]>
Commit | Line | Data |
---|---|---|
c767a54b JP |
1 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
2 | ||
1da177e4 | 3 | #include <linux/module.h> |
cd6ed525 | 4 | #include <linux/reboot.h> |
4d022e35 MB |
5 | #include <linux/init.h> |
6 | #include <linux/pm.h> | |
7 | #include <linux/efi.h> | |
6c6c51e4 | 8 | #include <linux/dmi.h> |
d43c36dc | 9 | #include <linux/sched.h> |
69575d38 | 10 | #include <linux/tboot.h> |
ca444564 | 11 | #include <linux/delay.h> |
4d022e35 MB |
12 | #include <acpi/reboot.h> |
13 | #include <asm/io.h> | |
1da177e4 | 14 | #include <asm/apic.h> |
8643e28d | 15 | #include <asm/io_apic.h> |
4d37e7e3 | 16 | #include <asm/desc.h> |
4d022e35 | 17 | #include <asm/hpet.h> |
68db065c | 18 | #include <asm/pgtable.h> |
4412620f | 19 | #include <asm/proto.h> |
973efae2 | 20 | #include <asm/reboot_fixups.h> |
07f3331c | 21 | #include <asm/reboot.h> |
82487711 | 22 | #include <asm/pci_x86.h> |
d176720d | 23 | #include <asm/virtext.h> |
96b89dc6 | 24 | #include <asm/cpu.h> |
c410b830 | 25 | #include <asm/nmi.h> |
65051397 | 26 | #include <asm/smp.h> |
1da177e4 | 27 | |
65051397 PA |
28 | #include <linux/ctype.h> |
29 | #include <linux/mc146818rtc.h> | |
30 | #include <asm/realmode.h> | |
31 | #include <asm/x86_init.h> | |
44be28e9 | 32 | #include <asm/efi.h> |
4d022e35 | 33 | |
1da177e4 LT |
34 | /* |
35 | * Power off function, if any | |
36 | */ | |
37 | void (*pm_power_off)(void); | |
129f6946 | 38 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 | 39 | |
ebdd561a | 40 | static const struct desc_ptr no_idt = {}; |
4d022e35 | 41 | |
144d102b ML |
42 | /* |
43 | * This is set if we need to go through the 'emergency' path. | |
d176720d EH |
44 | * When machine_emergency_restart() is called, we may be on |
45 | * an inconsistent state and won't be able to do a clean cleanup | |
46 | */ | |
47 | static int reboot_emergency; | |
48 | ||
14d7ca5c PA |
49 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
50 | bool port_cf9_safe = false; | |
51 | ||
1da177e4 LT |
52 | /* |
53 | * Reboot options and system auto-detection code provided by | |
54 | * Dell Inc. so their systems "just work". :-) | |
55 | */ | |
56 | ||
57 | /* | |
1ef03890 | 58 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 59 | * this quirk makes that automatic. |
1da177e4 | 60 | */ |
1855256c | 61 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 62 | { |
4d022e35 MB |
63 | if (reboot_type != BOOT_BIOS) { |
64 | reboot_type = BOOT_BIOS; | |
c767a54b | 65 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 66 | d->ident, "BIOS"); |
1da177e4 LT |
67 | } |
68 | return 0; | |
69 | } | |
70 | ||
65051397 | 71 | void __noreturn machine_real_restart(unsigned int type) |
57b16594 | 72 | { |
57b16594 ML |
73 | local_irq_disable(); |
74 | ||
144d102b ML |
75 | /* |
76 | * Write zero to CMOS register number 0x0f, which the BIOS POST | |
77 | * routine will recognize as telling it to do a proper reboot. (Well | |
78 | * that's what this book in front of me says -- it may only apply to | |
79 | * the Phoenix BIOS though, it's not clear). At the same time, | |
80 | * disable NMIs by setting the top bit in the CMOS address register, | |
81 | * as we're about to do peculiar things to the CPU. I'm not sure if | |
82 | * `outb_p' is needed instead of just `outb'. Use it to be on the | |
83 | * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
57b16594 ML |
84 | */ |
85 | spin_lock(&rtc_lock); | |
86 | CMOS_WRITE(0x00, 0x8f); | |
87 | spin_unlock(&rtc_lock); | |
88 | ||
89 | /* | |
90 | * Switch back to the initial page table. | |
91 | */ | |
65051397 | 92 | #ifdef CONFIG_X86_32 |
57b16594 | 93 | load_cr3(initial_page_table); |
65051397 PA |
94 | #else |
95 | write_cr3(real_mode_header->trampoline_pgd); | |
96 | #endif | |
57b16594 | 97 | |
