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> | |
4d022e35 | 27 | #else |
338bac52 | 28 | # include <asm/x86_init.h> |
4d022e35 MB |
29 | #endif |
30 | ||
1da177e4 LT |
31 | /* |
32 | * Power off function, if any | |
33 | */ | |
34 | void (*pm_power_off)(void); | |
129f6946 | 35 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 | 36 | |
ebdd561a | 37 | static const struct desc_ptr no_idt = {}; |
1da177e4 | 38 | static int reboot_mode; |
660e34ce | 39 | enum reboot_type reboot_type = BOOT_ACPI; |
4d022e35 | 40 | int reboot_force; |
1da177e4 | 41 | |
4d022e35 | 42 | #if defined(CONFIG_X86_32) && defined(CONFIG_SMP) |
1da177e4 | 43 | static int reboot_cpu = -1; |
1da177e4 | 44 | #endif |
4d022e35 | 45 | |
d176720d EH |
46 | /* This is set if we need to go through the 'emergency' path. |
47 | * When machine_emergency_restart() is called, we may be on | |
48 | * an inconsistent state and won't be able to do a clean cleanup | |
49 | */ | |
50 | static int reboot_emergency; | |
51 | ||
14d7ca5c PA |
52 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
53 | bool port_cf9_safe = false; | |
54 | ||
55 | /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] | |
4d022e35 MB |
56 | warm Don't set the cold reboot flag |
57 | cold Set the cold reboot flag | |
58 | bios Reboot by jumping through the BIOS (only for X86_32) | |
59 | smp Reboot by executing reset on BSP or other CPU (only for X86_32) | |
60 | triple Force a triple fault (init) | |
61 | kbd Use the keyboard controller. cold reset (default) | |
62 | acpi Use the RESET_REG in the FADT | |
63 | efi Use efi reset_system runtime service | |
14d7ca5c | 64 | pci Use the so-called "PCI reset register", CF9 |
4d022e35 MB |
65 | force Avoid anything that could hang. |
66 | */ | |
1da177e4 LT |
67 | static int __init reboot_setup(char *str) |
68 | { | |
4d022e35 | 69 | for (;;) { |
1da177e4 | 70 | switch (*str) { |
4d022e35 | 71 | case 'w': |
1da177e4 LT |
72 | reboot_mode = 0x1234; |
73 | break; | |
4d022e35 MB |
74 | |
75 | case 'c': | |
76 | reboot_mode = 0; | |
1da177e4 | 77 | break; |
4d022e35 MB |
78 | |
79 | #ifdef CONFIG_X86_32 | |
1da177e4 | 80 | #ifdef CONFIG_SMP |
4d022e35 | 81 | case 's': |
6f673d83 | 82 | if (isdigit(*(str+1))) { |
1da177e4 | 83 | reboot_cpu = (int) (*(str+1) - '0'); |
6f673d83 | 84 | if (isdigit(*(str+2))) |
1da177e4 LT |
85 | reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
86 | } | |
4d022e35 MB |
87 | /* we will leave sorting out the final value |
88 | when we are ready to reboot, since we might not | |
f6e9456c | 89 | have detected BSP APIC ID or smp_num_cpu */ |
1da177e4 | 90 | break; |
4d022e35 MB |
91 | #endif /* CONFIG_SMP */ |
92 | ||
93 | case 'b': | |
1da177e4 | 94 | #endif |
4d022e35 MB |
95 | case 'a': |
96 | case 'k': | |
97 | case 't': | |
98 | case 'e': | |
14d7ca5c | 99 | case 'p': |
4d022e35 MB |
100 | reboot_type = *str; |
101 | break; | |
102 | ||
103 | case 'f': | |
104 | reboot_force = 1; | |
105 | break; | |
1da177e4 | 106 | } |
4d022e35 MB |
107 | |
108 | str = strchr(str, ','); | |
109 | if (str) | |
1da177e4 LT |
110 | str++; |
111 | else | |
112 | break; | |
113 | } | |
114 | return 1; | |
115 | } | |
116 | ||
117 | __setup("reboot=", reboot_setup); | |
118 | ||
4d022e35 MB |
119 | |
120 | #ifdef CONFIG_X86_32 | |
1da177e4 LT |
121 | /* |
122 | * Reboot options and system auto-detection code provided by | |
123 | * Dell Inc. so their systems "just work". :-) | |
124 | */ | |
125 | ||
126 | /* | |
4d022e35 MB |
127 | * Some machines require the "reboot=b" commandline option, |
128 | * this quirk makes that automatic. | |
1da177e4 | 129 | */ |
1855256c | 130 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 131 | { |
4d022e35 MB |
132 | if (reboot_type != BOOT_BIOS) { |
133 | reboot_type = BOOT_BIOS; | |
1da177e4 LT |
134 | printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); |
