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 
machine_kexec_prepare(struct kimage * kimage)17 int machine_kexec_prepare(struct kimage *kimage)
18 {
19 	return 0;
20 }
21 
machine_kexec_cleanup(struct kimage * kimage)22 void machine_kexec_cleanup(struct kimage *kimage)
23 {
24 }
25 
machine_shutdown(void)26 void machine_shutdown(void)
27 {
28 }
29 
machine_crash_shutdown(struct pt_regs * regs)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 
machine_kexec(struct kimage * image)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