Commit | Line | Data |
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1da177e4 LT |
1 | /* Various gunk just to reboot the machine. */ |
2 | #include <linux/module.h> | |
3 | #include <linux/reboot.h> | |
4 | #include <linux/init.h> | |
5 | #include <linux/smp.h> | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/ctype.h> | |
8 | #include <linux/string.h> | |
6e3fbee5 | 9 | #include <linux/pm.h> |
1eeb66a1 | 10 | #include <linux/kdebug.h> |
e8edc6e0 | 11 | #include <linux/sched.h> |
de18c850 | 12 | #include <linux/efi.h> |
fa20efd2 | 13 | #include <acpi/reboot.h> |
1da177e4 | 14 | #include <asm/io.h> |
1da177e4 | 15 | #include <asm/delay.h> |
9d1c6e7c | 16 | #include <asm/desc.h> |
1da177e4 LT |
17 | #include <asm/hw_irq.h> |
18 | #include <asm/system.h> | |
19 | #include <asm/pgtable.h> | |
20 | #include <asm/tlbflush.h> | |
21 | #include <asm/apic.h> | |
c86c7fbc | 22 | #include <asm/hpet.h> |
395624fc | 23 | #include <asm/gart.h> |
1da177e4 LT |
24 | |
25 | /* | |
26 | * Power off function, if any | |
27 | */ | |
28 | void (*pm_power_off)(void); | |
2ee60e17 | 29 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
30 | |
31 | static long no_idt[3]; | |
de18c850 | 32 | enum reboot_type reboot_type = BOOT_KBD; |
1da177e4 LT |
33 | static int reboot_mode = 0; |
34 | int reboot_force; | |
35 | ||
de18c850 | 36 | /* reboot=t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] |
1da177e4 LT |
37 | warm Don't set the cold reboot flag |
38 | cold Set the cold reboot flag | |
39 | triple Force a triple fault (init) | |
40 | kbd Use the keyboard controller. cold reset (default) | |
fa20efd2 | 41 | acpi Use the RESET_REG in the FADT |
de18c850 | 42 | efi Use efi reset_system runtime service |
1da177e4 LT |
43 | force Avoid anything that could hang. |
44 | */ | |
45 | static int __init reboot_setup(char *str) | |
46 | { | |
47 | for (;;) { | |
48 | switch (*str) { | |
49 | case 'w': | |
50 | reboot_mode = 0x1234; | |
51 | break; | |
52 | ||
53 | case 'c': | |
54 | reboot_mode = 0; | |
55 | break; | |
56 | ||
57 | case 't': | |
fa20efd2 | 58 | case 'a': |
1da177e4 LT |
59 | case 'b': |
60 | case 'k': | |
de18c850 | 61 | case 'e': |
1da177e4 LT |
62 | reboot_type = *str; |
63 | break; | |
64 | case 'f': | |
65 | reboot_force = 1; | |
66 | break; | |
67 | } | |
68 | if((str = strchr(str,',')) != NULL) | |
69 | str++; | |
70 | else | |
71 | break; | |
72 | } | |
73 | return 1; | |
74 | } | |
75 | ||
76 | __setup("reboot=", reboot_setup); | |
77 | ||
d8955958 | 78 | static inline void kb_wait(void) |
1da177e4 | 79 | { |
d8955958 | 80 | int i; |
1da177e4 | 81 | |
d8955958 EB |
82 | for (i=0; i<0x10000; i++) |
83 | if ((inb_p(0x64) & 0x02) == 0) | |
84 | break; | |
85 | } | |
1da177e4 | 86 | |
d8955958 EB |
87 | void machine_shutdown(void) |
88 | { | |
3506229f | 89 | unsigned long flags; |
bc2cea6a | 90 | |
d8955958 EB |
91 | /* Stop the cpus and apics */ |
