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 */ 30 static 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 */ 54 extern void (*kexec_reinit)(void); 55 56 static 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 62 static 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 68 static 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 74 static 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 */ 85