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>
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
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
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
);
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
);
65 void __init
reserve_crashkernel(void)
67 unsigned long long crash_size
, crash_base
;
70 /* this is necessary because of lmb_phys_mem_size() */
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;
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",
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",
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
;