Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/module.h> |
cd6ed525 | 2 | #include <linux/reboot.h> |
4d022e35 MB |
3 | #include <linux/init.h> |
4 | #include <linux/pm.h> | |
5 | #include <linux/efi.h> | |
6c6c51e4 | 6 | #include <linux/dmi.h> |
d43c36dc | 7 | #include <linux/sched.h> |
69575d38 | 8 | #include <linux/tboot.h> |
ca444564 | 9 | #include <linux/delay.h> |
4d022e35 MB |
10 | #include <acpi/reboot.h> |
11 | #include <asm/io.h> | |
1da177e4 | 12 | #include <asm/apic.h> |
4d37e7e3 | 13 | #include <asm/desc.h> |
4d022e35 | 14 | #include <asm/hpet.h> |
68db065c | 15 | #include <asm/pgtable.h> |
4412620f | 16 | #include <asm/proto.h> |
973efae2 | 17 | #include <asm/reboot_fixups.h> |
07f3331c | 18 | #include <asm/reboot.h> |
82487711 | 19 | #include <asm/pci_x86.h> |
d176720d | 20 | #include <asm/virtext.h> |
96b89dc6 | 21 | #include <asm/cpu.h> |
c410b830 | 22 | #include <asm/nmi.h> |
1da177e4 | 23 | |
4d022e35 | 24 | #ifdef CONFIG_X86_32 |
4d022e35 MB |
25 | # include <linux/ctype.h> |
26 | # include <linux/mc146818rtc.h> | |
5a8c9aeb | 27 | # include <asm/realmode.h> |
4d022e35 | 28 | #else |
338bac52 | 29 | # include <asm/x86_init.h> |
4d022e35 MB |
30 | #endif |
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 = {}; |
1da177e4 | 39 | static int 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 | ||
4d022e35 | 52 | #if defined(CONFIG_X86_32) && defined(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 | |
70 | * bios Reboot by jumping through the BIOS (only for X86_32) | |
71 | * smp Reboot by executing reset on BSP or other CPU (only for X86_32) | |
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': |
1da177e4 LT |
91 | reboot_mode = 0x1234; |
92 | break; | |
4d022e35 MB |
93 | |
94 | case 'c': | |
95 | reboot_mode = 0; | |
1da177e4 | 96 | break; |
4d022e35 MB |
97 | |
98 | #ifdef CONFIG_X86_32 | |
1da177e4 | 99 | #ifdef CONFIG_SMP |
4d022e35 | 100 | case 's': |
6f673d83 | 101 | if (isdigit(*(str+1))) { |
1da177e4 | 102 | reboot_cpu = (int) (*(str+1) - '0'); |
6f673d83 | 103 | if (isdigit(*(str+2))) |
1da177e4 LT |
104 | reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
105 | } | |
144d102b ML |
106 | /* |
107 | * We will leave sorting out the final value | |
108 | * when we are ready to reboot, since we might not | |
109 | * have detected BSP APIC ID or smp_num_cpu | |
110 | */ | |
1da177e4 | 111 | break; |
4d022e35 MB |
112 | #endif /* CONFIG_SMP */ |
113 | ||
114 | case 'b': | |
1da177e4 | 115 | #endif |
4d022e35 MB |
116 | case 'a': |
117 | case 'k': | |
118 | case 't': | |
119 | case 'e': | |
14d7ca5c | 120 | case 'p': |
4d022e35 MB |
121 | reboot_type = *str; |
122 | break; | |
123 | ||
124 | case 'f': | |
125 | reboot_force = 1; | |
126 | break; | |
1da177e4 | 127 | } |
4d022e35 MB |
128 | |
129 | str = strchr(str, ','); | |
130 | if (str) | |
1da177e4 LT |
131 | str++; |
132 | else | |
133 | break; | |
134 | } | |
135 | return 1; | |
136 | } | |
137 | ||
138 | __setup("reboot=", reboot_setup); | |
139 | ||
4d022e35 MB |
140 | |
141 | #ifdef CONFIG_X86_32 | |
1da177e4 LT |
142 | /* |
143 | * Reboot options and system auto-detection code provided by | |
144 | * Dell Inc. so their systems "just work". :-) | |
145 | */ | |
146 | ||
147 | /* | |
1ef03890 | 148 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 149 | * this quirk makes that automatic. |
1da177e4 | 150 | */ |
1855256c | 151 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 152 | { |
4d022e35 MB |
153 | if (reboot_type != BOOT_BIOS) { |
154 | reboot_type = BOOT_BIOS; | |
1da177e4 LT |
155 | printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); |
156 | } | |
157 | return 0; | |
158 | } | |
159 | ||
57b16594 ML |
160 | void machine_real_restart(unsigned int type) |
161 | { | |
731a7378 LT |
162 | void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int)) |
163 | real_mode_header->machine_real_restart_asm; | |
57b16594 ML |
164 | |
165 | local_irq_disable(); | |
166 | ||
144d102b ML |
167 | /* |
168 | * Write zero to CMOS register number 0x0f, which the BIOS POST | |
169 | * routine will recognize as telling it to do a proper reboot. (Well | |
