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Commit | Line | Data |
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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 = {}; |
edf2b139 | 39 | static enum reboot_mode reboot_mode; |
660e34ce | 40 | enum reboot_type reboot_type = BOOT_ACPI; |
4d022e35 | 41 | int reboot_force; |
1da177e4 | 42 | |
144d102b ML |
43 | /* |
44 | * This variable is used privately to keep track of whether or not | |
5955633e ML |
45 | * reboot_type is still set to its default value (i.e., reboot= hasn't |
46 | * been set on the command line). This is needed so that we can | |
47 | * suppress DMI scanning for reboot quirks. Without it, it's | |
48 | * impossible to override a faulty reboot quirk without recompiling. | |
49 | */ | |
50 | static int reboot_default = 1; | |
51 | ||
65051397 | 52 | #ifdef CONFIG_SMP |
1da177e4 | 53 | static int reboot_cpu = -1; |
1da177e4 | 54 | #endif |
4d022e35 | 55 | |
144d102b ML |
56 | /* |
57 | * This is set if we need to go through the 'emergency' path. | |
d176720d EH |
58 | * When machine_emergency_restart() is called, we may be on |
59 | * an inconsistent state and won't be able to do a clean cleanup | |
60 | */ | |
61 | static int reboot_emergency; | |
62 | ||
14d7ca5c PA |
63 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
64 | bool port_cf9_safe = false; | |
65 | ||
144d102b ML |
66 | /* |
67 | * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] | |
68 | * warm Don't set the cold reboot flag | |
69 | * cold Set the cold reboot flag | |
65051397 PA |
70 | * bios Reboot by jumping through the BIOS |
71 | * smp Reboot by executing reset on BSP or other CPU | |
144d102b ML |
72 | * triple Force a triple fault (init) |
73 | * kbd Use the keyboard controller. cold reset (default) | |
74 | * acpi Use the RESET_REG in the FADT | |
75 | * efi Use efi reset_system runtime service | |
76 | * pci Use the so-called "PCI reset register", CF9 | |
77 | * force Avoid anything that could hang. | |
4d022e35 | 78 | */ |
1da177e4 LT |
79 | static int __init reboot_setup(char *str) |
80 | { | |
4d022e35 | 81 | for (;;) { |
144d102b ML |
82 | /* |
83 | * Having anything passed on the command line via | |
5955633e ML |
84 | * reboot= will cause us to disable DMI checking |
85 | * below. | |
86 | */ | |
87 | reboot_default = 0; | |
88 | ||
1da177e4 | 89 | switch (*str) { |
4d022e35 | 90 | case 'w': |
edf2b139 | 91 | reboot_mode = REBOOT_WARM; |
1da177e4 | 92 | break; |
4d022e35 MB |
93 | |
94 | case 'c': | |
edf2b139 | 95 | reboot_mode = REBOOT_COLD; |
1da177e4 | 96 | break; |
4d022e35 | 97 | |
1da177e4 | 98 | #ifdef CONFIG_SMP |
4d022e35 | 99 | case 's': |
6f673d83 | 100 | if (isdigit(*(str+1))) { |
1da177e4 | 101 | reboot_cpu = (int) (*(str+1) - '0'); |
6f673d83 | 102 | if (isdigit(*(str+2))) |
1da177e4 LT |
103 | reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
104 | } | |
144d102b ML |
105 | /* |
106 | * We will leave sorting out the final value | |
107 | * when we are ready to reboot, since we might not | |
108 | * have detected BSP APIC ID or smp_num_cpu | |
109 | */ | |
1da177e4 | 110 | break; |
4d022e35 MB |
111 | #endif /* CONFIG_SMP */ |
112 | ||
113 | case 'b': | |
4d022e35 MB |
114 | case 'a': |
115 | case 'k': | |
116 | case 't': | |
117 | case 'e': | |
14d7ca5c | 118 | case 'p': |
4d022e35 MB |
119 | reboot_type = *str; |
120 | break; | |
121 | ||
122 | case 'f': | |
123 | reboot_force = 1; | |
124 | break; | |
1da177e4 | 125 | } |
4d022e35 MB |
126 | |
127 | str = strchr(str, ','); | |
128 | if (str) | |
1da177e4 LT |
129 | str++; |
130 | else | |
131 | break; | |
132 | } | |
