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> |
4d37e7e3 | 15 | #include <asm/desc.h> |
4d022e35 | 16 | #include <asm/hpet.h> |
68db065c | 17 | #include <asm/pgtable.h> |
4412620f | 18 | #include <asm/proto.h> |
973efae2 | 19 | #include <asm/reboot_fixups.h> |
07f3331c | 20 | #include <asm/reboot.h> |
82487711 | 21 | #include <asm/pci_x86.h> |
d176720d | 22 | #include <asm/virtext.h> |
96b89dc6 | 23 | #include <asm/cpu.h> |
c410b830 | 24 | #include <asm/nmi.h> |
65051397 | 25 | #include <asm/smp.h> |
1da177e4 | 26 | |
65051397 PA |
27 | #include <linux/ctype.h> |
28 | #include <linux/mc146818rtc.h> | |
29 | #include <asm/realmode.h> | |
30 | #include <asm/x86_init.h> | |
4d022e35 | 31 | |
1da177e4 LT |
32 | /* |
33 | * Power off function, if any | |
34 | */ | |
35 | void (*pm_power_off)(void); | |
129f6946 | 36 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 | 37 | |
ebdd561a | 38 | static const struct desc_ptr no_idt = {}; |
4d022e35 | 39 | |
144d102b ML |
40 | /* |
41 | * This is set if we need to go through the 'emergency' path. | |
d176720d EH |
42 | * When machine_emergency_restart() is called, we may be on |
43 | * an inconsistent state and won't be able to do a clean cleanup | |
44 | */ | |
45 | static int reboot_emergency; | |
46 | ||
14d7ca5c PA |
47 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
48 | bool port_cf9_safe = false; | |
49 | ||
1da177e4 LT |
50 | /* |
51 | * Reboot options and system auto-detection code provided by | |
52 | * Dell Inc. so their systems "just work". :-) | |
53 | */ | |
54 | ||
55 | /* | |
1ef03890 | 56 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 57 | * this quirk makes that automatic. |
1da177e4 | 58 | */ |
1855256c | 59 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 60 | { |
4d022e35 MB |
61 | if (reboot_type != BOOT_BIOS) { |
62 | reboot_type = BOOT_BIOS; | |
c767a54b | 63 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 64 | d->ident, "BIOS"); |
1da177e4 LT |
65 | } |
66 | return 0; | |
67 | } | |
68 | ||
65051397 | 69 | void __noreturn machine_real_restart(unsigned int type) |
57b16594 | 70 | { |
57b16594 ML |
71 | local_irq_disable(); |
72 | ||
144d102b ML |
73 | /* |
74 | * Write zero to CMOS register number 0x0f, which the BIOS POST | |
75 | * routine will recognize as telling it to do a proper reboot. (Well | |
76 | * that's what this book in front of me says -- it may only apply to | |
77 | * the Phoenix BIOS though, it's not clear). At the same time, | |
78 | * disable NMIs by setting the top bit in the CMOS address register, | |
79 | * as we're about to do peculiar things to the CPU. I'm not sure if | |
80 | * `outb_p' is needed instead of just `outb'. Use it to be on the | |
81 | * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
57b16594 ML |
82 | */ |
83 | spin_lock(&rtc_lock); | |
84 | CMOS_WRITE(0x00, 0x8f); | |
85 | spin_unlock(&rtc_lock); | |
86 | ||
87 | /* | |
88 | * Switch back to the initial page table. | |
89 | */ | |
65051397 | 90 | #ifdef CONFIG_X86_32 |
57b16594 | 91 | load_cr3(initial_page_table); |
65051397 PA |
92 | #else |
93 | write_cr3(real_mode_header->trampoline_pgd); | |
94 | #endif | |
57b16594 | 95 | |
57b16594 | 96 | /* Jump to the identity-mapped low memory code */ |
65051397 PA |
97 | #ifdef CONFIG_X86_32 |
98 | asm volatile("jmpl *%0" : : | |
99 | "rm" (real_mode_header->machine_real_restart_asm), | |
100 | "a" (type)); | |
101 | #else | |
102 | asm volatile("ljmpl *%0" : : | |
103 | "m" (real_mode_header->machine_real_restart_asm), | |
104 | "D" (type)); | |
105 | #endif | |
106 | unreachable(); | |
57b16594 ML |