135 | } | |
136 | return 0; | |
137 | } | |
138 | ||
1da177e4 | 139 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
b9e82af8 TG |
140 | { /* Handle problems with rebooting on Dell E520's */ |
141 | .callback = set_bios_reboot, | |
142 | .ident = "Dell E520", | |
143 | .matches = { | |
144 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
145 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), | |
146 | }, | |
147 | }, | |
1da177e4 | 148 | { /* Handle problems with rebooting on Dell 1300's */ |
dd2a1305 | 149 | .callback = set_bios_reboot, |
1da177e4 LT |
150 | .ident = "Dell PowerEdge 1300", |
151 | .matches = { | |
152 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
153 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
154 | }, | |
155 | }, | |
156 | { /* Handle problems with rebooting on Dell 300's */ | |
157 | .callback = set_bios_reboot, | |
158 | .ident = "Dell PowerEdge 300", | |
159 | .matches = { | |
160 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
161 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
162 | }, | |
163 | }, | |
df2edcf3 JJ |
164 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/ |
165 | .callback = set_bios_reboot, | |
166 | .ident = "Dell OptiPlex 745", | |
167 | .matches = { | |
168 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
169 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
df2edcf3 JJ |
170 | }, |
171 | }, | |
fc115bf1 CK |
172 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/ |
173 | .callback = set_bios_reboot, | |
174 | .ident = "Dell OptiPlex 745", | |
175 | .matches = { | |
176 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
177 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
178 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
179 | }, | |
180 | }, | |
fc1c8925 HAA |
181 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
182 | .callback = set_bios_reboot, | |
183 | .ident = "Dell OptiPlex 745", | |
184 | .matches = { | |
185 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
186 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
187 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
188 | }, | |
189 | }, | |
093bac15 SC |
190 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
191 | .callback = set_bios_reboot, | |
192 | .ident = "Dell OptiPlex 330", | |
193 | .matches = { | |
194 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
195 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), | |
196 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
197 | }, | |
198 | }, | |
4a4aca64 JD |
199 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
200 | .callback = set_bios_reboot, | |
201 | .ident = "Dell OptiPlex 360", | |
202 | .matches = { | |
203 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
204 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), | |
205 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
206 | }, | |
207 | }, | |
35ea63d7 LO |
208 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/ |
209 | .callback = set_bios_reboot, | |
210 | .ident = "Dell OptiPlex 760", | |
211 | .matches = { | |
212 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
213 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
214 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
215 | }, | |
216 | }, | |
1da177e4 LT |
217 | { /* Handle problems with rebooting on Dell 2400's */ |
218 | .callback = set_bios_reboot, | |
219 | .ident = "Dell PowerEdge 2400", | |
220 | .matches = { | |
221 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
222 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
223 | }, | |
224 | }, | |
fab3b58d IM |
225 | { /* Handle problems with rebooting on Dell T5400's */ |
226 | .callback = set_bios_reboot, | |
227 | .ident = "Dell Precision T5400", | |
228 | .matches = { | |