133 | return 1; | |
134 | } | |
135 | ||
136 | __setup("reboot=", reboot_setup); | |
137 | ||
4d022e35 | 138 | |
1da177e4 LT |
139 | /* |
140 | * Reboot options and system auto-detection code provided by | |
141 | * Dell Inc. so their systems "just work". :-) | |
142 | */ | |
143 | ||
144 | /* | |
1ef03890 | 145 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 146 | * this quirk makes that automatic. |
1da177e4 | 147 | */ |
1855256c | 148 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 149 | { |
4d022e35 MB |
150 | if (reboot_type != BOOT_BIOS) { |
151 | reboot_type = BOOT_BIOS; | |
c767a54b JP |
152 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
153 | "BIOS", d->ident); | |
1da177e4 LT |
154 | } |
155 | return 0; | |
156 | } | |
157 | ||
65051397 | 158 | void __noreturn machine_real_restart(unsigned int type) |
57b16594 | 159 | { |
57b16594 ML |
160 | local_irq_disable(); |
161 | ||
144d102b ML |
162 | /* |
163 | * Write zero to CMOS register number 0x0f, which the BIOS POST | |
164 | * routine will recognize as telling it to do a proper reboot. (Well | |
165 | * that's what this book in front of me says -- it may only apply to | |
166 | * the Phoenix BIOS though, it's not clear). At the same time, | |
167 | * disable NMIs by setting the top bit in the CMOS address register, | |
168 | * as we're about to do peculiar things to the CPU. I'm not sure if | |
169 | * `outb_p' is needed instead of just `outb'. Use it to be on the | |
170 | * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
57b16594 ML |
171 | */ |
172 | spin_lock(&rtc_lock); | |
173 | CMOS_WRITE(0x00, 0x8f); | |
174 | spin_unlock(&rtc_lock); | |
175 | ||
176 | /* | |
177 | * Switch back to the initial page table. | |
178 | */ | |
65051397 | 179 | #ifdef CONFIG_X86_32 |
57b16594 | 180 | load_cr3(initial_page_table); |
65051397 PA |
181 | #else |
182 | write_cr3(real_mode_header->trampoline_pgd); | |
183 | #endif | |
57b16594 | 184 | |
57b16594 | 185 | /* Jump to the identity-mapped low memory code */ |
65051397 PA |
186 | #ifdef CONFIG_X86_32 |
187 | asm volatile("jmpl *%0" : : | |
188 | "rm" (real_mode_header->machine_real_restart_asm), | |
189 | "a" (type)); | |
190 | #else | |
191 | asm volatile("ljmpl *%0" : : | |
192 | "m" (real_mode_header->machine_real_restart_asm), | |
193 | "D" (type)); | |
194 | #endif | |
195 | unreachable(); | |
57b16594 ML |
196 | } |
197 | #ifdef CONFIG_APM_MODULE | |
198 | EXPORT_SYMBOL(machine_real_restart); | |
199 | #endif | |
200 | ||
57b16594 ML |
201 | /* |
202 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot | |
203 | */ | |
204 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
205 | { | |
206 | if (reboot_type != BOOT_CF9) { | |
207 | reboot_type = BOOT_CF9; | |
c767a54b JP |
208 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
209 | "PCI", d->ident); | |
57b16594 ML |
210 | } |
211 | return 0; | |
212 | } | |
213 | ||
1ef03890 PC |
214 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
215 | { | |
216 | if (reboot_type != BOOT_KBD) { | |
217 | reboot_type = BOOT_KBD; | |
c767a54b JP |
218 | pr_info("%s series board detected. Selecting %s-method for reboot.\n", |
219 | "KBD", d->ident); | |
1ef03890 PC |
220 | } |
221 | return 0; | |
222 | } | |
223 | ||
144d102b | 224 | /* |
65051397 | 225 | * This is a single dmi_table handling all reboot quirks. |
57b16594 | 226 | */ |
1da177e4 | 227 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
b9e82af8 TG |
228 | { /* Handle problems with rebooting on Dell E520's */ |
229 | .callback = set_bios_reboot, | |
230 | .ident = "Dell E520", | |
231 | .matches = { | |
232 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