170 | * that's what this book in front of me says -- it may only apply to | |
171 | * the Phoenix BIOS though, it's not clear). At the same time, | |
172 | * disable NMIs by setting the top bit in the CMOS address register, | |
173 | * as we're about to do peculiar things to the CPU. I'm not sure if | |
174 | * `outb_p' is needed instead of just `outb'. Use it to be on the | |
175 | * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
57b16594 ML |
176 | */ |
177 | spin_lock(&rtc_lock); | |
178 | CMOS_WRITE(0x00, 0x8f); | |
179 | spin_unlock(&rtc_lock); | |
180 | ||
181 | /* | |
182 | * Switch back to the initial page table. | |
183 | */ | |
184 | load_cr3(initial_page_table); | |
185 | ||
144d102b ML |
186 | /* |
187 | * Write 0x1234 to absolute memory location 0x472. The BIOS reads | |
188 | * this on booting to tell it to "Bypass memory test (also warm | |
189 | * boot)". This seems like a fairly standard thing that gets set by | |
190 | * REBOOT.COM programs, and the previous reset routine did this | |
191 | * too. */ | |
57b16594 ML |
192 | *((unsigned short *)0x472) = reboot_mode; |
193 | ||
57b16594 ML |
194 | /* Jump to the identity-mapped low memory code */ |
195 | restart_lowmem(type); | |
196 | } | |
197 | #ifdef CONFIG_APM_MODULE | |
198 | EXPORT_SYMBOL(machine_real_restart); | |
199 | #endif | |
200 | ||
201 | #endif /* CONFIG_X86_32 */ | |
202 | ||
203 | /* | |
204 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot | |
205 | */ | |
206 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
207 | { | |
208 | if (reboot_type != BOOT_CF9) { | |
209 | reboot_type = BOOT_CF9; | |
210 | printk(KERN_INFO "%s series board detected. " | |
211 | "Selecting PCI-method for reboots.\n", d->ident); | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
1ef03890 PC |
216 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
217 | { | |
218 | if (reboot_type != BOOT_KBD) { | |
219 | reboot_type = BOOT_KBD; | |
220 | printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident); | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
144d102b ML |
225 | /* |
226 | * This is a single dmi_table handling all reboot quirks. Note that | |
57b16594 ML |
227 | * REBOOT_BIOS is only available for 32bit |
228 | */ | |
1da177e4 | 229 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
57b16594 | 230 | #ifdef CONFIG_X86_32 |
b9e82af8 TG |
231 | { /* Handle problems with rebooting on Dell E520's */ |
232 | .callback = set_bios_reboot, | |
233 | .ident = "Dell E520", | |
234 | .matches = { | |
235 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
236 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), | |
237 | }, | |
238 | }, | |
1da177e4 | 239 | { /* Handle problems with rebooting on Dell 1300's */ |
dd2a1305 | 240 | .callback = set_bios_reboot, |
1da177e4 LT |
241 | .ident = "Dell PowerEdge 1300", |
242 | .matches = { | |
243 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
244 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
245 | }, | |
246 | }, | |
247 | { /* Handle problems with rebooting on Dell 300's */ | |
248 | .callback = set_bios_reboot, | |
249 | .ident = "Dell PowerEdge 300", | |
250 | .matches = { | |
251 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
252 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
253 | }, | |
254 | }, | |
144d102b | 255 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
df2edcf3 JJ |
256 | .callback = set_bios_reboot, |
257 | .ident = "Dell OptiPlex 745", | |
258 | .matches = { | |
259 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
260 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
df2edcf3 JJ |
261 | }, |
262 | }, | |
144d102b | 263 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
fc115bf1 CK |
264 | .callback = set_bios_reboot, |
265 | .ident = "Dell OptiPlex 745", | |
266 | .matches = { | |
267 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
268 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
269 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
270 | }, | |
271 | }, | |
144d102b | 272 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
