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> | |
3bdc3484 | 15 | #include <asm/system.h> |
c587e4a6 | 16 | |
e0fc4f97 TK |
17 | extern const unsigned char relocate_new_kernel[]; |
18 | extern const unsigned int relocate_new_kernel_size; | |
c587e4a6 | 19 | |
c587e4a6 RP |
20 | extern unsigned long kexec_start_address; |
21 | extern unsigned long kexec_indirection_page; | |
22 | extern unsigned long kexec_mach_type; | |
4cd9d6f7 | 23 | extern unsigned long kexec_boot_atags; |
c587e4a6 | 24 | |
b2306531 PF |
25 | static atomic_t waiting_for_crash_ipi; |
26 | ||
c587e4a6 RP |
27 | /* |
28 | * Provide a dummy crash_notes definition while crash dump arrives to arm. | |
29 | * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. | |
30 | */ | |
31 | ||
32 | int machine_kexec_prepare(struct kimage *image) | |
33 | { | |
34 | return 0; | |
35 | } | |
36 | ||
37 | void machine_kexec_cleanup(struct kimage *image) | |
38 | { | |
39 | } | |
40 | ||
b2306531 PF |
41 | void machine_crash_nonpanic_core(void *unused) |
42 | { | |
43 | struct pt_regs regs; | |
44 | ||
45 | crash_setup_regs(®s, NULL); | |
46 | printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", | |
47 | smp_processor_id()); | |
48 | crash_save_cpu(®s, smp_processor_id()); | |
49 | flush_cache_all(); | |
50 | ||
51 | atomic_dec(&waiting_for_crash_ipi); | |
52 | while (1) | |
53 | cpu_relax(); | |
54 | } | |
55 | ||
c587e4a6 RP |
56 | void machine_crash_shutdown(struct pt_regs *regs) |
57 | { | |
b2306531 PF |
58 | unsigned long msecs; |
59 | ||
c6383620 | 60 | local_irq_disable(); |
b2306531 PF |
61 | |
62 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
63 | smp_call_function(machine_crash_nonpanic_core, NULL, false); | |
64 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
65 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
66 | mdelay(1); | |
67 | msecs--; | |
68 | } | |
69 | if (atomic_read(&waiting_for_crash_ipi) > 0) | |
70 | printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n"); | |
71 | ||
c6383620 MW |
72 | crash_save_cpu(regs, smp_processor_id()); |
73 | ||
74 | printk(KERN_INFO "Loading crashdump kernel...\n"); | |
c587e4a6 RP |
75 | } |
76 | ||
868d172b EC |
77 | /* |
78 | * Function pointer to optional machine-specific reinitialization | |
79 | */ | |
80 | void (*kexec_reinit)(void); | |
81 | ||
c587e4a6 RP |
82 | void machine_kexec(struct kimage *image) |
83 | { | |
abf015f0 | 84 | unsigned long page_list; |
c587e4a6 RP |
85 | unsigned long reboot_code_buffer_phys; |
86 | void *reboot_code_buffer; | |
87 | ||
abf015f0 RK |
88 | |
89 | page_list = image->head & PAGE_MASK; | |
90 | ||
c587e4a6 RP |
91 | /* we need both effective and real address here */ |
92 | reboot_code_buffer_phys = | |
93 | page_to_pfn(image->control_code_page) << PAGE_SHIFT; | |
94 | reboot_code_buffer = page_address(image->control_code_page); | |
95 | ||
abf015f0 RK |
96 | /* Prepare parameters for reboot_code_buffer*/ |
97 | kexec_start_address = image->start; | |
98 | kexec_indirection_page = page_list; | |
99 | kexec_mach_type = machine_arch_type; | |
100 | kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; | |
101 | ||
102 | /* copy our kernel relocation code to the control code page */ | |
103 | memcpy(reboot_code_buffer, | |
104 | relocate_new_kernel, relocate_new_kernel_size); | |
105 | ||
106 | ||
107 | flush_icache_range((unsigned long) reboot_code_buffer, | |
108 | (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); | |
c587e4a6 RP |
109 | printk(KERN_INFO "Bye!\n"); |
110 | ||
868d172b EC |
111 | if (kexec_reinit) |
112 | kexec_reinit(); | |
3bdc3484 WD |
113 | |
114 | soft_restart(reboot_code_buffer_phys); | |
c587e4a6 | 115 | } |