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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 | #define ARCH_HAS_KIMAGE_ARCH | |
23 | struct kimage_arch { | |
24 | u32 kernel_r2; | |
25 | }; | |
26 | ||
27 | /** | |
28 | * crash_setup_regs() - save registers for the panic kernel | |
29 | * @newregs: registers are saved here | |
30 | * @oldregs: registers to be saved (may be %NULL) | |
31 | * | |
32 | * Function copies machine registers from @oldregs to @newregs. If @oldregs is | |
33 | * %NULL then current registers are stored there. | |
34 | */ | |
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__ ( | |
42 | "stmia %[regs_base], {r0-r12}\n\t" | |
43 | "mov %[_ARM_sp], sp\n\t" | |
44 | "str lr, %[_ARM_lr]\n\t" | |
45 | "adr %[_ARM_pc], 1f\n\t" | |
46 | "mrs %[_ARM_cpsr], cpsr\n\t" | |
47 | "1:" | |
48 | : [_ARM_pc] "=r" (newregs->ARM_pc), | |
49 | [_ARM_cpsr] "=r" (newregs->ARM_cpsr), | |
50 | [_ARM_sp] "=r" (newregs->ARM_sp), | |
51 | [_ARM_lr] "=o" (newregs->ARM_lr) | |
52 | : [regs_base] "r" (&newregs->ARM_r0) | |
53 | : "memory" | |
54 | ); | |
55 | } | |
56 | } | |
57 | ||
58 | /* Function pointer to optional machine-specific reinitialization */ | |
59 | extern void (*kexec_reinit)(void); | |
60 | ||
61 | static inline unsigned long phys_to_boot_phys(phys_addr_t phys) | |
62 | { | |
63 | return phys_to_idmap(phys); | |
64 | } | |
65 | #define phys_to_boot_phys phys_to_boot_phys | |
66 | ||
67 | static inline phys_addr_t boot_phys_to_phys(unsigned long entry) | |
68 | { | |
69 | return idmap_to_phys(entry); | |
70 | } | |
71 | #define boot_phys_to_phys boot_phys_to_phys | |
72 | ||
73 | static inline unsigned long page_to_boot_pfn(struct page *page) | |
74 | { | |
75 | return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT); | |
76 | } | |
77 | #define page_to_boot_pfn page_to_boot_pfn | |
78 | ||
79 | static inline struct page *boot_pfn_to_page(unsigned long boot_pfn) | |
80 | { | |
81 | return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT)); | |
82 | } | |
83 | #define boot_pfn_to_page boot_pfn_to_page | |
84 | ||
85 | #endif /* __ASSEMBLY__ */ | |
86 | ||
87 | #endif /* CONFIG_KEXEC */ | |
88 | ||
89 | #endif /* _ARM_KEXEC_H */ |