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 extern unsigned long kexec_boot_atags; 25 26 /* 27 * Provide a dummy crash_notes definition while crash dump arrives to arm. 28 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. 29 */ 30 31 int machine_kexec_prepare(struct kimage *image) 32 { 33 return 0; 34 } 35 36 void machine_kexec_cleanup(struct kimage *image) 37 { 38 } 39 40 void machine_shutdown(void) 41 { 42 } 43 44 void machine_crash_shutdown(struct pt_regs *regs) 45 { 46 } 47 48 void machine_kexec(struct kimage *image) 49 { 50 unsigned long page_list; 51 unsigned long reboot_code_buffer_phys; 52 void *reboot_code_buffer; 53 54 55 page_list = image->head & PAGE_MASK; 56 57 /* we need both effective and real address here */ 58 reboot_code_buffer_phys = 59 page_to_pfn(image->control_code_page) << PAGE_SHIFT; 60 reboot_code_buffer = page_address(image->control_code_page); 61 62 /* Prepare parameters for reboot_code_buffer*/ 63 kexec_start_address = image->start; 64 kexec_indirection_page = page_list; 65 kexec_mach_type = machine_arch_type; 66 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; 67 68 /* copy our kernel relocation code to the control code page */ 69 memcpy(reboot_code_buffer, 70 relocate_new_kernel, relocate_new_kernel_size); 71 72 73 flush_icache_range((unsigned long) reboot_code_buffer, 74 (unsigned long) reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE); 75 printk(KERN_INFO "Bye!\n"); 76 77 cpu_proc_fin(); 78 setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/ 79 cpu_reset(reboot_code_buffer_phys); 80 } 81