2 * Copyright 1998 Massachusetts Institute of Technology
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
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13 * purpose. It is provided "as is" without express or implied
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
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30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
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.
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
45 #include <machine/bus.h>
50 #include <machine/clock.h>
51 #include <machine/resource.h>
52 #include <x86/legacyvar.h>
54 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
55 struct legacy_device {
61 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
63 static int legacy_probe(device_t);
64 static int legacy_attach(device_t);
65 static int legacy_print_child(device_t, device_t);
66 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
68 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
69 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
71 static device_method_t legacy_methods[] = {
72 /* Device interface */
73 DEVMETHOD(device_probe, legacy_probe),
74 DEVMETHOD(device_attach, legacy_attach),
75 DEVMETHOD(device_detach, bus_generic_detach),
76 DEVMETHOD(device_shutdown, bus_generic_shutdown),
77 DEVMETHOD(device_suspend, bus_generic_suspend),
78 DEVMETHOD(device_resume, bus_generic_resume),
81 DEVMETHOD(bus_print_child, legacy_print_child),
82 DEVMETHOD(bus_add_child, legacy_add_child),
83 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
84 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
85 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
86 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
87 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
88 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
89 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
90 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
91 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
96 static driver_t legacy_driver = {
101 static devclass_t legacy_devclass;
103 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
106 legacy_probe(device_t dev)
109 device_set_desc(dev, "legacy system");
115 legacy_attach(device_t dev)
120 * Let our child drivers identify any child devices that they
121 * can find. Once that is done attach any devices that we
124 bus_generic_probe(dev);
125 bus_generic_attach(dev);
128 * If we didn't see ISA on a pci bridge, create some
129 * connection points now so they show up "on motherboard".
131 if (!devclass_get_device(devclass_find("isa"), 0)) {
132 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
134 panic("legacy_attach isa");
135 device_probe_and_attach(child);
142 legacy_print_child(device_t bus, device_t child)
144 struct legacy_device *atdev = DEVTOAT(child);
147 retval += bus_print_child_header(bus, child);
148 if (atdev->lg_pcibus != -1)
149 retval += printf(" pcibus %d", atdev->lg_pcibus);
150 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
156 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
159 struct legacy_device *atdev;
161 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
165 atdev->lg_pcibus = -1;
166 atdev->lg_pcislot = -1;
167 atdev->lg_pcifunc = -1;
169 child = device_add_child_ordered(bus, order, name, unit);
171 free(atdev, M_LEGACYDEV);
173 /* should we free this in legacy_child_detached? */
174 device_set_ivars(child, atdev);
180 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
182 struct legacy_device *atdev = DEVTOAT(child);
185 case LEGACY_IVAR_PCIDOMAIN:
188 case LEGACY_IVAR_PCIBUS:
189 *result = atdev->lg_pcibus;
191 case LEGACY_IVAR_PCISLOT:
192 *result = atdev->lg_pcislot;
194 case LEGACY_IVAR_PCIFUNC:
195 *result = atdev->lg_pcifunc;
205 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
207 struct legacy_device *atdev = DEVTOAT(child);
210 case LEGACY_IVAR_PCIDOMAIN:
212 case LEGACY_IVAR_PCIBUS:
213 atdev->lg_pcibus = value;
215 case LEGACY_IVAR_PCISLOT:
216 atdev->lg_pcislot = value;
218 case LEGACY_IVAR_PCIFUNC:
219 atdev->lg_pcifunc = value;
228 * Legacy CPU attachment when ACPI is not available. Drivers like
229 * cpufreq(4) hang off this.
231 static void cpu_identify(driver_t *driver, device_t parent);
232 static int cpu_read_ivar(device_t dev, device_t child, int index,
234 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
236 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
239 struct resource_list cd_rl;
240 struct pcpu *cd_pcpu;
243 static device_method_t cpu_methods[] = {
244 /* Device interface */
245 DEVMETHOD(device_identify, cpu_identify),
246 DEVMETHOD(device_probe, bus_generic_probe),
247 DEVMETHOD(device_attach, bus_generic_attach),
248 DEVMETHOD(device_detach, bus_generic_detach),
249 DEVMETHOD(device_shutdown, bus_generic_shutdown),
250 DEVMETHOD(device_suspend, bus_generic_suspend),
251 DEVMETHOD(device_resume, bus_generic_resume),
254 DEVMETHOD(bus_add_child, cpu_add_child),
255 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
256 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
257 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
258 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
259 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
260 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
261 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
262 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
263 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
264 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
269 static driver_t cpu_driver = {
274 static devclass_t cpu_devclass;
275 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
278 cpu_identify(driver_t *driver, device_t parent)
284 * Attach a cpuX device for each CPU. We use an order of 150
285 * so that these devices are attached after the Host-PCI
286 * bridges (which are added at order 100).
289 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
291 panic("legacy_attach cpu");
296 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
298 struct cpu_device *cd;
302 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
305 resource_list_init(&cd->cd_rl);
306 pc = pcpu_find(device_get_unit(bus));
309 child = device_add_child_ordered(bus, order, name, unit);
311 pc->pc_device = child;
312 device_set_ivars(child, cd);
318 static struct resource_list *
319 cpu_get_rlist(device_t dev, device_t child)
321 struct cpu_device *cpdev;
323 cpdev = device_get_ivars(child);
324 return (&cpdev->cd_rl);
328 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
330 struct cpu_device *cpdev;
334 cpdev = device_get_ivars(child);
335 *result = (uintptr_t)cpdev->cd_pcpu;
337 case CPU_IVAR_NOMINAL_MHZ:
338 if (tsc_is_invariant) {
339 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /