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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
16extern const unsigned char relocate_new_kernel[];
17extern const unsigned int relocate_new_kernel_size;
18
19extern void setup_mm_for_reboot(char mode);
20
21extern unsigned long kexec_start_address;
22extern unsigned long kexec_indirection_page;
23extern unsigned long kexec_mach_type;
24extern unsigned long kexec_boot_atags;
25
26static 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
33int machine_kexec_prepare(struct kimage *image)
34{
35 return 0;
36}
37
38void machine_kexec_cleanup(struct kimage *image)
39{
40}
41
42void 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
57void 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 */
81void (*kexec_reinit)(void);
82
83void 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 outer_flush_all();
119 outer_disable();
120 cpu_proc_fin();
121 outer_inv_all();
122 flush_cache_all();
123 cpu_reset(reboot_code_buffer_phys);
124}
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 <linux/irq.h>
11#include <asm/pgtable.h>
12#include <asm/pgalloc.h>
13#include <asm/mmu_context.h>
14#include <asm/cacheflush.h>
15#include <asm/mach-types.h>
16#include <asm/system_misc.h>
17
18extern const unsigned char relocate_new_kernel[];
19extern const unsigned int relocate_new_kernel_size;
20
21extern unsigned long kexec_start_address;
22extern unsigned long kexec_indirection_page;
23extern unsigned long kexec_mach_type;
24extern unsigned long kexec_boot_atags;
25
26static 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
33int machine_kexec_prepare(struct kimage *image)
34{
35 return 0;
36}
37
38void machine_kexec_cleanup(struct kimage *image)
39{
40}
41
42void 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
57static 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
80void machine_crash_shutdown(struct pt_regs *regs)
81{
82 unsigned long msecs;
83
84 local_irq_disable();
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
96 crash_save_cpu(regs, smp_processor_id());
97 machine_kexec_mask_interrupts();
98
99 printk(KERN_INFO "Loading crashdump kernel...\n");
100}
101
102/*
103 * Function pointer to optional machine-specific reinitialization
104 */
105void (*kexec_reinit)(void);
106
107void machine_kexec(struct kimage *image)
108{
109 unsigned long page_list;
110 unsigned long reboot_code_buffer_phys;
111 void *reboot_code_buffer;
112
113
114 page_list = image->head & PAGE_MASK;
115
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
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);
134 printk(KERN_INFO "Bye!\n");
135
136 if (kexec_reinit)
137 kexec_reinit();
138
139 soft_restart(reboot_code_buffer_phys);
140}