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 /* 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 */