fc1c8925 HAA |
273 | .callback = set_bios_reboot, |
274 | .ident = "Dell OptiPlex 745", | |
275 | .matches = { | |
276 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
277 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
278 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
279 | }, | |
280 | }, | |
144d102b | 281 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
093bac15 SC |
282 | .callback = set_bios_reboot, |
283 | .ident = "Dell OptiPlex 330", | |
284 | .matches = { | |
285 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
286 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), | |
287 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
288 | }, | |
289 | }, | |
144d102b | 290 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
4a4aca64 JD |
291 | .callback = set_bios_reboot, |
292 | .ident = "Dell OptiPlex 360", | |
293 | .matches = { | |
294 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
295 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), | |
296 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
297 | }, | |
298 | }, | |
144d102b | 299 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
35ea63d7 LO |
300 | .callback = set_bios_reboot, |
301 | .ident = "Dell OptiPlex 760", | |
302 | .matches = { | |
303 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
304 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
305 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
306 | }, | |
307 | }, | |
1da177e4 LT |
308 | { /* Handle problems with rebooting on Dell 2400's */ |
309 | .callback = set_bios_reboot, | |
310 | .ident = "Dell PowerEdge 2400", | |
311 | .matches = { | |
312 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
313 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
314 | }, | |
315 | }, | |
fab3b58d IM |
316 | { /* Handle problems with rebooting on Dell T5400's */ |
317 | .callback = set_bios_reboot, | |
318 | .ident = "Dell Precision T5400", | |
319 | .matches = { | |
320 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
321 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), | |
322 | }, | |
323 | }, | |
890ffedc TB |
324 | { /* Handle problems with rebooting on Dell T7400's */ |
325 | .callback = set_bios_reboot, | |
326 | .ident = "Dell Precision T7400", | |
327 | .matches = { | |
328 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
329 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), | |
330 | }, | |
331 | }, | |
766c3f94 | 332 | { /* Handle problems with rebooting on HP laptops */ |
d91b14c4 | 333 | .callback = set_bios_reboot, |
766c3f94 | 334 | .ident = "HP Compaq Laptop", |
d91b14c4 TV |
335 | .matches = { |
336 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
766c3f94 | 337 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
d91b14c4 TV |
338 | }, |
339 | }, | |
dd4124a8 LO |
340 | { /* Handle problems with rebooting on Dell XPS710 */ |
341 | .callback = set_bios_reboot, | |
342 | .ident = "Dell XPS710", | |
343 | .matches = { | |
344 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
345 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), | |
346 | }, | |
347 | }, | |
c5da9a2b AC |
348 | { /* Handle problems with rebooting on Dell DXP061 */ |
349 | .callback = set_bios_reboot, | |
350 | .ident = "Dell DXP061", | |
351 | .matches = { | |
352 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
353 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), | |
354 | }, | |
355 | }, | |
88dff493 ZR |
356 | { /* Handle problems with rebooting on Sony VGN-Z540N */ |
357 | .callback = set_bios_reboot, | |
358 | .ident = "Sony VGN-Z540N", | |
359 | .matches = { | |
360 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
361 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
362 | }, | |
363 | }, | |
77f32dfd DT |
364 | { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */ |
365 | .callback = set_bios_reboot, | |
366 | .ident = "CompuLab SBC-FITPC2", | |
367 | .matches = { | |
368 | DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"), | |
369 | DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"), | |
