machine_kexec.c

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    1 /*
    2  * machine_kexec.c - handle transition of Linux booting another kernel
    3  */
    4 
    5 #include <linux/mm.h>
    6 #include <linux/kexec.h>
    7 #include <linux/delay.h>
    8 #include <linux/reboot.h>
    9 #include <linux/io.h>
   10 #include <linux/irq.h>
   11 #include <linux/memblock.h>
   12 #include <asm/pgtable.h>
   13 #include <linux/of_fdt.h>
   14 #include <asm/pgalloc.h>
   15 #include <asm/mmu_context.h>
   16 #include <asm/cacheflush.h>
   17 #include <asm/mach-types.h>
   18 #include <asm/system_misc.h>
   19 
   20 extern const unsigned char relocate_new_kernel[];
   21 extern const unsigned int relocate_new_kernel_size;
   22 
   23 extern unsigned long kexec_start_address;
   24 extern unsigned long kexec_indirection_page;
   25 extern unsigned long kexec_mach_type;
   26 extern unsigned long kexec_boot_atags;
   27 
   28 static atomic_t waiting_for_crash_ipi;
   29 
   30 /*
   31  * Provide a dummy crash_notes definition while crash dump arrives to arm.
   32  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
   33  */
   34 
   35 int machine_kexec_prepare(struct kimage *image)
   36 {
   37         struct kexec_segment *current_segment;
   38         __be32 header;
   39         int i, err;
   40 
   41         /*
   42          * No segment at default ATAGs address. try to locate
   43          * a dtb using magic.
   44          */
   45         for (i = 0; i < image->nr_segments; i++) {
   46                 current_segment = &image->segment[i];
   47 
   48                 if (!memblock_is_region_memory(current_segment->mem,
   49                                                current_segment->memsz))
   50                         return -EINVAL;
   51 
   52                 err = get_user(header, (__be32*)current_segment->buf);
   53                 if (err)
   54                         return err;
   55 
   56                 if (be32_to_cpu(header) == OF_DT_HEADER)
   57                         kexec_boot_atags = current_segment->mem;
   58         }
   59         return 0;
   60 }
   61 
   62 void machine_kexec_cleanup(struct kimage *image)
   63 {
   64 }
   65 
   66 void machine_crash_nonpanic_core(void *unused)
   67 {
   68         struct pt_regs regs;
   69 
   70         crash_setup_regs(&regs, NULL);
   71         printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
   72                smp_processor_id());
   73         crash_save_cpu(&regs, smp_processor_id());
   74         flush_cache_all();
   75 
   76         atomic_dec(&waiting_for_crash_ipi);
   77         while (1)
   78                 cpu_relax();
   79 }
   80 
   81 static void machine_kexec_mask_interrupts(void)
   82 {
   83         unsigned int i;
   84         struct irq_desc *desc;
   85 
   86         for_each_irq_desc(i, desc) {
   87                 struct irq_chip *chip;
   88 
   89                 chip = irq_desc_get_chip(desc);
   90                 if (!chip)
   91                         continue;
   92 
   93                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
   94                         chip->irq_eoi(&desc->irq_data);
   95 
   96                 if (chip->irq_mask)
   97                         chip->irq_mask(&desc->irq_data);
   98 
   99                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
  100                         chip->irq_disable(&desc->irq_data);
  101         }
  102 }
  103 
  104 void machine_crash_shutdown(struct pt_regs *regs)
  105 {
  106         unsigned long msecs;
  107 
  108         local_irq_disable();
  109 
  110         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
  111         smp_call_function(machine_crash_nonpanic_core, NULL, false);
  112         msecs = 1000; /* Wait at most a second for the other cpus to stop */
  113         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
  114                 mdelay(1);
  115                 msecs--;
  116         }
  117         if (atomic_read(&waiting_for_crash_ipi) > 0)
  118                 printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
  119 
  120         crash_save_cpu(regs, smp_processor_id());
  121         machine_kexec_mask_interrupts();
  122 
  123         printk(KERN_INFO "Loading crashdump kernel...\n");
  124 }
  125 
  126 /*
  127  * Function pointer to optional machine-specific reinitialization
  128  */
  129 void (*kexec_reinit)(void);
  130 
  131 void machine_kexec(struct kimage *image)
  132 {
  133         unsigned long page_list;
  134         unsigned long reboot_code_buffer_phys;
  135         void *reboot_code_buffer;
  136 
  137 
  138         page_list = image->head & PAGE_MASK;
  139 
  140         /* we need both effective and real address here */
  141         reboot_code_buffer_phys =
  142             page_to_pfn(image->control_code_page) << PAGE_SHIFT;
  143         reboot_code_buffer = page_address(image->control_code_page);
  144 
  145         /* Prepare parameters for reboot_code_buffer*/
  146         kexec_start_address = image->start;
  147         kexec_indirection_page = page_list;
  148         kexec_mach_type = machine_arch_type;
  149         if (!kexec_boot_atags)
  150                 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
  151 
  152 
  153         /* copy our kernel relocation code to the control code page */
  154         memcpy(reboot_code_buffer,
  155                relocate_new_kernel, relocate_new_kernel_size);
  156 
  157 
  158         flush_icache_range((unsigned long) reboot_code_buffer,
  159                            (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
  160         printk(KERN_INFO "Bye!\n");
  161 
  162         if (kexec_reinit)
  163                 kexec_reinit();
  164 
  165         soft_restart(reboot_code_buffer_phys);
  166 }

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FreeBSD/Linux Kernel Cross Reference sys/arch/arm/kernel/machine_kexec.c

FreeBSD/Linux Kernel Cross Reference
sys/arch/arm/kernel/machine_kexec.c