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 | |
5955633e ML |
43 | /* This variable is used privately to keep track of whether or not |
44 | * reboot_type is still set to its default value (i.e., reboot= hasn't | |
45 | * been set on the command line). This is needed so that we can | |
46 | * suppress DMI scanning for reboot quirks. Without it, it's | |
47 | * impossible to override a faulty reboot quirk without recompiling. | |
48 | */ | |
49 | static int reboot_default = 1; | |
50 | ||
4d022e35 | 51 | #if defined(CONFIG_X86_32) && defined(CONFIG_SMP) |
1da177e4 | 52 | static int reboot_cpu = -1; |
1da177e4 | 53 | #endif |
4d022e35 | 54 | |
d176720d EH |
55 | /* This is set if we need to go through the 'emergency' path. |
56 | * When machine_emergency_restart() is called, we may be on | |
57 | * an inconsistent state and won't be able to do a clean cleanup | |
58 | */ | |
59 | static int reboot_emergency; | |
60 | ||
14d7ca5c PA |
61 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
62 | bool port_cf9_safe = false; | |
63 | ||
64 | /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] | |
4d022e35 MB |
65 | warm Don't set the cold reboot flag |
66 | cold Set the cold reboot flag | |
67 | bios Reboot by jumping through the BIOS (only for X86_32) | |
68 | smp Reboot by executing reset on BSP or other CPU (only for X86_32) | |
69 | triple Force a triple fault (init) | |
70 | kbd Use the keyboard controller. cold reset (default) | |
71 | acpi Use the RESET_REG in the FADT | |
72 | efi Use efi reset_system runtime service | |
14d7ca5c | 73 | pci Use the so-called "PCI reset register", CF9 |
4d022e35 MB |
74 | force Avoid anything that could hang. |
75 | */ | |
1da177e4 LT |
76 | static int __init reboot_setup(char *str) |
77 | { | |
4d022e35 | 78 | for (;;) { |
5955633e ML |
79 | /* Having anything passed on the command line via |
80 | * reboot= will cause us to disable DMI checking | |
81 | * below. | |
82 | */ | |
83 | reboot_default = 0; | |
84 | ||
1da177e4 | 85 | switch (*str) { |
4d022e35 | 86 | case 'w': |
1da177e4 LT |
87 | reboot_mode = 0x1234; |
88 | break; | |
4d022e35 MB |
89 | |
90 | case 'c': | |
91 | reboot_mode = 0; | |
1da177e4 | 92 | break; |
4d022e35 MB |
93 | |
94 | #ifdef CONFIG_X86_32 | |
1da177e4 | 95 | #ifdef CONFIG_SMP |
4d022e35 | 96 | case 's': |
6f673d83 | 97 | if (isdigit(*(str+1))) { |
1da177e4 | 98 | reboot_cpu = (int) (*(str+1) - '0'); |
6f673d83 | 99 | if (isdigit(*(str+2))) |
1da177e4 LT |
100 | reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
101 | } | |
4d022e35 MB |
102 | /* we will leave sorting out the final value |
103 | when we are ready to reboot, since we might not | |
f6e9456c | 104 | have detected BSP APIC ID or smp_num_cpu */ |
1da177e4 | 105 | break; |
4d022e35 MB |
106 | #endif /* CONFIG_SMP */ |
107 | ||
108 | case 'b': | |
1da177e4 | 109 | #endif |
4d022e35 MB |
110 | case 'a': |
111 | case 'k': | |
112 | case 't': | |
113 | case 'e': | |
14d7ca5c | 114 | case 'p': |
4d022e35 MB |
115 | reboot_type = *str; |
116 | break; | |
117 | ||
118 | case 'f': | |
119 | reboot_force = 1; | |
120 | break; | |
1da177e4 | 121 | } |
4d022e35 MB |
122 | |
123 | str = strchr(str, ','); | |
124 | if (str) | |
1da177e4 LT |
125 | str++; |
126 | else | |
127 | break; | |
128 | } | |
129 | return 1; | |
130 | } | |
131 | ||
132 | __setup("reboot=", reboot_setup); | |
133 | ||
4d022e35 MB |
134 | |
135 | #ifdef CONFIG_X86_32 | |
1da177e4 LT |
136 | /* |
137 | * Reboot options and system auto-detection code provided by | |
138 | * Dell Inc. so their systems "just work". :-) | |
139 | */ | |
140 | ||