107 | } |
108 | #ifdef CONFIG_APM_MODULE | |
109 | EXPORT_SYMBOL(machine_real_restart); | |
110 | #endif | |
111 | ||
57b16594 ML |
112 | /* |
113 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot | |
114 | */ | |
115 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
116 | { | |
5be44a6f IM |
117 | if (reboot_type != BOOT_CF9_FORCE) { |
118 | reboot_type = BOOT_CF9_FORCE; | |
c767a54b | 119 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 120 | d->ident, "PCI"); |
57b16594 ML |
121 | } |
122 | return 0; | |
123 | } | |
124 | ||
1ef03890 PC |
125 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
126 | { | |
127 | if (reboot_type != BOOT_KBD) { | |
128 | reboot_type = BOOT_KBD; | |
c767a54b | 129 | pr_info("%s series board detected. Selecting %s-method for reboot.\n", |
6d9153bb | 130 | d->ident, "KBD"); |
1ef03890 PC |
131 | } |
132 | return 0; | |
133 | } | |
134 | ||
144d102b | 135 | /* |
65051397 | 136 | * This is a single dmi_table handling all reboot quirks. |
57b16594 | 137 | */ |
1da177e4 | 138 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
e56e57f6 DJ |
139 | |
140 | /* Acer */ | |
141 | { /* Handle reboot issue on Acer Aspire one */ | |
142 | .callback = set_kbd_reboot, | |
143 | .ident = "Acer Aspire One A110", | |
b9e82af8 | 144 | .matches = { |
e56e57f6 DJ |
145 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
146 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
b9e82af8 TG |
147 | }, |
148 | }, | |
e56e57f6 DJ |
149 | |
150 | /* Apple */ | |
151 | { /* Handle problems with rebooting on Apple MacBook5 */ | |
152 | .callback = set_pci_reboot, | |
153 | .ident = "Apple MacBook5", | |
1da177e4 | 154 | .matches = { |
e56e57f6 DJ |
155 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
156 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), | |
1da177e4 LT |
157 | }, |
158 | }, | |
e56e57f6 DJ |
159 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
160 | .callback = set_pci_reboot, | |
161 | .ident = "Apple MacBookPro5", | |
1da177e4 | 162 | .matches = { |
e56e57f6 DJ |
163 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
164 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), | |
1da177e4 LT |
165 | }, |
166 | }, | |
e56e57f6 DJ |
167 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
168 | .callback = set_pci_reboot, | |
169 | .ident = "Apple Macmini3,1", | |
df2edcf3 | 170 | .matches = { |
e56e57f6 DJ |
171 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
172 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
df2edcf3 JJ |
173 | }, |
174 | }, | |
e56e57f6 DJ |
175 | { /* Handle problems with rebooting on the iMac9,1. */ |
176 | .callback = set_pci_reboot, | |
177 | .ident = "Apple iMac9,1", | |
fc115bf1 | 178 | .matches = { |
e56e57f6 DJ |
179 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
180 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
fc115bf1 CK |
181 | }, |
182 | }, | |
e56e57f6 DJ |
183 | |
184 | /* ASUS */ | |
185 | { /* Handle problems with rebooting on ASUS P4S800 */ | |
fc1c8925 | 186 | .callback = set_bios_reboot, |
e56e57f6 | 187 | .ident = "ASUS P4S800", |
fc1c8925 | 188 | .matches = { |
e56e57f6 DJ |
189 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
190 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
fc1c8925 HAA |
191 | }, |
192 | }, | |
e56e57f6 DJ |
193 | |
194 | /* Dell */ | |
195 | { /* Handle problems with rebooting on Dell DXP061 */ | |
093bac15 | 196 | .callback = set_bios_reboot, |
e56e57f6 | 197 | .ident = "Dell DXP061", |
093bac15 SC |
198 | .matches = { |
199 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 200 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), |
