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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c587e4a6 RP |
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 */ | |
5ce94e9e | 12 | #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL) |
c587e4a6 | 13 | |
163f6876 | 14 | #define KEXEC_CONTROL_PAGE_SIZE 4096 |
c587e4a6 RP |
15 | |
16 | #define KEXEC_ARCH KEXEC_ARCH_ARM | |
17 | ||
4cd9d6f7 RP |
18 | #define KEXEC_ARM_ATAGS_OFFSET 0x1000 |
19 | #define KEXEC_ARM_ZIMAGE_OFFSET 0x8000 | |
20 | ||
c587e4a6 RP |
21 | #ifndef __ASSEMBLY__ |
22 | ||
0d70262a RK |
23 | #define ARCH_HAS_KIMAGE_ARCH |
24 | struct kimage_arch { | |
25 | u32 kernel_r2; | |
26 | }; | |
27 | ||
24b776bf MW |
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 | */ | |
c587e4a6 | 36 | static inline void crash_setup_regs(struct pt_regs *newregs, |
24b776bf MW |
37 | struct pt_regs *oldregs) |
38 | { | |
39 | if (oldregs) { | |
40 | memcpy(newregs, oldregs, sizeof(*newregs)); | |
41 | } else { | |
cd849ae9 DM |
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 | ); | |
24b776bf MW |
56 | } |
57 | } | |
c587e4a6 | 58 | |
868d172b EC |
59 | /* Function pointer to optional machine-specific reinitialization */ |
60 | extern void (*kexec_reinit)(void); | |
61 | ||
0719392a RK |
62 | static 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 | ||
68 | static 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 | ||
74 | static 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 | ||
80 | static 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 | ||
c587e4a6 RP |
86 | #endif /* __ASSEMBLY__ */ |
87 | ||
88 | #endif /* CONFIG_KEXEC */ | |
89 | ||
90 | #endif /* _ARM_KEXEC_H */ |