Merge tag 'pstore-v4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
[sfrench/cifs-2.6.git] / arch / arm / include / asm / kexec.h
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  */
30 static 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 */
54 extern void (*kexec_reinit)(void);
55
56 static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
57 {
58         return phys_to_idmap(phys);
59 }
60 #define phys_to_boot_phys phys_to_boot_phys
61
62 static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
63 {
64         return idmap_to_phys(entry);
65 }
66 #define boot_phys_to_phys boot_phys_to_phys
67
68 static inline unsigned long page_to_boot_pfn(struct page *page)
69 {
70         return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
71 }
72 #define page_to_boot_pfn page_to_boot_pfn
73
74 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
75 {
76         return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
77 }
78 #define boot_pfn_to_page boot_pfn_to_page
79
80 #endif /* __ASSEMBLY__ */
81
82 #endif /* CONFIG_KEXEC */
83
84 #endif /* _ARM_KEXEC_H */