093bac15 SC |
201 | }, |
202 | }, | |
e56e57f6 | 203 | { /* Handle problems with rebooting on Dell E520's */ |
4a4aca64 | 204 | .callback = set_bios_reboot, |
e56e57f6 | 205 | .ident = "Dell E520", |
4a4aca64 JD |
206 | .matches = { |
207 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 208 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), |
4a4aca64 JD |
209 | }, |
210 | }, | |
986189f9 LT |
211 | { /* Handle problems with rebooting on the Latitude E5410. */ |
212 | .callback = set_pci_reboot, | |
213 | .ident = "Dell Latitude E5410", | |
35ea63d7 LO |
214 | .matches = { |
215 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
986189f9 | 216 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"), |
35ea63d7 LO |
217 | }, |
218 | }, | |
e56e57f6 DJ |
219 | { /* Handle problems with rebooting on the Latitude E5420. */ |
220 | .callback = set_pci_reboot, | |
221 | .ident = "Dell Latitude E5420", | |
1da177e4 | 222 | .matches = { |
35ea63d7 | 223 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 | 224 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), |
1da177e4 LT |
225 | }, |
226 | }, | |
e56e57f6 DJ |
227 | { /* Handle problems with rebooting on the Latitude E6320. */ |
228 | .callback = set_pci_reboot, | |
229 | .ident = "Dell Latitude E6320", | |
fab3b58d IM |
230 | .matches = { |
231 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 232 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), |
fab3b58d IM |
233 | }, |
234 | }, | |
e56e57f6 DJ |
235 | { /* Handle problems with rebooting on the Latitude E6420. */ |
236 | .callback = set_pci_reboot, | |
237 | .ident = "Dell Latitude E6420", | |
890ffedc TB |
238 | .matches = { |
239 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 240 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), |
890ffedc TB |
241 | }, |
242 | }, | |
e56e57f6 | 243 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
d91b14c4 | 244 | .callback = set_bios_reboot, |
e56e57f6 | 245 | .ident = "Dell OptiPlex 330", |
d91b14c4 | 246 | .matches = { |
890ffedc | 247 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
248 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), |
249 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
d91b14c4 TV |
250 | }, |
251 | }, | |
e56e57f6 | 252 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
dd4124a8 | 253 | .callback = set_bios_reboot, |
e56e57f6 | 254 | .ident = "Dell OptiPlex 360", |
dd4124a8 LO |
255 | .matches = { |
256 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 DJ |
257 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), |
258 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
dd4124a8 LO |
259 | }, |
260 | }, | |
e56e57f6 | 261 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
c5da9a2b | 262 | .callback = set_bios_reboot, |
e56e57f6 | 263 | .ident = "Dell OptiPlex 745", |
c5da9a2b AC |
264 | .matches = { |
265 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 266 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
c5da9a2b AC |
267 | }, |
268 | }, | |
e56e57f6 | 269 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
88dff493 | 270 | .callback = set_bios_reboot, |
e56e57f6 | 271 | .ident = "Dell OptiPlex 745", |
88dff493 | 272 | .matches = { |
c5da9a2b | 273 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
274 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
275 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
88dff493 ZR |
276 | }, |
277 | }, | |
e56e57f6 | 278 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