141 | /* | |
1ef03890 | 142 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 143 | * this quirk makes that automatic. |
1da177e4 | 144 | */ |
1855256c | 145 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 146 | { |
4d022e35 MB |
147 | if (reboot_type != BOOT_BIOS) { |
148 | reboot_type = BOOT_BIOS; | |
1da177e4 LT |
149 | printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
1ef03890 PC |
154 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
155 | { | |
156 | if (reboot_type != BOOT_KBD) { | |
157 | reboot_type = BOOT_KBD; | |
158 | printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident); | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
1da177e4 | 163 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
b9e82af8 TG |
164 | { /* Handle problems with rebooting on Dell E520's */ |
165 | .callback = set_bios_reboot, | |
166 | .ident = "Dell E520", | |
167 | .matches = { | |
168 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
169 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), | |
170 | }, | |
171 | }, | |
1da177e4 | 172 | { /* Handle problems with rebooting on Dell 1300's */ |
dd2a1305 | 173 | .callback = set_bios_reboot, |
1da177e4 LT |
174 | .ident = "Dell PowerEdge 1300", |
175 | .matches = { | |
176 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
177 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
178 | }, | |
179 | }, | |
180 | { /* Handle problems with rebooting on Dell 300's */ | |
181 | .callback = set_bios_reboot, | |
182 | .ident = "Dell PowerEdge 300", | |
183 | .matches = { | |
184 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
185 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
186 | }, | |
187 | }, | |
df2edcf3 JJ |
188 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/ |
189 | .callback = set_bios_reboot, | |
190 | .ident = "Dell OptiPlex 745", | |
191 | .matches = { | |
192 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
193 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
df2edcf3 JJ |
194 | }, |
195 | }, | |
fc115bf1 CK |
196 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/ |
197 | .callback = set_bios_reboot, | |
198 | .ident = "Dell OptiPlex 745", | |
199 | .matches = { | |
200 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
201 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
202 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
203 | }, | |
204 | }, | |
fc1c8925 HAA |
205 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
206 | .callback = set_bios_reboot, | |
207 | .ident = "Dell OptiPlex 745", | |
208 | .matches = { | |
209 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
210 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
211 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
212 | }, | |
213 | }, | |
093bac15 SC |
214 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
215 | .callback = set_bios_reboot, | |
216 | .ident = "Dell OptiPlex 330", | |
217 | .matches = { | |
218 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
219 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), | |
220 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
221 | }, | |
222 | }, | |
4a4aca64 JD |
223 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
224 | .callback = set_bios_reboot, | |
225 | .ident = "Dell OptiPlex 360", | |
226 | .matches = { | |
227 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
228 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), | |
229 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
230 | }, | |
231 | }, | |
35ea63d7 LO |
232 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/ |