92 | #ifdef CONFIG_SMP | |
93 | int reboot_cpu_id; | |
1da177e4 | 94 | |
d8955958 EB |
95 | /* The boot cpu is always logical cpu 0 */ |
96 | reboot_cpu_id = 0; | |
97 | ||
98 | /* Make certain the cpu I'm about to reboot on is online */ | |
99 | if (!cpu_isset(reboot_cpu_id, cpu_online_map)) { | |
100 | reboot_cpu_id = smp_processor_id(); | |
1da177e4 LT |
101 | } |
102 | ||
d8955958 EB |
103 | /* Make certain I only run on the appropriate processor */ |
104 | set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id)); | |
105 | ||
106 | /* O.K Now that I'm on the appropriate processor, | |
107 | * stop all of the others. | |
108 | */ | |
109 | smp_send_stop(); | |
1da177e4 LT |
110 | #endif |
111 | ||
3506229f | 112 | local_irq_save(flags); |
1da177e4 | 113 | |
d8955958 EB |
114 | #ifndef CONFIG_SMP |
115 | disable_local_APIC(); | |
116 | #endif | |
117 | ||
118 | disable_IO_APIC(); | |
119 | ||
c86c7fbc OH |
120 | #ifdef CONFIG_HPET_TIMER |
121 | hpet_disable(); | |
122 | #endif | |
3506229f | 123 | local_irq_restore(flags); |
bc2cea6a YL |
124 | |
125 | pci_iommu_shutdown(); | |
1da177e4 LT |
126 | } |
127 | ||
62b3a04d | 128 | void machine_emergency_restart(void) |
1da177e4 LT |
129 | { |
130 | int i; | |
131 | ||
1da177e4 LT |
132 | /* Tell the BIOS if we want cold or warm reboot */ |
133 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
134 | ||
135 | for (;;) { | |
136 | /* Could also try the reset bit in the Hammer NB */ | |
137 | switch (reboot_type) { | |
138 | case BOOT_KBD: | |
a6f5deb2 | 139 | for (i=0; i<10; i++) { |
1da177e4 LT |
140 | kb_wait(); |
141 | udelay(50); | |
142 | outb(0xfe,0x64); /* pulse reset low */ | |
143 | udelay(50); | |
144 | } | |
145 | ||
146 | case BOOT_TRIPLE: | |
9d1c6e7c | 147 | load_idt((const struct desc_ptr *)&no_idt); |
1da177e4 LT |
148 | __asm__ __volatile__("int3"); |
149 | ||
150 | reboot_type = BOOT_KBD; | |
151 | break; | |
fa20efd2 AD |
152 | |
153 | case BOOT_ACPI: | |
154 | acpi_reboot(); | |
155 | reboot_type = BOOT_KBD; | |
156 | break; | |
de18c850 HY |
157 | |
158 | case BOOT_EFI: | |
159 | if (efi_enabled) | |
160 | efi.reset_system(reboot_mode ? EFI_RESET_WARM : EFI_RESET_COLD, | |
161 | EFI_SUCCESS, 0, NULL); | |
162 | reboot_type = BOOT_KBD; | |
163 | break; | |
164 | } | |
1da177e4 LT |
165 | } |
166 | } | |
167 | ||
62b3a04d EB |
168 | void machine_restart(char * __unused) |
169 | { | |
170 | printk("machine restart\n"); | |
171 | ||
172 | if (!reboot_force) { | |
173 | machine_shutdown(); | |
174 | } | |
175 | machine_emergency_restart(); | |
176 | } | |
177 | ||
1da177e4 LT |
178 | void machine_halt(void) |
179 | { | |
180 | } | |
181 | ||
1da177e4 LT |
182 | void machine_power_off(void) |
183 | { | |
6e3fbee5 EB |
184 | if (pm_power_off) { |
185 | if (!reboot_force) { | |
186 | machine_shutdown(); | |
187 | } | |
1da177e4 | 188 | pm_power_off(); |
6e3fbee5 | 189 | } |
1da177e4 LT |
190 | } |
191 |