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 */ 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 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 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 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 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