233 | .callback = set_bios_reboot, | |
234 | .ident = "Dell OptiPlex 760", | |
235 | .matches = { | |
236 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
237 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
238 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
239 | }, | |
240 | }, | |
1da177e4 LT |
241 | { /* Handle problems with rebooting on Dell 2400's */ |
242 | .callback = set_bios_reboot, | |
243 | .ident = "Dell PowerEdge 2400", | |
244 | .matches = { | |
245 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
246 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
247 | }, | |
248 | }, | |
fab3b58d IM |
249 | { /* Handle problems with rebooting on Dell T5400's */ |
250 | .callback = set_bios_reboot, | |
251 | .ident = "Dell Precision T5400", | |
252 | .matches = { | |
253 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
254 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), | |
255 | }, | |
256 | }, | |
890ffedc TB |
257 | { /* Handle problems with rebooting on Dell T7400's */ |
258 | .callback = set_bios_reboot, | |
259 | .ident = "Dell Precision T7400", | |
260 | .matches = { | |
261 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
262 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), | |
263 | }, | |
264 | }, | |
766c3f94 | 265 | { /* Handle problems with rebooting on HP laptops */ |
d91b14c4 | 266 | .callback = set_bios_reboot, |
766c3f94 | 267 | .ident = "HP Compaq Laptop", |
d91b14c4 TV |
268 | .matches = { |
269 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
766c3f94 | 270 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
d91b14c4 TV |
271 | }, |
272 | }, | |
dd4124a8 LO |
273 | { /* Handle problems with rebooting on Dell XPS710 */ |
274 | .callback = set_bios_reboot, | |
275 | .ident = "Dell XPS710", | |
276 | .matches = { | |
277 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
278 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), | |
279 | }, | |
280 | }, | |
c5da9a2b AC |
281 | { /* Handle problems with rebooting on Dell DXP061 */ |
282 | .callback = set_bios_reboot, | |
283 | .ident = "Dell DXP061", | |
284 | .matches = { | |
285 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
286 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), | |
287 | }, | |
288 | }, | |
88dff493 ZR |
289 | { /* Handle problems with rebooting on Sony VGN-Z540N */ |
290 | .callback = set_bios_reboot, | |
291 | .ident = "Sony VGN-Z540N", | |
292 | .matches = { | |
293 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
294 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
295 | }, | |
296 | }, | |
77f32dfd DT |
297 | { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */ |
298 | .callback = set_bios_reboot, | |
299 | .ident = "CompuLab SBC-FITPC2", | |
300 | .matches = { | |
301 | DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"), | |
302 | DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"), | |
303 | }, | |
304 | }, | |
4832ddda LO |
305 | { /* Handle problems with rebooting on ASUS P4S800 */ |
306 | .callback = set_bios_reboot, | |
307 | .ident = "ASUS P4S800", | |
308 | .matches = { | |
309 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
310 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
311 | }, | |
312 | }, | |
b49c78d4 | 313 | { /* Handle reboot issue on Acer Aspire one */ |
1ef03890 | 314 | .callback = set_kbd_reboot, |
b49c78d4 PC |
315 | .ident = "Acer Aspire One A110", |
316 | .matches = { | |
317 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
318 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
