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>
17 #include <asm/machdep.h>
19 #include <asm/sections.h>
21 void machine_crash_shutdown(struct pt_regs *regs)
23 if (ppc_md.machine_crash_shutdown)
24 ppc_md.machine_crash_shutdown(regs);
28 * Do what every setup is needed on image and the
29 * reboot code buffer to allow us to avoid allocations
32 int machine_kexec_prepare(struct kimage *image)
34 if (ppc_md.machine_kexec_prepare)
35 return ppc_md.machine_kexec_prepare(image);
37 * Fail if platform doesn't provide its own machine_kexec_prepare
43 void machine_kexec_cleanup(struct kimage *image)
45 if (ppc_md.machine_kexec_cleanup)
46 ppc_md.machine_kexec_cleanup(image);
50 * Do not allocate memory (or fail in any way) in machine_kexec().
51 * We are past the point of no return, committed to rebooting now.
53 void machine_kexec(struct kimage *image)
55 if (ppc_md.machine_kexec)
56 ppc_md.machine_kexec(image);
59 * Fall back to normal restart if platform doesn't provide
60 * its own kexec function, and user insist to kexec...
62 machine_restart(NULL);
67 void __init reserve_crashkernel(void)
69 unsigned long long crash_size, crash_base;
72 /* this is necessary because of lmb_phys_mem_size() */
75 /* use common parsing */
76 ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
77 &crash_size, &crash_base);
78 if (ret == 0 && crash_size > 0) {
79 crashk_res.start = crash_base;
80 crashk_res.end = crash_base + crash_size - 1;
83 if (crashk_res.end == crashk_res.start) {
84 crashk_res.start = crashk_res.end = 0;
88 /* We might have got these values via the command line or the
89 * device tree, either way sanitise them now. */
91 crash_size = crashk_res.end - crashk_res.start + 1;
93 #ifndef CONFIG_RELOCATABLE
94 if (crashk_res.start != KDUMP_KERNELBASE)
95 printk("Crash kernel location must be 0x%x\n",
98 crashk_res.start = KDUMP_KERNELBASE;
100 crash_size = PAGE_ALIGN(crash_size);
101 crashk_res.end = crashk_res.start + crash_size - 1;
103 /* Crash kernel trumps memory limit */
104 if (memory_limit && memory_limit <= crashk_res.end) {
105 memory_limit = crashk_res.end + 1;
106 printk("Adjusted memory limit for crashkernel, now 0x%lx\n",
110 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
111 "for crashkernel (System RAM: %ldMB)\n",
112 (unsigned long)(crash_size >> 20),
113 (unsigned long)(crashk_res.start >> 20),
114 (unsigned long)(lmb_phys_mem_size() >> 20));
116 lmb_reserve(crashk_res.start, crash_size);
119 int overlaps_crashkernel(unsigned long start, unsigned long size)
121 return (start + size) > crashk_res.start && start <= crashk_res.end;
124 /* Values we need to export to the second kernel via the device tree. */
125 static unsigned long kernel_end;
127 static struct property kernel_end_prop = {
128 .name = "linux,kernel-end",
129 .length = sizeof(unsigned long),
130 .value = &kernel_end,
133 static int __init kexec_setup(void)
135 struct device_node *node;
136 struct property *prop;
138 node = of_find_node_by_path("/chosen");
142 /* remove any stale properties so ours can be found */
143 prop = of_find_property(node, kernel_end_prop.name, NULL);
145 prom_remove_property(node, prop);
147 /* information needed by userspace when using default_machine_kexec */
148 kernel_end = __pa(_end);
149 prom_add_property(node, &kernel_end_prop);
154 late_initcall(kexec_setup);