57b16594 | 98 | /* Jump to the identity-mapped low memory code */ |
65051397 PA |
99 | #ifdef CONFIG_X86_32 |
100 | asm volatile("jmpl *%0" : : | |
101 | "rm" (real_mode_header->machine_real_restart_asm), | |
102 | "a" (type)); | |
103 | #else | |
104 | asm volatile("ljmpl *%0" : : | |
105 | "m" (real_mode_header->machine_real_restart_asm), | |
106 | "D" (type)); | |
107 | #endif | |
108 | unreachable(); | |
57b16594 ML |
109 | } |
110 | #ifdef CONFIG_APM_MODULE | |
111 | EXPORT_SYMBOL(machine_real_restart); | |
112 | #endif | |
113 | ||
57b16594 ML |
114 | /* |
115 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot | |
116 | */ | |
117 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
118 | { | |
5be44a6f IM |
119 | if (reboot_type != BOOT_CF9_FORCE) { |
120 | reboot_type = BOOT_CF9_FORCE; | |
c767a54b | 121 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 122 | d->ident, "PCI"); |
57b16594 ML |
123 | } |
124 | return 0; | |
125 | } | |
126 | ||
1ef03890 PC |
127 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
128 | { | |
129 | if (reboot_type != BOOT_KBD) { | |
130 | reboot_type = BOOT_KBD; | |
c767a54b | 131 | pr_info("%s series board detected. Selecting %s-method for reboot.\n", |
6d9153bb | 132 | d->ident, "KBD"); |
1ef03890 PC |
133 | } |
134 | return 0; | |
135 | } | |
136 | ||
144d102b | 137 | /* |
65051397 | 138 | * This is a single dmi_table handling all reboot quirks. |
57b16594 | 139 | */ |
1da177e4 | 140 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
e56e57f6 DJ |
141 | |
142 | /* Acer */ | |
143 | { /* Handle reboot issue on Acer Aspire one */ | |
144 | .callback = set_kbd_reboot, | |
145 | .ident = "Acer Aspire One A110", | |
b9e82af8 | 146 | .matches = { |
e56e57f6 DJ |
147 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
148 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
b9e82af8 TG |
149 | }, |
150 | }, | |
e56e57f6 DJ |
151 | |
152 | /* Apple */ | |
153 | { /* Handle problems with rebooting on Apple MacBook5 */ | |
154 | .callback = set_pci_reboot, | |
155 | .ident = "Apple MacBook5", | |
1da177e4 | 156 | .matches = { |
e56e57f6 DJ |
157 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
158 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), | |
1da177e4 LT |
159 | }, |
160 | }, | |
e56e57f6 DJ |
161 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
162 | .callback = set_pci_reboot, | |
163 | .ident = "Apple MacBookPro5", | |
1da177e4 | 164 | .matches = { |
e56e57f6 DJ |
165 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
166 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), | |
1da177e4 LT |
167 | }, |
168 | }, | |
e56e57f6 DJ |
169 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
170 | .callback = set_pci_reboot, | |
171 | .ident = "Apple Macmini3,1", | |
df2edcf3 | 172 | .matches = { |
e56e57f6 DJ |
173 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
174 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
df2edcf3 JJ |
175 | }, |
176 | }, | |
e56e57f6 DJ |
177 | { /* Handle problems with rebooting on the iMac9,1. */ |
178 | .callback = set_pci_reboot, | |
179 | .ident = "Apple iMac9,1", | |
fc115bf1 | 180 | .matches = { |
e56e57f6 DJ |
181 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
182 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
fc115bf1 CK |
183 | }, |
184 | }, | |
e56e57f6 | 185 | |
80313b30 SLH |
186 | /* ASRock */ |
187 | { /* Handle problems with rebooting on ASRock Q1900DC-ITX */ | |
188 | .callback = set_pci_reboot, | |
189 | .ident = "ASRock Q1900DC-ITX", | |
190 | .matches = { | |
191 | DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"), | |
192 | DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"), | |
193 | }, | |
194 | }, | |
195 | ||
e56e57f6 DJ |
196 | /* ASUS */ |
