1 #include <linux/module.h>
2 #include <linux/reboot.h>
3 #include <linux/init.h>
6 #include <acpi/reboot.h>
11 #include <asm/pgtable.h>
12 #include <asm/proto.h>
13 #include <asm/reboot_fixups.h>
14 #include <asm/reboot.h>
17 # include <linux/dmi.h>
18 # include <linux/ctype.h>
19 # include <linux/mc146818rtc.h>
21 # include <asm/iommu.h>
25 * Power off function, if any
27 void (*pm_power_off)(void);
28 EXPORT_SYMBOL(pm_power_off);
30 static const struct desc_ptr no_idt = {};
31 static int reboot_mode;
32 enum reboot_type reboot_type = BOOT_KBD;
35 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
36 static int reboot_cpu = -1;
39 /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old]
40 warm Don't set the cold reboot flag
41 cold Set the cold reboot flag
42 bios Reboot by jumping through the BIOS (only for X86_32)
43 smp Reboot by executing reset on BSP or other CPU (only for X86_32)
44 triple Force a triple fault (init)
45 kbd Use the keyboard controller. cold reset (default)
46 acpi Use the RESET_REG in the FADT
47 efi Use efi reset_system runtime service
48 force Avoid anything that could hang.
50 static int __init reboot_setup(char *str)
65 if (isdigit(*(str+1))) {
66 reboot_cpu = (int) (*(str+1) - '0');
67 if (isdigit(*(str+2)))
68 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
70 /* we will leave sorting out the final value
71 when we are ready to reboot, since we might not
72 have set up boot_cpu_id or smp_num_cpu */
74 #endif /* CONFIG_SMP */
90 str = strchr(str, ',');
99 __setup("reboot=", reboot_setup);
104 * Reboot options and system auto-detection code provided by
105 * Dell Inc. so their systems "just work". :-)
109 * Some machines require the "reboot=b" commandline option,
110 * this quirk makes that automatic.
112 static int __init set_bios_reboot(const struct dmi_system_id *d)
114 if (reboot_type != BOOT_BIOS) {
115 reboot_type = BOOT_BIOS;
116 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
121 static struct dmi_system_id __initdata reboot_dmi_table[] = {
122 { /* Handle problems with rebooting on Dell E520's */
123 .callback = set_bios_reboot,
124 .ident = "Dell E520",
126 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
127 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
130 { /* Handle problems with rebooting on Dell 1300's */
131 .callback = set_bios_reboot,
132 .ident = "Dell PowerEdge 1300",
134 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
135 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
138 { /* Handle problems with rebooting on Dell 300's */
139 .callback = set_bios_reboot,
140 .ident = "Dell PowerEdge 300",
142 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
143 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
146 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
147 .callback = set_bios_reboot,
148 .ident = "Dell OptiPlex 745",
150 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
151 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
154 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
155 .callback = set_bios_reboot,
156 .ident = "Dell OptiPlex 745",
158 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
159 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
160 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
163 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
164 .callback = set_bios_reboot,
165 .ident = "Dell OptiPlex 745",
167 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
168 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
169 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
172 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
173 .callback = set_bios_reboot,
174 .ident = "Dell OptiPlex 360",
176 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
177 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
178 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
181 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
182 .callback = set_bios_reboot,
183 .ident = "Dell OptiPlex 330",
185 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
186 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
187 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
190 { /* Handle problems with rebooting on Dell 2400's */
191 .callback = set_bios_reboot,
192 .ident = "Dell PowerEdge 2400",
194 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
195 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
198 { /* Handle problems with rebooting on Dell T5400's */
199 .callback = set_bios_reboot,
200 .ident = "Dell Precision T5400",
202 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
206 { /* Handle problems with rebooting on HP laptops */
207 .callback = set_bios_reboot,
208 .ident = "HP Compaq Laptop",
210 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
211 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
214 { /* Handle problems with rebooting on Dell XPS710 */
215 .callback = set_bios_reboot,
216 .ident = "Dell XPS710",
218 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
219 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
222 { /* Handle problems with rebooting on ASUS P4S800 */
223 .callback = set_bios_reboot,
224 .ident = "ASUS P4S800",
226 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
227 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
230 { /* Handle problems with rebooting on the Latitude E5420. */
231 .callback = set_pci_reboot,
232 .ident = "Dell Latitude E5420",
234 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
235 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
241 static int __init reboot_init(void)
243 dmi_check_system(reboot_dmi_table);
246 core_initcall(reboot_init);
248 /* The following code and data reboots the machine by switching to real
249 mode and jumping to the BIOS reset entry point, as if the CPU has
250 really been reset. The previous version asked the keyboard
251 controller to pulse the CPU reset line, which is more thorough, but
252 doesn't work with at least one type of 486 motherboard. It is easy
253 to stop this code working; hence the copious comments. */
254 static const unsigned long long
255 real_mode_gdt_entries [3] =
257 0x0000000000000000ULL, /* Null descriptor */
258 0x00009b000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */
259 0x000093000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */
262 static const struct desc_ptr
263 real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries },
264 real_mode_idt = { 0x3ff, 0 };
266 /* This is 16-bit protected mode code to disable paging and the cache,
267 switch to real mode and jump to the BIOS reset code.