370 | }, | |
371 | }, | |
144d102b | 372 | { /* Handle problems with rebooting on ASUS P4S800 */ |
4832ddda LO |
373 | .callback = set_bios_reboot, |
374 | .ident = "ASUS P4S800", | |
375 | .matches = { | |
376 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
377 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
378 | }, | |
379 | }, | |
57b16594 ML |
380 | #endif /* CONFIG_X86_32 */ |
381 | ||
144d102b | 382 | { /* Handle reboot issue on Acer Aspire one */ |
1ef03890 | 383 | .callback = set_kbd_reboot, |
b49c78d4 PC |
384 | .ident = "Acer Aspire One A110", |
385 | .matches = { | |
386 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
387 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
388 | }, | |
389 | }, | |
3e03bbea | 390 | { /* Handle problems with rebooting on Apple MacBook5 */ |
6c6c51e4 | 391 | .callback = set_pci_reboot, |
3e03bbea | 392 | .ident = "Apple MacBook5", |
6c6c51e4 PM |
393 | .matches = { |
394 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 395 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), |
6c6c51e4 PM |
396 | }, |
397 | }, | |
3e03bbea | 398 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
498cdbfb | 399 | .callback = set_pci_reboot, |
3e03bbea | 400 | .ident = "Apple MacBookPro5", |
498cdbfb OÇ |
401 | .matches = { |
402 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 403 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), |
498cdbfb OÇ |
404 | }, |
405 | }, | |
05154752 GH |
406 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
407 | .callback = set_pci_reboot, | |
408 | .ident = "Apple Macmini3,1", | |
409 | .matches = { | |
410 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
411 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
412 | }, | |
413 | }, | |
0a832320 JM |
414 | { /* Handle problems with rebooting on the iMac9,1. */ |
415 | .callback = set_pci_reboot, | |
416 | .ident = "Apple iMac9,1", | |
417 | .matches = { | |
418 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
419 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
420 | }, | |
421 | }, | |
3628c3f5 MR |
422 | { /* Handle problems with rebooting on the Latitude E6320. */ |
423 | .callback = set_pci_reboot, | |
424 | .ident = "Dell Latitude E6320", | |
425 | .matches = { | |
426 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
427 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), | |
428 | }, | |
429 | }, | |
b7798d28 DB |
430 | { /* Handle problems with rebooting on the Latitude E5420. */ |
431 | .callback = set_pci_reboot, | |
432 | .ident = "Dell Latitude E5420", | |
433 | .matches = { | |
434 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
435 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), | |
436 | }, | |
437 | }, | |
a536877e PA |
438 | { /* Handle problems with rebooting on the Latitude E6420. */ |
439 | .callback = set_pci_reboot, | |
440 | .ident = "Dell Latitude E6420", | |
441 | .matches = { | |
442 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
443 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), | |
444 | }, | |
445 | }, | |
6be30bb7 RW |
446 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
447 | .callback = set_pci_reboot, | |
448 | .ident = "Dell OptiPlex 990", | |
449 | .matches = { | |
450 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
451 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
452 | }, | |
453 | }, | |
76eb9a30 ZR |
454 | { /* Handle problems with rebooting on the Precision M6600. */ |
455 | .callback = set_pci_reboot, | |
456 | .ident = "Dell OptiPlex 990", | |
457 | .matches = { | |
458 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
459 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), | |
460 | }, | |
461 | }, | |
6c6c51e4 PM |
462 | { } |
463 | }; | |
464 | ||
57b16594 | 465 | static int __init reboot_init(void) |
6c6c51e4 | 466 | { |
144d102b ML |
467 | /* |
468 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
469 | * on the command line |
470 | */ | |
144d102b | 471 | if (reboot_default) |
57b16594 | 472 | dmi_check_system(reboot_dmi_table); |
6c6c51e4 PM |
473 | return 0; |
