xref: /openbmc/linux/arch/arm/include/asm/kexec.h (revision 6aa7de05)
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 */
90