Commit | Line | Data |
---|---|---|
c587e4a6 RP |
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> | |
fced80c7 | 9 | #include <linux/io.h> |
c587e4a6 RP |
10 | #include <asm/pgtable.h> |
11 | #include <asm/pgalloc.h> | |
12 | #include <asm/mmu_context.h> | |
c587e4a6 RP |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/mach-types.h> | |
15 | ||
e0fc4f97 TK |
16 | extern const unsigned char relocate_new_kernel[]; |
17 | extern const unsigned int relocate_new_kernel_size; | |
c587e4a6 RP |
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; | |
4cd9d6f7 | 24 | extern unsigned long kexec_boot_atags; |
c587e4a6 | 25 | |
b2306531 PF |
26 | static atomic_t waiting_for_crash_ipi; |
27 | ||
c587e4a6 RP |
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 | { | |
2b034922 LW |
35 | unsigned long page_list; |
36 | void *reboot_code_buffer; | |
37 | page_list = image->head & PAGE_MASK; | |
38 | ||
39 | reboot_code_buffer = page_address(image->control_code_page); | |
40 | ||
41 | /* Prepare parameters for reboot_code_buffer*/ | |
42 | kexec_start_address = image->start; | |
43 | kexec_indirection_page = page_list; | |
44 | kexec_mach_type = machine_arch_type; | |
45 | kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; | |
46 | ||
47 | /* copy our kernel relocation code to the control code page */ | |
48 | memcpy(reboot_code_buffer, | |
49 | relocate_new_kernel, relocate_new_kernel_size); | |
50 | ||
51 | flush_icache_range((unsigned long) reboot_code_buffer, | |
52 | (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); | |
c587e4a6 RP |
53 | return 0; |
54 | } | |
55 | ||
56 | void machine_kexec_cleanup(struct kimage *image) | |
57 | { | |
58 | } | |
59 | ||
b2306531 PF |
60 | void machine_crash_nonpanic_core(void *unused) |
61 | { | |
62 | struct pt_regs regs; | |
63 | ||
64 | crash_setup_regs(®s, NULL); | |
65 | printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", | |
66 | smp_processor_id()); | |
67 | crash_save_cpu(®s, smp_processor_id()); | |
68 | flush_cache_all(); | |
69 | ||
70 | atomic_dec(&waiting_for_crash_ipi); | |
71 | while (1) | |
72 | cpu_relax(); | |
73 | } | |
74 | ||
c587e4a6 RP |
75 | void machine_crash_shutdown(struct pt_regs *regs) |
76 | { | |
b2306531 PF |
77 | unsigned long msecs; |
78 | ||
c6383620 | 79 | local_irq_disable(); |
b2306531 PF |
80 | |
81 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
82 | smp_call_function(machine_crash_nonpanic_core, NULL, false); | |
83 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
84 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
85 | mdelay(1); | |
86 | msecs--; | |
87 | } | |
88 | if (atomic_read(&waiting_for_crash_ipi) > 0) | |
89 | printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n"); | |
90 | ||
c6383620 MW |
91 | crash_save_cpu(regs, smp_processor_id()); |
92 | ||
93 | printk(KERN_INFO "Loading crashdump kernel...\n"); | |
c587e4a6 RP |
94 | } |
95 | ||
868d172b EC |
96 | /* |
97 | * Function pointer to optional machine-specific reinitialization | |
98 | */ | |
99 | void (*kexec_reinit)(void); | |
100 | ||
c587e4a6 RP |
101 | void machine_kexec(struct kimage *image) |
102 | { | |
c587e4a6 RP |
103 | unsigned long reboot_code_buffer_phys; |
104 | void *reboot_code_buffer; | |
105 | ||
c587e4a6 RP |
106 | /* we need both effective and real address here */ |
107 | reboot_code_buffer_phys = | |
108 | page_to_pfn(image->control_code_page) << PAGE_SHIFT; | |
109 | reboot_code_buffer = page_address(image->control_code_page); | |
110 | ||
c587e4a6 RP |
111 | printk(KERN_INFO "Bye!\n"); |
112 | ||
868d172b EC |
113 | if (kexec_reinit) |
114 | kexec_reinit(); | |
9ca03a21 RK |
115 | local_irq_disable(); |
116 | local_fiq_disable(); | |
c587e4a6 | 117 | setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/ |
9ca03a21 | 118 | flush_cache_all(); |
ae360a78 TG |
119 | outer_flush_all(); |
120 | outer_disable(); | |
9ca03a21 | 121 | cpu_proc_fin(); |
ae360a78 | 122 | outer_inv_all(); |
9ca03a21 | 123 | flush_cache_all(); |
c587e4a6 RP |
124 | cpu_reset(reboot_code_buffer_phys); |
125 | } |