233 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), | |
234 | }, | |
235 | }, | |
1da177e4 | 236 | { /* Handle problems with rebooting on Dell 1300's */ |
dd2a1305 | 237 | .callback = set_bios_reboot, |
1da177e4 LT |
238 | .ident = "Dell PowerEdge 1300", |
239 | .matches = { | |
240 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
241 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
242 | }, | |
243 | }, | |
244 | { /* Handle problems with rebooting on Dell 300's */ | |
245 | .callback = set_bios_reboot, | |
246 | .ident = "Dell PowerEdge 300", | |
247 | .matches = { | |
248 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
249 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
250 | }, | |
251 | }, | |
144d102b | 252 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
df2edcf3 JJ |
253 | .callback = set_bios_reboot, |
254 | .ident = "Dell OptiPlex 745", | |
255 | .matches = { | |
256 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
257 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
df2edcf3 JJ |
258 | }, |
259 | }, | |
144d102b | 260 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
fc115bf1 CK |
261 | .callback = set_bios_reboot, |
262 | .ident = "Dell OptiPlex 745", | |
263 | .matches = { | |
264 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
265 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
266 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
267 | }, | |
268 | }, | |
144d102b | 269 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
fc1c8925 HAA |
270 | .callback = set_bios_reboot, |
271 | .ident = "Dell OptiPlex 745", | |
272 | .matches = { | |
273 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
274 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
275 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
276 | }, | |
277 | }, | |
144d102b | 278 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
093bac15 SC |
279 | .callback = set_bios_reboot, |
280 | .ident = "Dell OptiPlex 330", | |
281 | .matches = { | |
282 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
283 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), | |
284 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
285 | }, | |
286 | }, | |
144d102b | 287 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
4a4aca64 JD |
288 | .callback = set_bios_reboot, |
289 | .ident = "Dell OptiPlex 360", | |
290 | .matches = { | |
291 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
292 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), | |
293 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
294 | }, | |
295 | }, | |
144d102b | 296 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
35ea63d7 LO |
297 | .callback = set_bios_reboot, |
298 | .ident = "Dell OptiPlex 760", | |
299 | .matches = { | |
300 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
301 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
302 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
303 | }, | |
304 | }, | |
1da177e4 LT |
305 | { /* Handle problems with rebooting on Dell 2400's */ |
306 | .callback = set_bios_reboot, | |
307 | .ident = "Dell PowerEdge 2400", | |
308 | .matches = { | |
309 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
310 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
311 | }, | |
312 | }, | |
fab3b58d IM |
313 | { /* Handle problems with rebooting on Dell T5400's */ |
314 | .callback = set_bios_reboot, | |
315 | .ident = "Dell Precision T5400", | |
316 | .matches = { | |
317 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
318 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), | |