229 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
230 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), | |
231 | }, | |
232 | }, | |
890ffedc TB |
233 | { /* Handle problems with rebooting on Dell T7400's */ |
234 | .callback = set_bios_reboot, | |
235 | .ident = "Dell Precision T7400", | |
236 | .matches = { | |
237 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
238 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), | |
239 | }, | |
240 | }, | |
766c3f94 | 241 | { /* Handle problems with rebooting on HP laptops */ |
d91b14c4 | 242 | .callback = set_bios_reboot, |
766c3f94 | 243 | .ident = "HP Compaq Laptop", |
d91b14c4 TV |
244 | .matches = { |
245 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
766c3f94 | 246 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
d91b14c4 TV |
247 | }, |
248 | }, | |
dd4124a8 LO |
249 | { /* Handle problems with rebooting on Dell XPS710 */ |
250 | .callback = set_bios_reboot, | |
251 | .ident = "Dell XPS710", | |
252 | .matches = { | |
253 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
254 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), | |
255 | }, | |
256 | }, | |
c5da9a2b AC |
257 | { /* Handle problems with rebooting on Dell DXP061 */ |
258 | .callback = set_bios_reboot, | |
259 | .ident = "Dell DXP061", | |
260 | .matches = { | |
261 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
262 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), | |
263 | }, | |
264 | }, | |
88dff493 ZR |
265 | { /* Handle problems with rebooting on Sony VGN-Z540N */ |
266 | .callback = set_bios_reboot, | |
267 | .ident = "Sony VGN-Z540N", | |
268 | .matches = { | |
269 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
270 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
271 | }, | |
272 | }, | |
77f32dfd DT |
273 | { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */ |
274 | .callback = set_bios_reboot, | |
275 | .ident = "CompuLab SBC-FITPC2", | |
276 | .matches = { | |
277 | DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"), | |
278 | DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"), | |
279 | }, | |
280 | }, | |
4832ddda LO |
281 | { /* Handle problems with rebooting on ASUS P4S800 */ |
282 | .callback = set_bios_reboot, | |
283 | .ident = "ASUS P4S800", | |
284 | .matches = { | |
285 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
286 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
287 | }, | |
288 | }, | |
e19e074b KK |
289 | { /* Handle problems with rebooting on VersaLogic Menlow boards */ |
290 | .callback = set_bios_reboot, | |
291 | .ident = "VersaLogic Menlow based board", | |
292 | .matches = { | |
293 | DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"), | |
294 | DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"), | |
295 | }, | |
296 | }, | |
b49c78d4 PC |
297 | { /* Handle reboot issue on Acer Aspire one */ |
298 | .callback = set_bios_reboot, | |
299 | .ident = "Acer Aspire One A110", | |
300 | .matches = { | |
301 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
302 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
303 | }, | |
304 | }, | |
1da177e4 LT |
305 | { } |
306 | }; | |
307 | ||
308 | static int __init reboot_init(void) | |
309 | { | |
310 | dmi_check_system(reboot_dmi_table); | |
311 | return 0; | |
312 | } | |
1da177e4 LT |
313 | core_initcall(reboot_init); |
314 | ||
3d35ac34 PA |
315 | extern const unsigned char machine_real_restart_asm[]; |
316 | extern const u64 machine_real_restart_gdt[3]; | |
1da177e4 | 317 | |
3d35ac34 | 318 | void machine_real_restart(unsigned int type) |
1da177e4 | 319 | { |
3d35ac34 PA |
320 | void *restart_va; |
321 | unsigned long restart_pa; | |
322 | void (*restart_lowmem)(unsigned int); | |
323 | u64 *lowmem_gdt; | |
1da177e4 | 324 | |
1da177e4 LT |
325 | local_irq_disable(); |
326 | ||
