xref: /openbmc/linux/arch/sh/include/asm/kexec.h (revision 8d00d0c0)
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
32 /* arch/sh/kernel/machine_kexec.c */
33 void reserve_crashkernel(void);
34 
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)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
reserve_crashkernel(void)69 static inline void reserve_crashkernel(void) { }
70 #endif /* CONFIG_KEXEC */
71 
72 #endif /* __ASM_SH_KEXEC_H */
73