319 | }, | |
320 | }, | |
890ffedc TB |
321 | { /* Handle problems with rebooting on Dell T7400's */ |
322 | .callback = set_bios_reboot, | |
323 | .ident = "Dell Precision T7400", | |
324 | .matches = { | |
325 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
326 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), | |
327 | }, | |
328 | }, | |
766c3f94 | 329 | { /* Handle problems with rebooting on HP laptops */ |
d91b14c4 | 330 | .callback = set_bios_reboot, |
766c3f94 | 331 | .ident = "HP Compaq Laptop", |
d91b14c4 TV |
332 | .matches = { |
333 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
766c3f94 | 334 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
d91b14c4 TV |
335 | }, |
336 | }, | |
dd4124a8 LO |
337 | { /* Handle problems with rebooting on Dell XPS710 */ |
338 | .callback = set_bios_reboot, | |
339 | .ident = "Dell XPS710", | |
340 | .matches = { | |
341 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
342 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), | |
343 | }, | |
344 | }, | |
c5da9a2b AC |
345 | { /* Handle problems with rebooting on Dell DXP061 */ |
346 | .callback = set_bios_reboot, | |
347 | .ident = "Dell DXP061", | |
348 | .matches = { | |
349 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
350 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), | |
351 | }, | |
352 | }, | |
88dff493 ZR |
353 | { /* Handle problems with rebooting on Sony VGN-Z540N */ |
354 | .callback = set_bios_reboot, | |
355 | .ident = "Sony VGN-Z540N", | |
356 | .matches = { | |
357 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
358 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
359 | }, | |
360 | }, | |
144d102b | 361 | { /* Handle problems with rebooting on ASUS P4S800 */ |
4832ddda LO |
362 | .callback = set_bios_reboot, |
363 | .ident = "ASUS P4S800", | |
364 | .matches = { | |
365 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
366 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
367 | }, | |
368 | }, | |
57b16594 | 369 | |
144d102b | 370 | { /* Handle reboot issue on Acer Aspire one */ |
1ef03890 | 371 | .callback = set_kbd_reboot, |
b49c78d4 PC |
372 | .ident = "Acer Aspire One A110", |
373 | .matches = { | |
374 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
375 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
376 | }, | |
377 | }, | |
3e03bbea | 378 | { /* Handle problems with rebooting on Apple MacBook5 */ |
6c6c51e4 | 379 | .callback = set_pci_reboot, |
3e03bbea | 380 | .ident = "Apple MacBook5", |
6c6c51e4 PM |
381 | .matches = { |
382 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 383 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), |
6c6c51e4 PM |
384 | }, |
385 | }, | |
3e03bbea | 386 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
498cdbfb | 387 | .callback = set_pci_reboot, |
3e03bbea | 388 | .ident = "Apple MacBookPro5", |
498cdbfb OÇ |
389 | .matches = { |
390 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 391 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), |
498cdbfb OÇ |
392 | }, |
393 | }, | |
05154752 GH |
394 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
395 | .callback = set_pci_reboot, | |
396 | .ident = "Apple Macmini3,1", | |
397 | .matches = { | |
398 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
399 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
400 | }, | |
401 | }, | |
0a832320 JM |
402 | { /* Handle problems with rebooting on the iMac9,1. */ |
403 | .callback = set_pci_reboot, | |
404 | .ident = "Apple iMac9,1", | |
405 | .matches = { | |
406 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