319 | }, | |
320 | }, | |
1da177e4 LT |
321 | { } |
322 | }; | |
323 | ||
324 | static int __init reboot_init(void) | |
325 | { | |
5955633e ML |
326 | /* Only do the DMI check if reboot_type hasn't been overridden |
327 | * on the command line | |
328 | */ | |
329 | if (reboot_default) { | |
330 | dmi_check_system(reboot_dmi_table); | |
331 | } | |
1da177e4 LT |
332 | return 0; |
333 | } | |
1da177e4 LT |
334 | core_initcall(reboot_init); |
335 | ||
3d35ac34 | 336 | void machine_real_restart(unsigned int type) |
1da177e4 | 337 | { |
5a8c9aeb | 338 | void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int)) |
b429dbf6 | 339 | real_mode_header->machine_real_restart_asm; |
1da177e4 | 340 | |
1da177e4 LT |
341 | local_irq_disable(); |
342 | ||
343 | /* Write zero to CMOS register number 0x0f, which the BIOS POST | |
344 | routine will recognize as telling it to do a proper reboot. (Well | |
345 | that's what this book in front of me says -- it may only apply to | |
346 | the Phoenix BIOS though, it's not clear). At the same time, | |
347 | disable NMIs by setting the top bit in the CMOS address register, | |
348 | as we're about to do peculiar things to the CPU. I'm not sure if | |
349 | `outb_p' is needed instead of just `outb'. Use it to be on the | |
350 | safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
351 | */ | |
62dbc210 | 352 | spin_lock(&rtc_lock); |
1da177e4 | 353 | CMOS_WRITE(0x00, 0x8f); |
62dbc210 | 354 | spin_unlock(&rtc_lock); |
1da177e4 | 355 | |
1da177e4 | 356 | /* |
b40827fa | 357 | * Switch back to the initial page table. |
1da177e4 | 358 | */ |
b40827fa | 359 | load_cr3(initial_page_table); |
1da177e4 LT |
360 | |
361 | /* Write 0x1234 to absolute memory location 0x472. The BIOS reads | |
362 | this on booting to tell it to "Bypass memory test (also warm | |
363 | boot)". This seems like a fairly standard thing that gets set by | |
364 | REBOOT.COM programs, and the previous reset routine did this | |
365 | too. */ | |
1da177e4 LT |
366 | *((unsigned short *)0x472) = reboot_mode; |
367 | ||
3d35ac34 PA |
368 | /* Jump to the identity-mapped low memory code */ |
369 | restart_lowmem(type); | |
1da177e4 | 370 | } |
129f6946 AD |
371 | #ifdef CONFIG_APM_MODULE |
372 | EXPORT_SYMBOL(machine_real_restart); | |
373 | #endif | |
1da177e4 | 374 | |
4d022e35 MB |
375 | #endif /* CONFIG_X86_32 */ |
376 | ||
6c6c51e4 | 377 | /* |
498cdbfb | 378 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot |
6c6c51e4 PM |
379 | */ |
380 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
381 | { | |
382 | if (reboot_type != BOOT_CF9) { | |
383 | reboot_type = BOOT_CF9; | |
384 | printk(KERN_INFO "%s series board detected. " | |
385 | "Selecting PCI-method for reboots.\n", d->ident); | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static struct dmi_system_id __initdata pci_reboot_dmi_table[] = { | |
3e03bbea | 391 | { /* Handle problems with rebooting on Apple MacBook5 */ |
6c6c51e4 | 392 | .callback = set_pci_reboot, |
3e03bbea | 393 | .ident = "Apple MacBook5", |
6c6c51e4 PM |
394 | .matches = { |
395 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 396 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), |
6c6c51e4 PM |
397 | }, |
398 | }, | |
3e03bbea | 399 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
498cdbfb | 400 | .callback = set_pci_reboot, |
3e03bbea | 401 | .ident = "Apple MacBookPro5", |
498cdbfb OÇ |
402 | .matches = { |
403 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
3e03bbea | 404 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), |
498cdbfb OÇ |
405 | }, |
406 | }, | |
05154752 GH |
