ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / arch / powerpc / kernel / machine_kexec.c
blob29a0e039d436011b61f2f97b96e8b3237e992977
1 /*
2 * Code to handle transition of Linux booting another kernel.
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.
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
12 #include <linux/kexec.h>
13 #include <linux/reboot.h>
14 #include <linux/threads.h>
15 #include <linux/lmb.h>
16 #include <asm/machdep.h>
17 #include <asm/prom.h>
19 void machine_crash_shutdown(struct pt_regs *regs)
21 if (ppc_md.machine_crash_shutdown)
22 ppc_md.machine_crash_shutdown(regs);
26 * Do what every setup is needed on image and the
27 * reboot code buffer to allow us to avoid allocations
28 * later.
30 int machine_kexec_prepare(struct kimage *image)
32 if (ppc_md.machine_kexec_prepare)
33 return ppc_md.machine_kexec_prepare(image);
35 * Fail if platform doesn't provide its own machine_kexec_prepare
36 * implementation.
38 return -ENOSYS;
41 void machine_kexec_cleanup(struct kimage *image)
43 if (ppc_md.machine_kexec_cleanup)
44 ppc_md.machine_kexec_cleanup(image);
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.
51 NORET_TYPE void machine_kexec(struct kimage *image)
53 if (ppc_md.machine_kexec)
54 ppc_md.machine_kexec(image);
55 else {
57 * Fall back to normal restart if platform doesn't provide
58 * its own kexec function, and user insist to kexec...
60 machine_restart(NULL);
62 for(;;);
65 void __init reserve_crashkernel(void)
67 unsigned long long crash_size, crash_base;
68 int ret;
70 /* this is necessary because of lmb_phys_mem_size() */
71 lmb_analyze();
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) {
77 crashk_res.start = crash_base;
78 crashk_res.end = crash_base + crash_size - 1;
81 if (crashk_res.end == crashk_res.start) {
82 crashk_res.start = crashk_res.end = 0;
83 return;
86 /* We might have got these values via the command line or the
87 * device tree, either way sanitise them now. */
89 crash_size = crashk_res.end - crashk_res.start + 1;
91 if (crashk_res.start != KDUMP_KERNELBASE)
92 printk("Crash kernel location must be 0x%x\n",
93 KDUMP_KERNELBASE);
95 crashk_res.start = KDUMP_KERNELBASE;
96 crash_size = PAGE_ALIGN(crash_size);
97 crashk_res.end = crashk_res.start + crash_size - 1;
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);
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));
112 lmb_reserve(crashk_res.start, crash_size);
115 int overlaps_crashkernel(unsigned long start, unsigned long size)
117 return (start + size) > crashk_res.start && start <= crashk_res.end;