1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ARM_KEXEC_H 3 #define _ARM_KEXEC_H 4 5 /* Maximum physical address we can use pages from */ 6 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) 7 /* Maximum address we can reach in physical address mode */ 8 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) 9 /* Maximum address we can use for the control code buffer */ 10 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL) 11 12 #define KEXEC_CONTROL_PAGE_SIZE 4096 13 14 #define KEXEC_ARCH KEXEC_ARCH_ARM 15 16 #define KEXEC_ARM_ATAGS_OFFSET 0x1000 17 #define KEXEC_ARM_ZIMAGE_OFFSET 0x8000 18 19 #ifndef __ASSEMBLY__ 20 21 #define ARCH_HAS_KIMAGE_ARCH 22 struct kimage_arch { 23 u32 kernel_r2; 24 }; 25 26 /** 27 * crash_setup_regs() - save registers for the panic kernel 28 * @newregs: registers are saved here 29 * @oldregs: registers to be saved (may be %NULL) 30 * 31 * Function copies machine registers from @oldregs to @newregs. If @oldregs is 32 * %NULL then current registers are stored there. 33 */ 34 static inline void crash_setup_regs(struct pt_regs *newregs, 35 struct pt_regs *oldregs) 36 { 37 if (oldregs) { 38 memcpy(newregs, oldregs, sizeof(*newregs)); 39 } else { 40 __asm__ __volatile__ ( 41 "stmia %[regs_base], {r0-r12}\n\t" 42 "mov %[_ARM_sp], sp\n\t" 43 "str lr, %[_ARM_lr]\n\t" 44 "adr %[_ARM_pc], 1f\n\t" 45 "mrs %[_ARM_cpsr], cpsr\n\t" 46 "1:" 47 : [_ARM_pc] "=r" (newregs->ARM_pc), 48 [_ARM_cpsr] "=r" (newregs->ARM_cpsr), 49 [_ARM_sp] "=r" (newregs->ARM_sp), 50 [_ARM_lr] "=o" (newregs->ARM_lr) 51 : [regs_base] "r" (&newregs->ARM_r0) 52 : "memory" 53 ); 54 } 55 } 56 57 static inline unsigned long phys_to_boot_phys(phys_addr_t phys) 58 { 59 return phys_to_idmap(phys); 60 } 61 #define phys_to_boot_phys phys_to_boot_phys 62 63 static inline phys_addr_t boot_phys_to_phys(unsigned long entry) 64 { 65 return idmap_to_phys(entry); 66 } 67 #define boot_phys_to_phys boot_phys_to_phys 68 69 static inline unsigned long page_to_boot_pfn(struct page *page) 70 { 71 return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT); 72 } 73 #define page_to_boot_pfn page_to_boot_pfn 74 75 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn) 76 { 77 return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT)); 78 } 79 #define boot_pfn_to_page boot_pfn_to_page 80 81 #endif /* __ASSEMBLY__ */ 82 83 #endif /* _ARM_KEXEC_H */ 84