Commit | Line | Data |
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3d1229d6 ME |
1 | /* |
2 | * Code to handle transition of Linux booting another kernel. | |
3 | * | |
4 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> | |
5 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz | |
6 | * Copyright (C) 2005 IBM Corporation. | |
7 | * | |
8 | * This source code is licensed under the GNU General Public License, | |
9 | * Version 2. See the file COPYING for more details. | |
10 | */ | |
11 | ||
12 | #include <linux/kexec.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/threads.h> | |
d9b2b2a2 | 15 | #include <linux/lmb.h> |
3d1229d6 | 16 | #include <asm/machdep.h> |
d9b2b2a2 | 17 | #include <asm/prom.h> |
3d1229d6 | 18 | |
3d1229d6 ME |
19 | void machine_crash_shutdown(struct pt_regs *regs) |
20 | { | |
21 | if (ppc_md.machine_crash_shutdown) | |
cd0ca2ce | 22 | ppc_md.machine_crash_shutdown(regs); |
3d1229d6 ME |
23 | } |
24 | ||
25 | /* | |
26 | * Do what every setup is needed on image and the | |
27 | * reboot code buffer to allow us to avoid allocations | |
28 | * later. | |
29 | */ | |
30 | int machine_kexec_prepare(struct kimage *image) | |
31 | { | |
32 | if (ppc_md.machine_kexec_prepare) | |
33 | return ppc_md.machine_kexec_prepare(image); | |
34 | /* | |
35 | * Fail if platform doesn't provide its own machine_kexec_prepare | |
36 | * implementation. | |
37 | */ | |
38 | return -ENOSYS; | |
39 | } | |
40 | ||
41 | void machine_kexec_cleanup(struct kimage *image) | |
42 | { | |
43 | if (ppc_md.machine_kexec_cleanup) | |
44 | ppc_md.machine_kexec_cleanup(image); | |
45 | } | |
46 | ||
47 | /* | |
48 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
49 | * We are past the point of no return, committed to rebooting now. | |
50 | */ | |
3ab83521 | 51 | void machine_kexec(struct kimage *image) |
3d1229d6 ME |
52 | { |
53 | if (ppc_md.machine_kexec) | |
54 | ppc_md.machine_kexec(image); | |
55 | else { | |
56 | /* | |
57 | * Fall back to normal restart if platform doesn't provide | |
58 | * its own kexec function, and user insist to kexec... | |
59 | */ | |
60 | machine_restart(NULL); | |
61 | } | |
62 | for(;;); | |
63 | } | |
47585d8f | 64 | |
47585d8f ME |
65 | void __init reserve_crashkernel(void) |
66 | { | |
edd8ce67 BW |
67 | unsigned long long crash_size, crash_base; |
68 | int ret; | |
69 | ||
70 | /* this is necessary because of lmb_phys_mem_size() */ | |
71 | lmb_analyze(); | |
72 | ||
73 | /* use common parsing */ | |
74 | ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(), | |
75 | &crash_size, &crash_base); | |
76 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 77 | crashk_res.start = crash_base; |
eabd9094 | 78 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 79 | } |
47585d8f | 80 | |
eabd9094 ME |
81 | if (crashk_res.end == crashk_res.start) { |
82 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 83 | return; |
eabd9094 | 84 | } |
47585d8f ME |
85 | |
86 | /* We might have got these values via the command line or the | |
87 | * device tree, either way sanitise them now. */ | |
88 | ||
eabd9094 ME |
89 | crash_size = crashk_res.end - crashk_res.start + 1; |
90 | ||
47585d8f ME |
91 | if (crashk_res.start != KDUMP_KERNELBASE) |
92 | printk("Crash kernel location must be 0x%x\n", | |
93 | KDUMP_KERNELBASE); | |
94 | ||
95 | crashk_res.start = KDUMP_KERNELBASE; | |
edd8ce67 BW |
96 | crash_size = PAGE_ALIGN(crash_size); |
97 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f ME |
98 | |
99 | /* Crash kernel trumps memory limit */ | |
100 | if (memory_limit && memory_limit <= crashk_res.end) { | |
101 | memory_limit = crashk_res.end + 1; | |
102 | printk("Adjusted memory limit for crashkernel, now 0x%lx\n", | |
103 | memory_limit); | |
104 | } | |
105 | ||
edd8ce67 BW |
106 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
107 | "for crashkernel (System RAM: %ldMB)\n", | |
108 | (unsigned long)(crash_size >> 20), | |
109 | (unsigned long)(crashk_res.start >> 20), | |
110 | (unsigned long)(lmb_phys_mem_size() >> 20)); | |
111 | ||
112 | lmb_reserve(crashk_res.start, crash_size); | |
47585d8f ME |
113 | } |
114 | ||
115 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
116 | { | |
117 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
118 | } |