/* * machine_kexec.c - handle transition of Linux booting another kernel */ #include <linux/mm.h> #include <linux/kexec.h> #include <linux/delay.h> #include <linux/reboot.h> #include <linux/io.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/mmu_context.h> #include <asm/cacheflush.h> #include <asm/mach-types.h> extern const unsigned char relocate_new_kernel[]; extern const unsigned int relocate_new_kernel_size; extern void setup_mm_for_reboot(char mode); extern unsigned long kexec_start_address; extern unsigned long kexec_indirection_page; extern unsigned long kexec_mach_type; extern unsigned long kexec_boot_atags; /* * Provide a dummy crash_notes definition while crash dump arrives to arm. * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. */ int machine_kexec_prepare(struct kimage *image) { return 0; } void machine_kexec_cleanup(struct kimage *image) { } void machine_shutdown(void) { } void machine_crash_shutdown(struct pt_regs *regs) { } void machine_kexec(struct kimage *image) { unsigned long page_list; unsigned long reboot_code_buffer_phys; void *reboot_code_buffer; page_list = image->head & PAGE_MASK; /* we need both effective and real address here */ reboot_code_buffer_phys = page_to_pfn(image->control_code_page) << PAGE_SHIFT; reboot_code_buffer = page_address(image->control_code_page); /* Prepare parameters for reboot_code_buffer*/ kexec_start_address = image->start; kexec_indirection_page = page_list; kexec_mach_type = machine_arch_type; kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; /* copy our kernel relocation code to the control code page */ memcpy(reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size); flush_icache_range((unsigned long) reboot_code_buffer, (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); printk(KERN_INFO "Bye!\n"); cpu_proc_fin(); setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/ cpu_reset(reboot_code_buffer_phys); }