474 | } | |
57b16594 | 475 | core_initcall(reboot_init); |
6c6c51e4 | 476 | |
4d022e35 MB |
477 | static inline void kb_wait(void) |
478 | { | |
479 | int i; | |
480 | ||
c84d6af8 AC |
481 | for (i = 0; i < 0x10000; i++) { |
482 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 483 | break; |
c84d6af8 AC |
484 | udelay(2); |
485 | } | |
4d022e35 MB |
486 | } |
487 | ||
9c48f1c6 | 488 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
489 | { |
490 | cpu_emergency_vmxoff(); | |
491 | } | |
492 | ||
144d102b | 493 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
494 | static void emergency_vmx_disable_all(void) |
495 | { | |
496 | /* Just make sure we won't change CPUs while doing this */ | |
497 | local_irq_disable(); | |
498 | ||
144d102b ML |
499 | /* |
500 | * We need to disable VMX on all CPUs before rebooting, otherwise | |
d176720d EH |
501 | * we risk hanging up the machine, because the CPU ignore INIT |
502 | * signals when VMX is enabled. | |
503 | * | |
504 | * We can't take any locks and we may be on an inconsistent | |
505 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
506 | * VMX and halt. | |
507 | * | |
508 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
509 | * stuff unnecessarily, but we don't have a way to check | |
510 | * if other CPUs have VMX enabled. So we will call it only if the | |
511 | * CPU we are running on has VMX enabled. | |
512 | * | |
513 | * We will miss cases where VMX is not enabled on all CPUs. This | |
514 | * shouldn't do much harm because KVM always enable VMX on all | |
515 | * CPUs anyway. But we can miss it on the small window where KVM | |
516 | * is still enabling VMX. | |
517 | */ | |
518 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
144d102b | 519 | /* Disable VMX on this CPU. */ |
d176720d EH |
520 | cpu_vmxoff(); |
521 | ||
522 | /* Halt and disable VMX on the other CPUs */ | |
523 | nmi_shootdown_cpus(vmxoff_nmi); | |
524 | ||
525 | } | |
526 | } | |
527 | ||
528 | ||
7432d149 IM |
529 | void __attribute__((weak)) mach_reboot_fixups(void) |
530 | { | |
531 | } | |
532 | ||
660e34ce MG |
533 | /* |
534 | * Windows compatible x86 hardware expects the following on reboot: | |
535 | * | |
536 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
537 | * 2) If still alive, write to the keyboard controller | |
538 | * 3) If still alive, write to the ACPI reboot register again | |
539 | * 4) If still alive, write to the keyboard controller again | |
540 | * | |
541 | * If the machine is still alive at this stage, it gives up. We default to | |
542 | * following the same pattern, except that if we're still alive after (4) we'll | |
543 | * try to force a triple fault and then cycle between hitting the keyboard | |
544 | * controller and doing that | |
545 | */ | |
416e2d63 | 546 | static void native_machine_emergency_restart(void) |
1da177e4 | 547 | { |
4d022e35 | 548 | int i; |
660e34ce MG |
549 | int attempt = 0; |
550 | int orig_reboot_type = reboot_type; | |
4d022e35 | 551 | |
d176720d EH |
552 | if (reboot_emergency) |
553 | emergency_vmx_disable_all(); | |
554 | ||
840c2baf JC |
555 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
556 | ||
4d022e35 MB |
557 | /* Tell the BIOS if we want cold or warm reboot */ |
558 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
559 | ||
560 | for (;;) { | |
561 | /* Could also try the reset bit in the Hammer NB */ | |
562 | switch (reboot_type) { | |
563 | case BOOT_KBD: | |
144d102b | 564 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 565 | |
4d022e35 MB |
566 | for (i = 0; i < 10; i++) { |
567 | kb_wait(); | |
568 | udelay(50); | |
144d102b | 569 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
570 | udelay(50); |
571 | } | |
660e34ce MG |
572 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
573 | attempt = 1; | |
574 | reboot_type = BOOT_ACPI; | |
575 | } else { | |
576 | reboot_type = BOOT_TRIPLE; | |
577 | } | |
578 | break; | |
4d022e35 MB |
579 | |
580 | case BOOT_TRIPLE: | |
ebdd561a | 581 | load_idt(&no_idt); |
4d022e35 MB |
582 | __asm__ __volatile__("int3"); |
583 | ||