4832ddda | 279 | .callback = set_bios_reboot, |
e56e57f6 | 280 | .ident = "Dell OptiPlex 745", |
b49c78d4 | 281 | .matches = { |
e56e57f6 DJ |
282 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
283 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
284 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
b49c78d4 PC |
285 | }, |
286 | }, | |
e56e57f6 | 287 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
4832ddda | 288 | .callback = set_bios_reboot, |
e56e57f6 | 289 | .ident = "Dell OptiPlex 760", |
6c6c51e4 | 290 | .matches = { |
e56e57f6 DJ |
291 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
292 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
293 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
6c6c51e4 PM |
294 | }, |
295 | }, | |
e56e57f6 | 296 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
498cdbfb | 297 | .callback = set_pci_reboot, |
e56e57f6 | 298 | .ident = "Dell OptiPlex 990", |
498cdbfb | 299 | .matches = { |
e56e57f6 DJ |
300 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
301 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
498cdbfb OÇ |
302 | }, |
303 | }, | |
e56e57f6 DJ |
304 | { /* Handle problems with rebooting on Dell 300's */ |
305 | .callback = set_bios_reboot, | |
306 | .ident = "Dell PowerEdge 300", | |
05154752 | 307 | .matches = { |
e56e57f6 DJ |
308 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
309 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
05154752 GH |
310 | }, |
311 | }, | |
e56e57f6 DJ |
312 | { /* Handle problems with rebooting on Dell 1300's */ |
313 | .callback = set_bios_reboot, | |
314 | .ident = "Dell PowerEdge 1300", | |
0a832320 | 315 | .matches = { |
e56e57f6 DJ |
316 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
317 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
0a832320 JM |
318 | }, |
319 | }, | |
e56e57f6 DJ |
320 | { /* Handle problems with rebooting on Dell 2400's */ |
321 | .callback = set_bios_reboot, | |
322 | .ident = "Dell PowerEdge 2400", | |
3628c3f5 | 323 | .matches = { |
e56e57f6 DJ |
324 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
325 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
3628c3f5 MR |
326 | }, |
327 | }, | |
e56e57f6 | 328 | { /* Handle problems with rebooting on the Dell PowerEdge C6100. */ |
8412da75 | 329 | .callback = set_pci_reboot, |
e56e57f6 | 330 | .ident = "Dell PowerEdge C6100", |
8412da75 | 331 | .matches = { |
e56e57f6 DJ |
332 | DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
333 | DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), | |
8412da75 VS |
334 | }, |
335 | }, | |
e56e57f6 | 336 | { /* Handle problems with rebooting on the Precision M6600. */ |
b7798d28 | 337 | .callback = set_pci_reboot, |
e56e57f6 | 338 | .ident = "Dell Precision M6600", |
b7798d28 DB |
339 | .matches = { |
340 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 341 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), |
b7798d28 DB |
342 | }, |
343 | }, | |
e56e57f6 DJ |
344 | { /* Handle problems with rebooting on Dell T5400's */ |
345 | .callback = set_bios_reboot, | |
346 | .ident = "Dell Precision T5400", | |
a536877e PA |
347 | .matches = { |
348 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 349 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), |
a536877e PA |
350 | }, |
351 | }, | |
e56e57f6 DJ |
352 | { /* Handle problems with rebooting on Dell T7400's */ |
353 | .callback = set_bios_reboot, | |
354 | .ident = "Dell Precision T7400", | |
6be30bb7 RW |
355 | .matches = { |
356 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 357 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), |
