Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/legacy.c
Version:
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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/5.3/sys/amd64/amd64/legacy.c 133898 2004-08-16 22:54:50Z peter $"); 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/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/module.h> 44 #include <machine/bus.h> 45 #include <sys/pcpu.h> 46 #include <sys/rman.h> 47 #include <sys/smp.h> 48 49 #include <machine/legacyvar.h> 50 #include <machine/resource.h> 51 52 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device"); 53 struct legacy_device { 54 int lg_pcibus; 55 }; 56 57 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev)) 58 59 static void legacy_identify(driver_t *driver, device_t parent); 60 static int legacy_probe(device_t); 61 static int legacy_attach(device_t); 62 static int legacy_print_child(device_t, device_t); 63 static device_t legacy_add_child(device_t bus, int order, const char *name, 64 int unit); 65 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *); 66 static int legacy_write_ivar(device_t, device_t, int, uintptr_t); 67 68 static device_method_t legacy_methods[] = { 69 /* Device interface */ 70 DEVMETHOD(device_identify, legacy_identify), 71 DEVMETHOD(device_probe, legacy_probe), 72 DEVMETHOD(device_attach, legacy_attach), 73 DEVMETHOD(device_detach, bus_generic_detach), 74 DEVMETHOD(device_shutdown, bus_generic_shutdown), 75 DEVMETHOD(device_suspend, bus_generic_suspend), 76 DEVMETHOD(device_resume, bus_generic_resume), 77 78 /* Bus interface */ 79 DEVMETHOD(bus_print_child, legacy_print_child), 80 DEVMETHOD(bus_add_child, legacy_add_child), 81 DEVMETHOD(bus_read_ivar, legacy_read_ivar), 82 DEVMETHOD(bus_write_ivar, legacy_write_ivar), 83 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 84 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 85 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 86 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 87 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 88 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 89 90 { 0, 0 } 91 }; 92 93 static driver_t legacy_driver = { 94 "legacy", 95 legacy_methods, 96 1, /* no softc */ 97 }; 98 static devclass_t legacy_devclass; 99 100 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0); 101 102 static void 103 legacy_identify(driver_t *driver, device_t parent) 104 { 105 106 /* 107 * Add child device with order of 1 so it gets probed 108 * after ACPI (which is at order 0. 109 */ 110 if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL) 111 panic("legacy: could not attach"); 112 } 113 114 static int 115 legacy_probe(device_t dev) 116 { 117 device_t acpi; 118 119 /* 120 * Fail to probe if ACPI is ok. 121 */ 122 acpi = devclass_get_device(devclass_find("acpi"), 0); 123 if (acpi != NULL && device_is_alive(acpi)) 124 return (ENXIO); 125 device_set_desc(dev, "legacy system"); 126 device_quiet(dev); 127 return (0); 128 } 129 130 static int 131 legacy_attach(device_t dev) 132 { 133 device_t child; 134 int i; 135 struct pcpu *pc; 136 137 /* 138 * First, let our child driver's identify any child devices that 139 * they can find. Once that is done attach any devices that we 140 * found. 141 */ 142 bus_generic_probe(dev); 143 bus_generic_attach(dev); 144 145 /* Attach CPU pseudo-driver. */ 146 if (!devclass_get_device(devclass_find("cpu"), 0)) { 147 for (i = 0; i <= mp_maxid; i++) 148 if (!CPU_ABSENT(i)) { 149 pc = pcpu_find(i); 150 KASSERT(pc != NULL, ("pcpu_find failed")); 151 child = BUS_ADD_CHILD(dev, 0, "cpu", i); 152 if (child == NULL) 153 panic("legacy_attach cpu"); 154 device_probe_and_attach(child); 155 pc->pc_device = child; 156 device_set_ivars(child, pc); 157 } 158 } 159 160 /* 161 * If we didn't see ISA on a pci bridge, create some 162 * connection points now so it shows up "on motherboard". 163 */ 164 if (!devclass_get_device(devclass_find("isa"), 0)) { 165 child = BUS_ADD_CHILD(dev, 0, "isa", 0); 166 if (child == NULL) 167 panic("legacy_attach isa"); 168 device_probe_and_attach(child); 169 } 170 171 return 0; 172 } 173 174 static int 175 legacy_print_child(device_t bus, device_t child) 176 { 177 struct legacy_device *atdev = DEVTOAT(child); 178 int retval = 0; 179 180 retval += bus_print_child_header(bus, child); 181 if (atdev->lg_pcibus != -1) 182 retval += printf(" pcibus %d", atdev->lg_pcibus); 183 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 184 185 return (retval); 186 } 187 188 static device_t 189 legacy_add_child(device_t bus, int order, const char *name, int unit) 190 { 191 device_t child; 192 struct legacy_device *atdev; 193 194 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV, 195 M_NOWAIT | M_ZERO); 196 if (atdev == NULL) 197 return(NULL); 198 atdev->lg_pcibus = -1; 199 200 child = device_add_child_ordered(bus, order, name, unit); 201 if (child == NULL) 202 free(atdev, M_LEGACYDEV); 203 else 204 /* should we free this in legacy_child_detached? */ 205 device_set_ivars(child, atdev); 206 207 return (child); 208 } 209 210 static int 211 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 212 { 213 struct legacy_device *atdev = DEVTOAT(child); 214 215 switch (which) { 216 case LEGACY_IVAR_PCIBUS: 217 *result = atdev->lg_pcibus; 218 break; 219 default: 220 return ENOENT; 221 } 222 return 0; 223 } 224 225 226 static int 227 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 228 { 229 struct legacy_device *atdev = DEVTOAT(child); 230 231 switch (which) { 232 case LEGACY_IVAR_PCIBUS: 233 atdev->lg_pcibus = value; 234 break; 235 default: 236 return ENOENT; 237 } 238 return 0; 239 } 240 241 /* 242 * Legacy CPU attachment when ACPI is not available. Drivers like 243 * cpufreq(4) hang off this. 244 */ 245 static int cpu_read_ivar(device_t dev, device_t child, int index, 246 uintptr_t *result); 247 248 static device_method_t cpu_methods[] = { 249 /* Device interface */ 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_read_ivar, cpu_read_ivar), 259 DEVMETHOD(bus_print_child, bus_generic_print_child), 260 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 261 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 262 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 263 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 264 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 265 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 266 267 { 0, 0 } 268 }; 269 270 static driver_t cpu_driver = { 271 "cpu", 272 cpu_methods, 273 1, /* no softc */ 274 }; 275 static devclass_t cpu_devclass; 276 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0); 277 278 static int 279 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 280 { 281 struct pcpu *pc; 282 283 if (index != 0) 284 return (ENOENT); 285 pc = device_get_ivars(child); 286 if (pc == NULL) 287 return (ENOENT); 288 *result = (uintptr_t)pc; 289 return (0); 290 }
Cache object: c6b28e3d676cf69d27b9f33b5098c917
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