584 | reboot_type = BOOT_KBD; | |
585 | break; | |
586 | ||
587 | #ifdef CONFIG_X86_32 | |
588 | case BOOT_BIOS: | |
3d35ac34 | 589 | machine_real_restart(MRR_BIOS); |
4d022e35 MB |
590 | |
591 | reboot_type = BOOT_KBD; | |
592 | break; | |
593 | #endif | |
594 | ||
595 | case BOOT_ACPI: | |
596 | acpi_reboot(); | |
597 | reboot_type = BOOT_KBD; | |
598 | break; | |
599 | ||
4d022e35 MB |
600 | case BOOT_EFI: |
601 | if (efi_enabled) | |
14d7ca5c PA |
602 | efi.reset_system(reboot_mode ? |
603 | EFI_RESET_WARM : | |
604 | EFI_RESET_COLD, | |
4d022e35 | 605 | EFI_SUCCESS, 0, NULL); |
b47b9288 | 606 | reboot_type = BOOT_KBD; |
14d7ca5c | 607 | break; |
4d022e35 | 608 | |
14d7ca5c PA |
609 | case BOOT_CF9: |
610 | port_cf9_safe = true; | |
144d102b | 611 | /* Fall through */ |
4d022e35 | 612 | |
14d7ca5c PA |
613 | case BOOT_CF9_COND: |
614 | if (port_cf9_safe) { | |
615 | u8 cf9 = inb(0xcf9) & ~6; | |
616 | outb(cf9|2, 0xcf9); /* Request hard reset */ | |
617 | udelay(50); | |
618 | outb(cf9|6, 0xcf9); /* Actually do the reset */ | |
619 | udelay(50); | |
620 | } | |
4d022e35 MB |
621 | reboot_type = BOOT_KBD; |
622 | break; | |
623 | } | |
624 | } | |
625 | } | |
626 | ||
3c62c625 | 627 | void native_machine_shutdown(void) |
4d022e35 MB |
628 | { |
629 | /* Stop the cpus and apics */ | |
1da177e4 | 630 | #ifdef CONFIG_SMP |
dd2a1305 EB |
631 | |
632 | /* The boot cpu is always logical cpu 0 */ | |
65c01184 | 633 | int reboot_cpu_id = 0; |
dd2a1305 | 634 | |
4d022e35 | 635 | #ifdef CONFIG_X86_32 |
dd2a1305 | 636 | /* See if there has been given a command line override */ |
9628937d | 637 | if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) && |
0bc3cc03 | 638 | cpu_online(reboot_cpu)) |
dd2a1305 | 639 | reboot_cpu_id = reboot_cpu; |
4d022e35 | 640 | #endif |
1da177e4 | 641 | |
4d022e35 | 642 | /* Make certain the cpu I'm about to reboot on is online */ |
0bc3cc03 | 643 | if (!cpu_online(reboot_cpu_id)) |
dd2a1305 | 644 | reboot_cpu_id = smp_processor_id(); |
dd2a1305 EB |
645 | |
646 | /* Make certain I only run on the appropriate processor */ | |
9628937d | 647 | set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); |
dd2a1305 | 648 | |
144d102b | 649 | /* |
55c844a4 FT |
650 | * O.K Now that I'm on the appropriate processor, stop all of the |
651 | * others. Also disable the local irq to not receive the per-cpu | |
652 | * timer interrupt which may trigger scheduler's load balance. | |
1da177e4 | 653 | */ |
55c844a4 | 654 | local_irq_disable(); |
76fac077 | 655 | stop_other_cpus(); |
4d022e35 | 656 | #endif |
1da177e4 LT |
657 | |
658 | lapic_shutdown(); | |
659 | ||
660 | #ifdef CONFIG_X86_IO_APIC | |
661 | disable_IO_APIC(); | |
662 | #endif | |
4d022e35 | 663 | |
c86c7fbc OH |
664 | #ifdef CONFIG_HPET_TIMER |
665 | hpet_disable(); | |
666 | #endif | |
dd2a1305 | 667 | |
4d022e35 | 668 | #ifdef CONFIG_X86_64 |
338bac52 | 669 | x86_platform.iommu_shutdown(); |
4d022e35 | 670 | #endif |
973efae2 JF |
671 | } |
672 | ||
d176720d EH |
673 | static void __machine_emergency_restart(int emergency) |
674 | { | |
675 | reboot_emergency = emergency; | |
676 | machine_ops.emergency_restart(); | |
677 | } | |
678 | ||
416e2d63 | 679 | static void native_machine_restart(char *__unused) |
dd2a1305 | 680 | { |
4d022e35 | 681 | printk("machine restart\n"); |
1da177e4 | 682 | |
4d022e35 MB |
683 | if (!reboot_force) |
684 | machine_shutdown(); | |
d176720d | 685 | __machine_emergency_restart(0); |
4a1421f8 EB |
686 | } |
687 | ||
416e2d63 | 688 | static void native_machine_halt(void) |
1da177e4 | 689 | { |
144d102b | 690 | /* Stop other cpus and apics */ |
d3ec5cae IV |
691 | machine_shutdown(); |
692 | ||
840c2baf JC |
693 | tboot_shutdown(TB_SHUTDOWN_HALT); |
694 | ||
d3ec5cae | 695 | stop_this_cpu(NULL); |
1da177e4 LT |
696 | } |
697 | ||
416e2d63 | 698 | static void native_machine_power_off(void) |
1da177e4 | 699 | { |
6e3fbee5 | 700 | if (pm_power_off) { |
4d022e35 MB |
701 | if (!reboot_force) |
702 | machine_shutdown(); | |
1da177e4 | 703 | pm_power_off(); |
6e3fbee5 | 704 | } |
144d102b | 705 | /* A fallback in case there is no PM info available */ |