327 | /* Write zero to CMOS register number 0x0f, which the BIOS POST | |
328 | routine will recognize as telling it to do a proper reboot. (Well | |
329 | that's what this book in front of me says -- it may only apply to | |
330 | the Phoenix BIOS though, it's not clear). At the same time, | |
331 | disable NMIs by setting the top bit in the CMOS address register, | |
332 | as we're about to do peculiar things to the CPU. I'm not sure if | |
333 | `outb_p' is needed instead of just `outb'. Use it to be on the | |
334 | safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
335 | */ | |
62dbc210 | 336 | spin_lock(&rtc_lock); |
1da177e4 | 337 | CMOS_WRITE(0x00, 0x8f); |
62dbc210 | 338 | spin_unlock(&rtc_lock); |
1da177e4 | 339 | |
1da177e4 | 340 | /* |
b40827fa | 341 | * Switch back to the initial page table. |
1da177e4 | 342 | */ |
b40827fa | 343 | load_cr3(initial_page_table); |
1da177e4 LT |
344 | |
345 | /* Write 0x1234 to absolute memory location 0x472. The BIOS reads | |
346 | this on booting to tell it to "Bypass memory test (also warm | |
347 | boot)". This seems like a fairly standard thing that gets set by | |
348 | REBOOT.COM programs, and the previous reset routine did this | |
349 | too. */ | |
1da177e4 LT |
350 | *((unsigned short *)0x472) = reboot_mode; |
351 | ||
3d35ac34 PA |
352 | /* Patch the GDT in the low memory trampoline */ |
353 | lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt); | |
354 | ||
355 | restart_va = TRAMPOLINE_SYM(machine_real_restart_asm); | |
356 | restart_pa = virt_to_phys(restart_va); | |
357 | restart_lowmem = (void (*)(unsigned int))restart_pa; | |
358 | ||
359 | /* GDT[0]: GDT self-pointer */ | |
360 | lowmem_gdt[0] = | |
361 | (u64)(sizeof(machine_real_restart_gdt) - 1) + | |
362 | ((u64)virt_to_phys(lowmem_gdt) << 16); | |
363 | /* GDT[1]: 64K real mode code segment */ | |
364 | lowmem_gdt[1] = | |
365 | GDT_ENTRY(0x009b, restart_pa, 0xffff); | |
366 | ||
367 | /* Jump to the identity-mapped low memory code */ | |
368 | restart_lowmem(type); | |
1da177e4 | 369 | } |
129f6946 AD |
370 | #ifdef CONFIG_APM_MODULE |
371 | EXPORT_SYMBOL(machine_real_restart); | |
372 | #endif | |
1da177e4 | 373 | |
4d022e35 MB |
374 | #endif /* CONFIG_X86_32 */ |
375 | ||
6c6c51e4 | 376 | /* |
498cdbfb | 377 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot |
6c6c51e4 PM |
378 | */ |
379 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
380 | { | |
381 | if (reboot_type != BOOT_CF9) { | |
382 | reboot_type = BOOT_CF9; | |
383 | printk(KERN_INFO "%s series board detected. " | |
384 | "Selecting PCI-method for reboots.\n", d->ident); | |
385 | } | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static struct dmi_system_id __initdata pci_reboot_dmi_table[] = { | |
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 | }, | |
6c6c51e4 PM |
422 | { } |
423 | }; | |
424 | ||
425 | static int __init pci_reboot_init(void) | |
426 | { | |
427 | dmi_check_system(pci_reboot_dmi_table); | |
428 | return 0; | |
429 | } | |
430 | core_initcall(pci_reboot_init); | |
431 | ||
4d022e35 MB |
432 | static inline void kb_wait(void) |
433 | { | |
434 | int i; | |
435 | ||
c84d6af8 AC |
436 | for (i = 0; i < 0x10000; i++) { |
437 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 438 | break; |
c84d6af8 AC |
439 | udelay(2); |
440 | } | |
4d022e35 MB |
441 | } |
442 | ||
d176720d EH |
443 | static void vmxoff_nmi(int cpu, struct die_args *args) |
444 | { | |
445 | cpu_emergency_vmxoff(); | |
446 | } | |
447 | ||
448 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization | |
449 | */ | |
450 | static void emergency_vmx_disable_all(void) | |
451 | { | |
452 | /* Just make sure we won't change CPUs while doing this */ | |
453 | local_irq_disable(); | |
454 | ||
455 | /* We need to disable VMX on all CPUs before rebooting, otherwise | |
