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> | |
15 | #include <asm/machdep.h> | |
47585d8f | 16 | #include <asm/lmb.h> |
3d1229d6 | 17 | |
3d1229d6 ME |
18 | void machine_crash_shutdown(struct pt_regs *regs) |
19 | { | |
20 | if (ppc_md.machine_crash_shutdown) | |
cd0ca2ce | 21 | ppc_md.machine_crash_shutdown(regs); |
3d1229d6 ME |
22 | } |
23 | ||
24 | /* | |
25 | * Do what every setup is needed on image and the | |
26 | * reboot code buffer to allow us to avoid allocations | |
27 | * later. | |
28 | */ | |
29 | int machine_kexec_prepare(struct kimage *image) | |
30 | { | |
31 | if (ppc_md.machine_kexec_prepare) | |
32 | return ppc_md.machine_kexec_prepare(image); | |
33 | /* | |
34 | * Fail if platform doesn't provide its own machine_kexec_prepare | |
35 | * implementation. | |
36 | */ | |
37 | return -ENOSYS; | |
38 | } | |
39 | ||
40 | void machine_kexec_cleanup(struct kimage *image) | |
41 | { | |
42 | if (ppc_md.machine_kexec_cleanup) | |
43 | ppc_md.machine_kexec_cleanup(image); | |
44 | } | |
45 | ||
46 | /* | |
47 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
48 | * We are past the point of no return, committed to rebooting now. | |
49 | */ | |
50 | NORET_TYPE void machine_kexec(struct kimage *image) | |
51 | { | |
52 | if (ppc_md.machine_kexec) | |
53 | ppc_md.machine_kexec(image); | |
54 | else { | |
55 | /* | |
56 | * Fall back to normal restart if platform doesn't provide | |
57 | * its own kexec function, and user insist to kexec... | |
58 | */ | |
59 | machine_restart(NULL); | |
60 | } | |
61 | for(;;); | |
62 | } | |
47585d8f ME |
63 | |
64 | static int __init early_parse_crashk(char *p) | |
65 | { | |
66 | unsigned long size; | |
67 | ||
68 | if (!p) | |
69 | return 1; | |
70 | ||
71 | size = memparse(p, &p); | |
72 | ||
73 | if (*p == '@') | |
74 | crashk_res.start = memparse(p + 1, &p); | |
75 | else | |
76 | crashk_res.start = KDUMP_KERNELBASE; | |
77 | ||
78 | crashk_res.end = crashk_res.start + size - 1; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | early_param("crashkernel", early_parse_crashk); | |
83 | ||
84 | void __init reserve_crashkernel(void) | |
85 | { | |
86 | unsigned long size; | |
87 | ||
88 | if (crashk_res.start == 0) | |
89 | return; | |
90 | ||
91 | /* We might have got these values via the command line or the | |
92 | * device tree, either way sanitise them now. */ | |
93 | ||
94 | size = crashk_res.end - crashk_res.start + 1; | |
95 | ||
96 | if (crashk_res.start != KDUMP_KERNELBASE) | |
97 | printk("Crash kernel location must be 0x%x\n", | |
98 | KDUMP_KERNELBASE); | |
99 | ||
100 | crashk_res.start = KDUMP_KERNELBASE; | |
101 | size = PAGE_ALIGN(size); | |
102 | crashk_res.end = crashk_res.start + size - 1; | |
103 | ||
104 | /* Crash kernel trumps memory limit */ | |
105 | if (memory_limit && memory_limit <= crashk_res.end) { | |
106 | memory_limit = crashk_res.end + 1; | |
107 | printk("Adjusted memory limit for crashkernel, now 0x%lx\n", | |
108 | memory_limit); | |
109 | } | |
110 | ||
111 | lmb_reserve(crashk_res.start, size); | |
112 | } | |
113 | ||
114 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
115 | { | |
116 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
117 | } |