1 /* 2 * machine_kexec.c - handle transition of Linux booting another kernel 3 */ 4 #include <linux/compiler.h> 5 #include <linux/kexec.h> 6 #include <linux/mm.h> 7 #include <linux/delay.h> 8 9 #include <asm/cacheflush.h> 10 #include <asm/page.h> 11 #include <asm/setup.h> 12 13 extern const unsigned char relocate_new_kernel[]; 14 extern const size_t relocate_new_kernel_size; 15 machine_kexec_prepare(struct kimage * kimage)16 int machine_kexec_prepare(struct kimage *kimage) 17 { 18 return 0; 19 } 20 machine_kexec_cleanup(struct kimage * kimage)21 void machine_kexec_cleanup(struct kimage *kimage) 22 { 23 } 24 machine_shutdown(void)25 void machine_shutdown(void) 26 { 27 } 28 machine_crash_shutdown(struct pt_regs * regs)29 void machine_crash_shutdown(struct pt_regs *regs) 30 { 31 } 32 33 typedef void (*relocate_kernel_t)(unsigned long ptr, 34 unsigned long start, 35 unsigned long cpu_mmu_flags) __noreturn; 36 machine_kexec(struct kimage * image)37 void machine_kexec(struct kimage *image) 38 { 39 void *reboot_code_buffer; 40 unsigned long cpu_mmu_flags; 41 42 reboot_code_buffer = page_address(image->control_code_page); 43 44 memcpy(reboot_code_buffer, relocate_new_kernel, 45 relocate_new_kernel_size); 46 47 /* 48 * we do not want to be bothered. 49 */ 50 local_irq_disable(); 51 52 pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start); 53 __flush_cache_all(); 54 cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8; 55 ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK, 56 image->start, 57 cpu_mmu_flags); 58 } 59