197 | { /* Handle problems with rebooting on ASUS P4S800 */ | |
fc1c8925 | 198 | .callback = set_bios_reboot, |
e56e57f6 | 199 | .ident = "ASUS P4S800", |
fc1c8925 | 200 | .matches = { |
e56e57f6 DJ |
201 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
202 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
fc1c8925 HAA |
203 | }, |
204 | }, | |
e56e57f6 | 205 | |
aadca6fa CG |
206 | /* Certec */ |
207 | { /* Handle problems with rebooting on Certec BPC600 */ | |
208 | .callback = set_pci_reboot, | |
209 | .ident = "Certec BPC600", | |
210 | .matches = { | |
211 | DMI_MATCH(DMI_SYS_VENDOR, "Certec"), | |
212 | DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"), | |
213 | }, | |
214 | }, | |
215 | ||
e56e57f6 DJ |
216 | /* Dell */ |
217 | { /* Handle problems with rebooting on Dell DXP061 */ | |
093bac15 | 218 | .callback = set_bios_reboot, |
e56e57f6 | 219 | .ident = "Dell DXP061", |
093bac15 SC |
220 | .matches = { |
221 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 222 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), |
093bac15 SC |
223 | }, |
224 | }, | |
e56e57f6 | 225 | { /* Handle problems with rebooting on Dell E520's */ |
4a4aca64 | 226 | .callback = set_bios_reboot, |
e56e57f6 | 227 | .ident = "Dell E520", |
4a4aca64 JD |
228 | .matches = { |
229 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 230 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), |
4a4aca64 JD |
231 | }, |
232 | }, | |
986189f9 LT |
233 | { /* Handle problems with rebooting on the Latitude E5410. */ |
234 | .callback = set_pci_reboot, | |
235 | .ident = "Dell Latitude E5410", | |
35ea63d7 LO |
236 | .matches = { |
237 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
986189f9 | 238 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"), |
35ea63d7 LO |
239 | }, |
240 | }, | |
e56e57f6 DJ |
241 | { /* Handle problems with rebooting on the Latitude E5420. */ |
242 | .callback = set_pci_reboot, | |
243 | .ident = "Dell Latitude E5420", | |
1da177e4 | 244 | .matches = { |
35ea63d7 | 245 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 | 246 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), |
1da177e4 LT |
247 | }, |
248 | }, | |
e56e57f6 DJ |
249 | { /* Handle problems with rebooting on the Latitude E6320. */ |
250 | .callback = set_pci_reboot, | |
251 | .ident = "Dell Latitude E6320", | |
fab3b58d IM |
252 | .matches = { |
253 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 254 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), |
fab3b58d IM |
255 | }, |
256 | }, | |
e56e57f6 DJ |
257 | { /* Handle problems with rebooting on the Latitude E6420. */ |
258 | .callback = set_pci_reboot, | |
259 | .ident = "Dell Latitude E6420", | |
890ffedc TB |
260 | .matches = { |
261 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 262 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), |
890ffedc TB |
263 | }, |
264 | }, | |
e56e57f6 | 265 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
d91b14c4 | 266 | .callback = set_bios_reboot, |
e56e57f6 | 267 | .ident = "Dell OptiPlex 330", |
d91b14c4 | 268 | .matches = { |
890ffedc | 269 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
270 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), |
271 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
d91b14c4 TV |
272 | }, |
273 | }, | |
e56e57f6 | 274 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
dd4124a8 | 275 | .callback = set_bios_reboot, |
e56e57f6 | 276 | .ident = "Dell OptiPlex 360", |
dd4124a8 LO |
277 | .matches = { |
278 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 DJ |
279 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), |
280 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
dd4124a8 LO |
281 | }, |
282 | }, | |
e56e57f6 | 283 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