407 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
408 | }, | |
409 | }, | |
3628c3f5 MR |
410 | { /* Handle problems with rebooting on the Latitude E6320. */ |
411 | .callback = set_pci_reboot, | |
412 | .ident = "Dell Latitude E6320", | |
413 | .matches = { | |
414 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
415 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), | |
416 | }, | |
417 | }, | |
b7798d28 DB |
418 | { /* Handle problems with rebooting on the Latitude E5420. */ |
419 | .callback = set_pci_reboot, | |
420 | .ident = "Dell Latitude E5420", | |
421 | .matches = { | |
422 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
423 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), | |
424 | }, | |
425 | }, | |
a536877e PA |
426 | { /* Handle problems with rebooting on the Latitude E6420. */ |
427 | .callback = set_pci_reboot, | |
428 | .ident = "Dell Latitude E6420", | |
429 | .matches = { | |
430 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
431 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), | |
432 | }, | |
433 | }, | |
6be30bb7 RW |
434 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
435 | .callback = set_pci_reboot, | |
436 | .ident = "Dell OptiPlex 990", | |
437 | .matches = { | |
438 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
439 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
440 | }, | |
441 | }, | |
76eb9a30 ZR |
442 | { /* Handle problems with rebooting on the Precision M6600. */ |
443 | .callback = set_pci_reboot, | |
444 | .ident = "Dell OptiPlex 990", | |
445 | .matches = { | |
446 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
447 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), | |
448 | }, | |
449 | }, | |
6c6c51e4 PM |
450 | { } |
451 | }; | |
452 | ||
57b16594 | 453 | static int __init reboot_init(void) |
6c6c51e4 | 454 | { |
144d102b ML |
455 | /* |
456 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
457 | * on the command line |
458 | */ | |
144d102b | 459 | if (reboot_default) |
57b16594 | 460 | dmi_check_system(reboot_dmi_table); |
6c6c51e4 PM |
461 | return 0; |
462 | } | |
57b16594 | 463 | core_initcall(reboot_init); |
6c6c51e4 | 464 | |
4d022e35 MB |
465 | static inline void kb_wait(void) |
466 | { | |
467 | int i; | |
468 | ||
c84d6af8 AC |
469 | for (i = 0; i < 0x10000; i++) { |
470 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 471 | break; |
c84d6af8 AC |
472 | udelay(2); |
473 | } | |
4d022e35 MB |
474 | } |
475 | ||
9c48f1c6 | 476 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
477 | { |
478 | cpu_emergency_vmxoff(); | |
479 | } | |
480 | ||
144d102b | 481 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
482 | static void emergency_vmx_disable_all(void) |
483 | { | |
484 | /* Just make sure we won't change CPUs while doing this */ | |
485 | local_irq_disable(); | |
486 | ||
144d102b ML |
487 | /* |
488 | * We need to disable VMX on all CPUs before rebooting, otherwise | |
d176720d EH |
489 | * we risk hanging up the machine, because the CPU ignore INIT |
490 | * signals when VMX is enabled. | |
491 | * | |
492 | * We can't take any locks and we may be on an inconsistent | |
493 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
494 | * VMX and halt. | |
495 | * | |
496 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
497 | * stuff unnecessarily, but we don't have a way to check | |
498 | * if other CPUs have VMX enabled. So we will call it only if the | |
499 | * CPU we are running on has VMX enabled. | |
500 | * | |
501 | * We will miss cases where VMX is not enabled on all CPUs. This | |
