Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/mm.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/delay.h> | |
4 | #include <linux/init.h> | |
5 | #include <linux/interrupt.h> | |
6 | #include <linux/mc146818rtc.h> | |
7 | #include <linux/efi.h> | |
8 | #include <linux/dmi.h> | |
6f673d83 | 9 | #include <linux/ctype.h> |
6e3fbee5 | 10 | #include <linux/pm.h> |
cd6ed525 | 11 | #include <linux/reboot.h> |
1da177e4 LT |
12 | #include <asm/uaccess.h> |
13 | #include <asm/apic.h> | |
4d37e7e3 | 14 | #include <asm/desc.h> |
1da177e4 | 15 | #include "mach_reboot.h" |
973efae2 | 16 | #include <asm/reboot_fixups.h> |
07f3331c | 17 | #include <asm/reboot.h> |
1da177e4 LT |
18 | |
19 | /* | |
20 | * Power off function, if any | |
21 | */ | |
22 | void (*pm_power_off)(void); | |
129f6946 | 23 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
24 | |
25 | static int reboot_mode; | |
26 | static int reboot_thru_bios; | |
27 | ||
28 | #ifdef CONFIG_SMP | |
1da177e4 | 29 | static int reboot_cpu = -1; |
1da177e4 LT |
30 | #endif |
31 | static int __init reboot_setup(char *str) | |
32 | { | |
33 | while(1) { | |
34 | switch (*str) { | |
35 | case 'w': /* "warm" reboot (no memory testing etc) */ | |
36 | reboot_mode = 0x1234; | |
37 | break; | |
38 | case 'c': /* "cold" reboot (with memory testing etc) */ | |
39 | reboot_mode = 0x0; | |
40 | break; | |
41 | case 'b': /* "bios" reboot by jumping through the BIOS */ | |
42 | reboot_thru_bios = 1; | |
43 | break; | |
44 | case 'h': /* "hard" reboot by toggling RESET and/or crashing the CPU */ | |
45 | reboot_thru_bios = 0; | |
46 | break; | |
47 | #ifdef CONFIG_SMP | |
48 | case 's': /* "smp" reboot by executing reset on BSP or other CPU*/ | |
6f673d83 | 49 | if (isdigit(*(str+1))) { |
1da177e4 | 50 | reboot_cpu = (int) (*(str+1) - '0'); |
6f673d83 | 51 | if (isdigit(*(str+2))) |
1da177e4 LT |
52 | reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
53 | } | |
54 | /* we will leave sorting out the final value | |
55 | when we are ready to reboot, since we might not | |
56 | have set up boot_cpu_id or smp_num_cpu */ | |
57 | break; | |
58 | #endif | |
59 | } | |
60 | if((str = strchr(str,',')) != NULL) | |
61 | str++; | |
62 | else | |
63 | break; | |
64 | } | |
65 | return 1; | |
66 | } | |
67 | ||
68 | __setup("reboot=", reboot_setup); | |
69 | ||
70 | /* | |
71 | * Reboot options and system auto-detection code provided by | |
72 | * Dell Inc. so their systems "just work". :-) | |
73 | */ | |
74 | ||
75 | /* | |
76 | * Some machines require the "reboot=b" commandline option, this quirk makes that automatic. | |
77 | */ | |
1855256c | 78 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 LT |
79 | { |
80 | if (!reboot_thru_bios) { | |
81 | reboot_thru_bios = 1; | |
82 | printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
1da177e4 | 87 | static struct dmi_system_id __initdata reboot_dmi_table[] = { |
b9e82af8 TG |
88 | { /* Handle problems with rebooting on Dell E520's */ |
89 | .callback = set_bios_reboot, | |
90 | .ident = "Dell E520", | |
91 | .matches = { | |
92 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
93 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), | |
94 | }, | |
95 | }, | |
1da177e4 | 96 | { /* Handle problems with rebooting on Dell 1300's */ |
dd2a1305 | 97 | .callback = set_bios_reboot, |
1da177e4 LT |
98 | .ident = "Dell PowerEdge 1300", |
99 | .matches = { | |
100 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
101 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
102 | }, | |
103 | }, | |
104 | { /* Handle problems with rebooting on Dell 300's */ | |
105 | .callback = set_bios_reboot, | |
106 | .ident = "Dell PowerEdge 300", | |
107 | .matches = { | |
108 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
109 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
110 | }, | |
111 | }, | |
df2edcf3 JJ |
112 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/ |
113 | .callback = set_bios_reboot, | |
