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/9.0/sys/i386/i386/legacy.c 222929 2011-06-10 12:30:16Z jhb $");
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/clock.h>
56 #include <machine/legacyvar.h>
57 #include <machine/resource.h>
58
59 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
60 struct legacy_device {
61 int lg_pcibus;
62 };
63
64 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
65
66 static int legacy_probe(device_t);
67 static int legacy_attach(device_t);
68 static int legacy_print_child(device_t, device_t);
69 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
70 int unit);
71 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
72 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
73
74 static device_method_t legacy_methods[] = {
75 /* Device interface */
76 DEVMETHOD(device_probe, legacy_probe),
77 DEVMETHOD(device_attach, legacy_attach),
78 DEVMETHOD(device_detach, bus_generic_detach),
79 DEVMETHOD(device_shutdown, bus_generic_shutdown),
80 DEVMETHOD(device_suspend, bus_generic_suspend),
81 DEVMETHOD(device_resume, bus_generic_resume),
82
83 /* Bus interface */
84 DEVMETHOD(bus_print_child, legacy_print_child),
85 DEVMETHOD(bus_add_child, legacy_add_child),
86 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
87 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
88 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
89 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
90 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
91 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
92 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
93 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
94 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
95
96 { 0, 0 }
97 };
98
99 static driver_t legacy_driver = {
100 "legacy",
101 legacy_methods,
102 1, /* no softc */
103 };
104 static devclass_t legacy_devclass;
105
106 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
107
108 static int
109 legacy_probe(device_t dev)
110 {
111
112 device_set_desc(dev, "legacy system");
113 device_quiet(dev);
114 return (0);
115 }
116
117 static int
118 legacy_attach(device_t dev)
119 {
120 device_t child;
121
122 /*
123 * Let our child drivers identify any child devices that they
124 * can find. Once that is done attach any devices that we
125 * found.
126 */
127 bus_generic_probe(dev);
128 bus_generic_attach(dev);
129
130 #ifndef PC98
131 /*
132 * If we didn't see EISA or ISA on a pci bridge, create some
133 * connection points now so they show up "on motherboard".
134 */
135 if (!devclass_get_device(devclass_find("eisa"), 0)) {
136 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
137 if (child == NULL)
138 panic("legacy_attach eisa");
139 device_probe_and_attach(child);
140 }
141 #endif
142 #ifdef DEV_MCA
143 if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
144 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
145 if (child == 0)
146 panic("legacy_probe mca");
147 device_probe_and_attach(child);
148 }
149 #endif
150 if (!devclass_get_device(devclass_find("isa"), 0)) {
151 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
152 if (child == NULL)
153 panic("legacy_attach isa");
154 device_probe_and_attach(child);
155 }
156
157 return 0;
158 }
159
160 static int
161 legacy_print_child(device_t bus, device_t child)
162 {
163 struct legacy_device *atdev = DEVTOAT(child);
164 int retval = 0;
165
166 retval += bus_print_child_header(bus, child);
167 if (atdev->lg_pcibus != -1)
168 retval += printf(" pcibus %d", atdev->lg_pcibus);
169 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
170
171 return (retval);
172 }
173
174 static device_t
175 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
176 {
177 device_t child;
178 struct legacy_device *atdev;
179
180 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
181 M_NOWAIT | M_ZERO);
182 if (atdev == NULL)
183 return(NULL);
184 atdev->lg_pcibus = -1;
185
186 child = device_add_child_ordered(bus, order, name, unit);
187 if (child == NULL)
188 free(atdev, M_LEGACYDEV);
189 else
190 /* should we free this in legacy_child_detached? */
191 device_set_ivars(child, atdev);
192
193 return (child);
194 }
195
196 static int
197 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
198 {
199 struct legacy_device *atdev = DEVTOAT(child);
200
201 switch (which) {
202 case LEGACY_IVAR_PCIDOMAIN:
203 *result = 0;
204 break;
205 case LEGACY_IVAR_PCIBUS:
206 *result = atdev->lg_pcibus;
207 break;
208 default:
209 return ENOENT;
210 }
211 return 0;
212 }
213
214
215 static int
216 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
217 {
218 struct legacy_device *atdev = DEVTOAT(child);
219
220 switch (which) {
221 case LEGACY_IVAR_PCIDOMAIN:
222 return EINVAL;
223 case LEGACY_IVAR_PCIBUS:
224 atdev->lg_pcibus = value;
225 break;
226 default:
227 return ENOENT;
228 }
229 return 0;
230 }
231
232 /*
233 * Legacy CPU attachment when ACPI is not available. Drivers like
234 * cpufreq(4) hang off this.
