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 */
33 void reserve_crashkernel(void);
34
35 static 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
69 static inline void reserve_crashkernel(void) { }
70 #endif /* CONFIG_KEXEC_CORE */
71
72 #endif /* __ASM_SH_KEXEC_H */
73
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