arch/arm/include/asm/kexec.h

   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 #endif /* __ASSEMBLY__ */
  57
  58 #endif /* CONFIG_KEXEC */
  59
  60 #endif /* _ARM_KEXEC_H */