114 | .ident = "Dell OptiPlex 745", | |
115 | .matches = { | |
116 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
117 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
118 | DMI_MATCH(DMI_BOARD_NAME, "0WF810"), | |
119 | }, | |
120 | }, | |
1da177e4 LT |
121 | { /* Handle problems with rebooting on Dell 2400's */ |
122 | .callback = set_bios_reboot, | |
123 | .ident = "Dell PowerEdge 2400", | |
124 | .matches = { | |
125 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
126 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
127 | }, | |
128 | }, | |
766c3f94 | 129 | { /* Handle problems with rebooting on HP laptops */ |
d91b14c4 | 130 | .callback = set_bios_reboot, |
766c3f94 | 131 | .ident = "HP Compaq Laptop", |
d91b14c4 TV |
132 | .matches = { |
133 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
766c3f94 | 134 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
d91b14c4 TV |
135 | }, |
136 | }, | |
1da177e4 LT |
137 | { } |
138 | }; | |
139 | ||
140 | static int __init reboot_init(void) | |
141 | { | |
142 | dmi_check_system(reboot_dmi_table); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | core_initcall(reboot_init); | |
147 | ||
148 | /* The following code and data reboots the machine by switching to real | |
149 | mode and jumping to the BIOS reset entry point, as if the CPU has | |
150 | really been reset. The previous version asked the keyboard | |
151 | controller to pulse the CPU reset line, which is more thorough, but | |
152 | doesn't work with at least one type of 486 motherboard. It is easy | |
153 | to stop this code working; hence the copious comments. */ | |
154 | ||
155 | static unsigned long long | |
156 | real_mode_gdt_entries [3] = | |
157 | { | |
158 | 0x0000000000000000ULL, /* Null descriptor */ | |
159 | 0x00009a000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */ | |
160 | 0x000092000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */ | |
161 | }; | |
162 | ||
05f4a3ec RR |
163 | static struct Xgt_desc_struct |
164 | real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries }, | |
165 | real_mode_idt = { 0x3ff, 0 }, | |
166 | no_idt = { 0, 0 }; | |
1da177e4 LT |
167 | |
168 | ||
169 | /* This is 16-bit protected mode code to disable paging and the cache, | |
170 | switch to real mode and jump to the BIOS reset code. | |
171 | ||
172 | The instruction that switches to real mode by writing to CR0 must be | |
173 | followed immediately by a far jump instruction, which set CS to a | |
174 | valid value for real mode, and flushes the prefetch queue to avoid | |
175 | running instructions that have already been decoded in protected | |
176 | mode. | |
177 | ||
178 | Clears all the flags except ET, especially PG (paging), PE | |
179 | (protected-mode enable) and TS (task switch for coprocessor state | |
180 | save). Flushes the TLB after paging has been disabled. Sets CD and | |
181 | NW, to disable the cache on a 486, and invalidates the cache. This | |
182 | is more like the state of a 486 after reset. I don't know if | |
183 | something else should be done for other chips. | |
184 | ||
185 | More could be done here to set up the registers as if a CPU reset had | |
186 | occurred; hopefully real BIOSs don't assume much. */ | |
187 | ||
188 | static unsigned char real_mode_switch [] = | |
189 | { | |
190 | 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */ | |
191 | 0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */ | |
192 | 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */ | |
193 | 0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */ | |
194 | 0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */ | |
195 | 0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */ | |
196 | 0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */ | |
197 | 0x74, 0x02, /* jz f */ | |
198 | 0x0f, 0x09, /* wbinvd */ | |
199 | 0x24, 0x10, /* f: andb $0x10,al */ | |
200 | 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */ | |
