x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
[linux/fpc-iii.git] / arch / powerpc / kernel / machine_kexec.c
blobe1ec57e87b3b435b88ef55c4598d32c37c8e2e07
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/memblock.h>
16 #include <linux/of.h>
17 #include <linux/irq.h>
18 #include <linux/ftrace.h>
20 #include <asm/machdep.h>
21 #include <asm/prom.h>
22 #include <asm/sections.h>
24 void machine_kexec_mask_interrupts(void) {
25 unsigned int i;
26 struct irq_desc *desc;
28 for_each_irq_desc(i, desc) {
29 struct irq_chip *chip;
31 chip = irq_desc_get_chip(desc);
32 if (!chip)
33 continue;
35 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
36 chip->irq_eoi(&desc->irq_data);
38 if (chip->irq_mask)
39 chip->irq_mask(&desc->irq_data);
41 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
42 chip->irq_disable(&desc->irq_data);
46 void machine_crash_shutdown(struct pt_regs *regs)
48 default_machine_crash_shutdown(regs);
52 * Do what every setup is needed on image and the
53 * reboot code buffer to allow us to avoid allocations
54 * later.
56 int machine_kexec_prepare(struct kimage *image)
58 if (ppc_md.machine_kexec_prepare)
59 return ppc_md.machine_kexec_prepare(image);
60 else
61 return default_machine_kexec_prepare(image);
64 void machine_kexec_cleanup(struct kimage *image)
68 void arch_crash_save_vmcoreinfo(void)
71 #ifdef CONFIG_NEED_MULTIPLE_NODES
72 VMCOREINFO_SYMBOL(node_data);
73 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
74 #endif
75 #ifndef CONFIG_NEED_MULTIPLE_NODES
76 VMCOREINFO_SYMBOL(contig_page_data);
77 #endif
81 * Do not allocate memory (or fail in any way) in machine_kexec().
82 * We are past the point of no return, committed to rebooting now.
84 void machine_kexec(struct kimage *image)
86 int save_ftrace_enabled;
88 save_ftrace_enabled = __ftrace_enabled_save();
90 if (ppc_md.machine_kexec)
91 ppc_md.machine_kexec(image);
92 else
93 default_machine_kexec(image);
95 __ftrace_enabled_restore(save_ftrace_enabled);
97 /* Fall back to normal restart if we're still alive. */
98 machine_restart(NULL);
99 for(;;);
102 void __init reserve_crashkernel(void)
104 unsigned long long crash_size, crash_base;
105 int ret;
107 /* use common parsing */
108 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
109 &crash_size, &crash_base);
110 if (ret == 0 && crash_size > 0) {
111 crashk_res.start = crash_base;
112 crashk_res.end = crash_base + crash_size - 1;
115 if (crashk_res.end == crashk_res.start) {
116 crashk_res.start = crashk_res.end = 0;
117 return;
120 /* We might have got these values via the command line or the
121 * device tree, either way sanitise them now. */
123 crash_size = resource_size(&crashk_res);
125 #ifndef CONFIG_NONSTATIC_KERNEL
126 if (crashk_res.start != KDUMP_KERNELBASE)
127 printk("Crash kernel location must be 0x%x\n",
128 KDUMP_KERNELBASE);
130 crashk_res.start = KDUMP_KERNELBASE;
131 #else
132 if (!crashk_res.start) {
133 #ifdef CONFIG_PPC64
135 * On 64bit we split the RMO in half but cap it at half of
136 * a small SLB (128MB) since the crash kernel needs to place
137 * itself and some stacks to be in the first segment.
139 crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2));
140 #else
141 crashk_res.start = KDUMP_KERNELBASE;
142 #endif
145 crash_base = PAGE_ALIGN(crashk_res.start);
146 if (crash_base != crashk_res.start) {
147 printk("Crash kernel base must be aligned to 0x%lx\n",
148 PAGE_SIZE);
149 crashk_res.start = crash_base;
152 #endif
153 crash_size = PAGE_ALIGN(crash_size);
154 crashk_res.end = crashk_res.start + crash_size - 1;
156 /* The crash region must not overlap the current kernel */
157 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
158 printk(KERN_WARNING
159 "Crash kernel can not overlap current kernel\n");
160 crashk_res.start = crashk_res.end = 0;
161 return;
164 /* Crash kernel trumps memory limit */
165 if (memory_limit && memory_limit <= crashk_res.end) {
166 memory_limit = crashk_res.end + 1;
167 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
168 memory_limit);
171 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
172 "for crashkernel (System RAM: %ldMB)\n",
173 (unsigned long)(crash_size >> 20),
174 (unsigned long)(crashk_res.start >> 20),
175 (unsigned long)(memblock_phys_mem_size() >> 20));
177 memblock_reserve(crashk_res.start, crash_size);
180 int overlaps_crashkernel(unsigned long start, unsigned long size)
182 return (start + size) > crashk_res.start && start <= crashk_res.end;
185 /* Values we need to export to the second kernel via the device tree. */
186 static phys_addr_t kernel_end;
187 static phys_addr_t crashk_size;
189 static struct property kernel_end_prop = {
190 .name = "linux,kernel-end",
191 .length = sizeof(phys_addr_t),
192 .value = &kernel_end,
195 static struct property crashk_base_prop = {
196 .name = "linux,crashkernel-base",
197 .length = sizeof(phys_addr_t),
198 .value = &crashk_res.start,
201 static struct property crashk_size_prop = {
202 .name = "linux,crashkernel-size",
203 .length = sizeof(phys_addr_t),
204 .value = &crashk_size,
207 static struct property memory_limit_prop = {
208 .name = "linux,memory-limit",
209 .length = sizeof(unsigned long long),
210 .value = &memory_limit,
213 static void __init export_crashk_values(struct device_node *node)
215 struct property *prop;
217 /* There might be existing crash kernel properties, but we can't
218 * be sure what's in them, so remove them. */
219 prop = of_find_property(node, "linux,crashkernel-base", NULL);
220 if (prop)
221 of_remove_property(node, prop);
223 prop = of_find_property(node, "linux,crashkernel-size", NULL);
224 if (prop)
225 of_remove_property(node, prop);
227 if (crashk_res.start != 0) {
228 of_add_property(node, &crashk_base_prop);
229 crashk_size = resource_size(&crashk_res);
230 of_add_property(node, &crashk_size_prop);
234 * memory_limit is required by the kexec-tools to limit the
235 * crash regions to the actual memory used.
237 of_update_property(node, &memory_limit_prop);
240 static int __init kexec_setup(void)
242 struct device_node *node;
243 struct property *prop;
245 node = of_find_node_by_path("/chosen");
246 if (!node)
247 return -ENOENT;
249 /* remove any stale properties so ours can be found */
250 prop = of_find_property(node, kernel_end_prop.name, NULL);
251 if (prop)
252 of_remove_property(node, prop);
254 /* information needed by userspace when using default_machine_kexec */
255 kernel_end = __pa(_end);
256 of_add_property(node, &kernel_end_prop);
258 export_crashk_values(node);
260 of_node_put(node);
261 return 0;
263 late_initcall(kexec_setup);