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 #include <linux/reboot.h> 10 11 #include <asm/cacheflush.h> 12 #include <asm/page.h> 13 #include <asm/setup.h> 14 15 extern const unsigned char relocate_new_kernel[]; 16 extern const size_t relocate_new_kernel_size; 17 18 int machine_kexec_prepare(struct kimage *kimage) 19 { 20 return 0; 21 } 22 23 void machine_kexec_cleanup(struct kimage *kimage) 24 { 25 } 26 27 void machine_shutdown(void) 28 { 29 } 30 31 void machine_crash_shutdown(struct pt_regs *regs) 32 { 33 } 34 35 typedef void (*relocate_kernel_t)(unsigned long ptr, 36 unsigned long start, 37 unsigned long cpu_mmu_flags) __noreturn; 38 39 void machine_kexec(struct kimage *image) 40 { 41 void *reboot_code_buffer; 42 unsigned long cpu_mmu_flags; 43 44 reboot_code_buffer = page_address(image->control_code_page); 45 46 memcpy(reboot_code_buffer, relocate_new_kernel, 47 relocate_new_kernel_size); 48 49 /* 50 * we do not want to be bothered. 51 */ 52 local_irq_disable(); 53 54 pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start); 55 __flush_cache_all(); 56 cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8; 57 ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK, 58 image->start, 59 cpu_mmu_flags); 60 } 61