201 | }; | |
202 | static unsigned char jump_to_bios [] = | |
203 | { | |
204 | 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */ | |
205 | }; | |
206 | ||
207 | /* | |
208 | * Switch to real mode and then execute the code | |
209 | * specified by the code and length parameters. | |
210 | * We assume that length will aways be less that 100! | |
211 | */ | |
212 | void machine_real_restart(unsigned char *code, int length) | |
213 | { | |
1da177e4 LT |
214 | local_irq_disable(); |
215 | ||
216 | /* Write zero to CMOS register number 0x0f, which the BIOS POST | |
217 | routine will recognize as telling it to do a proper reboot. (Well | |
218 | that's what this book in front of me says -- it may only apply to | |
219 | the Phoenix BIOS though, it's not clear). At the same time, | |
220 | disable NMIs by setting the top bit in the CMOS address register, | |
221 | as we're about to do peculiar things to the CPU. I'm not sure if | |
222 | `outb_p' is needed instead of just `outb'. Use it to be on the | |
223 | safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
224 | */ | |
225 | ||
62dbc210 | 226 | spin_lock(&rtc_lock); |
1da177e4 | 227 | CMOS_WRITE(0x00, 0x8f); |
62dbc210 | 228 | spin_unlock(&rtc_lock); |
1da177e4 LT |
229 | |
230 | /* Remap the kernel at virtual address zero, as well as offset zero | |
231 | from the kernel segment. This assumes the kernel segment starts at | |
232 | virtual address PAGE_OFFSET. */ | |
233 | ||
234 | memcpy (swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, | |
235 | sizeof (swapper_pg_dir [0]) * KERNEL_PGD_PTRS); | |
236 | ||
237 | /* | |
238 | * Use `swapper_pg_dir' as our page directory. | |
239 | */ | |
240 | load_cr3(swapper_pg_dir); | |
241 | ||
242 | /* Write 0x1234 to absolute memory location 0x472. The BIOS reads | |
243 | this on booting to tell it to "Bypass memory test (also warm | |
244 | boot)". This seems like a fairly standard thing that gets set by | |
245 | REBOOT.COM programs, and the previous reset routine did this | |
246 | too. */ | |
247 | ||
248 | *((unsigned short *)0x472) = reboot_mode; | |
249 | ||
250 | /* For the switch to real mode, copy some code to low memory. It has | |
251 | to be in the first 64k because it is running in 16-bit mode, and it | |
252 | has to have the same physical and virtual address, because it turns | |
253 | off paging. Copy it near the end of the first page, out of the way | |
254 | of BIOS variables. */ | |
255 | ||
256 | memcpy ((void *) (0x1000 - sizeof (real_mode_switch) - 100), | |
257 | real_mode_switch, sizeof (real_mode_switch)); | |
258 | memcpy ((void *) (0x1000 - 100), code, length); | |
259 | ||
260 | /* Set up the IDT for real mode. */ | |
261 | ||
4d37e7e3 | 262 | load_idt(&real_mode_idt); |
1da177e4 LT |
263 | |
264 | /* Set up a GDT from which we can load segment descriptors for real | |
265 | mode. The GDT is not used in real mode; it is just needed here to | |
266 | prepare the descriptors. */ | |
267 | ||
4d37e7e3 | 268 | load_gdt(&real_mode_gdt); |
1da177e4 LT |
269 | |
270 | /* Load the data segment registers, and thus the descriptors ready for | |
271 | real mode. The base address of each segment is 0x100, 16 times the | |
272 | selector value being loaded here. This is so that the segment | |
273 | registers don't have to be reloaded after switching to real mode: | |
274 | the values are consistent for real mode operation already. */ | |
275 | ||
276 | __asm__ __volatile__ ("movl $0x0010,%%eax\n" | |
277 | "\tmovl %%eax,%%ds\n" | |
278 | "\tmovl %%eax,%%es\n" | |
279 | "\tmovl %%eax,%%fs\n" | |
280 | "\tmovl %%eax,%%gs\n" | |
281 | "\tmovl %%eax,%%ss" : : : "eax"); | |
282 | ||
283 | /* Jump to the 16-bit code that we copied earlier. It disables paging | |
284 | and the cache, switches to real mode, and jumps to the BIOS reset | |
285 | entry point. */ | |
286 | ||
287 | __asm__ __volatile__ ("ljmp $0x0008,%0" | |
288 | : | |
