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 size_t relocate_new_kernel_size; 18 19 extern unsigned long kexec_start_address; 20 extern unsigned long kexec_indirection_page; 21 22 int machine_kexec_prepare(struct kimage * kimage)23machine_kexec_prepare(struct kimage *kimage) 24 { 25 return 0; 26 } 27 28 void machine_kexec_cleanup(struct kimage * kimage)29machine_kexec_cleanup(struct kimage *kimage) 30 { 31 } 32 33 void machine_shutdown(void)34machine_shutdown(void) 35 { 36 } 37 38 void machine_crash_shutdown(struct pt_regs * regs)39machine_crash_shutdown(struct pt_regs *regs) 40 { 41 } 42 43 typedef void (*noretfun_t)(void) __attribute__((noreturn)); 44 45 void machine_kexec(struct kimage * image)46machine_kexec(struct kimage *image) 47 { 48 unsigned long reboot_code_buffer; 49 unsigned long entry; 50 unsigned long *ptr; 51 52 reboot_code_buffer = 53 (unsigned long)page_address(image->control_code_page); 54 55 kexec_start_address = image->start; 56 kexec_indirection_page = 57 (unsigned long) phys_to_virt(image->head & PAGE_MASK); 58 59 memcpy((void*)reboot_code_buffer, relocate_new_kernel, 60 relocate_new_kernel_size); 61 62 /* 63 * The generic kexec code builds a page list with physical 64 * addresses. they are directly accessible through KSEG0 (or 65 * CKSEG0 or XPHYS if on 64bit system), hence the 66 * pys_to_virt() call. 67 */ 68 for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE); 69 ptr = (entry & IND_INDIRECTION) ? 70 phys_to_virt(entry & PAGE_MASK) : ptr + 1) { 71 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 72 *ptr & IND_DESTINATION) 73 *ptr = (unsigned long) phys_to_virt(*ptr); 74 } 75 76 /* 77 * we do not want to be bothered. 78 */ 79 local_irq_disable(); 80 81 printk("Will call new kernel at %08lx\n", image->start); 82 printk("Bye ...\n"); 83 __flush_cache_all(); 84 ((noretfun_t) reboot_code_buffer)(); 85 } 86