235 */
236 static void cpu_identify(driver_t *driver, device_t parent);
237 static int cpu_read_ivar(device_t dev, device_t child, int index,
238 uintptr_t *result);
239 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
240 int unit);
241 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
242
243 struct cpu_device {
244 struct resource_list cd_rl;
245 struct pcpu *cd_pcpu;
246 };
247
248 static device_method_t cpu_methods[] = {
249 /* Device interface */
250 DEVMETHOD(device_identify, cpu_identify),
251 DEVMETHOD(device_probe, bus_generic_probe),
252 DEVMETHOD(device_attach, bus_generic_attach),
253 DEVMETHOD(device_detach, bus_generic_detach),
254 DEVMETHOD(device_shutdown, bus_generic_shutdown),
255 DEVMETHOD(device_suspend, bus_generic_suspend),
256 DEVMETHOD(device_resume, bus_generic_resume),
257
258 /* Bus interface */
259 DEVMETHOD(bus_add_child, cpu_add_child),
260 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
261 DEVMETHOD(bus_print_child, bus_generic_print_child),
262 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
263 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
264 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
265 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
266 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
267 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
268 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
269 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
270 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
271 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
272
273 { 0, 0 }
274 };
275
276 static driver_t cpu_driver = {
277 "cpu",
278 cpu_methods,
279 1, /* no softc */
280 };
281 static devclass_t cpu_devclass;
282 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
283
284 static void
285 cpu_identify(driver_t *driver, device_t parent)
286 {
287 device_t child;
288 int i;
289
290 /*
291 * Attach a cpuX device for each CPU. We use an order of 150
292 * so that these devices are attached after the Host-PCI
293 * bridges (which are added at order 100).
294 */
295 CPU_FOREACH(i) {
296 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
297 if (child == NULL)
298 panic("legacy_attach cpu");
299 }
300 }
301
302 static device_t
303 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
304 {
305 struct cpu_device *cd;
306 device_t child;
307 struct pcpu *pc;
308
309 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
310 return (NULL);
311
312 resource_list_init(&cd->cd_rl);
313 pc = pcpu_find(device_get_unit(bus));
314 cd->cd_pcpu = pc;
315
316 child = device_add_child_ordered(bus, order, name, unit);
317 if (child != NULL) {
318 pc->pc_device = child;
319 device_set_ivars(child, cd);
320 } else
321 free(cd, M_DEVBUF);
322 return (child);
323 }
324
325 static struct resource_list *
326 cpu_get_rlist(device_t dev, device_t child)
327 {
328 struct cpu_device *cpdev;
329
330 cpdev = device_get_ivars(child);
331 return (&cpdev->cd_rl);
332 }
333
334 static int
335 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
336 {
337 struct cpu_device *cpdev;
338
339 switch (index) {
340 case CPU_IVAR_PCPU:
341 cpdev = device_get_ivars(child);
342 *result = (uintptr_t)cpdev->cd_pcpu;
343 break;
344 case CPU_IVAR_NOMINAL_MHZ:
345 if (tsc_is_invariant) {
346 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
347 1000000);
348 break;
349 }
350 /* FALLTHROUGH */
351 default:
352 return (ENOENT);
353 }
354 return (0);
355 }
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