>
48 #include <sys/smp.h>
49
50 #include "opt_mca.h"
51 #ifdef DEV_MCA
52 #include <i386/bios/mca_machdep.h>
53 #endif
54
55 #include <machine/legacyvar.h>
56 #include <machine/resource.h>
57
58 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
59 struct legacy_device {
60 int lg_pcibus;
61 };
62
63 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
64
65 static int legacy_probe(device_t);
66 static int legacy_attach(device_t);
67 static int legacy_print_child(device_t, device_t);
68 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
69 int unit);
70 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
71 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
72
73 static device_method_t legacy_methods[] = {
74 /* Device interface */
75 DEVMETHOD(device_probe, legacy_probe),
76 DEVMETHOD(device_attach, legacy_attach),
77 DEVMETHOD(device_detach, bus_generic_detach),
78 DEVMETHOD(device_shutdown, bus_generic_shutdown),
79 DEVMETHOD(device_suspend, bus_generic_suspend),
80 DEVMETHOD(device_resume, bus_generic_resume),
81
82 /* Bus interface */
83 DEVMETHOD(bus_print_child, legacy_print_child),
84 DEVMETHOD(bus_add_child, legacy_add_child),
85 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
86 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
87 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
88 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
89 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
90 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
91 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
92 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
93 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
94
95 { 0, 0 }
96 };
97
98 static driver_t legacy_driver = {
99 "legacy",
100 legacy_methods,
101 1, /* no softc */
102 };
103 static devclass_t legacy_devclass;
104
105 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
106
107 static int
108 legacy_probe(device_t dev)
109 {
110
111 device_set_desc(dev, "legacy system");
112 device_quiet(dev);
113 return (0);
114 }
115
116 static int
117 legacy_attach(device_t dev)
118 {
119 device_t child;
120
121 /*
122 * Let our child drivers identify any child devices that they
123 * can find. Once that is done attach any devices that we
124 * found.
125 */
126 bus_generic_probe(dev);
127 bus_generic_attach(dev);
128
129 #ifndef PC98
130 /*
131 * If we didn't see EISA or ISA on a pci bridge, create some
132 * connection points now so they show up "on motherboard".
133 */
134 if (!devclass_get_device(devclass_find("eisa"), 0)) {
135 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
136 if (child == NULL)
137 panic("legacy_attach eisa");
138 device_probe_and_attach(child);
139 }
140 #endif
141 #ifdef DEV_MCA
142 if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
143 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
144 if (child == 0)
145 panic("legacy_probe mca");
146 device_probe_and_attach(child);
147 }
148 #endif
149 if (!devclass_get_device(devclass_find("isa"), 0)) {
150 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
151 if (child == NULL)
152 panic("legacy_attach isa");
153 device_probe_and_attach(child);
154 }
155
156 return 0;
157 }
158
159 static int
160 legacy_print_child(device_t bus, device_t child)
161 {
162 struct legacy_device *atdev = DEVTOAT(child);
163 int retval = 0;
164
165 retval += bus_print_child_header(bus, child);
166 if (atdev->lg_pcibus != -1)
167 retval += printf(" pcibus %d", atdev->lg_pcibus);
168 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
169
170 return (retval);
171 }
172
173 static device_t
174 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
175 {
176 device_t child;
177 struct legacy_device *atdev;
178
179 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
180 M_NOWAIT | M_ZERO);
181 if (atdev == NULL)
182 return(NULL);
183 atdev->lg_pcibus = -1;
184
185 child = device_add_child_ordered(bus, order, name, unit);
186 if (child == NULL)
187 free(atdev, M_LEGACYDEV);
188 else
189 /* should we free this in legacy_child_detached? */
190 device_set_ivars(child, atdev);
191
192 return (child);
193 }
194
195 static int
196 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
197 {
198 struct legacy_device *atdev = DEVTOAT(child);
199
200 switch (which) {
201 case LEGACY_IVAR_PCIDOMAIN:
202 *result = 0;
203 break;
204 case LEGACY_IVAR_PCIBUS:
205 *result = atdev->lg_pcibus;
206 break;
207 default:
208 return ENOENT;
209 }
210 return 0;
211 }
212
213
214 static int
215 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
216 {
217 struct legacy_device *atdev = DEVTOAT(child);
218
219 switch (which) {
220 case LEGACY_IVAR_PCIDOMAIN:
221 return EINVAL;
222 case LEGACY_IVAR_PCIBUS:
223 atdev->lg_pcibus = value;
224 break;
225 default:
226 return ENOENT;
227 }
228 return 0;
229 }
230
231 /*
232 * Legacy CPU attachment when ACPI is not available. Drivers like
233 * cpufreq(4) hang off this.
234 */
235 static void cpu_identify(driver_t *driver, device_t parent);
236 static int cpu_read_ivar(device_t dev, device_t child, int index,
237 uintptr_t *result);
238 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
239 int unit);
240 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
241
242 struct cpu_device {
243 struct resource_list cd_rl;
244 struct pcpu *cd_pcpu;
245 };
246
247 static device_method_t cpu_methods[] = {
248 /* Device interface */
249 DEVMETHOD(device_identify, cpu_identify),
250 DEVMETHOD(device_probe, bus_generic_probe),
251 DEVMETHOD(device_attach, bus_generic_attach),
252 DEVMETHOD(device_detach, bus_generic_detach),
253 DEVMETHOD(device_shutdown, bus_generic_shutdown),
254 DEVMETHOD(device_suspend, bus_generic_suspend),
255 DEVMETHOD(device_resume, bus_generic_resume),
256
257 /* Bus interface */
258 DEVMETHOD(bus_add_child, cpu_add_child),
259 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
260 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
261 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
262 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
263 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
264 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
265 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
266 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
267 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
268 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
269
270 DEVMETHOD_END
271 };
272
273 static driver_t cpu_driver = {
274 "cpu",
275 cpu_methods,
276 1, /* no softc */
277 };
278 static devclass_t cpu_devclass;
279 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
280
281 static void
282 cpu_identify(driver_t *driver, device_t parent)
283 {
284 device_t child;
285 int i;
286
287 /*
288 * Attach a cpuX device for each CPU. We use an order of 150
289 * so that these devices are attached after the Host-PCI
290 * bridges (which are added at order 100).
291 */
292 CPU_FOREACH(i) {
293 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
294 if (child == NULL)
295 panic("legacy_attach cpu");
296 }
297 }
298
299 static device_t
300 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
301 {
302 struct cpu_device *cd;
303 device_t child;
304 struct pcpu *pc;
305
306 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
307 return (NULL);
308
309 resource_list_init(&cd->cd_rl);
310 pc = pcpu_find(device_get_unit(bus));
311 cd->cd_pcpu = pc;
312
313 child = device_add_child_ordered(bus, order, name, unit);
314 if (child != NULL) {
315 pc->pc_device = child;
316 device_set_ivars(child, cd);
317 } else
318 free(cd, M_DEVBUF);
319 return (child);
320 }
321
322 static struct resource_list *
323 cpu_get_rlist(device_t dev, device_t child)
324 {
325 struct cpu_device *cpdev;
326
327 cpdev = device_get_ivars(child);
328 return (&cpdev->cd_rl);
329 }
330
331 static int
332 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
333 {
334 struct cpu_device *cpdev;
335
336 if (index != CPU_IVAR_PCPU)
337 return (ENOENT);
338 cpdev = device_get_ivars(child);
339 *result = (uintptr_t)cpdev->cd_pcpu;
340 return (0);
341 }
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