502 | * shouldn't do much harm because KVM always enable VMX on all | |
503 | * CPUs anyway. But we can miss it on the small window where KVM | |
504 | * is still enabling VMX. | |
505 | */ | |
506 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
144d102b | 507 | /* Disable VMX on this CPU. */ |
d176720d EH |
508 | cpu_vmxoff(); |
509 | ||
510 | /* Halt and disable VMX on the other CPUs */ | |
511 | nmi_shootdown_cpus(vmxoff_nmi); | |
512 | ||
513 | } | |
514 | } | |
515 | ||
516 | ||
7432d149 IM |
517 | void __attribute__((weak)) mach_reboot_fixups(void) |
518 | { | |
519 | } | |
520 | ||
660e34ce MG |
521 | /* |
522 | * Windows compatible x86 hardware expects the following on reboot: | |
523 | * | |
524 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
525 | * 2) If still alive, write to the keyboard controller | |
526 | * 3) If still alive, write to the ACPI reboot register again | |
527 | * 4) If still alive, write to the keyboard controller again | |
528 | * | |
529 | * If the machine is still alive at this stage, it gives up. We default to | |
530 | * following the same pattern, except that if we're still alive after (4) we'll | |
531 | * try to force a triple fault and then cycle between hitting the keyboard | |
532 | * controller and doing that | |
533 | */ | |
416e2d63 | 534 | static void native_machine_emergency_restart(void) |
1da177e4 | 535 | { |
4d022e35 | 536 | int i; |
660e34ce MG |
537 | int attempt = 0; |
538 | int orig_reboot_type = reboot_type; | |
edf2b139 | 539 | unsigned short mode; |
4d022e35 | 540 | |
d176720d EH |
541 | if (reboot_emergency) |
542 | emergency_vmx_disable_all(); | |
543 | ||
840c2baf JC |
544 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
545 | ||
4d022e35 | 546 | /* Tell the BIOS if we want cold or warm reboot */ |
edf2b139 RH |
547 | mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
548 | *((unsigned short *)__va(0x472)) = mode; | |
4d022e35 MB |
549 | |
550 | for (;;) { | |
551 | /* Could also try the reset bit in the Hammer NB */ | |
552 | switch (reboot_type) { | |
553 | case BOOT_KBD: | |
144d102b | 554 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 555 | |
4d022e35 MB |
556 | for (i = 0; i < 10; i++) { |
557 | kb_wait(); | |
558 | udelay(50); | |
144d102b | 559 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
560 | udelay(50); |
561 | } | |
660e34ce MG |
562 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
563 | attempt = 1; | |
564 | reboot_type = BOOT_ACPI; | |
565 | } else { | |
566 | reboot_type = BOOT_TRIPLE; | |
567 | } | |
568 | break; | |
4d022e35 MB |
569 | |
570 | case BOOT_TRIPLE: | |
ebdd561a | 571 | load_idt(&no_idt); |
4d022e35 MB |
572 | __asm__ __volatile__("int3"); |
573 | ||
574 | reboot_type = BOOT_KBD; | |
575 | break; | |
576 | ||
4d022e35 | 577 | case BOOT_BIOS: |
3d35ac34 | 578 | machine_real_restart(MRR_BIOS); |
4d022e35 MB |
579 | |
580 | reboot_type = BOOT_KBD; | |
581 | break; | |
4d022e35 MB |
582 | |
583 | case BOOT_ACPI: | |
584 | acpi_reboot(); | |
585 | reboot_type = BOOT_KBD; | |
586 | break; | |
587 | ||
4d022e35 | 588 | case BOOT_EFI: |
83e68189 | 589 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
edf2b139 | 590 | efi.reset_system(reboot_mode == REBOOT_WARM ? |
14d7ca5c PA |
591 | EFI_RESET_WARM : |
592 | EFI_RESET_COLD, | |
4d022e35 | 593 | EFI_SUCCESS, 0, NULL); |
b47b9288 | 594 | reboot_type = BOOT_KBD; |
14d7ca5c | 595 | break; |
4d022e35 | 596 | |
14d7ca5c PA |
597 | case BOOT_CF9: |
598 | port_cf9_safe = true; | |
144d102b | 599 | /* Fall through */ |
4d022e35 | 600 | |
14d7ca5c PA |
601 | case BOOT_CF9_COND: |
602 | if (port_cf9_safe) { | |
603 | u8 cf9 = inb(0xcf9) & ~6; | |
