1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * machine_kexec.c - handle transition of Linux booting another kernel 4 */ 5 #include <linux/compiler.h> 6 #include <linux/kexec.h> 7 #include <linux/mm.h> 8 #include <linux/delay.h> 9 10 #include <asm/cacheflush.h> 11 #include <asm/page.h> 12 #include <asm/setup.h> 13 14 extern const unsigned char relocate_new_kernel[]; 15 extern const size_t relocate_new_kernel_size; 16 17 int machine_kexec_prepare(struct kimage *kimage) 18 { 19 return 0; 20 } 21 22 void machine_kexec_cleanup(struct kimage *kimage) 23 { 24 } 25 26 void machine_shutdown(void) 27 { 28 } 29 30 void machine_crash_shutdown(struct pt_regs *regs) 31 { 32 } 33 34 typedef void (*relocate_kernel_t)(unsigned long ptr, 35 unsigned long start, 36 unsigned long cpu_mmu_flags) __noreturn; 37 38 void machine_kexec(struct kimage *image) 39 { 40 void *reboot_code_buffer; 41 unsigned long cpu_mmu_flags; 42 43 reboot_code_buffer = page_address(image->control_code_page); 44 45 memcpy(reboot_code_buffer, relocate_new_kernel, 46 relocate_new_kernel_size); 47 48 /* 49 * we do not want to be bothered. 50 */ 51 local_irq_disable(); 52 53 pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start); 54 __flush_cache_all(); 55 cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8; 56 ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK, 57 image->start, 58 cpu_mmu_flags); 59 } 60