6be30bb7 RW |
358 | }, |
359 | }, | |
e56e57f6 DJ |
360 | { /* Handle problems with rebooting on Dell XPS710 */ |
361 | .callback = set_bios_reboot, | |
362 | .ident = "Dell XPS710", | |
76eb9a30 ZR |
363 | .matches = { |
364 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 365 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), |
76eb9a30 ZR |
366 | }, |
367 | }, | |
e56e57f6 DJ |
368 | |
369 | /* Hewlett-Packard */ | |
370 | { /* Handle problems with rebooting on HP laptops */ | |
371 | .callback = set_bios_reboot, | |
372 | .ident = "HP Compaq Laptop", | |
4f0acd31 | 373 | .matches = { |
e56e57f6 DJ |
374 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
375 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), | |
4f0acd31 MS |
376 | }, |
377 | }, | |
e56e57f6 DJ |
378 | |
379 | /* Sony */ | |
380 | { /* Handle problems with rebooting on Sony VGN-Z540N */ | |
381 | .callback = set_bios_reboot, | |
382 | .ident = "Sony VGN-Z540N", | |
4f0acd31 | 383 | .matches = { |
e56e57f6 DJ |
384 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
385 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
4f0acd31 MS |
386 | }, |
387 | }, | |
e56e57f6 | 388 | |
6c6c51e4 PM |
389 | { } |
390 | }; | |
391 | ||
57b16594 | 392 | static int __init reboot_init(void) |
6c6c51e4 | 393 | { |
144d102b ML |
394 | /* |
395 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
396 | * on the command line |
397 | */ | |
144d102b | 398 | if (reboot_default) |
57b16594 | 399 | dmi_check_system(reboot_dmi_table); |
6c6c51e4 PM |
400 | return 0; |
401 | } | |
57b16594 | 402 | core_initcall(reboot_init); |
6c6c51e4 | 403 | |
4d022e35 MB |
404 | static inline void kb_wait(void) |
405 | { | |
406 | int i; | |
407 | ||
c84d6af8 AC |
408 | for (i = 0; i < 0x10000; i++) { |
409 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 410 | break; |
c84d6af8 AC |
411 | udelay(2); |
412 | } | |
4d022e35 MB |
413 | } |
414 | ||
9c48f1c6 | 415 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
416 | { |
417 | cpu_emergency_vmxoff(); | |
418 | } | |
419 | ||
144d102b | 420 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
421 | static void emergency_vmx_disable_all(void) |
422 | { | |
423 | /* Just make sure we won't change CPUs while doing this */ | |
424 | local_irq_disable(); | |
425 | ||
144d102b ML |
426 | /* |
427 | * We need to disable VMX on all CPUs before rebooting, otherwise | |
d176720d EH |
428 | * we risk hanging up the machine, because the CPU ignore INIT |
429 | * signals when VMX is enabled. | |
430 | * | |
431 | * We can't take any locks and we may be on an inconsistent | |
432 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
433 | * VMX and halt. | |
434 | * | |
435 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
436 | * stuff unnecessarily, but we don't have a way to check | |
437 | * if other CPUs have VMX enabled. So we will call it only if the | |
438 | * CPU we are running on has VMX enabled. | |
439 | * | |
440 | * We will miss cases where VMX is not enabled on all CPUs. This | |
441 | * shouldn't do much harm because KVM always enable VMX on all | |
442 | * CPUs anyway. But we can miss it on the small window where KVM | |
443 | * is still enabling VMX. | |
444 | */ | |
445 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
144d102b | 446 | /* Disable VMX on this CPU. */ |
d176720d EH |
447 | cpu_vmxoff(); |
448 | ||
449 | /* Halt and disable VMX on the other CPUs */ | |
450 | nmi_shootdown_cpus(vmxoff_nmi); | |
451 | ||
452 | } | |
453 | } | |
454 | ||
455 | ||
7432d149 IM |
