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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 | ||
69 | #ifdef CONFIG_SMP | |
70 | static void smp_halt(void) | |
71 | { | |
72 | int cpuid = safe_smp_processor_id(); | |
73 | static int first_entry = 1; | |
74 | ||
75 | if (reboot_force) | |
76 | return; | |
77 | ||
78 | if (first_entry) { | |
79 | first_entry = 0; | |
80 | smp_call_function((void *)machine_restart, NULL, 1, 0); | |
81 | } | |
82 | ||
83 | smp_stop_cpu(); | |
84 | ||
85 | /* AP calling this. Just halt */ | |
86 | if (cpuid != boot_cpu_id) { | |
87 | for (;;) | |
88 | asm("hlt"); | |
89 | } | |
90 | ||
91 | /* Wait for all other CPUs to have run smp_stop_cpu */ | |
92 | while (!cpus_empty(cpu_online_map)) | |
93 | rep_nop(); | |
94 | } | |
95 | #endif | |
96 | ||
97 | static inline void kb_wait(void) | |
98 | { | |
99 | int i; | |
100 | ||
101 | for (i=0; i<0x10000; i++) | |
102 | if ((inb_p(0x64) & 0x02) == 0) | |
103 | break; | |
104 | } | |
105 | ||
106 | void machine_restart(char * __unused) | |
107 | { | |
108 | int i; | |
109 | ||
110 | printk("machine restart\n"); | |
111 | ||
112 | #ifdef CONFIG_SMP | |
113 | smp_halt(); | |
114 | #endif | |
115 | ||
116 | if (!reboot_force) { | |
117 | local_irq_disable(); | |
118 | #ifndef CONFIG_SMP | |
119 | disable_local_APIC(); | |
120 | #endif | |
121 | disable_IO_APIC(); | |
122 | local_irq_enable(); | |
123 | } | |
124 | ||
125 | /* Tell the BIOS if we want cold or warm reboot */ | |
126 | *((unsigned short *)__va(0x472)) = reboot_mode; | |
127 | ||
128 | for (;;) { | |
129 | /* Could also try the reset bit in the Hammer NB */ | |
130 | switch (reboot_type) { | |
131 | case BOOT_KBD: | |
132 | for (i=0; i<100; i++) { | |
133 | kb_wait(); | |
134 | udelay(50); | |
135 | outb(0xfe,0x64); /* pulse reset low */ | |
136 | udelay(50); | |
137 | } | |
138 | ||
139 | case BOOT_TRIPLE: | |
140 | __asm__ __volatile__("lidt (%0)": :"r" (&no_idt)); | |
141 | __asm__ __volatile__("int3"); | |
142 | ||
143 | reboot_type = BOOT_KBD; | |
144 | break; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | EXPORT_SYMBOL(machine_restart); | |
150 | ||
151 | void machine_halt(void) | |
152 | { | |
153 | } | |
154 | ||
155 | EXPORT_SYMBOL(machine_halt); | |
156 | ||
157 | void machine_power_off(void) | |
158 | { | |
159 | if (pm_power_off) | |
160 | pm_power_off(); | |
161 | } | |
162 | ||
163 | EXPORT_SYMBOL(machine_power_off); |