269 The instruction that switches to real mode by writing to CR0 must be
270 followed immediately by a far jump instruction, which set CS to a
271 valid value for real mode, and flushes the prefetch queue to avoid
272 running instructions that have already been decoded in protected
275 Clears all the flags except ET, especially PG (paging), PE
276 (protected-mode enable) and TS (task switch for coprocessor state
277 save). Flushes the TLB after paging has been disabled. Sets CD and
278 NW, to disable the cache on a 486, and invalidates the cache. This
279 is more like the state of a 486 after reset. I don't know if
280 something else should be done for other chips.
282 More could be done here to set up the registers as if a CPU reset had
283 occurred; hopefully real BIOSs don't assume much. */
284 static const unsigned char real_mode_switch [] =
286 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */
287 0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */
288 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */
289 0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */
290 0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */
291 0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */
292 0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */
293 0x74, 0x02, /* jz f */
294 0x0f, 0x09, /* wbinvd */
295 0x24, 0x10, /* f: andb $0x10,al */
296 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */
298 static const unsigned char jump_to_bios [] =
300 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */
304 * Switch to real mode and then execute the code
305 * specified by the code and length parameters.
306 * We assume that length will aways be less that 100!
308 void machine_real_restart(const unsigned char *code, int length)
312 /* Write zero to CMOS register number 0x0f, which the BIOS POST
313 routine will recognize as telling it to do a proper reboot. (Well
314 that's what this book in front of me says -- it may only apply to
315 the Phoenix BIOS though, it's not clear). At the same time,
316 disable NMIs by setting the top bit in the CMOS address register,
317 as we're about to do peculiar things to the CPU. I'm not sure if
318 `outb_p' is needed instead of just `outb'. Use it to be on the
319 safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
321 spin_lock(&rtc_lock);
322 CMOS_WRITE(0x00, 0x8f);
323 spin_unlock(&rtc_lock);
325 /* Remap the kernel at virtual address zero, as well as offset zero
326 from the kernel segment. This assumes the kernel segment starts at
327 virtual address PAGE_OFFSET. */
328 memcpy(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
329 sizeof(swapper_pg_dir [0]) * KERNEL_PGD_PTRS);
332 * Use `swapper_pg_dir' as our page directory.