840c2baf | 706 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
707 | } |
708 | ||
07f3331c | 709 | struct machine_ops machine_ops = { |
416e2d63 JB |
710 | .power_off = native_machine_power_off, |
711 | .shutdown = native_machine_shutdown, | |
712 | .emergency_restart = native_machine_emergency_restart, | |
713 | .restart = native_machine_restart, | |
ed23dc6f GC |
714 | .halt = native_machine_halt, |
715 | #ifdef CONFIG_KEXEC | |
716 | .crash_shutdown = native_machine_crash_shutdown, | |
717 | #endif | |
07f3331c | 718 | }; |
416e2d63 JB |
719 | |
720 | void machine_power_off(void) | |
721 | { | |
722 | machine_ops.power_off(); | |
723 | } | |
724 | ||
725 | void machine_shutdown(void) | |
726 | { | |
727 | machine_ops.shutdown(); | |
728 | } | |
729 | ||
730 | void machine_emergency_restart(void) | |
731 | { | |
d176720d | 732 | __machine_emergency_restart(1); |
416e2d63 JB |
733 | } |
734 | ||
735 | void machine_restart(char *cmd) | |
736 | { | |
737 | machine_ops.restart(cmd); | |
738 | } | |
739 | ||
740 | void machine_halt(void) | |
741 | { | |
742 | machine_ops.halt(); | |
743 | } | |
744 | ||
ed23dc6f GC |
745 | #ifdef CONFIG_KEXEC |
746 | void machine_crash_shutdown(struct pt_regs *regs) | |
747 | { | |
748 | machine_ops.crash_shutdown(regs); | |
749 | } | |
750 | #endif | |
2ddded21 EH |
751 | |
752 | ||
bb8dd270 | 753 | #if defined(CONFIG_SMP) |
2ddded21 EH |
754 | |
755 | /* This keeps a track of which one is crashing cpu. */ | |
756 | static int crashing_cpu; | |
757 | static nmi_shootdown_cb shootdown_callback; | |
758 | ||
759 | static atomic_t waiting_for_crash_ipi; | |
760 | ||
9c48f1c6 | 761 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
762 | { |
763 | int cpu; | |
764 | ||
2ddded21 EH |
765 | cpu = raw_smp_processor_id(); |
766 | ||
144d102b ML |
767 | /* |
768 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
769 | * Otherwise, system will completely hang. Crashing cpu can get |
770 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
771 | */ | |
772 | if (cpu == crashing_cpu) | |
9c48f1c6 | 773 | return NMI_HANDLED; |
2ddded21 EH |
774 | local_irq_disable(); |
775 | ||
9c48f1c6 | 776 | shootdown_callback(cpu, regs); |
2ddded21 EH |
777 | |
778 | atomic_dec(&waiting_for_crash_ipi); | |
779 | /* Assume hlt works */ | |
780 | halt(); | |
781 | for (;;) | |
782 | cpu_relax(); | |
783 | ||
9c48f1c6 | 784 | return NMI_HANDLED; |
2ddded21 EH |
785 | } |
786 | ||
787 | static void smp_send_nmi_allbutself(void) | |
788 | { | |
dac5f412 | 789 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
790 | } |
791 | ||
144d102b ML |
792 | /* |
793 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
794 | * |
795 | * This function can be used to halt all other CPUs on crash | |
796 | * or emergency reboot time. The function passed as parameter | |
797 | * will be called inside a NMI handler on all CPUs. | |
798 | */ | |
2ddded21 EH |
799 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
800 | { | |
801 | unsigned long msecs; | |
c415b3dc | 802 | local_irq_disable(); |
2ddded21 | 803 | |
144d102b | 804 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
805 | crashing_cpu = safe_smp_processor_id(); |
806 | ||
807 | shootdown_callback = callback; | |
808 | ||
809 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
810 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
811 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
812 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
813 | return; /* Return what? */ |
814 | /* | |
815 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
816 | * out the NMI |
817 | */ | |
818 | wmb(); | |
819 | ||
820 | smp_send_nmi_allbutself(); | |
821 | ||
822 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
823 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
824 | mdelay(1); | |
825 | msecs--; | |
826 | } | |
827 | ||
828 | /* Leave the nmi callback set */ | |
829 | } | |
bb8dd270 EH |
830 | #else /* !CONFIG_SMP */ |
831 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
832 | { | |
833 | /* No other CPUs to shoot down */ | |
834 | } | |
2ddded21 | 835 | #endif |