c5da9a2b | 284 | .callback = set_bios_reboot, |
e56e57f6 | 285 | .ident = "Dell OptiPlex 745", |
c5da9a2b AC |
286 | .matches = { |
287 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 288 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
c5da9a2b AC |
289 | }, |
290 | }, | |
e56e57f6 | 291 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
88dff493 | 292 | .callback = set_bios_reboot, |
e56e57f6 | 293 | .ident = "Dell OptiPlex 745", |
88dff493 | 294 | .matches = { |
c5da9a2b | 295 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
296 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
297 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
88dff493 ZR |
298 | }, |
299 | }, | |
e56e57f6 | 300 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
4832ddda | 301 | .callback = set_bios_reboot, |
e56e57f6 | 302 | .ident = "Dell OptiPlex 745", |
b49c78d4 | 303 | .matches = { |
e56e57f6 DJ |
304 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
305 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
306 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
b49c78d4 PC |
307 | }, |
308 | }, | |
e56e57f6 | 309 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
4832ddda | 310 | .callback = set_bios_reboot, |
e56e57f6 | 311 | .ident = "Dell OptiPlex 760", |
6c6c51e4 | 312 | .matches = { |
e56e57f6 DJ |
313 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
314 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
315 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
6c6c51e4 PM |
316 | }, |
317 | }, | |
e56e57f6 | 318 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
498cdbfb | 319 | .callback = set_pci_reboot, |
e56e57f6 | 320 | .ident = "Dell OptiPlex 990", |
498cdbfb | 321 | .matches = { |
e56e57f6 DJ |
322 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
323 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
498cdbfb OÇ |
324 | }, |
325 | }, | |
e56e57f6 DJ |
326 | { /* Handle problems with rebooting on Dell 300's */ |
327 | .callback = set_bios_reboot, | |
328 | .ident = "Dell PowerEdge 300", | |
05154752 | 329 | .matches = { |
e56e57f6 DJ |
330 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
331 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
05154752 GH |
332 | }, |
333 | }, | |
e56e57f6 DJ |
334 | { /* Handle problems with rebooting on Dell 1300's */ |
335 | .callback = set_bios_reboot, | |
336 | .ident = "Dell PowerEdge 1300", | |
0a832320 | 337 | .matches = { |
e56e57f6 DJ |
338 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
339 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
0a832320 JM |
340 | }, |
341 | }, | |
e56e57f6 DJ |
342 | { /* Handle problems with rebooting on Dell 2400's */ |
343 | .callback = set_bios_reboot, | |
344 | .ident = "Dell PowerEdge 2400", | |
3628c3f5 | 345 | .matches = { |
e56e57f6 DJ |
346 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
347 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
3628c3f5 MR |
348 | }, |
349 | }, | |
e56e57f6 | 350 | { /* Handle problems with rebooting on the Dell PowerEdge C6100. */ |
8412da75 | 351 | .callback = set_pci_reboot, |
e56e57f6 | 352 | .ident = "Dell PowerEdge C6100", |
8412da75 | 353 | .matches = { |
e56e57f6 DJ |
354 | DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
355 | DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), | |
8412da75 VS |
356 | }, |
357 | }, | |
e56e57f6 | 358 | { /* Handle problems with rebooting on the Precision M6600. */ |
b7798d28 | 359 | .callback = set_pci_reboot, |
e56e57f6 | 360 | .ident = "Dell Precision M6600", |
b7798d28 DB |
361 | .matches = { |
362 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 363 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), |
b7798d28 DB |
364 | }, |
365 | }, | |
e56e57f6 DJ |
