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 | 193 | |
aadca6fa CG |
194 | /* Certec */ |
195 | { /* Handle problems with rebooting on Certec BPC600 */ | |
196 | .callback = set_pci_reboot, | |
197 | .ident = "Certec BPC600", | |
198 | .matches = { | |
199 | DMI_MATCH(DMI_SYS_VENDOR, "Certec"), | |
200 | DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"), | |
201 | }, | |
202 | }, | |
203 | ||
e56e57f6 DJ |
204 | /* Dell */ |
205 | { /* Handle problems with rebooting on Dell DXP061 */ | |
093bac15 | 206 | .callback = set_bios_reboot, |
e56e57f6 | 207 | .ident = "Dell DXP061", |
093bac15 SC |
208 | .matches = { |
209 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 210 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), |
093bac15 SC |
211 | }, |
212 | }, | |
e56e57f6 | 213 | { /* Handle problems with rebooting on Dell E520's */ |
4a4aca64 | 214 | .callback = set_bios_reboot, |
e56e57f6 | 215 | .ident = "Dell E520", |
4a4aca64 JD |
216 | .matches = { |
217 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 218 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), |
4a4aca64 JD |
219 | }, |
220 | }, | |
986189f9 LT |
221 | { /* Handle problems with rebooting on the Latitude E5410. */ |
222 | .callback = set_pci_reboot, | |
223 | .ident = "Dell Latitude E5410", | |
35ea63d7 LO |
224 | .matches = { |
225 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
986189f9 | 226 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"), |
35ea63d7 LO |
227 | }, |
228 | }, | |
e56e57f6 DJ |
229 | { /* Handle problems with rebooting on the Latitude E5420. */ |
230 | .callback = set_pci_reboot, | |
231 | .ident = "Dell Latitude E5420", | |
1da177e4 | 232 | .matches = { |
35ea63d7 | 233 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 | 234 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), |
1da177e4 LT |
235 | }, |
236 | }, | |
e56e57f6 DJ |
237 | { /* Handle problems with rebooting on the Latitude E6320. */ |
238 | .callback = set_pci_reboot, | |
239 | .ident = "Dell Latitude E6320", | |
fab3b58d IM |
240 | .matches = { |
241 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 242 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), |
fab3b58d IM |
243 | }, |
244 | }, | |
e56e57f6 DJ |
245 | { /* Handle problems with rebooting on the Latitude E6420. */ |
246 | .callback = set_pci_reboot, | |
247 | .ident = "Dell Latitude E6420", | |
890ffedc TB |
248 | .matches = { |
249 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 250 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), |
890ffedc TB |
251 | }, |
252 | }, | |
e56e57f6 | 253 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
d91b14c4 | 254 | .callback = set_bios_reboot, |
e56e57f6 | 255 | .ident = "Dell OptiPlex 330", |
d91b14c4 | 256 | .matches = { |
890ffedc | 257 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
258 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), |
259 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
d91b14c4 TV |
260 | }, |
261 | }, | |
e56e57f6 | 262 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
dd4124a8 | 263 | .callback = set_bios_reboot, |
e56e57f6 | 264 | .ident = "Dell OptiPlex 360", |
dd4124a8 LO |
265 | .matches = { |
266 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 DJ |
267 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), |
268 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
dd4124a8 LO |
269 | }, |
270 | }, | |
e56e57f6 | 271 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
c5da9a2b | 272 | .callback = set_bios_reboot, |
e56e57f6 | 273 | .ident = "Dell OptiPlex 745", |
c5da9a2b AC |
274 | .matches = { |
