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/memblock.h>
17 #include <linux/irq.h>
18 #include <linux/ftrace.h>
20 #include <asm/machdep.h>
22 #include <asm/sections.h>
24 void machine_kexec_mask_interrupts(void) {
28 struct irq_desc *desc = irq_to_desc(i);
29 struct irq_chip *chip;
34 chip = irq_desc_get_chip(desc);
38 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
39 chip->irq_eoi(&desc->irq_data);
42 chip->irq_mask(&desc->irq_data);
44 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
45 chip->irq_disable(&desc->irq_data);
49 void machine_crash_shutdown(struct pt_regs *regs)
51 default_machine_crash_shutdown(regs);
55 * Do what every setup is needed on image and the
56 * reboot code buffer to allow us to avoid allocations
59 int machine_kexec_prepare(struct kimage *image)
61 if (ppc_md.machine_kexec_prepare)
62 return ppc_md.machine_kexec_prepare(image);
64 return default_machine_kexec_prepare(image);
67 void machine_kexec_cleanup(struct kimage *image)
71 void arch_crash_save_vmcoreinfo(void)
74 #ifdef CONFIG_NEED_MULTIPLE_NODES
75 VMCOREINFO_SYMBOL(node_data);
76 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
78 #ifndef CONFIG_NEED_MULTIPLE_NODES
79 VMCOREINFO_SYMBOL(contig_page_data);
84 * Do not allocate memory (or fail in any way) in machine_kexec().
85 * We are past the point of no return, committed to rebooting now.
87 void machine_kexec(struct kimage *image)
89 int save_ftrace_enabled;
91 save_ftrace_enabled = __ftrace_enabled_save();
93 if (ppc_md.machine_kexec)
94 ppc_md.machine_kexec(image);
96 default_machine_kexec(image);
98 __ftrace_enabled_restore(save_ftrace_enabled);
100 /* Fall back to normal restart if we're still alive. */
101 machine_restart(NULL);
105 void __init reserve_crashkernel(void)
107 unsigned long long crash_size, crash_base;
110 /* use common parsing */
111 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
112 &crash_size, &crash_base);
113 if (ret == 0 && crash_size > 0) {
114 crashk_res.start = crash_base;
115 crashk_res.end = crash_base + crash_size - 1;
118 if (crashk_res.end == crashk_res.start) {
119 crashk_res.start = crashk_res.end = 0;
123 /* We might have got these values via the command line or the
124 * device tree, either way sanitise them now. */
126 crash_size = resource_size(&crashk_res);
128 #ifndef CONFIG_NONSTATIC_KERNEL
129 if (crashk_res.start != KDUMP_KERNELBASE)
130 printk("Crash kernel location must be 0x%x\n",
133 crashk_res.start = KDUMP_KERNELBASE;
135 if (!crashk_res.start) {
138 * On 64bit we split the RMO in half but cap it at half of
139 * a small SLB (128MB) since the crash kernel needs to place
140 * itself and some stacks to be in the first segment.
142 crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2));
144 crashk_res.start = KDUMP_KERNELBASE;
148 crash_base = PAGE_ALIGN(crashk_res.start);
149 if (crash_base != crashk_res.start) {
150 printk("Crash kernel base must be aligned to 0x%lx\n",
152 crashk_res.start = crash_base;
156 crash_size = PAGE_ALIGN(crash_size);
157 crashk_res.end = crashk_res.start + crash_size - 1;
159 /* The crash region must not overlap the current kernel */
160 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
162 "Crash kernel can not overlap current kernel\n");
163 crashk_res.start = crashk_res.end = 0;
167 /* Crash kernel trumps memory limit */
168 if (memory_limit && memory_limit <= crashk_res.end) {
169 memory_limit = crashk_res.end + 1;
170 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
171 (unsigned long long)memory_limit);
174 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
175 "for crashkernel (System RAM: %ldMB)\n",
176 (unsigned long)(crash_size >> 20),
177 (unsigned long)(crashk_res.start >> 20),
178 (unsigned long)(memblock_phys_mem_size() >> 20));
180 memblock_reserve(crashk_res.start, crash_size);
183 int overlaps_crashkernel(unsigned long start, unsigned long size)
185 return (start + size) > crashk_res.start && start <= crashk_res.end;
188 /* Values we need to export to the second kernel via the device tree. */
189 static phys_addr_t kernel_end;
190 static phys_addr_t crashk_size;
192 static struct property kernel_end_prop = {
193 .name = "linux,kernel-end",
194 .length = sizeof(phys_addr_t),
195 .value = &kernel_end,
198 static struct property crashk_base_prop = {
199 .name = "linux,crashkernel-base",
200 .length = sizeof(phys_addr_t),
201 .value = &crashk_res.start,
204 static struct property crashk_size_prop = {
205 .name = "linux,crashkernel-size",
206 .length = sizeof(phys_addr_t),
207 .value = &crashk_size,
210 static void __init export_crashk_values(struct device_node *node)
212 struct property *prop;
214 /* There might be existing crash kernel properties, but we can't
215 * be sure what's in them, so remove them. */
216 prop = of_find_property(node, "linux,crashkernel-base", NULL);
218 prom_remove_property(node, prop);
220 prop = of_find_property(node, "linux,crashkernel-size", NULL);
222 prom_remove_property(node, prop);
224 if (crashk_res.start != 0) {
225 prom_add_property(node, &crashk_base_prop);
226 crashk_size = resource_size(&crashk_res);
227 prom_add_property(node, &crashk_size_prop);
231 static int __init kexec_setup(void)
233 struct device_node *node;
234 struct property *prop;
236 node = of_find_node_by_path("/chosen");
240 /* remove any stale properties so ours can be found */
241 prop = of_find_property(node, kernel_end_prop.name, NULL);
243 prom_remove_property(node, prop);
245 /* information needed by userspace when using default_machine_kexec */
246 kernel_end = __pa(_end);
247 prom_add_property(node, &kernel_end_prop);
249 export_crashk_values(node);
254 late_initcall(kexec_setup);