407 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
408 | .callback = set_pci_reboot, | |
409 | .ident = "Apple Macmini3,1", | |
410 | .matches = { | |
411 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
412 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
413 | }, | |
414 | }, | |
0a832320 JM |
415 | { /* Handle problems with rebooting on the iMac9,1. */ |
416 | .callback = set_pci_reboot, | |
417 | .ident = "Apple iMac9,1", | |
418 | .matches = { | |
419 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
420 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
421 | }, | |
422 | }, | |
3628c3f5 MR |
423 | { /* Handle problems with rebooting on the Latitude E6320. */ |
424 | .callback = set_pci_reboot, | |
425 | .ident = "Dell Latitude E6320", | |
426 | .matches = { | |
427 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
428 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), | |
429 | }, | |
430 | }, | |
b7798d28 DB |
431 | { /* Handle problems with rebooting on the Latitude E5420. */ |
432 | .callback = set_pci_reboot, | |
433 | .ident = "Dell Latitude E5420", | |
434 | .matches = { | |
435 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
436 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), | |
437 | }, | |
438 | }, | |
a536877e PA |
439 | { /* Handle problems with rebooting on the Latitude E6420. */ |
440 | .callback = set_pci_reboot, | |
441 | .ident = "Dell Latitude E6420", | |
442 | .matches = { | |
443 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
444 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), | |
445 | }, | |
446 | }, | |
6be30bb7 RW |
447 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
448 | .callback = set_pci_reboot, | |
449 | .ident = "Dell OptiPlex 990", | |
450 | .matches = { | |
451 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
452 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
453 | }, | |
454 | }, | |
6c6c51e4 PM |
455 | { } |
456 | }; | |
457 | ||
458 | static int __init pci_reboot_init(void) | |
459 | { | |
5955633e ML |
460 | /* Only do the DMI check if reboot_type hasn't been overridden |
461 | * on the command line | |
462 | */ | |
463 | if (reboot_default) { | |
464 | dmi_check_system(pci_reboot_dmi_table); | |
465 | } | |
6c6c51e4 PM |
466 | return 0; |
467 | } | |
468 | core_initcall(pci_reboot_init); | |
469 | ||
4d022e35 MB |
470 | static inline void kb_wait(void) |
471 | { | |
472 | int i; | |
473 | ||
c84d6af8 AC |
474 | for (i = 0; i < 0x10000; i++) { |
475 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 476 | break; |
c84d6af8 AC |
477 | udelay(2); |
478 | } | |
4d022e35 MB |
479 | } |
480 | ||
9c48f1c6 | 481 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
482 | { |
483 | cpu_emergency_vmxoff(); | |
484 | } | |
485 | ||
486 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization | |
487 | */ | |
488 | static void emergency_vmx_disable_all(void) | |
489 | { | |
490 | /* Just make sure we won't change CPUs while doing this */ | |
491 | local_irq_disable(); | |
492 | ||
493 | /* We need to disable VMX on all CPUs before rebooting, otherwise | |
494 | * we risk hanging up the machine, because the CPU ignore INIT | |
495 | * signals when VMX is enabled. | |
496 | * | |
497 | * We can't take any locks and we may be on an inconsistent | |
498 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
499 | * VMX and halt. | |
500 | * | |
501 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
502 | * stuff unnecessarily, but we don't have a way to check | |
503 | * if other CPUs have VMX enabled. So we will call it only if the | |
