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Commit | Line | Data |
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1 | /* | |
2 | * machine_kexec.c - handle transition of Linux booting another kernel | |
3 | */ | |
4 | ||
5 | #include <linux/mm.h> | |
6 | #include <linux/kexec.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/reboot.h> | |
9 | #include <linux/io.h> | |
10 | #include <asm/pgtable.h> | |
11 | #include <asm/pgalloc.h> | |
12 | #include <asm/mmu_context.h> | |
13 | #include <asm/cacheflush.h> | |
14 | #include <asm/mach-types.h> | |
15 | ||
16 | extern const unsigned char relocate_new_kernel[]; | |
17 | extern const unsigned int relocate_new_kernel_size; | |
18 | ||
19 | extern void setup_mm_for_reboot(char mode); | |
20 | ||
21 | extern unsigned long kexec_start_address; | |
22 | extern unsigned long kexec_indirection_page; | |
23 | extern unsigned long kexec_mach_type; | |
24 | extern unsigned long kexec_boot_atags; | |
25 | ||
26 | static atomic_t waiting_for_crash_ipi; | |
27 | ||
28 | /* | |
29 | * Provide a dummy crash_notes definition while crash dump arrives to arm. | |
30 | * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. | |
31 | */ | |
32 | ||
33 | int machine_kexec_prepare(struct kimage *image) | |
34 | { | |
35 | return 0; | |
36 | } | |
37 | ||
38 | void machine_kexec_cleanup(struct kimage *image) | |
39 | { | |
40 | } | |
41 | ||
42 | void machine_crash_nonpanic_core(void *unused) | |
43 | { | |
44 | struct pt_regs regs; | |
45 | ||
46 | crash_setup_regs(®s, NULL); | |
47 | printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", | |
48 | smp_processor_id()); | |
49 | crash_save_cpu(®s, smp_processor_id()); | |
50 | flush_cache_all(); | |
51 | ||
52 | atomic_dec(&waiting_for_crash_ipi); | |
53 | while (1) | |
54 | cpu_relax(); | |
55 | } | |
56 | ||
57 | void machine_crash_shutdown(struct pt_regs *regs) | |
58 | { | |
59 | unsigned long msecs; | |
60 | ||
61 | local_irq_disable(); | |
62 | ||
63 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
64 | smp_call_function(machine_crash_nonpanic_core, NULL, false); | |
65 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
66 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
67 | mdelay(1); | |
68 | msecs--; | |
69 | } | |
70 | if (atomic_read(&waiting_for_crash_ipi) > 0) | |
71 | printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n"); | |
72 | ||
73 | crash_save_cpu(regs, smp_processor_id()); | |
74 | ||
75 | printk(KERN_INFO "Loading crashdump kernel...\n"); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Function pointer to optional machine-specific reinitialization | |
80 | */ | |
81 | void (*kexec_reinit)(void); | |
82 | ||
83 | void machine_kexec(struct kimage *image) | |
84 | { | |
85 | unsigned long page_list; | |
86 | unsigned long reboot_code_buffer_phys; | |
87 | void *reboot_code_buffer; | |
88 | ||
89 | ||
90 | page_list = image->head & PAGE_MASK; | |
91 | ||
92 | /* we need both effective and real address here */ | |
93 | reboot_code_buffer_phys = | |
94 | page_to_pfn(image->control_code_page) << PAGE_SHIFT; | |
95 | reboot_code_buffer = page_address(image->control_code_page); | |
96 | ||
97 | /* Prepare parameters for reboot_code_buffer*/ | |
98 | kexec_start_address = image->start; | |
99 | kexec_indirection_page = page_list; | |
100 | kexec_mach_type = machine_arch_type; | |
101 | kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; | |
102 | ||
103 | /* copy our kernel relocation code to the control code page */ | |
104 | memcpy(reboot_code_buffer, | |
105 | relocate_new_kernel, relocate_new_kernel_size); | |
106 | ||
107 | ||
108 | flush_icache_range((unsigned long) reboot_code_buffer, | |
109 | (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); | |
110 | printk(KERN_INFO "Bye!\n"); | |
111 | ||
112 | if (kexec_reinit) | |
113 | kexec_reinit(); | |
114 | local_irq_disable(); | |
115 | local_fiq_disable(); | |
116 | setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/ | |
117 | flush_cache_all(); | |
118 | #ifdef CONFIG_OUTER_CACHE | |
119 | outer_flush_all(); | |
120 | outer_disable(); | |
121 | #endif | |
122 | cpu_proc_fin(); | |
123 | #ifdef CONFIG_OUTER_CACHE | |
124 | outer_inv_all(); | |
125 | #endif | |
126 | flush_cache_all(); | |
127 | cpu_reset(reboot_code_buffer_phys); | |
128 | } |