1#ifndef _ARM_KEXEC_H
2#define _ARM_KEXEC_H
3
4#ifdef CONFIG_KEXEC
5
6/* Maximum physical address we can use pages from */
7#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
8/* Maximum address we can reach in physical address mode */
9#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
10/* Maximum address we can use for the control code buffer */
11#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
12
13#define KEXEC_CONTROL_PAGE_SIZE	4096
14
15#define KEXEC_ARCH KEXEC_ARCH_ARM
16
17#define KEXEC_ARM_ATAGS_OFFSET  0x1000
18#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
19
20#ifndef __ASSEMBLY__
21
22/**
23 * crash_setup_regs() - save registers for the panic kernel
24 * @newregs: registers are saved here
25 * @oldregs: registers to be saved (may be %NULL)
26 *
27 * Function copies machine registers from @oldregs to @newregs. If @oldregs is
28 * %NULL then current registers are stored there.
29 */
30static inline void crash_setup_regs(struct pt_regs *newregs,
31				    struct pt_regs *oldregs)
32{
33	if (oldregs) {
34		memcpy(newregs, oldregs, sizeof(*newregs));
35	} else {
36		__asm__ __volatile__ (
37			"stmia	%[regs_base], {r0-r12}\n\t"
38			"mov	%[_ARM_sp], sp\n\t"
39			"str	lr, %[_ARM_lr]\n\t"
40			"adr	%[_ARM_pc], 1f\n\t"
41			"mrs	%[_ARM_cpsr], cpsr\n\t"
42		"1:"
43			: [_ARM_pc] "=r" (newregs->ARM_pc),
44			  [_ARM_cpsr] "=r" (newregs->ARM_cpsr),
45			  [_ARM_sp] "=r" (newregs->ARM_sp),
46			  [_ARM_lr] "=o" (newregs->ARM_lr)
47			: [regs_base] "r" (&newregs->ARM_r0)
48			: "memory"
49		);
50	}
51}
52
53/* Function pointer to optional machine-specific reinitialization */
54extern void (*kexec_reinit)(void);
55
56#endif /* __ASSEMBLY__ */
57
58#endif /* CONFIG_KEXEC */
59
60#endif /* _ARM_KEXEC_H */
61