504 | * CPU we are running on has VMX enabled. | |
505 | * | |
506 | * We will miss cases where VMX is not enabled on all CPUs. This | |
507 | * shouldn't do much harm because KVM always enable VMX on all | |
508 | * CPUs anyway. But we can miss it on the small window where KVM | |
509 | * is still enabling VMX. | |
510 | */ | |
511 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
512 | /* Disable VMX on this CPU. | |
513 | */ | |
514 | cpu_vmxoff(); | |
515 | ||
516 | /* Halt and disable VMX on the other CPUs */ | |
517 | nmi_shootdown_cpus(vmxoff_nmi); | |
518 | ||
519 | } | |
520 | } | |
521 | ||
522 | ||
7432d149 IM |
523 | void __attribute__((weak)) mach_reboot_fixups(void) |
524 | { | |
525 | } | |
526 | ||
660e34ce MG |
527 | /* |
528 | * Windows compatible x86 hardware expects the following on reboot: | |
529 | * | |
530 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
531 | * 2) If still alive, write to the keyboard controller | |
532 | * 3) If still alive, write to the ACPI reboot register again | |
533 | * 4) If still alive, write to the keyboard controller again | |
534 | * | |
535 | * If the machine is still alive at this stage, it gives up. We default to | |
536 | * following the same pattern, except that if we're still alive after (4) we'll | |
537 | * try to force a triple fault and then cycle between hitting the keyboard | |
538 | * controller and doing that | |
539 | */ | |
416e2d63 | 540 | static void native_machine_emergency_restart(void) |
1da177e4 | 541 | { |
4d022e35 | 542 | int i; |
660e34ce MG |
543 | int attempt = 0; |
544 | int orig_reboot_type = reboot_type; | |
4d022e35 | 545 | |
d176720d EH |
546 | if (reboot_emergency) |
547 | emergency_vmx_disable_all(); | |
548 | ||
840c2baf JC |
549 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
550 | ||
4d022e35 MB |
551 | /* Tell the BIOS if we want cold or warm reboot */ |
552 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
553 | ||
554 | for (;;) { | |
555 | /* Could also try the reset bit in the Hammer NB */ | |
556 | switch (reboot_type) { | |
557 | case BOOT_KBD: | |
7432d149 IM |
558 | mach_reboot_fixups(); /* for board specific fixups */ |
559 | ||
4d022e35 MB |
560 | for (i = 0; i < 10; i++) { |
561 | kb_wait(); | |
562 | udelay(50); | |
563 | outb(0xfe, 0x64); /* pulse reset low */ | |
564 | udelay(50); | |
565 | } | |
660e34ce MG |
566 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
567 | attempt = 1; | |
568 | reboot_type = BOOT_ACPI; | |
569 | } else { | |
570 | reboot_type = BOOT_TRIPLE; | |
571 | } | |
572 | break; | |
4d022e35 MB |
573 | |
574 | case BOOT_TRIPLE: | |
ebdd561a | 575 | load_idt(&no_idt); |
4d022e35 MB |
576 | __asm__ __volatile__("int3"); |
577 | ||
578 | reboot_type = BOOT_KBD; | |
579 | break; | |
580 | ||
581 | #ifdef CONFIG_X86_32 | |
582 | case BOOT_BIOS: | |
3d35ac34 | 583 | machine_real_restart(MRR_BIOS); |
4d022e35 MB |
584 | |
585 | reboot_type = BOOT_KBD; | |
586 | break; | |
587 | #endif | |
588 | ||
589 | case BOOT_ACPI: | |
590 | acpi_reboot(); | |
591 | reboot_type = BOOT_KBD; | |
592 | break; | |
593 | ||
4d022e35 MB |
594 | case BOOT_EFI: |
595 | if (efi_enabled) | |
14d7ca5c PA |
596 | efi.reset_system(reboot_mode ? |
597 | EFI_RESET_WARM : | |
598 | EFI_RESET_COLD, | |
4d022e35 | 599 | EFI_SUCCESS, 0, NULL); |
b47b9288 | 600 | reboot_type = BOOT_KBD; |
14d7ca5c | 601 | break; |
4d022e35 | 602 | |
14d7ca5c PA |
603 | case BOOT_CF9: |
604 | port_cf9_safe = true; | |
605 | /* fall through */ | |
4d022e35 | 606 | |
14d7ca5c PA |
607 | case BOOT_CF9_COND: |
608 | if (port_cf9_safe) { | |
