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 */

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