275 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 276 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
c5da9a2b AC |
277 | }, |
278 | }, | |
e56e57f6 | 279 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
88dff493 | 280 | .callback = set_bios_reboot, |
e56e57f6 | 281 | .ident = "Dell OptiPlex 745", |
88dff493 | 282 | .matches = { |
c5da9a2b | 283 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
284 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
285 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
88dff493 ZR |
286 | }, |
287 | }, | |
e56e57f6 | 288 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
4832ddda | 289 | .callback = set_bios_reboot, |
e56e57f6 | 290 | .ident = "Dell OptiPlex 745", |
b49c78d4 | 291 | .matches = { |
e56e57f6 DJ |
292 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
293 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
294 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
b49c78d4 PC |
295 | }, |
296 | }, | |
e56e57f6 | 297 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
4832ddda | 298 | .callback = set_bios_reboot, |
e56e57f6 | 299 | .ident = "Dell OptiPlex 760", |
6c6c51e4 | 300 | .matches = { |
e56e57f6 DJ |
301 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
302 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
303 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
6c6c51e4 PM |
304 | }, |
305 | }, | |
e56e57f6 | 306 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
498cdbfb | 307 | .callback = set_pci_reboot, |
e56e57f6 | 308 | .ident = "Dell OptiPlex 990", |
498cdbfb | 309 | .matches = { |
e56e57f6 DJ |
310 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
311 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
498cdbfb OÇ |
312 | }, |
313 | }, | |
e56e57f6 DJ |
314 | { /* Handle problems with rebooting on Dell 300's */ |
315 | .callback = set_bios_reboot, | |
316 | .ident = "Dell PowerEdge 300", | |
05154752 | 317 | .matches = { |
e56e57f6 DJ |
318 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
319 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
05154752 GH |
320 | }, |
321 | }, | |
e56e57f6 DJ |
322 | { /* Handle problems with rebooting on Dell 1300's */ |
323 | .callback = set_bios_reboot, | |
324 | .ident = "Dell PowerEdge 1300", | |
0a832320 | 325 | .matches = { |
e56e57f6 DJ |
326 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
327 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
0a832320 JM |
328 | }, |
329 | }, | |
e56e57f6 DJ |
330 | { /* Handle problems with rebooting on Dell 2400's */ |
331 | .callback = set_bios_reboot, | |
332 | .ident = "Dell PowerEdge 2400", | |
3628c3f5 | 333 | .matches = { |
e56e57f6 DJ |
334 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
335 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
3628c3f5 MR |
336 | }, |
337 | }, | |
e56e57f6 | 338 | { /* Handle problems with rebooting on the Dell PowerEdge C6100. */ |
8412da75 | 339 | .callback = set_pci_reboot, |
e56e57f6 | 340 | .ident = "Dell PowerEdge C6100", |
8412da75 | 341 | .matches = { |
e56e57f6 DJ |
342 | DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
343 | DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), | |
8412da75 VS |
344 | }, |
345 | }, | |
e56e57f6 | 346 | { /* Handle problems with rebooting on the Precision M6600. */ |
b7798d28 | 347 | .callback = set_pci_reboot, |
e56e57f6 | 348 | .ident = "Dell Precision M6600", |
b7798d28 DB |
349 | .matches = { |
350 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 351 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), |
b7798d28 DB |
352 | }, |
353 | }, | |
e56e57f6 DJ |
354 | { /* Handle problems with rebooting on Dell T5400's */ |
355 | .callback = set_bios_reboot, | |