609 | u8 cf9 = inb(0xcf9) & ~6; | |
610 | outb(cf9|2, 0xcf9); /* Request hard reset */ | |
611 | udelay(50); | |
612 | outb(cf9|6, 0xcf9); /* Actually do the reset */ | |
613 | udelay(50); | |
614 | } | |
4d022e35 MB |
615 | reboot_type = BOOT_KBD; |
616 | break; | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
3c62c625 | 621 | void native_machine_shutdown(void) |
4d022e35 MB |
622 | { |
623 | /* Stop the cpus and apics */ | |
1da177e4 | 624 | #ifdef CONFIG_SMP |
dd2a1305 EB |
625 | |
626 | /* The boot cpu is always logical cpu 0 */ | |
65c01184 | 627 | int reboot_cpu_id = 0; |
dd2a1305 | 628 | |
4d022e35 | 629 | #ifdef CONFIG_X86_32 |
dd2a1305 | 630 | /* See if there has been given a command line override */ |
9628937d | 631 | if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) && |
0bc3cc03 | 632 | cpu_online(reboot_cpu)) |
dd2a1305 | 633 | reboot_cpu_id = reboot_cpu; |
4d022e35 | 634 | #endif |
1da177e4 | 635 | |
4d022e35 | 636 | /* Make certain the cpu I'm about to reboot on is online */ |
0bc3cc03 | 637 | if (!cpu_online(reboot_cpu_id)) |
dd2a1305 | 638 | reboot_cpu_id = smp_processor_id(); |
dd2a1305 EB |
639 | |
640 | /* Make certain I only run on the appropriate processor */ | |
9628937d | 641 | set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); |
dd2a1305 | 642 | |
4d022e35 MB |
643 | /* O.K Now that I'm on the appropriate processor, |
644 | * stop all of the others. | |
1da177e4 | 645 | */ |
76fac077 | 646 | stop_other_cpus(); |
4d022e35 | 647 | #endif |
1da177e4 LT |
648 | |
649 | lapic_shutdown(); | |
650 | ||
651 | #ifdef CONFIG_X86_IO_APIC | |
652 | disable_IO_APIC(); | |
653 | #endif | |
4d022e35 | 654 | |
c86c7fbc OH |
655 | #ifdef CONFIG_HPET_TIMER |
656 | hpet_disable(); | |
657 | #endif | |
dd2a1305 | 658 | |
4d022e35 | 659 | #ifdef CONFIG_X86_64 |
338bac52 | 660 | x86_platform.iommu_shutdown(); |
4d022e35 | 661 | #endif |
973efae2 JF |
662 | } |
663 | ||
d176720d EH |
664 | static void __machine_emergency_restart(int emergency) |
665 | { | |
666 | reboot_emergency = emergency; | |
667 | machine_ops.emergency_restart(); | |
668 | } | |
669 | ||
416e2d63 | 670 | static void native_machine_restart(char *__unused) |
dd2a1305 | 671 | { |
4d022e35 | 672 | printk("machine restart\n"); |
1da177e4 | 673 | |
4d022e35 MB |
674 | if (!reboot_force) |
675 | machine_shutdown(); | |
d176720d | 676 | __machine_emergency_restart(0); |
4a1421f8 EB |
677 | } |
678 | ||
416e2d63 | 679 | static void native_machine_halt(void) |
1da177e4 | 680 | { |
d3ec5cae IV |
681 | /* stop other cpus and apics */ |
682 | machine_shutdown(); | |
683 | ||
840c2baf JC |
684 | tboot_shutdown(TB_SHUTDOWN_HALT); |
685 | ||
d3ec5cae IV |
686 | /* stop this cpu */ |
687 | stop_this_cpu(NULL); | |
1da177e4 LT |
688 | } |
689 | ||
416e2d63 | 690 | static void native_machine_power_off(void) |
1da177e4 | 691 | { |
6e3fbee5 | 692 | if (pm_power_off) { |
4d022e35 MB |
693 | if (!reboot_force) |
694 | machine_shutdown(); | |
1da177e4 | 695 | pm_power_off(); |
6e3fbee5 | 696 | } |
840c2baf JC |
697 | /* a fallback in case there is no PM info available */ |
698 | tboot_shutdown(TB_SHUTDOWN_HALT); | |
1da177e4 LT |
699 | } |
700 | ||
07f3331c | 701 | struct machine_ops machine_ops = { |
416e2d63 JB |
702 | .power_off = native_machine_power_off, |
703 | .shutdown = native_machine_shutdown, | |
704 | .emergency_restart = native_machine_emergency_restart, | |
705 | .restart = native_machine_restart, | |
ed23dc6f GC |
706 | .halt = native_machine_halt, |
707 | #ifdef CONFIG_KEXEC | |
708 | .crash_shutdown = native_machine_crash_shutdown, | |
709 | #endif | |
