machine_kexec.c (1293B)
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 14extern const unsigned char relocate_new_kernel[]; 15extern const size_t relocate_new_kernel_size; 16 17int machine_kexec_prepare(struct kimage *kimage) 18{ 19 return 0; 20} 21 22void machine_kexec_cleanup(struct kimage *kimage) 23{ 24} 25 26void machine_shutdown(void) 27{ 28} 29 30void machine_crash_shutdown(struct pt_regs *regs) 31{ 32} 33 34typedef void (*relocate_kernel_t)(unsigned long ptr, 35 unsigned long start, 36 unsigned long cpu_mmu_flags) __noreturn; 37 38void 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}