Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/legacy.c
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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/i386/i386/legacy.c 133886 2004-08-16 21:55:29Z gibbs $"); 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 "opt_mca.h" 50 #ifdef DEV_MCA 51 #include <i386/bios/mca_machdep.h> 52 #endif 53 54 #include <machine/legacyvar.h> 55 #include <machine/resource.h> 56 57 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device"); 58 struct legacy_device { 59 int lg_pcibus; 60 }; 61 62 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev)) 63 64 static void legacy_identify(driver_t *driver, device_t parent); 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, 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_identify, legacy_identify), 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_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 void 108 legacy_identify(driver_t *driver, device_t parent) 109 { 110 111 /* 112 * Add child device with order of 1 so it gets probed 113 * after ACPI (which is at order 0. 114 */ 115 if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL) 116 panic("legacy: could not attach"); 117 } 118 119 static int 120 legacy_probe(device_t dev) 121 { 122 device_t acpi; 123 124 /* 125 * Fail to probe if ACPI is ok. 126 */ 127 acpi = devclass_get_device(devclass_find("acpi"), 0); 128 if (acpi != NULL && device_is_alive(acpi)) 129 return (ENXIO); 130 device_set_desc(dev, "legacy system"); 131 device_quiet(dev); 132 return (0); 133 } 134 135 static int 136 legacy_attach(device_t dev) 137 { 138 device_t child; 139 int i; 140 struct pcpu *pc; 141 142 /* 143 * First, let our child driver's identify any child devices that 144 * they can find. Once that is done attach any devices that we 145 * found. 146 */ 147 bus_generic_probe(dev); 148 bus_generic_attach(dev); 149 150 /* Attach CPU pseudo-driver. */ 151 if (!devclass_get_device(devclass_find("cpu"), 0)) { 152 for (i = 0; i <= mp_maxid; i++) 153 if (!CPU_ABSENT(i)) { 154 pc = pcpu_find(i); 155 KASSERT(pc != NULL, ("pcpu_find failed")); 156 child = BUS_ADD_CHILD(dev, 0, "cpu", i); 157 if (child == NULL) 158 panic("legacy_attach cpu"); 159 device_probe_and_attach(child); 160 pc->pc_device = child; 161 device_set_ivars(child, pc); 162 } 163 } 164 165 /* 166 * If we didn't see EISA or ISA on a pci bridge, create some 167 * connection points now so they show up "on motherboard". 168 */ 169 if (!devclass_get_device(devclass_find("eisa"), 0)) { 170 child = BUS_ADD_CHILD(dev, 0, "eisa", 0); 171 if (child == NULL) 172 panic("legacy_attach eisa"); 173 device_probe_and_attach(child); 174 } 175 #ifdef DEV_MCA 176 if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) { 177 child = BUS_ADD_CHILD(dev, 0, "mca", 0); 178 if (child == 0) 179 panic("legacy_probe mca"); 180 device_probe_and_attach(child); 181 } 182 #endif 183 if (!devclass_get_device(devclass_find("isa"), 0)) { 184 child = BUS_ADD_CHILD(dev, 0, "isa", 0); 185 if (child == NULL) 186 panic("legacy_attach isa"); 187 device_probe_and_attach(child); 188 } 189 190 return 0; 191 } 192 193 static int 194 legacy_print_child(device_t bus, device_t child) 195 { 196 struct legacy_device *atdev = DEVTOAT(child); 197 int retval = 0; 198 199 retval += bus_print_child_header(bus, child); 200 if (atdev->lg_pcibus != -1) 201 retval += printf(" pcibus %d", atdev->lg_pcibus); 202 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 203 204 return (retval); 205 } 206 207 static device_t 208 legacy_add_child(device_t bus, int order, const char *name, int unit) 209 { 210 device_t child; 211 struct legacy_device *atdev; 212 213 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV, 214 M_NOWAIT | M_ZERO); 215 if (atdev == NULL) 216 return(NULL); 217 atdev->lg_pcibus = -1; 218 219 child = device_add_child_ordered(bus, order, name, unit); 220 if (child == NULL) 221 free(atdev, M_LEGACYDEV); 222 else 223 /* should we free this in legacy_child_detached? */ 224 device_set_ivars(child, atdev); 225 226 return (child); 227 } 228 229 static int 230 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 231 { 232 struct legacy_device *atdev = DEVTOAT(child); 233 234 switch (which) { 235 case LEGACY_IVAR_PCIBUS: 236 *result = atdev->lg_pcibus; 237 break; 238 default: 239 return ENOENT; 240 } 241 return 0; 242 } 243 244 245 static int 246 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 247 { 248 struct legacy_device *atdev = DEVTOAT(child); 249 250 switch (which) { 251 case LEGACY_IVAR_PCIBUS: 252 atdev->lg_pcibus = value; 253 break; 254 default: 255 return ENOENT; 256 } 257 return 0; 258 } 259 260 /* 261 * Legacy CPU attachment when ACPI is not available. Drivers like 262 * cpufreq(4) hang off this. 263 */ 264 static int cpu_read_ivar(device_t dev, device_t child, int index, 265 uintptr_t *result); 266 267 static device_method_t cpu_methods[] = { 268 /* Device interface */ 269 DEVMETHOD(device_probe, bus_generic_probe), 270 DEVMETHOD(device_attach, bus_generic_attach), 271 DEVMETHOD(device_detach, bus_generic_detach), 272 DEVMETHOD(device_shutdown, bus_generic_shutdown), 273 DEVMETHOD(device_suspend, bus_generic_suspend), 274 DEVMETHOD(device_resume, bus_generic_resume), 275 276 /* Bus interface */ 277 DEVMETHOD(bus_read_ivar, cpu_read_ivar), 278 DEVMETHOD(bus_print_child, bus_generic_print_child), 279 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 280 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 281 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 282 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 283 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 284 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 285 286 { 0, 0 } 287 }; 288 289 static driver_t cpu_driver = { 290 "cpu", 291 cpu_methods, 292 1, /* no softc */ 293 }; 294 static devclass_t cpu_devclass; 295 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0); 296 297 static int 298 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 299 { 300 struct pcpu *pc; 301 302 if (index != 0) 303 return (ENOENT); 304 pc = device_get_ivars(child); 305 if (pc == NULL) 306 return (ENOENT); 307 *result = (uintptr_t)pc; 308 return (0); 309 }
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