456 | void __attribute__((weak)) mach_reboot_fixups(void) |
457 | { | |
458 | } | |
459 | ||
660e34ce | 460 | /* |
5be44a6f IM |
461 | * To the best of our knowledge Windows compatible x86 hardware expects |
462 | * the following on reboot: | |
660e34ce MG |
463 | * |
464 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
465 | * 2) If still alive, write to the keyboard controller | |
466 | * 3) If still alive, write to the ACPI reboot register again | |
467 | * 4) If still alive, write to the keyboard controller again | |
a4f1987e | 468 | * 5) If still alive, call the EFI runtime service to reboot |
5be44a6f | 469 | * 6) If no EFI runtime service, call the BIOS to do a reboot |
660e34ce | 470 | * |
5be44a6f IM |
471 | * We default to following the same pattern. We also have |
472 | * two other reboot methods: 'triple fault' and 'PCI', which | |
473 | * can be triggered via the reboot= kernel boot option or | |
474 | * via quirks. | |
475 | * | |
476 | * This means that this function can never return, it can misbehave | |
477 | * by not rebooting properly and hanging. | |
660e34ce | 478 | */ |
416e2d63 | 479 | static void native_machine_emergency_restart(void) |
1da177e4 | 480 | { |
4d022e35 | 481 | int i; |
660e34ce MG |
482 | int attempt = 0; |
483 | int orig_reboot_type = reboot_type; | |
edf2b139 | 484 | unsigned short mode; |
4d022e35 | 485 | |
d176720d EH |
486 | if (reboot_emergency) |
487 | emergency_vmx_disable_all(); | |
488 | ||
840c2baf JC |
489 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
490 | ||
4d022e35 | 491 | /* Tell the BIOS if we want cold or warm reboot */ |
edf2b139 RH |
492 | mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
493 | *((unsigned short *)__va(0x472)) = mode; | |
4d022e35 MB |
494 | |
495 | for (;;) { | |
496 | /* Could also try the reset bit in the Hammer NB */ | |
497 | switch (reboot_type) { | |
5be44a6f IM |
498 | case BOOT_ACPI: |
499 | acpi_reboot(); | |
500 | reboot_type = BOOT_KBD; | |
501 | break; | |
502 | ||
4d022e35 | 503 | case BOOT_KBD: |
144d102b | 504 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 505 | |
4d022e35 MB |
506 | for (i = 0; i < 10; i++) { |
507 | kb_wait(); | |
508 | udelay(50); | |
144d102b | 509 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
510 | udelay(50); |
511 | } | |
660e34ce MG |
512 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
513 | attempt = 1; | |
514 | reboot_type = BOOT_ACPI; | |
515 | } else { | |
a4f1987e | 516 | reboot_type = BOOT_EFI; |
660e34ce MG |
517 | } |
518 | break; | |
4d022e35 | 519 | |
4d022e35 | 520 | case BOOT_EFI: |
83e68189 | 521 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
edf2b139 | 522 | efi.reset_system(reboot_mode == REBOOT_WARM ? |
14d7ca5c PA |
523 | EFI_RESET_WARM : |
524 | EFI_RESET_COLD, | |
4d022e35 | 525 | EFI_SUCCESS, 0, NULL); |
5be44a6f IM |
526 | reboot_type = BOOT_BIOS; |
527 | break; | |
528 | ||
529 | case BOOT_BIOS: | |
530 | machine_real_restart(MRR_BIOS); | |
531 | ||
532 | /* We're probably dead after this, but... */ | |
533 | reboot_type = BOOT_CF9_SAFE; | |
14d7ca5c | 534 | break; |
4d022e35 | 535 | |
5be44a6f | 536 | case BOOT_CF9_FORCE: |
14d7ca5c | 537 | port_cf9_safe = true; |
144d102b | 538 | /* Fall through */ |
4d022e35 | 539 | |
5be44a6f | 540 | case BOOT_CF9_SAFE: |
14d7ca5c | 541 | if (port_cf9_safe) { |
5be44a6f | 542 | u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E; |
16c21ae5 | 543 | u8 cf9 = inb(0xcf9) & ~reboot_code; |
14d7ca5c PA |
544 | outb(cf9|2, 0xcf9); /* Request hard reset */ |
545 | udelay(50); | |
16c21ae5 LF |
546 | /* Actually do the reset */ |