07f3331c | 710 | }; |
416e2d63 JB |
711 | |
712 | void machine_power_off(void) | |
713 | { | |
714 | machine_ops.power_off(); | |
715 | } | |
716 | ||
717 | void machine_shutdown(void) | |
718 | { | |
719 | machine_ops.shutdown(); | |
720 | } | |
721 | ||
722 | void machine_emergency_restart(void) | |
723 | { | |
d176720d | 724 | __machine_emergency_restart(1); |
416e2d63 JB |
725 | } |
726 | ||
727 | void machine_restart(char *cmd) | |
728 | { | |
729 | machine_ops.restart(cmd); | |
730 | } | |
731 | ||
732 | void machine_halt(void) | |
733 | { | |
734 | machine_ops.halt(); | |
735 | } | |
736 | ||
ed23dc6f GC |
737 | #ifdef CONFIG_KEXEC |
738 | void machine_crash_shutdown(struct pt_regs *regs) | |
739 | { | |
740 | machine_ops.crash_shutdown(regs); | |
741 | } | |
742 | #endif | |
2ddded21 EH |
743 | |
744 | ||
bb8dd270 | 745 | #if defined(CONFIG_SMP) |
2ddded21 EH |
746 | |
747 | /* This keeps a track of which one is crashing cpu. */ | |
748 | static int crashing_cpu; | |
749 | static nmi_shootdown_cb shootdown_callback; | |
750 | ||
751 | static atomic_t waiting_for_crash_ipi; | |
752 | ||
9c48f1c6 | 753 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
754 | { |
755 | int cpu; | |
756 | ||
2ddded21 EH |
757 | cpu = raw_smp_processor_id(); |
758 | ||
759 | /* Don't do anything if this handler is invoked on crashing cpu. | |
760 | * Otherwise, system will completely hang. Crashing cpu can get | |
761 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
762 | */ | |
763 | if (cpu == crashing_cpu) | |
9c48f1c6 | 764 | return NMI_HANDLED; |
2ddded21 EH |
765 | local_irq_disable(); |
766 | ||
9c48f1c6 | 767 | shootdown_callback(cpu, regs); |
2ddded21 EH |
768 | |
769 | atomic_dec(&waiting_for_crash_ipi); | |
770 | /* Assume hlt works */ | |
771 | halt(); | |
772 | for (;;) | |
773 | cpu_relax(); | |
774 | ||
9c48f1c6 | 775 | return NMI_HANDLED; |
2ddded21 EH |
776 | } |
777 | ||
778 | static void smp_send_nmi_allbutself(void) | |
779 | { | |
dac5f412 | 780 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
781 | } |
782 | ||
bb8dd270 EH |
783 | /* Halt all other CPUs, calling the specified function on each of them |
784 | * | |
785 | * This function can be used to halt all other CPUs on crash | |
786 | * or emergency reboot time. The function passed as parameter | |
787 | * will be called inside a NMI handler on all CPUs. | |
788 | */ | |
2ddded21 EH |
789 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
790 | { | |
791 | unsigned long msecs; | |
c415b3dc | 792 | local_irq_disable(); |
2ddded21 EH |
793 | |
794 | /* Make a note of crashing cpu. Will be used in NMI callback.*/ | |
795 | crashing_cpu = safe_smp_processor_id(); | |
796 | ||
797 | shootdown_callback = callback; | |
798 | ||
799 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
800 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
801 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
802 | NMI_FLAG_FIRST, "crash")) | |
2ddded21 EH |
803 | return; /* return what? */ |
804 | /* Ensure the new callback function is set before sending | |
805 | * out the NMI | |
806 | */ | |
807 | wmb(); | |
808 | ||
809 | smp_send_nmi_allbutself(); | |
810 | ||
811 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
812 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
813 | mdelay(1); | |
814 | msecs--; | |
815 | } | |
816 | ||
817 | /* Leave the nmi callback set */ | |
818 | } | |
bb8dd270 EH |
819 | #else /* !CONFIG_SMP */ |
820 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
821 | { | |
822 | /* No other CPUs to shoot down */ | |
823 | } | |
2ddded21 | 824 | #endif |