366 | { /* Handle problems with rebooting on Dell T5400's */ |
367 | .callback = set_bios_reboot, | |
368 | .ident = "Dell Precision T5400", | |
a536877e PA |
369 | .matches = { |
370 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 371 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), |
a536877e PA |
372 | }, |
373 | }, | |
e56e57f6 DJ |
374 | { /* Handle problems with rebooting on Dell T7400's */ |
375 | .callback = set_bios_reboot, | |
376 | .ident = "Dell Precision T7400", | |
6be30bb7 RW |
377 | .matches = { |
378 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 379 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), |
6be30bb7 RW |
380 | }, |
381 | }, | |
e56e57f6 DJ |
382 | { /* Handle problems with rebooting on Dell XPS710 */ |
383 | .callback = set_bios_reboot, | |
384 | .ident = "Dell XPS710", | |
76eb9a30 ZR |
385 | .matches = { |
386 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 387 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), |
76eb9a30 ZR |
388 | }, |
389 | }, | |
e56e57f6 DJ |
390 | |
391 | /* Hewlett-Packard */ | |
392 | { /* Handle problems with rebooting on HP laptops */ | |
393 | .callback = set_bios_reboot, | |
394 | .ident = "HP Compaq Laptop", | |
4f0acd31 | 395 | .matches = { |
e56e57f6 DJ |
396 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
397 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), | |
4f0acd31 MS |
398 | }, |
399 | }, | |
e56e57f6 DJ |
400 | |
401 | /* Sony */ | |
402 | { /* Handle problems with rebooting on Sony VGN-Z540N */ | |
403 | .callback = set_bios_reboot, | |
404 | .ident = "Sony VGN-Z540N", | |
4f0acd31 | 405 | .matches = { |
e56e57f6 DJ |
406 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
407 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
4f0acd31 MS |
408 | }, |
409 | }, | |
e56e57f6 | 410 | |
6c6c51e4 PM |
411 | { } |
412 | }; | |
413 | ||
57b16594 | 414 | static int __init reboot_init(void) |
6c6c51e4 | 415 | { |
44be28e9 MF |
416 | int rv; |
417 | ||
144d102b ML |
418 | /* |
419 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
420 | * on the command line |
421 | */ | |
44be28e9 MF |
422 | if (!reboot_default) |
423 | return 0; | |
424 | ||
425 | /* | |
426 | * The DMI quirks table takes precedence. If no quirks entry | |
427 | * matches and the ACPI Hardware Reduced bit is set, force EFI | |
428 | * reboot. | |
429 | */ | |
430 | rv = dmi_check_system(reboot_dmi_table); | |
431 | ||
432 | if (!rv && efi_reboot_required()) | |
433 | reboot_type = BOOT_EFI; | |
434 | ||
6c6c51e4 PM |
435 | return 0; |
436 | } | |
57b16594 | 437 | core_initcall(reboot_init); |
6c6c51e4 | 438 | |
4d022e35 MB |
439 | static inline void kb_wait(void) |
440 | { | |
441 | int i; | |
442 | ||
c84d6af8 AC |
443 | for (i = 0; i < 0x10000; i++) { |
444 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 445 | break; |
c84d6af8 AC |
446 | udelay(2); |
447 | } | |
4d022e35 MB |
448 | } |
449 | ||
9c48f1c6 | 450 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
451 | { |
452 | cpu_emergency_vmxoff(); | |
453 | } | |
454 | ||
144d102b | 455 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
456 | static void emergency_vmx_disable_all(void) |
457 | { | |
458 | /* Just make sure we won't change CPUs while doing this */ | |
459 | local_irq_disable(); | |
460 | ||
144d102b ML |
461 | /* |
462 | * We need to disable VMX on all CPUs before rebooting, otherwise | |
d176720d EH |
463 | * we risk hanging up the machine, because the CPU ignore INIT |
464 | * signals when VMX is enabled. | |
465 | * | |
466 | * We can't take any locks and we may be on an inconsistent | |
467 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
468 | * VMX and halt. | |
469 | * | |
470 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
471 | * stuff unnecessarily, but we don't have a way to check | |