604 | outb(cf9|2, 0xcf9); /* Request hard reset */ | |
605 | udelay(50); | |
606 | outb(cf9|6, 0xcf9); /* Actually do the reset */ | |
607 | udelay(50); | |
608 | } | |
4d022e35 MB |
609 | reboot_type = BOOT_KBD; |
610 | break; | |
611 | } | |
612 | } | |
613 | } | |
614 | ||
3c62c625 | 615 | void native_machine_shutdown(void) |
4d022e35 MB |
616 | { |
617 | /* Stop the cpus and apics */ | |
1da177e4 | 618 | #ifdef CONFIG_SMP |
dd2a1305 EB |
619 | |
620 | /* The boot cpu is always logical cpu 0 */ | |
65c01184 | 621 | int reboot_cpu_id = 0; |
dd2a1305 EB |
622 | |
623 | /* See if there has been given a command line override */ | |
9628937d | 624 | if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) && |
0bc3cc03 | 625 | cpu_online(reboot_cpu)) |
dd2a1305 | 626 | reboot_cpu_id = reboot_cpu; |
1da177e4 | 627 | |
4d022e35 | 628 | /* Make certain the cpu I'm about to reboot on is online */ |
0bc3cc03 | 629 | if (!cpu_online(reboot_cpu_id)) |
dd2a1305 | 630 | reboot_cpu_id = smp_processor_id(); |
dd2a1305 EB |
631 | |
632 | /* Make certain I only run on the appropriate processor */ | |
9628937d | 633 | set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); |
dd2a1305 | 634 | |
144d102b | 635 | /* |
55c844a4 FT |
636 | * O.K Now that I'm on the appropriate processor, stop all of the |
637 | * others. Also disable the local irq to not receive the per-cpu | |
638 | * timer interrupt which may trigger scheduler's load balance. | |
1da177e4 | 639 | */ |
55c844a4 | 640 | local_irq_disable(); |
76fac077 | 641 | stop_other_cpus(); |
4d022e35 | 642 | #endif |
1da177e4 LT |
643 | |
644 | lapic_shutdown(); | |
645 | ||
646 | #ifdef CONFIG_X86_IO_APIC | |
647 | disable_IO_APIC(); | |
648 | #endif | |
4d022e35 | 649 | |
c86c7fbc OH |
650 | #ifdef CONFIG_HPET_TIMER |
651 | hpet_disable(); | |
652 | #endif | |
dd2a1305 | 653 | |
4d022e35 | 654 | #ifdef CONFIG_X86_64 |
338bac52 | 655 | x86_platform.iommu_shutdown(); |
4d022e35 | 656 | #endif |
973efae2 JF |
657 | } |
658 | ||
d176720d EH |
659 | static void __machine_emergency_restart(int emergency) |
660 | { | |
661 | reboot_emergency = emergency; | |
662 | machine_ops.emergency_restart(); | |
663 | } | |
664 | ||
416e2d63 | 665 | static void native_machine_restart(char *__unused) |
dd2a1305 | 666 | { |
c767a54b | 667 | pr_notice("machine restart\n"); |
1da177e4 | 668 | |
4d022e35 MB |
669 | if (!reboot_force) |
670 | machine_shutdown(); | |
d176720d | 671 | __machine_emergency_restart(0); |
4a1421f8 EB |
672 | } |
673 | ||
416e2d63 | 674 | static void native_machine_halt(void) |
1da177e4 | 675 | { |
144d102b | 676 | /* Stop other cpus and apics */ |
d3ec5cae IV |
677 | machine_shutdown(); |
678 | ||
840c2baf JC |
679 | tboot_shutdown(TB_SHUTDOWN_HALT); |
680 | ||
d3ec5cae | 681 | stop_this_cpu(NULL); |
1da177e4 LT |
682 | } |
683 | ||
416e2d63 | 684 | static void native_machine_power_off(void) |
1da177e4 | 685 | { |
6e3fbee5 | 686 | if (pm_power_off) { |
4d022e35 MB |
687 | if (!reboot_force) |
688 | machine_shutdown(); | |
1da177e4 | 689 | pm_power_off(); |
6e3fbee5 | 690 | } |
144d102b | 691 | /* A fallback in case there is no PM info available */ |
840c2baf | 692 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
693 | } |
694 | ||
07f3331c | 695 | struct machine_ops machine_ops = { |
416e2d63 JB |
696 | .power_off = native_machine_power_off, |
697 | .shutdown = native_machine_shutdown, | |
698 | .emergency_restart = native_machine_emergency_restart, | |
699 | .restart = native_machine_restart, | |
ed23dc6f GC |
700 | .halt = native_machine_halt, |
701 | #ifdef CONFIG_KEXEC | |
702 | .crash_shutdown = native_machine_crash_shutdown, | |