456 | * we risk hanging up the machine, because the CPU ignore INIT | |
457 | * signals when VMX is enabled. | |
458 | * | |
459 | * We can't take any locks and we may be on an inconsistent | |
460 | * state, so we use NMIs as IPIs to tell the other CPUs to disable | |
461 | * VMX and halt. | |
462 | * | |
463 | * For safety, we will avoid running the nmi_shootdown_cpus() | |
464 | * stuff unnecessarily, but we don't have a way to check | |
465 | * if other CPUs have VMX enabled. So we will call it only if the | |
466 | * CPU we are running on has VMX enabled. | |
467 | * | |
468 | * We will miss cases where VMX is not enabled on all CPUs. This | |
469 | * shouldn't do much harm because KVM always enable VMX on all | |
470 | * CPUs anyway. But we can miss it on the small window where KVM | |
471 | * is still enabling VMX. | |
472 | */ | |
473 | if (cpu_has_vmx() && cpu_vmx_enabled()) { | |
474 | /* Disable VMX on this CPU. | |
475 | */ | |
476 | cpu_vmxoff(); | |
477 | ||
478 | /* Halt and disable VMX on the other CPUs */ | |
479 | nmi_shootdown_cpus(vmxoff_nmi); | |
480 | ||
481 | } | |
482 | } | |
483 | ||
484 | ||
7432d149 IM |
485 | void __attribute__((weak)) mach_reboot_fixups(void) |
486 | { | |
487 | } | |
488 | ||
660e34ce MG |
489 | /* |
490 | * Windows compatible x86 hardware expects the following on reboot: | |
491 | * | |
492 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
493 | * 2) If still alive, write to the keyboard controller | |
494 | * 3) If still alive, write to the ACPI reboot register again | |
495 | * 4) If still alive, write to the keyboard controller again | |
496 | * | |
497 | * If the machine is still alive at this stage, it gives up. We default to | |
498 | * following the same pattern, except that if we're still alive after (4) we'll | |
499 | * try to force a triple fault and then cycle between hitting the keyboard | |
500 | * controller and doing that | |
501 | */ | |
416e2d63 | 502 | static void native_machine_emergency_restart(void) |
1da177e4 | 503 | { |
4d022e35 | 504 | int i; |
660e34ce MG |
505 | int attempt = 0; |
506 | int orig_reboot_type = reboot_type; | |
4d022e35 | 507 | |
d176720d EH |
508 | if (reboot_emergency) |
509 | emergency_vmx_disable_all(); | |
510 | ||
840c2baf JC |
511 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
512 | ||
4d022e35 MB |
513 | /* Tell the BIOS if we want cold or warm reboot */ |
514 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
515 | ||
516 | for (;;) { | |
517 | /* Could also try the reset bit in the Hammer NB */ | |
518 | switch (reboot_type) { | |
519 | case BOOT_KBD: | |
7432d149 IM |
520 | mach_reboot_fixups(); /* for board specific fixups */ |
521 | ||
4d022e35 MB |
522 | for (i = 0; i < 10; i++) { |
523 | kb_wait(); | |
524 | udelay(50); | |
525 | outb(0xfe, 0x64); /* pulse reset low */ | |
526 | udelay(50); | |
527 | } | |
660e34ce MG |
528 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
529 | attempt = 1; | |
530 | reboot_type = BOOT_ACPI; | |
531 | } else { | |
532 | reboot_type = BOOT_TRIPLE; | |
533 | } | |
534 | break; | |
4d022e35 MB |
535 | |
536 | case BOOT_TRIPLE: | |
ebdd561a | 537 | load_idt(&no_idt); |
4d022e35 MB |
538 | __asm__ __volatile__("int3"); |
539 | ||
540 | reboot_type = BOOT_KBD; | |
541 | break; | |
542 | ||
543 | #ifdef CONFIG_X86_32 | |
544 | case BOOT_BIOS: | |
3d35ac34 | 545 | machine_real_restart(MRR_BIOS); |
4d022e35 MB |
546 | |
547 | reboot_type = BOOT_KBD; | |
548 | break; | |
549 | #endif | |
550 | ||
551 | case BOOT_ACPI: | |
552 | acpi_reboot(); | |
553 | reboot_type = BOOT_KBD; | |
554 | break; | |
555 | ||
4d022e35 MB |
556 | case BOOT_EFI: |
557 | if (efi_enabled) | |
14d7ca5c PA |
558 | efi.reset_system(reboot_mode ? |
559 | EFI_RESET_WARM : | |
560 | EFI_RESET_COLD, | |
4d022e35 | 561 | EFI_SUCCESS, 0, NULL); |
b47b9288 | 562 | reboot_type = BOOT_KBD; |