472 | * if other CPUs have VMX enabled. So we will call it only if the | |
473 | * CPU we are running on has VMX enabled. | |
474 | * | |
475 | * We will miss cases where VMX is not enabled on all CPUs. This | |
476 | * shouldn't do much harm because KVM always enable VMX on all | |
477 | * CPUs anyway. But we can miss it on the small window where KVM | |
478 | * is still enabling VMX. | |
479 | */ | |
480 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
144d102b | 481 | /* Disable VMX on this CPU. */ |
d176720d EH |
482 | cpu_vmxoff(); |
483 | ||
484 | /* Halt and disable VMX on the other CPUs */ | |
485 | nmi_shootdown_cpus(vmxoff_nmi); | |
486 | ||
487 | } | |
488 | } | |
489 | ||
490 | ||
7432d149 IM |
491 | void __attribute__((weak)) mach_reboot_fixups(void) |
492 | { | |
493 | } | |
494 | ||
660e34ce | 495 | /* |
5be44a6f IM |
496 | * To the best of our knowledge Windows compatible x86 hardware expects |
497 | * the following on reboot: | |
660e34ce MG |
498 | * |
499 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
500 | * 2) If still alive, write to the keyboard controller | |
501 | * 3) If still alive, write to the ACPI reboot register again | |
502 | * 4) If still alive, write to the keyboard controller again | |
a4f1987e | 503 | * 5) If still alive, call the EFI runtime service to reboot |
5be44a6f | 504 | * 6) If no EFI runtime service, call the BIOS to do a reboot |
660e34ce | 505 | * |
5be44a6f IM |
506 | * We default to following the same pattern. We also have |
507 | * two other reboot methods: 'triple fault' and 'PCI', which | |
508 | * can be triggered via the reboot= kernel boot option or | |
509 | * via quirks. | |
510 | * | |
511 | * This means that this function can never return, it can misbehave | |
512 | * by not rebooting properly and hanging. | |
660e34ce | 513 | */ |
416e2d63 | 514 | static void native_machine_emergency_restart(void) |
1da177e4 | 515 | { |
4d022e35 | 516 | int i; |
660e34ce MG |
517 | int attempt = 0; |
518 | int orig_reboot_type = reboot_type; | |
edf2b139 | 519 | unsigned short mode; |
4d022e35 | 520 | |
d176720d EH |
521 | if (reboot_emergency) |
522 | emergency_vmx_disable_all(); | |
523 | ||
840c2baf JC |
524 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
525 | ||
4d022e35 | 526 | /* Tell the BIOS if we want cold or warm reboot */ |
edf2b139 RH |
527 | mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
528 | *((unsigned short *)__va(0x472)) = mode; | |
4d022e35 MB |
529 | |
530 | for (;;) { | |
531 | /* Could also try the reset bit in the Hammer NB */ | |
532 | switch (reboot_type) { | |
5be44a6f IM |
533 | case BOOT_ACPI: |
534 | acpi_reboot(); | |
535 | reboot_type = BOOT_KBD; | |
536 | break; | |
537 | ||
4d022e35 | 538 | case BOOT_KBD: |
144d102b | 539 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 540 | |
4d022e35 MB |
541 | for (i = 0; i < 10; i++) { |
542 | kb_wait(); | |
543 | udelay(50); | |
144d102b | 544 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
545 | udelay(50); |
546 | } | |
660e34ce MG |
547 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
548 | attempt = 1; | |
549 | reboot_type = BOOT_ACPI; | |
550 | } else { | |
a4f1987e | 551 | reboot_type = BOOT_EFI; |
660e34ce MG |
552 | } |
553 | break; | |
4d022e35 | 554 | |
4d022e35 | 555 | case BOOT_EFI: |
8562c99c | 556 | efi_reboot(reboot_mode, NULL); |
5be44a6f IM |
557 | reboot_type = BOOT_BIOS; |
558 | break; | |
559 | ||
560 | case BOOT_BIOS: | |
561 | machine_real_restart(MRR_BIOS); | |
562 | ||
563 | /* We're probably dead after this, but... */ | |
564 | reboot_type = BOOT_CF9_SAFE; | |
14d7ca5c | 565 | break; |
4d022e35 | 566 | |
5be44a6f | 567 | case BOOT_CF9_FORCE: |
14d7ca5c | 568 | port_cf9_safe = true; |
144d102b | 569 | /* Fall through */ |