703 | #endif | |
07f3331c | 704 | }; |
416e2d63 JB |
705 | |
706 | void machine_power_off(void) | |
707 | { | |
708 | machine_ops.power_off(); | |
709 | } | |
710 | ||
711 | void machine_shutdown(void) | |
712 | { | |
713 | machine_ops.shutdown(); | |
714 | } | |
715 | ||
716 | void machine_emergency_restart(void) | |
717 | { | |
d176720d | 718 | __machine_emergency_restart(1); |
416e2d63 JB |
719 | } |
720 | ||
721 | void machine_restart(char *cmd) | |
722 | { | |
723 | machine_ops.restart(cmd); | |
724 | } | |
725 | ||
726 | void machine_halt(void) | |
727 | { | |
728 | machine_ops.halt(); | |
729 | } | |
730 | ||
ed23dc6f GC |
731 | #ifdef CONFIG_KEXEC |
732 | void machine_crash_shutdown(struct pt_regs *regs) | |
733 | { | |
734 | machine_ops.crash_shutdown(regs); | |
735 | } | |
736 | #endif | |
2ddded21 EH |
737 | |
738 | ||
bb8dd270 | 739 | #if defined(CONFIG_SMP) |
2ddded21 EH |
740 | |
741 | /* This keeps a track of which one is crashing cpu. */ | |
742 | static int crashing_cpu; | |
743 | static nmi_shootdown_cb shootdown_callback; | |
744 | ||
745 | static atomic_t waiting_for_crash_ipi; | |
746 | ||
9c48f1c6 | 747 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
748 | { |
749 | int cpu; | |
750 | ||
2ddded21 EH |
751 | cpu = raw_smp_processor_id(); |
752 | ||
144d102b ML |
753 | /* |
754 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
755 | * Otherwise, system will completely hang. Crashing cpu can get |
756 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
757 | */ | |
758 | if (cpu == crashing_cpu) | |
9c48f1c6 | 759 | return NMI_HANDLED; |
2ddded21 EH |
760 | local_irq_disable(); |
761 | ||
9c48f1c6 | 762 | shootdown_callback(cpu, regs); |
2ddded21 EH |
763 | |
764 | atomic_dec(&waiting_for_crash_ipi); | |
765 | /* Assume hlt works */ | |
766 | halt(); | |
767 | for (;;) | |
768 | cpu_relax(); | |
769 | ||
9c48f1c6 | 770 | return NMI_HANDLED; |
2ddded21 EH |
771 | } |
772 | ||
773 | static void smp_send_nmi_allbutself(void) | |
774 | { | |
dac5f412 | 775 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
776 | } |
777 | ||
144d102b ML |
778 | /* |
779 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
780 | * |
781 | * This function can be used to halt all other CPUs on crash | |
782 | * or emergency reboot time. The function passed as parameter | |
783 | * will be called inside a NMI handler on all CPUs. | |
784 | */ | |
2ddded21 EH |
785 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
786 | { | |
787 | unsigned long msecs; | |
c415b3dc | 788 | local_irq_disable(); |
2ddded21 | 789 | |
144d102b | 790 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
791 | crashing_cpu = safe_smp_processor_id(); |
792 | ||
793 | shootdown_callback = callback; | |
794 | ||
795 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
796 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
797 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
798 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
799 | return; /* Return what? */ |
800 | /* | |
801 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
802 | * out the NMI |
803 | */ | |
804 | wmb(); | |
805 | ||
806 | smp_send_nmi_allbutself(); | |
807 | ||
808 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
809 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
810 | mdelay(1); | |
811 | msecs--; | |
812 | } | |
813 | ||
814 | /* Leave the nmi callback set */ | |
815 | } | |
bb8dd270 EH |
816 | #else /* !CONFIG_SMP */ |
817 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
818 | { | |
819 | /* No other CPUs to shoot down */ | |
820 | } | |
2ddded21 | 821 | #endif |