356 | .ident = "Dell Precision T5400", | |
a536877e PA |
357 | .matches = { |
358 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 359 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), |
a536877e PA |
360 | }, |
361 | }, | |
e56e57f6 DJ |
362 | { /* Handle problems with rebooting on Dell T7400's */ |
363 | .callback = set_bios_reboot, | |
364 | .ident = "Dell Precision T7400", | |
6be30bb7 RW |
365 | .matches = { |
366 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 367 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), |
6be30bb7 RW |
368 | }, |
369 | }, | |
e56e57f6 DJ |
370 | { /* Handle problems with rebooting on Dell XPS710 */ |
371 | .callback = set_bios_reboot, | |
372 | .ident = "Dell XPS710", | |
76eb9a30 ZR |
373 | .matches = { |
374 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 375 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), |
76eb9a30 ZR |
376 | }, |
377 | }, | |
e56e57f6 DJ |
378 | |
379 | /* Hewlett-Packard */ | |
380 | { /* Handle problems with rebooting on HP laptops */ | |
381 | .callback = set_bios_reboot, | |
382 | .ident = "HP Compaq Laptop", | |
4f0acd31 | 383 | .matches = { |
e56e57f6 DJ |
384 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
385 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), | |
4f0acd31 MS |
386 | }, |
387 | }, | |
e56e57f6 DJ |
388 | |
389 | /* Sony */ | |
390 | { /* Handle problems with rebooting on Sony VGN-Z540N */ | |
391 | .callback = set_bios_reboot, | |
392 | .ident = "Sony VGN-Z540N", | |
4f0acd31 | 393 | .matches = { |
e56e57f6 DJ |
394 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
395 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
4f0acd31 MS |
396 | }, |
397 | }, | |
e56e57f6 | 398 | |
6c6c51e4 PM |
399 | { } |
400 | }; | |
401 | ||
57b16594 | 402 | static int __init reboot_init(void) |
6c6c51e4 | 403 | { |
144d102b ML |
404 | /* |
405 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
406 | * on the command line |
407 | */ | |
144d102b | 408 | if (reboot_default) |
57b16594 | 409 | dmi_check_system(reboot_dmi_table); |
6c6c51e4 PM |
410 | return 0; |
411 | } | |
57b16594 | 412 | core_initcall(reboot_init); |
6c6c51e4 | 413 | |
4d022e35 MB |
414 | static inline void kb_wait(void) |
415 | { | |
416 | int i; | |
417 | ||
c84d6af8 AC |
418 | for (i = 0; i < 0x10000; i++) { |
419 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 420 | break; |
c84d6af8 AC |
421 | udelay(2); |
422 | } | |
4d022e35 MB |
423 | } |
424 | ||
9c48f1c6 | 425 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
426 | { |
427 | cpu_emergency_vmxoff(); | |
428 | } | |
429 | ||
144d102b | 430 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
431 | static void emergency_vmx_disable_all(void) |
432 | { | |
433 | /* Just make sure we won't change CPUs while doing this */ | |
434 | local_irq_disable(); | |
435 | ||
144d102b ML |
436 | /* |
437 | * We need to disable VMX on all CPUs before rebooting, otherwise | |
d176720d EH |
438 | * we risk hanging up the machine, because the CPU ignore INIT |
439 | * signals when VMX is enabled. | |
440 | * | |
441 | * We can't take any locks and we may be on an inconsistent | |
442 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
443 | * VMX and halt. | |
444 | * | |
445 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
446 | * stuff unnecessarily, but we don't have a way to check | |
447 | * if other CPUs have VMX enabled. So we will call it only if the | |
448 | * CPU we are running on has VMX enabled. | |
449 | * | |
450 | * We will miss cases where VMX is not enabled on all CPUs. This | |
451 | * shouldn't do much harm because KVM always enable VMX on all | |