4d022e35 | 570 | |
5be44a6f | 571 | case BOOT_CF9_SAFE: |
14d7ca5c | 572 | if (port_cf9_safe) { |
5be44a6f | 573 | u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E; |
16c21ae5 | 574 | u8 cf9 = inb(0xcf9) & ~reboot_code; |
14d7ca5c PA |
575 | outb(cf9|2, 0xcf9); /* Request hard reset */ |
576 | udelay(50); | |
16c21ae5 LF |
577 | /* Actually do the reset */ |
578 | outb(cf9|reboot_code, 0xcf9); | |
14d7ca5c PA |
579 | udelay(50); |
580 | } | |
5be44a6f IM |
581 | reboot_type = BOOT_TRIPLE; |
582 | break; | |
583 | ||
584 | case BOOT_TRIPLE: | |
585 | load_idt(&no_idt); | |
586 | __asm__ __volatile__("int3"); | |
587 | ||
588 | /* We're probably dead after this, but... */ | |
589 | reboot_type = BOOT_KBD; | |
4d022e35 MB |
590 | break; |
591 | } | |
592 | } | |
593 | } | |
594 | ||
3c62c625 | 595 | void native_machine_shutdown(void) |
4d022e35 MB |
596 | { |
597 | /* Stop the cpus and apics */ | |
522e6646 | 598 | #ifdef CONFIG_X86_IO_APIC |
2885432a FY |
599 | /* |
600 | * Disabling IO APIC before local APIC is a workaround for | |
601 | * erratum AVR31 in "Intel Atom Processor C2000 Product Family | |
602 | * Specification Update". In this situation, interrupts that target | |
603 | * a Logical Processor whose Local APIC is either in the process of | |
604 | * being hardware disabled or software disabled are neither delivered | |
605 | * nor discarded. When this erratum occurs, the processor may hang. | |
606 | * | |
607 | * Even without the erratum, it still makes sense to quiet IO APIC | |
608 | * before disabling Local APIC. | |
609 | */ | |
522e6646 FY |
610 | disable_IO_APIC(); |
611 | #endif | |
612 | ||
1da177e4 | 613 | #ifdef CONFIG_SMP |
144d102b | 614 | /* |
1b3a5d02 RH |
615 | * Stop all of the others. Also disable the local irq to |
616 | * not receive the per-cpu timer interrupt which may trigger | |
617 | * scheduler's load balance. | |
1da177e4 | 618 | */ |
55c844a4 | 619 | local_irq_disable(); |
76fac077 | 620 | stop_other_cpus(); |
4d022e35 | 621 | #endif |
1da177e4 LT |
622 | |
623 | lapic_shutdown(); | |
624 | ||
c86c7fbc OH |
625 | #ifdef CONFIG_HPET_TIMER |
626 | hpet_disable(); | |
627 | #endif | |
dd2a1305 | 628 | |
4d022e35 | 629 | #ifdef CONFIG_X86_64 |
338bac52 | 630 | x86_platform.iommu_shutdown(); |
4d022e35 | 631 | #endif |
973efae2 JF |
632 | } |
633 | ||
d176720d EH |
634 | static void __machine_emergency_restart(int emergency) |
635 | { | |
636 | reboot_emergency = emergency; | |
637 | machine_ops.emergency_restart(); | |
638 | } | |
639 | ||
416e2d63 | 640 | static void native_machine_restart(char *__unused) |
dd2a1305 | 641 | { |
c767a54b | 642 | pr_notice("machine restart\n"); |
1da177e4 | 643 | |
4d022e35 MB |
644 | if (!reboot_force) |
645 | machine_shutdown(); | |
d176720d | 646 | __machine_emergency_restart(0); |
4a1421f8 EB |
647 | } |
648 | ||
416e2d63 | 649 | static void native_machine_halt(void) |
1da177e4 | 650 | { |
144d102b | 651 | /* Stop other cpus and apics */ |
d3ec5cae IV |
652 | machine_shutdown(); |
653 | ||
840c2baf JC |
654 | tboot_shutdown(TB_SHUTDOWN_HALT); |
655 | ||
d3ec5cae | 656 | stop_this_cpu(NULL); |
1da177e4 LT |
657 | } |
658 | ||
416e2d63 | 659 | static void native_machine_power_off(void) |
1da177e4 | 660 | { |
6e3fbee5 | 661 | if (pm_power_off) { |
4d022e35 MB |
662 | if (!reboot_force) |
663 | machine_shutdown(); | |
1da177e4 | 664 | pm_power_off(); |
6e3fbee5 | 665 | } |
144d102b | 666 | /* A fallback in case there is no PM info available */ |
840c2baf | 667 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
668 | } |
669 | ||
07f3331c | 670 | struct machine_ops machine_ops = { |
416e2d63 JB |
671 | .power_off = native_machine_power_off, |
672 | .shutdown = native_machine_shutdown, | |
673 | .emergency_restart = native_machine_emergency_restart, | |
