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cf13f0ea HC |
1 | /* |
2 | * arch/s390/kernel/machine_kexec.c | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2005 | |
5 | * | |
6 | * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com> | |
7 | * | |
8 | */ | |
9 | ||
10 | /* | |
11 | * s390_machine_kexec.c - handle the transition of Linux booting another kernel | |
12 | * on the S390 architecture. | |
13 | */ | |
14 | ||
15 | #include <asm/cio.h> | |
16 | #include <asm/setup.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/kexec.h> | |
20 | #include <linux/delay.h> | |
21 | #include <asm/pgtable.h> | |
22 | #include <asm/pgalloc.h> | |
23 | #include <asm/system.h> | |
24 | ||
25 | static void kexec_halt_all_cpus(void *); | |
26 | ||
27 | typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long); | |
28 | ||
29 | const extern unsigned char relocate_kernel[]; | |
30 | const extern unsigned long long relocate_kernel_len; | |
31 | ||
32 | int | |
33 | machine_kexec_prepare(struct kimage *image) | |
34 | { | |
35 | unsigned long reboot_code_buffer; | |
36 | ||
37 | /* We don't support anything but the default image type for now. */ | |
38 | if (image->type != KEXEC_TYPE_DEFAULT) | |
39 | return -EINVAL; | |
40 | ||
41 | /* Get the destination where the assembler code should be copied to.*/ | |
42 | reboot_code_buffer = page_to_pfn(image->control_code_page)<<PAGE_SHIFT; | |
43 | ||
44 | /* Then copy it */ | |
45 | memcpy((void *) reboot_code_buffer, relocate_kernel, | |
46 | relocate_kernel_len); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | void | |
51 | machine_kexec_cleanup(struct kimage *image) | |
52 | { | |
53 | } | |
54 | ||
55 | void | |
56 | machine_shutdown(void) | |
57 | { | |
58 | printk(KERN_INFO "kexec: machine_shutdown called\n"); | |
59 | } | |
60 | ||
61 | NORET_TYPE void | |
62 | machine_kexec(struct kimage *image) | |
63 | { | |
64 | clear_all_subchannels(); | |
65 | ||
66 | /* Disable lowcore protection */ | |
67 | ctl_clear_bit(0,28); | |
68 | ||
69 | on_each_cpu(kexec_halt_all_cpus, image, 0, 0); | |
70 | for(;;); | |
71 | } | |
72 | ||
73 | static void | |
74 | kexec_halt_all_cpus(void *kernel_image) | |
75 | { | |
76 | static atomic_t cpuid = ATOMIC_INIT(-1); | |
77 | int cpu; | |
78 | struct kimage *image; | |
79 | relocate_kernel_t data_mover; | |
80 | ||
81 | if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid)) | |
82 | signal_processor(smp_processor_id(), sigp_stop); | |
83 | ||
84 | /* Wait for all other cpus to enter stopped state */ | |
85 | for_each_online_cpu(cpu) { | |
86 | if (cpu == smp_processor_id()) | |
87 | continue; | |
88 | while(!smp_cpu_not_running(cpu)) | |
89 | cpu_relax(); | |
90 | } | |
91 | ||
92 | image = (struct kimage *) kernel_image; | |
93 | data_mover = (relocate_kernel_t) | |
94 | (page_to_pfn(image->control_code_page) << PAGE_SHIFT); | |
95 | ||
96 | /* Call the moving routine */ | |
97 | (*data_mover) (&image->head, image->start); | |
98 | } |