1 /* 2 * machine_kexec.c for kexec 3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006 4 * 5 * This source code is licensed under the GNU General Public License, 6 * Version 2. See the file COPYING for more details. 7 */ 8 9 #include <linux/kexec.h> 10 #include <linux/mm.h> 11 #include <linux/delay.h> 12 13 #include <asm/cacheflush.h> 14 #include <asm/page.h> 15 16 extern const unsigned char relocate_new_kernel[]; 17 extern const unsigned int relocate_new_kernel_size; 18 19 extern unsigned long kexec_start_address; 20 extern unsigned long kexec_indirection_page; 21 22 int 23 machine_kexec_prepare(struct kimage *kimage) 24 { 25 return 0; 26 } 27 28 void 29 machine_kexec_cleanup(struct kimage *kimage) 30 { 31 } 32 33 void 34 machine_shutdown(void) 35 { 36 } 37 38 void 39 machine_crash_shutdown(struct pt_regs *regs) 40 { 41 } 42 43 void 44 machine_kexec(struct kimage *image) 45 { 46 unsigned long reboot_code_buffer; 47 unsigned long entry; 48 unsigned long *ptr; 49 50 reboot_code_buffer = 51 (unsigned long)page_address(image->control_code_page); 52 53 kexec_start_address = image->start; 54 kexec_indirection_page = phys_to_virt(image->head & PAGE_MASK); 55 56 memcpy((void*)reboot_code_buffer, relocate_new_kernel, 57 relocate_new_kernel_size); 58 59 /* 60 * The generic kexec code builds a page list with physical 61 * addresses. they are directly accessible through KSEG0 (or 62 * CKSEG0 or XPHYS if on 64bit system), hence the 63 * pys_to_virt() call. 64 */ 65 for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE); 66 ptr = (entry & IND_INDIRECTION) ? 67 phys_to_virt(entry & PAGE_MASK) : ptr + 1) { 68 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 69 *ptr & IND_DESTINATION) 70 *ptr = phys_to_virt(*ptr); 71 } 72 73 /* 74 * we do not want to be bothered. 75 */ 76 local_irq_disable(); 77 78 flush_icache_range(reboot_code_buffer, 79 reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE); 80 81 printk("Will call new kernel at %08x\n", image->start); 82 printk("Bye ...\n"); 83 flush_cache_all(); 84 ((void (*)(void))reboot_code_buffer)(); 85 } 86