Merge remote-tracking branches 'spi/topic/sh-msiof', 'spi/topic/stm32', 'spi/topic...
[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 #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 */