452 | * CPUs anyway. But we can miss it on the small window where KVM | |
453 | * is still enabling VMX. | |
454 | */ | |
455 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
144d102b | 456 | /* Disable VMX on this CPU. */ |
d176720d EH |
457 | cpu_vmxoff(); |
458 | ||
459 | /* Halt and disable VMX on the other CPUs */ | |
460 | nmi_shootdown_cpus(vmxoff_nmi); | |
461 | ||
462 | } | |
463 | } | |
464 | ||
465 | ||
7432d149 IM |
466 | void __attribute__((weak)) mach_reboot_fixups(void) |
467 | { | |
468 | } | |
469 | ||
660e34ce | 470 | /* |
5be44a6f IM |
471 | * To the best of our knowledge Windows compatible x86 hardware expects |
472 | * the following on reboot: | |
660e34ce MG |
473 | * |
474 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
475 | * 2) If still alive, write to the keyboard controller | |
476 | * 3) If still alive, write to the ACPI reboot register again | |
477 | * 4) If still alive, write to the keyboard controller again | |
a4f1987e | 478 | * 5) If still alive, call the EFI runtime service to reboot |
5be44a6f | 479 | * 6) If no EFI runtime service, call the BIOS to do a reboot |
660e34ce | 480 | * |
5be44a6f IM |
481 | * We default to following the same pattern. We also have |
482 | * two other reboot methods: 'triple fault' and 'PCI', which | |
483 | * can be triggered via the reboot= kernel boot option or | |
484 | * via quirks. | |
485 | * | |
486 | * This means that this function can never return, it can misbehave | |
487 | * by not rebooting properly and hanging. | |
660e34ce | 488 | */ |
416e2d63 | 489 | static void native_machine_emergency_restart(void) |
1da177e4 | 490 | { |
4d022e35 | 491 | int i; |
660e34ce MG |
492 | int attempt = 0; |
493 | int orig_reboot_type = reboot_type; | |
edf2b139 | 494 | unsigned short mode; |
4d022e35 | 495 | |
d176720d EH |
496 | if (reboot_emergency) |
497 | emergency_vmx_disable_all(); | |
498 | ||
840c2baf JC |
499 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
500 | ||
4d022e35 | 501 | /* Tell the BIOS if we want cold or warm reboot */ |
edf2b139 RH |
502 | mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
503 | *((unsigned short *)__va(0x472)) = mode; | |
4d022e35 MB |
504 | |
505 | for (;;) { | |
506 | /* Could also try the reset bit in the Hammer NB */ | |
507 | switch (reboot_type) { | |
5be44a6f IM |
508 | case BOOT_ACPI: |
509 | acpi_reboot(); | |
510 | reboot_type = BOOT_KBD; | |
511 | break; | |
512 | ||
4d022e35 | 513 | case BOOT_KBD: |
144d102b | 514 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 515 | |
4d022e35 MB |
516 | for (i = 0; i < 10; i++) { |
517 | kb_wait(); | |
518 | udelay(50); | |
144d102b | 519 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
520 | udelay(50); |
521 | } | |
660e34ce MG |
522 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
523 | attempt = 1; | |
524 | reboot_type = BOOT_ACPI; | |
525 | } else { | |
a4f1987e | 526 | reboot_type = BOOT_EFI; |
660e34ce MG |
527 | } |
528 | break; | |
4d022e35 | 529 | |
4d022e35 | 530 | case BOOT_EFI: |
8562c99c | 531 | efi_reboot(reboot_mode, NULL); |
5be44a6f IM |
532 | reboot_type = BOOT_BIOS; |
533 | break; | |
534 | ||
535 | case BOOT_BIOS: | |
536 | machine_real_restart(MRR_BIOS); | |
537 | ||
538 | /* We're probably dead after this, but... */ | |
539 | reboot_type = BOOT_CF9_SAFE; | |
14d7ca5c | 540 | break; |
4d022e35 | 541 | |
5be44a6f | 542 | case BOOT_CF9_FORCE: |
14d7ca5c | 543 | port_cf9_safe = true; |
144d102b | 544 | /* Fall through */ |
4d022e35 | 545 | |
5be44a6f | 546 | case BOOT_CF9_SAFE: |
14d7ca5c | 547 | if (port_cf9_safe) { |
5be44a6f | 548 | u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E; |
16c21ae5 | 549 | u8 cf9 = inb(0xcf9) & ~reboot_code; |
