1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ARM_KEXEC_H
3#define _ARM_KEXEC_H
4
5#ifdef CONFIG_KEXEC
6
7/* Maximum physical address we can use pages from */
8#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
9/* Maximum address we can reach in physical address mode */
10#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
11/* Maximum address we can use for the control code buffer */
12#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
13
14#define KEXEC_CONTROL_PAGE_SIZE	4096
15
16#define KEXEC_ARCH KEXEC_ARCH_ARM
17
18#define KEXEC_ARM_ATAGS_OFFSET  0x1000
19#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
20
21#ifndef __ASSEMBLY__
22
23#define ARCH_HAS_KIMAGE_ARCH
24struct kimage_arch {
25	u32 kernel_r2;
26};
27
28/**
29 * crash_setup_regs() - save registers for the panic kernel
30 * @newregs: registers are saved here
31 * @oldregs: registers to be saved (may be %NULL)
32 *
33 * Function copies machine registers from @oldregs to @newregs. If @oldregs is
34 * %NULL then current registers are stored there.
35 */
36static inline void crash_setup_regs(struct pt_regs *newregs,
37				    struct pt_regs *oldregs)
38{
39	if (oldregs) {
40		memcpy(newregs, oldregs, sizeof(*newregs));
41	} else {
42		__asm__ __volatile__ (
43			"stmia	%[regs_base], {r0-r12}\n\t"
44			"mov	%[_ARM_sp], sp\n\t"
45			"str	lr, %[_ARM_lr]\n\t"
46			"adr	%[_ARM_pc], 1f\n\t"
47			"mrs	%[_ARM_cpsr], cpsr\n\t"
48		"1:"
49			: [_ARM_pc] "=r" (newregs->ARM_pc),
50			  [_ARM_cpsr] "=r" (newregs->ARM_cpsr),
51			  [_ARM_sp] "=r" (newregs->ARM_sp),
52			  [_ARM_lr] "=o" (newregs->ARM_lr)
53			: [regs_base] "r" (&newregs->ARM_r0)
54			: "memory"
55		);
56	}
57}
58
59/* Function pointer to optional machine-specific reinitialization */
60extern void (*kexec_reinit)(void);
61
62static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
63{
64	return phys_to_idmap(phys);
65}
66#define phys_to_boot_phys phys_to_boot_phys
67
68static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
69{
70	return idmap_to_phys(entry);
71}
72#define boot_phys_to_phys boot_phys_to_phys
73
74static inline unsigned long page_to_boot_pfn(struct page *page)
75{
76	return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
77}
78#define page_to_boot_pfn page_to_boot_pfn
79
80static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
81{
82	return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
83}
84#define boot_pfn_to_page boot_pfn_to_page
85
86#endif /* __ASSEMBLY__ */
87
88#endif /* CONFIG_KEXEC */
89
90#endif /* _ARM_KEXEC_H */
91