1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_KEXEC_H
3#define __ASM_SH_KEXEC_H
4
5#include <asm/ptrace.h>
6#include <asm/string.h>
7#include <linux/kernel.h>
8
9/*
10 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
11 * I.e. Maximum page that is mapped directly into kernel memory,
12 * and kmap is not required.
13 *
14 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
15 * calculation for the amount of memory directly mappable into the
16 * kernel memory space.
17 */
18
19/* Maximum physical address we can use pages from */
20#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
21/* Maximum address we can reach in physical address mode */
22#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
23/* Maximum address we can use for the control code buffer */
24#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
25
26#define KEXEC_CONTROL_PAGE_SIZE	4096
27
28/* The native architecture */
29#define KEXEC_ARCH KEXEC_ARCH_SH
30
31#ifdef CONFIG_KEXEC_CORE
32/* arch/sh/kernel/machine_kexec.c */
33void reserve_crashkernel(void);
34
35static inline void crash_setup_regs(struct pt_regs *newregs,
36				    struct pt_regs *oldregs)
37{
38	if (oldregs)
39		memcpy(newregs, oldregs, sizeof(*newregs));
40	else {
41		__asm__ __volatile__ ("mov r0, %0" : "=r" (newregs->regs[0]));
42		__asm__ __volatile__ ("mov r1, %0" : "=r" (newregs->regs[1]));
43		__asm__ __volatile__ ("mov r2, %0" : "=r" (newregs->regs[2]));
44		__asm__ __volatile__ ("mov r3, %0" : "=r" (newregs->regs[3]));
45		__asm__ __volatile__ ("mov r4, %0" : "=r" (newregs->regs[4]));
46		__asm__ __volatile__ ("mov r5, %0" : "=r" (newregs->regs[5]));
47		__asm__ __volatile__ ("mov r6, %0" : "=r" (newregs->regs[6]));
48		__asm__ __volatile__ ("mov r7, %0" : "=r" (newregs->regs[7]));
49		__asm__ __volatile__ ("mov r8, %0" : "=r" (newregs->regs[8]));
50		__asm__ __volatile__ ("mov r9, %0" : "=r" (newregs->regs[9]));
51		__asm__ __volatile__ ("mov r10, %0" : "=r" (newregs->regs[10]));
52		__asm__ __volatile__ ("mov r11, %0" : "=r" (newregs->regs[11]));
53		__asm__ __volatile__ ("mov r12, %0" : "=r" (newregs->regs[12]));
54		__asm__ __volatile__ ("mov r13, %0" : "=r" (newregs->regs[13]));
55		__asm__ __volatile__ ("mov r14, %0" : "=r" (newregs->regs[14]));
56		__asm__ __volatile__ ("mov r15, %0" : "=r" (newregs->regs[15]));
57
58		__asm__ __volatile__ ("sts pr, %0" : "=r" (newregs->pr));
59		__asm__ __volatile__ ("sts macl, %0" : "=r" (newregs->macl));
60		__asm__ __volatile__ ("sts mach, %0" : "=r" (newregs->mach));
61
62		__asm__ __volatile__ ("stc gbr, %0" : "=r" (newregs->gbr));
63		__asm__ __volatile__ ("stc sr, %0" : "=r" (newregs->sr));
64
65		newregs->pc = _THIS_IP_;
66	}
67}
68#else
69static inline void reserve_crashkernel(void) { }
70#endif /* CONFIG_KEXEC_CORE */
71
72#endif /* __ASM_SH_KEXEC_H */
73