14d7ca5c PA |
550 | outb(cf9|2, 0xcf9); /* Request hard reset */ |
551 | udelay(50); | |
16c21ae5 LF |
552 | /* Actually do the reset */ |
553 | outb(cf9|reboot_code, 0xcf9); | |
14d7ca5c PA |
554 | udelay(50); |
555 | } | |
5be44a6f IM |
556 | reboot_type = BOOT_TRIPLE; |
557 | break; | |
558 | ||
559 | case BOOT_TRIPLE: | |
560 | load_idt(&no_idt); | |
561 | __asm__ __volatile__("int3"); | |
562 | ||
563 | /* We're probably dead after this, but... */ | |
564 | reboot_type = BOOT_KBD; | |
4d022e35 MB |
565 | break; |
566 | } | |
567 | } | |
568 | } | |
569 | ||
3c62c625 | 570 | void native_machine_shutdown(void) |
4d022e35 MB |
571 | { |
572 | /* Stop the cpus and apics */ | |
522e6646 | 573 | #ifdef CONFIG_X86_IO_APIC |
2885432a FY |
574 | /* |
575 | * Disabling IO APIC before local APIC is a workaround for | |
576 | * erratum AVR31 in "Intel Atom Processor C2000 Product Family | |
577 | * Specification Update". In this situation, interrupts that target | |
578 | * a Logical Processor whose Local APIC is either in the process of | |
579 | * being hardware disabled or software disabled are neither delivered | |
580 | * nor discarded. When this erratum occurs, the processor may hang. | |
581 | * | |
582 | * Even without the erratum, it still makes sense to quiet IO APIC | |
583 | * before disabling Local APIC. | |
584 | */ | |
522e6646 FY |
585 | disable_IO_APIC(); |
586 | #endif | |
587 | ||
1da177e4 | 588 | #ifdef CONFIG_SMP |
144d102b | 589 | /* |
1b3a5d02 RH |
590 | * Stop all of the others. Also disable the local irq to |
591 | * not receive the per-cpu timer interrupt which may trigger | |
592 | * scheduler's load balance. | |
1da177e4 | 593 | */ |
55c844a4 | 594 | local_irq_disable(); |
76fac077 | 595 | stop_other_cpus(); |
4d022e35 | 596 | #endif |
1da177e4 LT |
597 | |
598 | lapic_shutdown(); | |
599 | ||
c86c7fbc OH |
600 | #ifdef CONFIG_HPET_TIMER |
601 | hpet_disable(); | |
602 | #endif | |
dd2a1305 | 603 | |
4d022e35 | 604 | #ifdef CONFIG_X86_64 |
338bac52 | 605 | x86_platform.iommu_shutdown(); |
4d022e35 | 606 | #endif |
973efae2 JF |
607 | } |
608 | ||
d176720d EH |
609 | static void __machine_emergency_restart(int emergency) |
610 | { | |
611 | reboot_emergency = emergency; | |
612 | machine_ops.emergency_restart(); | |
613 | } | |
614 | ||
416e2d63 | 615 | static void native_machine_restart(char *__unused) |
dd2a1305 | 616 | { |
c767a54b | 617 | pr_notice("machine restart\n"); |
1da177e4 | 618 | |
4d022e35 MB |
619 | if (!reboot_force) |
620 | machine_shutdown(); | |
d176720d | 621 | __machine_emergency_restart(0); |
4a1421f8 EB |
622 | } |
623 | ||
416e2d63 | 624 | static void native_machine_halt(void) |
1da177e4 | 625 | { |
144d102b | 626 | /* Stop other cpus and apics */ |
d3ec5cae IV |
627 | machine_shutdown(); |
628 | ||
840c2baf JC |
629 | tboot_shutdown(TB_SHUTDOWN_HALT); |
630 | ||
d3ec5cae | 631 | stop_this_cpu(NULL); |
1da177e4 LT |
632 | } |
633 | ||
416e2d63 | 634 | static void native_machine_power_off(void) |
1da177e4 | 635 | { |
6e3fbee5 | 636 | if (pm_power_off) { |
4d022e35 MB |
637 | if (!reboot_force) |
638 | machine_shutdown(); | |
1da177e4 | 639 | pm_power_off(); |
6e3fbee5 | 640 | } |
144d102b | 641 | /* A fallback in case there is no PM info available */ |
840c2baf | 642 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
643 | } |
644 | ||
07f3331c | 645 | struct machine_ops machine_ops = { |
416e2d63 JB |
646 | .power_off = native_machine_power_off, |
647 | .shutdown = native_machine_shutdown, | |
648 | .emergency_restart = native_machine_emergency_restart, | |
649 | .restart = native_machine_restart, | |
ed23dc6f GC |
650 | .halt = native_machine_halt, |
651 | #ifdef CONFIG_KEXEC | |
