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Commit | Line | Data |
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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> |
9141a003 | 10 | #include <linux/irq.h> |
c587e4a6 RP |
11 | #include <asm/pgtable.h> |
12 | #include <asm/pgalloc.h> | |
13 | #include <asm/mmu_context.h> | |
c587e4a6 RP |
14 | #include <asm/cacheflush.h> |
15 | #include <asm/mach-types.h> | |
9f97da78 | 16 | #include <asm/system_misc.h> |
c587e4a6 | 17 | |
e0fc4f97 TK |
18 | extern const unsigned char relocate_new_kernel[]; |
19 | extern const unsigned int relocate_new_kernel_size; | |
c587e4a6 | 20 | |
c587e4a6 RP |
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 | { | |
35 | return 0; | |
36 | } | |
37 | ||
38 | void machine_kexec_cleanup(struct kimage *image) | |
39 | { | |
40 | } | |
41 | ||
b2306531 PF |
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 | ||
9141a003 WD |
57 | static void machine_kexec_mask_interrupts(void) |
58 | { | |
59 | unsigned int i; | |
60 | struct irq_desc *desc; | |
61 | ||
62 | for_each_irq_desc(i, desc) { | |
63 | struct irq_chip *chip; | |
64 | ||
65 | chip = irq_desc_get_chip(desc); | |
66 | if (!chip) | |
67 | continue; | |
68 | ||
69 | if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) | |
70 | chip->irq_eoi(&desc->irq_data); | |
71 | ||
72 | if (chip->irq_mask) | |
73 | chip->irq_mask(&desc->irq_data); | |
74 | ||
75 | if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) | |
76 | chip->irq_disable(&desc->irq_data); | |
77 | } | |
78 | } | |
79 | ||
c587e4a6 RP |
80 | void machine_crash_shutdown(struct pt_regs *regs) |
81 | { | |
b2306531 PF |
82 | unsigned long msecs; |
83 | ||
c6383620 | 84 | local_irq_disable(); |
b2306531 PF |
85 | |
86 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
87 | smp_call_function(machine_crash_nonpanic_core, NULL, false); | |
88 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
89 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
90 | mdelay(1); | |
91 | msecs--; | |
92 | } | |
93 | if (atomic_read(&waiting_for_crash_ipi) > 0) | |
94 | printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n"); | |
95 | ||
c6383620 | 96 | crash_save_cpu(regs, smp_processor_id()); |
9141a003 | 97 | machine_kexec_mask_interrupts(); |
c6383620 MW |
98 | |
99 | printk(KERN_INFO "Loading crashdump kernel...\n"); | |
c587e4a6 RP |
100 | } |
101 | ||
868d172b EC |
102 | /* |
103 | * Function pointer to optional machine-specific reinitialization | |
104 | */ | |
105 | void (*kexec_reinit)(void); | |
106 | ||
c587e4a6 RP |
107 | void machine_kexec(struct kimage *image) |
108 | { | |
abf015f0 | 109 | unsigned long page_list; |
c587e4a6 RP |
110 | unsigned long reboot_code_buffer_phys; |
111 | void *reboot_code_buffer; | |
112 | ||
abf015f0 RK |
113 | |
114 | page_list = image->head & PAGE_MASK; | |
115 | ||
c587e4a6 RP |
116 | /* we need both effective and real address here */ |
117 | reboot_code_buffer_phys = | |
118 | page_to_pfn(image->control_code_page) << PAGE_SHIFT; | |
119 | reboot_code_buffer = page_address(image->control_code_page); | |
120 | ||
abf015f0 RK |
121 | /* Prepare parameters for reboot_code_buffer*/ |
122 | kexec_start_address = image->start; | |
123 | kexec_indirection_page = page_list; | |
124 | kexec_mach_type = machine_arch_type; | |
125 | kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; | |
126 | ||
127 | /* copy our kernel relocation code to the control code page */ | |
128 | memcpy(reboot_code_buffer, | |
129 | relocate_new_kernel, relocate_new_kernel_size); | |
130 | ||
131 | ||
132 | flush_icache_range((unsigned long) reboot_code_buffer, | |
133 | (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); | |
c587e4a6 RP |
134 | printk(KERN_INFO "Bye!\n"); |
135 | ||
868d172b EC |
136 | if (kexec_reinit) |
137 | kexec_reinit(); | |
3bdc3484 WD |
138 | |
139 | soft_restart(reboot_code_buffer_phys); | |
c587e4a6 | 140 | } |