334 load_cr3(swapper_pg_dir);
336 /* Write 0x1234 to absolute memory location 0x472. The BIOS reads
337 this on booting to tell it to "Bypass memory test (also warm
338 boot)". This seems like a fairly standard thing that gets set by
339 REBOOT.COM programs, and the previous reset routine did this
341 *((unsigned short *)0x472) = reboot_mode;
343 /* For the switch to real mode, copy some code to low memory. It has
344 to be in the first 64k because it is running in 16-bit mode, and it
345 has to have the same physical and virtual address, because it turns
346 off paging. Copy it near the end of the first page, out of the way
347 of BIOS variables. */
348 memcpy((void *)(0x1000 - sizeof(real_mode_switch) - 100),
349 real_mode_switch, sizeof (real_mode_switch));
350 memcpy((void *)(0x1000 - 100), code, length);
352 /* Set up the IDT for real mode. */
353 load_idt(&real_mode_idt);
355 /* Set up a GDT from which we can load segment descriptors for real
356 mode. The GDT is not used in real mode; it is just needed here to
357 prepare the descriptors. */
358 load_gdt(&real_mode_gdt);
360 /* Load the data segment registers, and thus the descriptors ready for
361 real mode. The base address of each segment is 0x100, 16 times the
362 selector value being loaded here. This is so that the segment
363 registers don't have to be reloaded after switching to real mode:
364 the values are consistent for real mode operation already. */
365 __asm__ __volatile__ ("movl $0x0010,%%eax\n"
366 "\tmovl %%eax,%%ds\n"
367 "\tmovl %%eax,%%es\n"
368 "\tmovl %%eax,%%fs\n"
369 "\tmovl %%eax,%%gs\n"
370 "\tmovl %%eax,%%ss" : : : "eax");
372 /* Jump to the 16-bit code that we copied earlier. It disables paging
373 and the cache, switches to real mode, and jumps to the BIOS reset
375 __asm__ __volatile__ ("ljmp $0x0008,%0"
377 : "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
379 #ifdef CONFIG_APM_MODULE
380 EXPORT_SYMBOL(machine_real_restart);
383 #endif /* CONFIG_X86_32 */
385 static inline void kb_wait(void)
389 for (i = 0; i < 0x10000; i++) {
390 if ((inb(0x64) & 0x02) == 0)
396 void __attribute__((weak)) mach_reboot_fixups(void)
400 static void native_machine_emergency_restart(void)
404 /* Tell the BIOS if we want cold or warm reboot */
405 *((unsigned short *)__va(0x472)) = reboot_mode;
408 /* Could also try the reset bit in the Hammer NB */
409 switch (reboot_type) {
411 mach_reboot_fixups(); /* for board specific fixups */
413 for (i = 0; i < 10; i++) {
416 outb(0xfe, 0x64); /* pulse reset low */
422 __asm__ __volatile__("int3");
424 reboot_type = BOOT_KBD;
429 machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
431 reboot_type = BOOT_KBD;
437 reboot_type = BOOT_KBD;
443 efi.reset_system(reboot_mode ? EFI_RESET_WARM : EFI_RESET_COLD,
444 EFI_SUCCESS, 0, NULL);
446 reboot_type = BOOT_KBD;
452 void native_machine_shutdown(void)
454 /* Stop the cpus and apics */
457 /* The boot cpu is always logical cpu 0 */
458 int reboot_cpu_id = 0;
461 /* See if there has been given a command line override */
462 if ((reboot_cpu != -1) && (reboot_cpu < NR_CPUS) &&
463 cpu_online(reboot_cpu))
464 reboot_cpu_id = reboot_cpu;
467 /* Make certain the cpu I'm about to reboot on is online */
468 if (!cpu_online(reboot_cpu_id))
469 reboot_cpu_id = smp_processor_id();
471 /* Make certain I only run on the appropriate processor */
472 set_cpus_allowed_ptr(current, &cpumask_of_cpu(reboot_cpu_id));
474 /* O.K Now that I'm on the appropriate processor,
475 * stop all of the others.
482 #ifdef CONFIG_X86_IO_APIC
486 #ifdef CONFIG_HPET_TIMER
491 pci_iommu_shutdown();
495 static void native_machine_restart(char *__unused)
497 printk("machine restart\n");
501 machine_emergency_restart();
504 static void native_machine_halt(void)
508 static void native_machine_power_off(void)
517 struct machine_ops machine_ops = {
518 .power_off = native_machine_power_off,
519 .shutdown = native_machine_shutdown,
520 .emergency_restart = native_machine_emergency_restart,
521 .restart = native_machine_restart,
522 .halt = native_machine_halt,
524 .crash_shutdown = native_machine_crash_shutdown,
528 void machine_power_off(void)
530 machine_ops.power_off();
533 void machine_shutdown(void)
535 machine_ops.shutdown();
538 void machine_emergency_restart(void)
540 machine_ops.emergency_restart();
543 void machine_restart(char *cmd)
545 machine_ops.restart(cmd);
548 void machine_halt(void)
554 void machine_crash_shutdown(struct pt_regs *regs)
556 machine_ops.crash_shutdown(regs);