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update offsets to new european GB kernel, set software booting from USB
[ms2-kexec] / machine_kexec.c
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 void v7_flush_kern_cache_all(void);
22
23 extern unsigned long kexec_start_address;
24 extern unsigned long kexec_indirection_page;
25 extern unsigned long kexec_mach_type;
26 extern unsigned long kexec_boot_atags;
27
28 static atomic_t waiting_for_crash_ipi;
29
30 /*
31 * Provide a dummy crash_notes definition while crash dump arrives to arm.
32 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
33 */
34
35 int machine_kexec_prepare(struct kimage *image)
36 {
37 return 0;
38 }
39
40 void machine_kexec_cleanup(struct kimage *image)
41 {
42 }
43
44 void machine_crash_nonpanic_core(void *unused)
45 {
46 struct pt_regs regs;
47
48 crash_setup_regs(&regs, NULL);
49 printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
50 smp_processor_id());
51 crash_save_cpu(&regs, smp_processor_id());
52 v7_flush_kern_cache_all();
53
54 atomic_dec(&waiting_for_crash_ipi);
55 while (1)
56 cpu_relax();
57 }
58
59 void machine_crash_shutdown(struct pt_regs *regs)
60 {
61 unsigned long msecs;
62
63 local_irq_disable();
64
65 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
66 smp_call_function(machine_crash_nonpanic_core, NULL, false);
67 msecs = 1000; /* Wait at most a second for the other cpus to stop */
68 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
69 mdelay(1);
70 msecs--;
71 }
72 if (atomic_read(&waiting_for_crash_ipi) > 0)
73 printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
74
75 crash_save_cpu(regs, smp_processor_id());
76
77 printk(KERN_INFO "Loading crashdump kernel...\n");
78 }
79
80 /*
81 * Function pointer to optional machine-specific reinitialization
82 */
83 void (*kexec_reinit)(void);
84
85 void machine_kexec(struct kimage *image)
86 {
87 unsigned long page_list;
88 unsigned long reboot_code_buffer_phys;
89 void *reboot_code_buffer;
90
91 page_list = image->head & PAGE_MASK;
92
93 /* we need both effective and real address here */
94 reboot_code_buffer_phys =
95 page_to_pfn(image->control_code_page) << PAGE_SHIFT;
96 reboot_code_buffer = page_address(image->control_code_page);
97
98 /* Prepare parameters for reboot_code_buffer*/
99 kexec_start_address = image->start;
100 kexec_indirection_page = page_list;
101 kexec_mach_type = machine_arch_type;
102 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
103
104 /* copy our kernel relocation code to the control code page */
105 memcpy(reboot_code_buffer,
106 relocate_new_kernel, relocate_new_kernel_size);
107
108
109 flush_icache_range((unsigned long) reboot_code_buffer,
110 (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
111 printk(KERN_INFO "Bye!\n");
112
113 if (kexec_reinit)
114 kexec_reinit();
115 local_irq_disable();
116 local_fiq_disable();
117 setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
118 v7_flush_kern_cache_all();
119 #ifdef CONFIG_OUTER_CACHE
120 outer_flush_all();
121 outer_disable();
122 #endif
123 cpu_proc_fin();
124 #ifdef CONFIG_OUTER_CACHE
125 outer_inv_all();
126 #endif
127 //v7_flush_kern_cache_all();
128 cpu_reset(reboot_code_buffer_phys);
129 }
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