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Linux/arch/sh/kernel/machine_kexec.c

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  1 /*
  2  * machine_kexec.c - handle transition of Linux booting another kernel
  3  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
  4  *
  5  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
  6  * LANDISK/sh4 supported by kogiidena
  7  *
  8  * This source code is licensed under the GNU General Public License,
  9  * Version 2.  See the file COPYING for more details.
 10  */
 11 #include <linux/mm.h>
 12 #include <linux/kexec.h>
 13 #include <linux/delay.h>
 14 #include <linux/reboot.h>
 15 #include <linux/numa.h>
 16 #include <linux/ftrace.h>
 17 #include <linux/suspend.h>
 18 #include <linux/memblock.h>
 19 #include <asm/pgtable.h>
 20 #include <asm/pgalloc.h>
 21 #include <asm/mmu_context.h>
 22 #include <asm/io.h>
 23 #include <asm/cacheflush.h>
 24 #include <asm/sh_bios.h>
 25 #include <asm/reboot.h>
 26 
 27 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
 28                                       unsigned long reboot_code_buffer,
 29                                       unsigned long start_address);
 30 
 31 extern const unsigned char relocate_new_kernel[];
 32 extern const unsigned int relocate_new_kernel_size;
 33 extern void *vbr_base;
 34 
 35 void native_machine_crash_shutdown(struct pt_regs *regs)
 36 {
 37         /* Nothing to do for UP, but definitely broken for SMP.. */
 38 }
 39 
 40 /*
 41  * Do what every setup is needed on image and the
 42  * reboot code buffer to allow us to avoid allocations
 43  * later.
 44  */
 45 int machine_kexec_prepare(struct kimage *image)
 46 {
 47         return 0;
 48 }
 49 
 50 void machine_kexec_cleanup(struct kimage *image)
 51 {
 52 }
 53 
 54 static void kexec_info(struct kimage *image)
 55 {
 56         int i;
 57         printk("kexec information\n");
 58         for (i = 0; i < image->nr_segments; i++) {
 59                 printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
 60                        i,
 61                        (unsigned int)image->segment[i].mem,
 62                        (unsigned int)image->segment[i].mem +
 63                                      image->segment[i].memsz,
 64                        (unsigned int)image->segment[i].memsz);
 65         }
 66         printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
 67 }
 68 
 69 /*
 70  * Do not allocate memory (or fail in any way) in machine_kexec().
 71  * We are past the point of no return, committed to rebooting now.
 72  */
 73 void machine_kexec(struct kimage *image)
 74 {
 75         unsigned long page_list;
 76         unsigned long reboot_code_buffer;
 77         relocate_new_kernel_t rnk;
 78         unsigned long entry;
 79         unsigned long *ptr;
 80         int save_ftrace_enabled;
 81 
 82         /*
 83          * Nicked from the mips version of machine_kexec():
 84          * The generic kexec code builds a page list with physical
 85          * addresses. Use phys_to_virt() to convert them to virtual.
 86          */
 87         for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
 88              ptr = (entry & IND_INDIRECTION) ?
 89                phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
 90                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
 91                     *ptr & IND_DESTINATION)
 92                         *ptr = (unsigned long) phys_to_virt(*ptr);
 93         }
 94 
 95 #ifdef CONFIG_KEXEC_JUMP
 96         if (image->preserve_context)
 97                 save_processor_state();
 98 #endif
 99 
100         save_ftrace_enabled = __ftrace_enabled_save();
101 
102         /* Interrupts aren't acceptable while we reboot */
103         local_irq_disable();
104 
105         page_list = image->head;
106 
107         /* we need both effective and real address here */
108         reboot_code_buffer =
109                         (unsigned long)page_address(image->control_code_page);
110 
111         /* copy our kernel relocation code to the control code page */
112         memcpy((void *)reboot_code_buffer, relocate_new_kernel,
113                                                 relocate_new_kernel_size);
114 
115         kexec_info(image);
116         flush_cache_all();
117 
118         sh_bios_vbr_reload();
119 
120         /* now call it */
121         rnk = (relocate_new_kernel_t) reboot_code_buffer;
122         (*rnk)(page_list, reboot_code_buffer,
123                (unsigned long)phys_to_virt(image->start));
124 
125 #ifdef CONFIG_KEXEC_JUMP
126         asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
127 
128         if (image->preserve_context)
129                 restore_processor_state();
130 
131         /* Convert page list back to physical addresses, what a mess. */
132         for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
133              ptr = (*ptr & IND_INDIRECTION) ?
134                phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
135                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
136                     *ptr & IND_DESTINATION)
137                         *ptr = virt_to_phys(*ptr);
138         }
139 #endif
140 
141         __ftrace_enabled_restore(save_ftrace_enabled);
142 }
143 
144 void arch_crash_save_vmcoreinfo(void)
145 {
146 #ifdef CONFIG_NUMA
147         VMCOREINFO_SYMBOL(node_data);
148         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
149 #endif
150 #ifdef CONFIG_X2TLB
151         VMCOREINFO_CONFIG(X2TLB);
152 #endif
153 }
154 
155 void __init reserve_crashkernel(void)
156 {
157         unsigned long long crash_size, crash_base;
158         int ret;
159 
160         ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
161                         &crash_size, &crash_base);
162         if (ret == 0 && crash_size > 0) {
163                 crashk_res.start = crash_base;
164                 crashk_res.end = crash_base + crash_size - 1;
165         }
166 
167         if (crashk_res.end == crashk_res.start)
168                 goto disable;
169 
170         crash_size = PAGE_ALIGN(resource_size(&crashk_res));
171         if (!crashk_res.start) {
172                 unsigned long max = memblock_end_of_DRAM() - memory_limit;
173                 crashk_res.start = __memblock_alloc_base(crash_size, PAGE_SIZE, max);
174                 if (!crashk_res.start) {
175                         pr_err("crashkernel allocation failed\n");
176                         goto disable;
177                 }
178         } else {
179                 ret = memblock_reserve(crashk_res.start, crash_size);
180                 if (unlikely(ret < 0)) {
181                         pr_err("crashkernel reservation failed - "
182                                "memory is in use\n");
183                         goto disable;
184                 }
185         }
186 
187         crashk_res.end = crashk_res.start + crash_size - 1;
188 
189         /*
190          * Crash kernel trumps memory limit
191          */
192         if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
193                 memory_limit = 0;
194                 pr_info("Disabled memory limit for crashkernel\n");
195         }
196 
197         pr_info("Reserving %ldMB of memory at 0x%08lx "
198                 "for crashkernel (System RAM: %ldMB)\n",
199                 (unsigned long)(crash_size >> 20),
200                 (unsigned long)(crashk_res.start),
201                 (unsigned long)(memblock_phys_mem_size() >> 20));
202 
203         return;
204 
205 disable:
206         crashk_res.start = crashk_res.end = 0;
207 }
208 

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