547 | outb(cf9|reboot_code, 0xcf9); | |
14d7ca5c PA |
548 | udelay(50); |
549 | } | |
5be44a6f IM |
550 | reboot_type = BOOT_TRIPLE; |
551 | break; | |
552 | ||
553 | case BOOT_TRIPLE: | |
554 | load_idt(&no_idt); | |
555 | __asm__ __volatile__("int3"); | |
556 | ||
557 | /* We're probably dead after this, but... */ | |
558 | reboot_type = BOOT_KBD; | |
4d022e35 MB |
559 | break; |
560 | } | |
561 | } | |
562 | } | |
563 | ||
3c62c625 | 564 | void native_machine_shutdown(void) |
4d022e35 MB |
565 | { |
566 | /* Stop the cpus and apics */ | |
522e6646 | 567 | #ifdef CONFIG_X86_IO_APIC |
2885432a FY |
568 | /* |
569 | * Disabling IO APIC before local APIC is a workaround for | |
570 | * erratum AVR31 in "Intel Atom Processor C2000 Product Family | |
571 | * Specification Update". In this situation, interrupts that target | |
572 | * a Logical Processor whose Local APIC is either in the process of | |
573 | * being hardware disabled or software disabled are neither delivered | |
574 | * nor discarded. When this erratum occurs, the processor may hang. | |
575 | * | |
576 | * Even without the erratum, it still makes sense to quiet IO APIC | |
577 | * before disabling Local APIC. | |
578 | */ | |
522e6646 FY |
579 | disable_IO_APIC(); |
580 | #endif | |
581 | ||
1da177e4 | 582 | #ifdef CONFIG_SMP |
144d102b | 583 | /* |
1b3a5d02 RH |
584 | * Stop all of the others. Also disable the local irq to |
585 | * not receive the per-cpu timer interrupt which may trigger | |
586 | * scheduler's load balance. | |
1da177e4 | 587 | */ |
55c844a4 | 588 | local_irq_disable(); |
76fac077 | 589 | stop_other_cpus(); |
4d022e35 | 590 | #endif |
1da177e4 LT |
591 | |
592 | lapic_shutdown(); | |
593 | ||
c86c7fbc OH |
594 | #ifdef CONFIG_HPET_TIMER |
595 | hpet_disable(); | |
596 | #endif | |
dd2a1305 | 597 | |
4d022e35 | 598 | #ifdef CONFIG_X86_64 |
338bac52 | 599 | x86_platform.iommu_shutdown(); |
4d022e35 | 600 | #endif |
973efae2 JF |
601 | } |
602 | ||
d176720d EH |
603 | static void __machine_emergency_restart(int emergency) |
604 | { | |
605 | reboot_emergency = emergency; | |
606 | machine_ops.emergency_restart(); | |
607 | } | |
608 | ||
416e2d63 | 609 | static void native_machine_restart(char *__unused) |
dd2a1305 | 610 | { |
c767a54b | 611 | pr_notice("machine restart\n"); |
1da177e4 | 612 | |
4d022e35 MB |
613 | if (!reboot_force) |
614 | machine_shutdown(); | |
d176720d | 615 | __machine_emergency_restart(0); |
4a1421f8 EB |
616 | } |
617 | ||
416e2d63 | 618 | static void native_machine_halt(void) |
1da177e4 | 619 | { |
144d102b | 620 | /* Stop other cpus and apics */ |
d3ec5cae IV |
621 | machine_shutdown(); |
622 | ||
840c2baf JC |
623 | tboot_shutdown(TB_SHUTDOWN_HALT); |
624 | ||
d3ec5cae | 625 | stop_this_cpu(NULL); |
1da177e4 LT |
626 | } |
627 | ||
416e2d63 | 628 | static void native_machine_power_off(void) |
1da177e4 | 629 | { |
6e3fbee5 | 630 | if (pm_power_off) { |
4d022e35 MB |
631 | if (!reboot_force) |
632 | machine_shutdown(); | |
1da177e4 | 633 | pm_power_off(); |
6e3fbee5 | 634 | } |
144d102b | 635 | /* A fallback in case there is no PM info available */ |
840c2baf | 636 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
637 | } |
638 | ||
07f3331c | 639 | struct machine_ops machine_ops = { |
416e2d63 JB |
640 | .power_off = native_machine_power_off, |
641 | .shutdown = native_machine_shutdown, | |
642 | .emergency_restart = native_machine_emergency_restart, | |
643 | .restart = native_machine_restart, | |
ed23dc6f GC |
644 | .halt = native_machine_halt, |
645 | #ifdef CONFIG_KEXEC | |
646 | .crash_shutdown = native_machine_crash_shutdown, | |
647 | #endif | |
