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> | |
9 | #include <asm/io.h> | |
10 | #include <asm/kdebug.h> | |
11 | #include <asm/delay.h> | |
12 | #include <asm/hw_irq.h> | |
13 | #include <asm/system.h> | |
14 | #include <asm/pgtable.h> | |
15 | #include <asm/tlbflush.h> | |
16 | #include <asm/apic.h> | |
17 | ||
18 | /* | |
19 | * Power off function, if any | |
20 | */ | |
21 | void (*pm_power_off)(void); | |
22 | ||
23 | static long no_idt[3]; | |
24 | static enum { | |
25 | BOOT_TRIPLE = 't', | |
26 | BOOT_KBD = 'k' | |
27 | } reboot_type = BOOT_KBD; | |
28 | static int reboot_mode = 0; | |
29 | int reboot_force; | |
30 | ||
31 | /* reboot=t[riple] | k[bd] [, [w]arm | [c]old] | |
32 | warm Don't set the cold reboot flag | |
33 | cold Set the cold reboot flag | |
34 | triple Force a triple fault (init) | |
35 | kbd Use the keyboard controller. cold reset (default) | |
36 | force Avoid anything that could hang. | |
37 | */ | |
38 | static int __init reboot_setup(char *str) | |
39 | { | |
40 | for (;;) { | |
41 | switch (*str) { | |
42 | case 'w': | |
43 | reboot_mode = 0x1234; | |
44 | break; | |
45 | ||
46 | case 'c': | |
47 | reboot_mode = 0; | |
48 | break; | |
49 | ||
50 | case 't': | |
51 | case 'b': | |
52 | case 'k': | |
53 | reboot_type = *str; | |
54 | break; | |
55 | case 'f': | |
56 | reboot_force = 1; | |
57 | break; | |
58 | } | |
59 | if((str = strchr(str,',')) != NULL) | |
60 | str++; | |
61 | else | |
62 | break; | |
63 | } | |
64 | return 1; | |
65 | } | |
66 | ||
67 | __setup("reboot=", reboot_setup); | |
68 | ||
d8955958 | 69 | static inline void kb_wait(void) |
1da177e4 | 70 | { |
d8955958 | 71 | int i; |
1da177e4 | 72 | |
d8955958 EB |
73 | for (i=0; i<0x10000; i++) |
74 | if ((inb_p(0x64) & 0x02) == 0) | |
75 | break; | |
76 | } | |
1da177e4 | 77 | |
d8955958 EB |
78 | void machine_shutdown(void) |
79 | { | |
80 | /* Stop the cpus and apics */ | |
81 | #ifdef CONFIG_SMP | |
82 | int reboot_cpu_id; | |
1da177e4 | 83 | |
d8955958 EB |
84 | /* The boot cpu is always logical cpu 0 */ |
85 | reboot_cpu_id = 0; | |
86 | ||
87 | /* Make certain the cpu I'm about to reboot on is online */ | |
88 | if (!cpu_isset(reboot_cpu_id, cpu_online_map)) { | |
89 | reboot_cpu_id = smp_processor_id(); | |
1da177e4 LT |
90 | } |
91 | ||
d8955958 EB |
92 | /* Make certain I only run on the appropriate processor */ |
93 | set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id)); | |
94 | ||
95 | /* O.K Now that I'm on the appropriate processor, | |
96 | * stop all of the others. | |
97 | */ | |
98 | smp_send_stop(); | |
1da177e4 LT |
99 | #endif |
100 | ||
d8955958 | 101 | local_irq_disable(); |
1da177e4 | 102 | |
d8955958 EB |
103 | #ifndef CONFIG_SMP |
104 | disable_local_APIC(); | |
105 | #endif | |
106 | ||
107 | disable_IO_APIC(); | |
108 | ||
109 | local_irq_enable(); | |
1da177e4 LT |
110 | } |
111 | ||
62b3a04d | 112 | void machine_emergency_restart(void) |
1da177e4 LT |
113 | { |
114 | int i; | |
115 | ||
1da177e4 LT |
116 | /* Tell the BIOS if we want cold or warm reboot */ |
117 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
118 | ||
119 | for (;;) { | |
120 | /* Could also try the reset bit in the Hammer NB */ | |
121 | switch (reboot_type) { | |
122 | case BOOT_KBD: | |
123 | for (i=0; i<100; i++) { | |
124 | kb_wait(); | |
125 | udelay(50); | |
126 | outb(0xfe,0x64); /* pulse reset low */ | |
127 | udelay(50); | |
128 | } | |
129 | ||
130 | case BOOT_TRIPLE: | |
131 | __asm__ __volatile__("lidt (%0)": :"r" (&no_idt)); | |
132 | __asm__ __volatile__("int3"); | |
133 | ||
134 | reboot_type = BOOT_KBD; | |
135 | break; | |
136 | } | |
137 | } | |
138 | } | |
139 | ||
62b3a04d EB |
140 | void machine_restart(char * __unused) |
141 | { | |
142 | printk("machine restart\n"); | |
143 | ||
144 | if (!reboot_force) { | |
145 | machine_shutdown(); | |
146 | } | |
147 | machine_emergency_restart(); | |
148 | } | |
149 | ||
1da177e4 LT |
150 | void machine_halt(void) |
151 | { | |
152 | } | |
153 | ||
1da177e4 LT |
154 | void machine_power_off(void) |
155 | { | |
0963aba5 EB |
156 | if (!reboot_force) { |
157 | machine_shutdown(); | |
158 | } | |
1da177e4 LT |
159 | if (pm_power_off) |
160 | pm_power_off(); | |
161 | } | |
162 |