674 | .restart = native_machine_restart, | |
ed23dc6f GC |
675 | .halt = native_machine_halt, |
676 | #ifdef CONFIG_KEXEC | |
677 | .crash_shutdown = native_machine_crash_shutdown, | |
678 | #endif | |
07f3331c | 679 | }; |
416e2d63 JB |
680 | |
681 | void machine_power_off(void) | |
682 | { | |
683 | machine_ops.power_off(); | |
684 | } | |
685 | ||
686 | void machine_shutdown(void) | |
687 | { | |
688 | machine_ops.shutdown(); | |
689 | } | |
690 | ||
691 | void machine_emergency_restart(void) | |
692 | { | |
d176720d | 693 | __machine_emergency_restart(1); |
416e2d63 JB |
694 | } |
695 | ||
696 | void machine_restart(char *cmd) | |
697 | { | |
698 | machine_ops.restart(cmd); | |
699 | } | |
700 | ||
701 | void machine_halt(void) | |
702 | { | |
703 | machine_ops.halt(); | |
704 | } | |
705 | ||
ed23dc6f GC |
706 | #ifdef CONFIG_KEXEC |
707 | void machine_crash_shutdown(struct pt_regs *regs) | |
708 | { | |
709 | machine_ops.crash_shutdown(regs); | |
710 | } | |
711 | #endif | |
2ddded21 EH |
712 | |
713 | ||
bb8dd270 | 714 | #if defined(CONFIG_SMP) |
2ddded21 EH |
715 | |
716 | /* This keeps a track of which one is crashing cpu. */ | |
717 | static int crashing_cpu; | |
718 | static nmi_shootdown_cb shootdown_callback; | |
719 | ||
720 | static atomic_t waiting_for_crash_ipi; | |
721 | ||
9c48f1c6 | 722 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
723 | { |
724 | int cpu; | |
725 | ||
2ddded21 EH |
726 | cpu = raw_smp_processor_id(); |
727 | ||
144d102b ML |
728 | /* |
729 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
730 | * Otherwise, system will completely hang. Crashing cpu can get |
731 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
732 | */ | |
733 | if (cpu == crashing_cpu) | |
9c48f1c6 | 734 | return NMI_HANDLED; |
2ddded21 EH |
735 | local_irq_disable(); |
736 | ||
9c48f1c6 | 737 | shootdown_callback(cpu, regs); |
2ddded21 EH |
738 | |
739 | atomic_dec(&waiting_for_crash_ipi); | |
740 | /* Assume hlt works */ | |
741 | halt(); | |
742 | for (;;) | |
743 | cpu_relax(); | |
744 | ||
9c48f1c6 | 745 | return NMI_HANDLED; |
2ddded21 EH |
746 | } |
747 | ||
748 | static void smp_send_nmi_allbutself(void) | |
749 | { | |
dac5f412 | 750 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
751 | } |
752 | ||
144d102b ML |
753 | /* |
754 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
755 | * |
756 | * This function can be used to halt all other CPUs on crash | |
757 | * or emergency reboot time. The function passed as parameter | |
758 | * will be called inside a NMI handler on all CPUs. | |
759 | */ | |
2ddded21 EH |
760 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
761 | { | |
762 | unsigned long msecs; | |
c415b3dc | 763 | local_irq_disable(); |
2ddded21 | 764 | |
144d102b | 765 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
766 | crashing_cpu = safe_smp_processor_id(); |
767 | ||
768 | shootdown_callback = callback; | |
769 | ||
770 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
771 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
772 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
773 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
774 | return; /* Return what? */ |
775 | /* | |
776 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
777 | * out the NMI |
778 | */ | |
779 | wmb(); | |
780 | ||
781 | smp_send_nmi_allbutself(); | |
782 | ||
783 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
784 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
785 | mdelay(1); | |
786 | msecs--; | |
787 | } | |
788 | ||
789 | /* Leave the nmi callback set */ | |
790 | } | |
bb8dd270 EH |
791 | #else /* !CONFIG_SMP */ |
792 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
793 | { | |
794 | /* No other CPUs to shoot down */ | |
795 | } | |
2ddded21 | 796 | #endif |