652 | .crash_shutdown = native_machine_crash_shutdown, | |
653 | #endif | |
07f3331c | 654 | }; |
416e2d63 JB |
655 | |
656 | void machine_power_off(void) | |
657 | { | |
658 | machine_ops.power_off(); | |
659 | } | |
660 | ||
661 | void machine_shutdown(void) | |
662 | { | |
663 | machine_ops.shutdown(); | |
664 | } | |
665 | ||
666 | void machine_emergency_restart(void) | |
667 | { | |
d176720d | 668 | __machine_emergency_restart(1); |
416e2d63 JB |
669 | } |
670 | ||
671 | void machine_restart(char *cmd) | |
672 | { | |
673 | machine_ops.restart(cmd); | |
674 | } | |
675 | ||
676 | void machine_halt(void) | |
677 | { | |
678 | machine_ops.halt(); | |
679 | } | |
680 | ||
ed23dc6f GC |
681 | #ifdef CONFIG_KEXEC |
682 | void machine_crash_shutdown(struct pt_regs *regs) | |
683 | { | |
684 | machine_ops.crash_shutdown(regs); | |
685 | } | |
686 | #endif | |
2ddded21 EH |
687 | |
688 | ||
bb8dd270 | 689 | #if defined(CONFIG_SMP) |
2ddded21 EH |
690 | |
691 | /* This keeps a track of which one is crashing cpu. */ | |
692 | static int crashing_cpu; | |
693 | static nmi_shootdown_cb shootdown_callback; | |
694 | ||
695 | static atomic_t waiting_for_crash_ipi; | |
696 | ||
9c48f1c6 | 697 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
698 | { |
699 | int cpu; | |
700 | ||
2ddded21 EH |
701 | cpu = raw_smp_processor_id(); |
702 | ||
144d102b ML |
703 | /* |
704 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
705 | * Otherwise, system will completely hang. Crashing cpu can get |
706 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
707 | */ | |
708 | if (cpu == crashing_cpu) | |
9c48f1c6 | 709 | return NMI_HANDLED; |
2ddded21 EH |
710 | local_irq_disable(); |
711 | ||
9c48f1c6 | 712 | shootdown_callback(cpu, regs); |
2ddded21 EH |
713 | |
714 | atomic_dec(&waiting_for_crash_ipi); | |
715 | /* Assume hlt works */ | |
716 | halt(); | |
717 | for (;;) | |
718 | cpu_relax(); | |
719 | ||
9c48f1c6 | 720 | return NMI_HANDLED; |
2ddded21 EH |
721 | } |
722 | ||
723 | static void smp_send_nmi_allbutself(void) | |
724 | { | |
dac5f412 | 725 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
726 | } |
727 | ||
144d102b ML |
728 | /* |
729 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
730 | * |
731 | * This function can be used to halt all other CPUs on crash | |
732 | * or emergency reboot time. The function passed as parameter | |
733 | * will be called inside a NMI handler on all CPUs. | |
734 | */ | |
2ddded21 EH |
735 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
736 | { | |
737 | unsigned long msecs; | |
c415b3dc | 738 | local_irq_disable(); |
2ddded21 | 739 | |
144d102b | 740 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
741 | crashing_cpu = safe_smp_processor_id(); |
742 | ||
743 | shootdown_callback = callback; | |
744 | ||
745 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
746 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
747 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
748 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
749 | return; /* Return what? */ |
750 | /* | |
751 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
752 | * out the NMI |
753 | */ | |
754 | wmb(); | |
755 | ||
756 | smp_send_nmi_allbutself(); | |
757 | ||
758 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
759 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
760 | mdelay(1); | |
761 | msecs--; | |
762 | } | |
763 | ||
764 | /* Leave the nmi callback set */ | |
765 | } | |
bb8dd270 EH |
766 | #else /* !CONFIG_SMP */ |
767 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
768 | { | |
769 | /* No other CPUs to shoot down */ | |
770 | } | |
2ddded21 | 771 | #endif |