14d7ca5c | 563 | break; |
4d022e35 | 564 | |
14d7ca5c PA |
565 | case BOOT_CF9: |
566 | port_cf9_safe = true; | |
567 | /* fall through */ | |
4d022e35 | 568 | |
14d7ca5c PA |
569 | case BOOT_CF9_COND: |
570 | if (port_cf9_safe) { | |
571 | u8 cf9 = inb(0xcf9) & ~6; | |
572 | outb(cf9|2, 0xcf9); /* Request hard reset */ | |
573 | udelay(50); | |
574 | outb(cf9|6, 0xcf9); /* Actually do the reset */ | |
575 | udelay(50); | |
576 | } | |
4d022e35 MB |
577 | reboot_type = BOOT_KBD; |
578 | break; | |
579 | } | |
580 | } | |
581 | } | |
582 | ||
3c62c625 | 583 | void native_machine_shutdown(void) |
4d022e35 MB |
584 | { |
585 | /* Stop the cpus and apics */ | |
1da177e4 | 586 | #ifdef CONFIG_SMP |
dd2a1305 EB |
587 | |
588 | /* The boot cpu is always logical cpu 0 */ | |
65c01184 | 589 | int reboot_cpu_id = 0; |
dd2a1305 | 590 | |
4d022e35 | 591 | #ifdef CONFIG_X86_32 |
dd2a1305 | 592 | /* See if there has been given a command line override */ |
9628937d | 593 | if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) && |
0bc3cc03 | 594 | cpu_online(reboot_cpu)) |
dd2a1305 | 595 | reboot_cpu_id = reboot_cpu; |
4d022e35 | 596 | #endif |
1da177e4 | 597 | |
4d022e35 | 598 | /* Make certain the cpu I'm about to reboot on is online */ |
0bc3cc03 | 599 | if (!cpu_online(reboot_cpu_id)) |
dd2a1305 | 600 | reboot_cpu_id = smp_processor_id(); |
dd2a1305 EB |
601 | |
602 | /* Make certain I only run on the appropriate processor */ | |
9628937d | 603 | set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); |
dd2a1305 | 604 | |
4d022e35 MB |
605 | /* O.K Now that I'm on the appropriate processor, |
606 | * stop all of the others. | |
1da177e4 | 607 | */ |
76fac077 | 608 | stop_other_cpus(); |
4d022e35 | 609 | #endif |
1da177e4 LT |
610 | |
611 | lapic_shutdown(); | |
612 | ||
613 | #ifdef CONFIG_X86_IO_APIC | |
614 | disable_IO_APIC(); | |
615 | #endif | |
4d022e35 | 616 | |
c86c7fbc OH |
617 | #ifdef CONFIG_HPET_TIMER |
618 | hpet_disable(); | |
619 | #endif | |
dd2a1305 | 620 | |
4d022e35 | 621 | #ifdef CONFIG_X86_64 |
338bac52 | 622 | x86_platform.iommu_shutdown(); |
4d022e35 | 623 | #endif |
973efae2 JF |
624 | } |
625 | ||
d176720d EH |
626 | static void __machine_emergency_restart(int emergency) |
627 | { | |
628 | reboot_emergency = emergency; | |
629 | machine_ops.emergency_restart(); | |
630 | } | |
631 | ||
416e2d63 | 632 | static void native_machine_restart(char *__unused) |
dd2a1305 | 633 | { |
4d022e35 | 634 | printk("machine restart\n"); |
1da177e4 | 635 | |
4d022e35 MB |
636 | if (!reboot_force) |
637 | machine_shutdown(); | |
d176720d | 638 | __machine_emergency_restart(0); |
4a1421f8 EB |
639 | } |
640 | ||
416e2d63 | 641 | static void native_machine_halt(void) |
1da177e4 | 642 | { |
d3ec5cae IV |
643 | /* stop other cpus and apics */ |
644 | machine_shutdown(); | |
645 | ||
840c2baf JC |
646 | tboot_shutdown(TB_SHUTDOWN_HALT); |
647 | ||
d3ec5cae IV |
648 | /* stop this cpu */ |
649 | stop_this_cpu(NULL); | |
1da177e4 LT |
650 | } |
651 | ||
416e2d63 | 652 | static void native_machine_power_off(void) |
1da177e4 | 653 | { |
6e3fbee5 | 654 | if (pm_power_off) { |
4d022e35 MB |
655 | if (!reboot_force) |
656 | machine_shutdown(); | |
1da177e4 | 657 | pm_power_off(); |
6e3fbee5 | 658 | } |
840c2baf JC |
659 | /* a fallback in case there is no PM info available */ |
660 | tboot_shutdown(TB_SHUTDOWN_HALT); | |
1da177e4 LT |
661 | } |
662 | ||
07f3331c | 663 | struct machine_ops machine_ops = { |
416e2d63 JB |
664 | .power_off = native_machine_power_off, |
665 | .shutdown = native_machine_shutdown, | |
666 | .emergency_restart = native_machine_emergency_restart, | |
667 | .restart = native_machine_restart, | |
ed23dc6f GC |
668 | .halt = native_machine_halt, |
669 | #ifdef CONFIG_KEXEC | |
670 | .crash_shutdown = native_machine_crash_shutdown, | |
671 | #endif | |
07f3331c | 672 | }; |
416e2d63 JB |