07f3331c | 648 | }; |
416e2d63 JB |
649 | |
650 | void machine_power_off(void) | |
651 | { | |
652 | machine_ops.power_off(); | |
653 | } | |
654 | ||
655 | void machine_shutdown(void) | |
656 | { | |
657 | machine_ops.shutdown(); | |
658 | } | |
659 | ||
660 | void machine_emergency_restart(void) | |
661 | { | |
d176720d | 662 | __machine_emergency_restart(1); |
416e2d63 JB |
663 | } |
664 | ||
665 | void machine_restart(char *cmd) | |
666 | { | |
667 | machine_ops.restart(cmd); | |
668 | } | |
669 | ||
670 | void machine_halt(void) | |
671 | { | |
672 | machine_ops.halt(); | |
673 | } | |
674 | ||
ed23dc6f GC |
675 | #ifdef CONFIG_KEXEC |
676 | void machine_crash_shutdown(struct pt_regs *regs) | |
677 | { | |
678 | machine_ops.crash_shutdown(regs); | |
679 | } | |
680 | #endif | |
2ddded21 EH |
681 | |
682 | ||
bb8dd270 | 683 | #if defined(CONFIG_SMP) |
2ddded21 EH |
684 | |
685 | /* This keeps a track of which one is crashing cpu. */ | |
686 | static int crashing_cpu; | |
687 | static nmi_shootdown_cb shootdown_callback; | |
688 | ||
689 | static atomic_t waiting_for_crash_ipi; | |
690 | ||
9c48f1c6 | 691 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
692 | { |
693 | int cpu; | |
694 | ||
2ddded21 EH |
695 | cpu = raw_smp_processor_id(); |
696 | ||
144d102b ML |
697 | /* |
698 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
699 | * Otherwise, system will completely hang. Crashing cpu can get |
700 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
701 | */ | |
702 | if (cpu == crashing_cpu) | |
9c48f1c6 | 703 | return NMI_HANDLED; |
2ddded21 EH |
704 | local_irq_disable(); |
705 | ||
9c48f1c6 | 706 | shootdown_callback(cpu, regs); |
2ddded21 EH |
707 | |
708 | atomic_dec(&waiting_for_crash_ipi); | |
709 | /* Assume hlt works */ | |
710 | halt(); | |
711 | for (;;) | |
712 | cpu_relax(); | |
713 | ||
9c48f1c6 | 714 | return NMI_HANDLED; |
2ddded21 EH |
715 | } |
716 | ||
717 | static void smp_send_nmi_allbutself(void) | |
718 | { | |
dac5f412 | 719 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
720 | } |
721 | ||
144d102b ML |
722 | /* |
723 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
724 | * |
725 | * This function can be used to halt all other CPUs on crash | |
726 | * or emergency reboot time. The function passed as parameter | |
727 | * will be called inside a NMI handler on all CPUs. | |
728 | */ | |
2ddded21 EH |
729 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
730 | { | |
731 | unsigned long msecs; | |
c415b3dc | 732 | local_irq_disable(); |
2ddded21 | 733 | |
144d102b | 734 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
735 | crashing_cpu = safe_smp_processor_id(); |
736 | ||
737 | shootdown_callback = callback; | |
738 | ||
739 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
740 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
741 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
742 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
743 | return; /* Return what? */ |
744 | /* | |
745 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
746 | * out the NMI |
747 | */ | |
748 | wmb(); | |
749 | ||
750 | smp_send_nmi_allbutself(); | |
751 | ||
752 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
753 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
754 | mdelay(1); | |
755 | msecs--; | |
756 | } | |
757 | ||
758 | /* Leave the nmi callback set */ | |
759 | } | |
bb8dd270 EH |
760 | #else /* !CONFIG_SMP */ |
761 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
762 | { | |
763 | /* No other CPUs to shoot down */ | |
764 | } | |
2ddded21 | 765 | #endif |