tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
30static 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 */
54extern void (*kexec_reinit)(void);
55
56static 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
62static 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
68static 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
74static 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 */