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 <asm/pgtable.h> 10 #include <asm/pgalloc.h> 11 #include <asm/mmu_context.h> 12 #include <asm/io.h> 13 #include <asm/cacheflush.h> 14 #include <asm/mach-types.h> 15 16 const extern unsigned char relocate_new_kernel[]; 17 const extern unsigned int relocate_new_kernel_size; 18 19 extern void setup_mm_for_reboot(char mode); 20 21 extern unsigned long kexec_start_address; 22 extern unsigned long kexec_indirection_page; 23 extern unsigned long kexec_mach_type; 24 25 /* 26 * Provide a dummy crash_notes definition while crash dump arrives to arm. 27 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. 28 */ 29 30 int machine_kexec_prepare(struct kimage *image) 31 { 32 return 0; 33 } 34 35 void machine_kexec_cleanup(struct kimage *image) 36 { 37 } 38 39 void machine_shutdown(void) 40 { 41 } 42 43 void machine_crash_shutdown(struct pt_regs *regs) 44 { 45 } 46 47 void machine_kexec(struct kimage *image) 48 { 49 unsigned long page_list; 50 unsigned long reboot_code_buffer_phys; 51 void *reboot_code_buffer; 52 53 54 page_list = image->head & PAGE_MASK; 55 56 /* we need both effective and real address here */ 57 reboot_code_buffer_phys = 58 page_to_pfn(image->control_code_page) << PAGE_SHIFT; 59 reboot_code_buffer = page_address(image->control_code_page); 60 61 /* Prepare parameters for reboot_code_buffer*/ 62 kexec_start_address = image->start; 63 kexec_indirection_page = page_list; 64 kexec_mach_type = machine_arch_type; 65 66 /* copy our kernel relocation code to the control code page */ 67 memcpy(reboot_code_buffer, 68 relocate_new_kernel, relocate_new_kernel_size); 69 70 71 flush_icache_range((unsigned long) reboot_code_buffer, 72 (unsigned long) reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE); 73 printk(KERN_INFO "Bye!\n"); 74 75 cpu_proc_fin(); 76 setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/ 77 cpu_reset(reboot_code_buffer_phys); 78 } 79