289 | : "i" ((void *) (0x1000 - sizeof (real_mode_switch) - 100))); | |
290 | } | |
129f6946 AD |
291 | #ifdef CONFIG_APM_MODULE |
292 | EXPORT_SYMBOL(machine_real_restart); | |
293 | #endif | |
1da177e4 | 294 | |
07f3331c | 295 | static void native_machine_shutdown(void) |
1da177e4 LT |
296 | { |
297 | #ifdef CONFIG_SMP | |
dd2a1305 EB |
298 | int reboot_cpu_id; |
299 | ||
300 | /* The boot cpu is always logical cpu 0 */ | |
301 | reboot_cpu_id = 0; | |
302 | ||
303 | /* See if there has been given a command line override */ | |
d8e392e7 | 304 | if ((reboot_cpu != -1) && (reboot_cpu < NR_CPUS) && |
dd2a1305 EB |
305 | cpu_isset(reboot_cpu, cpu_online_map)) { |
306 | reboot_cpu_id = reboot_cpu; | |
1da177e4 LT |
307 | } |
308 | ||
dd2a1305 EB |
309 | /* Make certain the cpu I'm rebooting on is online */ |
310 | if (!cpu_isset(reboot_cpu_id, cpu_online_map)) { | |
311 | reboot_cpu_id = smp_processor_id(); | |
1da177e4 | 312 | } |
dd2a1305 EB |
313 | |
314 | /* Make certain I only run on the appropriate processor */ | |
315 | set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id)); | |
316 | ||
317 | /* O.K. Now that I'm on the appropriate processor, stop | |
318 | * all of the others, and disable their local APICs. | |
1da177e4 | 319 | */ |
dd2a1305 | 320 | |
1da177e4 LT |
321 | smp_send_stop(); |
322 | #endif /* CONFIG_SMP */ | |
323 | ||
324 | lapic_shutdown(); | |
325 | ||
326 | #ifdef CONFIG_X86_IO_APIC | |
327 | disable_IO_APIC(); | |
328 | #endif | |
dd2a1305 EB |
329 | } |
330 | ||
973efae2 JF |
331 | void __attribute__((weak)) mach_reboot_fixups(void) |
332 | { | |
333 | } | |
334 | ||
07f3331c | 335 | static void native_machine_emergency_restart(void) |
dd2a1305 | 336 | { |
1da177e4 LT |
337 | if (!reboot_thru_bios) { |
338 | if (efi_enabled) { | |
339 | efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL); | |
4d37e7e3 | 340 | load_idt(&no_idt); |
1da177e4 LT |
341 | __asm__ __volatile__("int3"); |
342 | } | |
343 | /* rebooting needs to touch the page at absolute addr 0 */ | |
344 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
345 | for (;;) { | |
a2f7c354 | 346 | mach_reboot_fixups(); /* for board specific fixups */ |
1da177e4 LT |
347 | mach_reboot(); |
348 | /* That didn't work - force a triple fault.. */ | |
4d37e7e3 | 349 | load_idt(&no_idt); |
1da177e4 LT |
350 | __asm__ __volatile__("int3"); |
351 | } | |
352 | } | |
353 | if (efi_enabled) | |
354 | efi.reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL); | |
355 | ||
356 | machine_real_restart(jump_to_bios, sizeof(jump_to_bios)); | |
357 | } | |
358 | ||
07f3331c | 359 | static void native_machine_restart(char * __unused) |
4a1421f8 EB |
360 | { |
361 | machine_shutdown(); | |
362 | machine_emergency_restart(); | |
363 | } | |
364 | ||
07f3331c | 365 | static void native_machine_halt(void) |
1da177e4 LT |
366 | { |
367 | } | |
368 | ||
07f3331c | 369 | static void native_machine_power_off(void) |
1da177e4 | 370 | { |
6e3fbee5 EB |
371 | if (pm_power_off) { |
372 | machine_shutdown(); | |
1da177e4 | 373 | pm_power_off(); |
6e3fbee5 | 374 | } |
1da177e4 LT |
375 | } |
376 | ||
1da177e4 | 377 | |
07f3331c JF |
378 | struct machine_ops machine_ops = { |
379 | .power_off = native_machine_power_off, | |
380 | .shutdown = native_machine_shutdown, | |
381 | .emergency_restart = native_machine_emergency_restart, | |
382 | .restart = native_machine_restart, | |
383 | .halt = native_machine_halt, | |
384 | }; | |
385 | ||
386 | void machine_power_off(void) | |
387 | { | |
388 | machine_ops.power_off(); | |
389 | } | |
390 | ||
391 | void machine_shutdown(void) | |
392 | { | |
393 | machine_ops.shutdown(); | |
394 | } | |
395 | ||
396 | void machine_emergency_restart(void) | |
397 | { | |
398 | machine_ops.emergency_restart(); | |
399 | } | |
400 | ||
401 | void machine_restart(char *cmd) | |
402 | { | |
403 | machine_ops.restart(cmd); | |
404 | } | |
405 | ||
406 | void machine_halt(void) | |
407 | { | |
408 | machine_ops.halt(); | |
409 | } |