1 /* SPDX-License-Identifier: GPL-2.0 */
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 */
12 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
13
14 #define KEXEC_CONTROL_PAGE_SIZE 4096
15
16 #define KEXEC_ARCH KEXEC_ARCH_ARM
17
18 #define KEXEC_ARM_ATAGS_OFFSET 0x1000
19 #define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
20
21 #ifndef __ASSEMBLY__
22
23 #define ARCH_HAS_KIMAGE_ARCH
24 struct kimage_arch {
25 u32 kernel_r2;
26 };
27
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 */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)36 static inline void crash_setup_regs(struct pt_regs *newregs,
37 struct pt_regs *oldregs)
38 {
39 if (oldregs) {
40 memcpy(newregs, oldregs, sizeof(*newregs));
41 } else {
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 );
56 }
57 }
58
59 /* Function pointer to optional machine-specific reinitialization */
60 extern void (*kexec_reinit)(void);
61
phys_to_boot_phys(phys_addr_t phys)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
boot_phys_to_phys(unsigned long entry)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
page_to_boot_pfn(struct page * page)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
boot_pfn_to_page(unsigned long boot_pfn)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
86 #endif /* __ASSEMBLY__ */
87
88 #endif /* CONFIG_KEXEC */
89
90 #endif /* _ARM_KEXEC_H */
91
