arch/arm/include/asm/kexec.h

   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 */