673 | |
674 | void machine_power_off(void) | |
675 | { | |
676 | machine_ops.power_off(); | |
677 | } | |
678 | ||
679 | void machine_shutdown(void) | |
680 | { | |
681 | machine_ops.shutdown(); | |
682 | } | |
683 | ||
684 | void machine_emergency_restart(void) | |
685 | { | |
d176720d | 686 | __machine_emergency_restart(1); |
416e2d63 JB |
687 | } |
688 | ||
689 | void machine_restart(char *cmd) | |
690 | { | |
691 | machine_ops.restart(cmd); | |
692 | } | |
693 | ||
694 | void machine_halt(void) | |
695 | { | |
696 | machine_ops.halt(); | |
697 | } | |
698 | ||
ed23dc6f GC |
699 | #ifdef CONFIG_KEXEC |
700 | void machine_crash_shutdown(struct pt_regs *regs) | |
701 | { | |
702 | machine_ops.crash_shutdown(regs); | |
703 | } | |
704 | #endif | |
2ddded21 EH |
705 | |
706 | ||
bb8dd270 | 707 | #if defined(CONFIG_SMP) |
2ddded21 EH |
708 | |
709 | /* This keeps a track of which one is crashing cpu. */ | |
710 | static int crashing_cpu; | |
711 | static nmi_shootdown_cb shootdown_callback; | |
712 | ||
713 | static atomic_t waiting_for_crash_ipi; | |
714 | ||
715 | static int crash_nmi_callback(struct notifier_block *self, | |
716 | unsigned long val, void *data) | |
717 | { | |
718 | int cpu; | |
719 | ||
c410b830 | 720 | if (val != DIE_NMI) |
2ddded21 EH |
721 | return NOTIFY_OK; |
722 | ||
723 | cpu = raw_smp_processor_id(); | |
724 | ||
725 | /* Don't do anything if this handler is invoked on crashing cpu. | |
726 | * Otherwise, system will completely hang. Crashing cpu can get | |
727 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
728 | */ | |
729 | if (cpu == crashing_cpu) | |
730 | return NOTIFY_STOP; | |
731 | local_irq_disable(); | |
732 | ||
733 | shootdown_callback(cpu, (struct die_args *)data); | |
734 | ||
735 | atomic_dec(&waiting_for_crash_ipi); | |
736 | /* Assume hlt works */ | |
737 | halt(); | |
738 | for (;;) | |
739 | cpu_relax(); | |
740 | ||
741 | return 1; | |
742 | } | |
743 | ||
744 | static void smp_send_nmi_allbutself(void) | |
745 | { | |
dac5f412 | 746 | apic->send_IPI_allbutself(NMI_VECTOR); |
2ddded21 EH |
747 | } |
748 | ||
749 | static struct notifier_block crash_nmi_nb = { | |
750 | .notifier_call = crash_nmi_callback, | |
166d7514 DZ |
751 | /* we want to be the first one called */ |
752 | .priority = NMI_LOCAL_HIGH_PRIOR+1, | |
2ddded21 EH |
753 | }; |
754 | ||
bb8dd270 EH |
755 | /* Halt all other CPUs, calling the specified function on each of them |
756 | * | |
757 | * This function can be used to halt all other CPUs on crash | |
758 | * or emergency reboot time. The function passed as parameter | |
759 | * will be called inside a NMI handler on all CPUs. | |
760 | */ | |
2ddded21 EH |
761 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
762 | { | |
763 | unsigned long msecs; | |
c415b3dc | 764 | local_irq_disable(); |
2ddded21 EH |
765 | |
766 | /* Make a note of crashing cpu. Will be used in NMI callback.*/ | |
767 | crashing_cpu = safe_smp_processor_id(); | |
768 | ||
769 | shootdown_callback = callback; | |
770 | ||
771 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
772 | /* Would it be better to replace the trap vector here? */ | |
773 | if (register_die_notifier(&crash_nmi_nb)) | |
774 | return; /* return what? */ | |
775 | /* Ensure the new callback function is set before sending | |
776 | * out the NMI | |
777 | */ | |
778 | wmb(); | |
779 | ||
780 | smp_send_nmi_allbutself(); | |
781 | ||
782 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
783 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
784 | mdelay(1); | |
785 | msecs--; | |
786 | } | |
787 | ||
788 | /* Leave the nmi callback set */ | |
789 | } | |
bb8dd270 EH |
790 | #else /* !CONFIG_SMP */ |
791 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
792 | { | |
793 | /* No other CPUs to shoot down */ | |
794 | } | |
2ddded21 | 795 | #endif |