LXR linux/arch/arm64/include/asm/kexec.h

   1/*
   2 * kexec for arm64
   3 *
   4 * Copyright (C) Linaro.
   5 * Copyright (C) Huawei Futurewei Technologies.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#ifndef _ARM64_KEXEC_H
  13#define _ARM64_KEXEC_H
  14
  15/* Maximum physical address we can use pages from */
  16
  17#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  18
  19/* Maximum address we can reach in physical address mode */
  20
  21#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  22
  23/* Maximum address we can use for the control code buffer */
  24
  25#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  26
  27#define KEXEC_CONTROL_PAGE_SIZE 4096
  28
  29#define KEXEC_ARCH KEXEC_ARCH_AARCH64
  30
  31#ifndef __ASSEMBLY__
  32
  33/**
  34 * crash_setup_regs() - save registers for the panic kernel
  35 *
  36 * @newregs: registers are saved here
  37 * @oldregs: registers to be saved (may be %NULL)
  38 */
  39
  40static inline void crash_setup_regs(struct pt_regs *newregs,
  41                                    struct pt_regs *oldregs)
  42{
  43        if (oldregs) {
  44                memcpy(newregs, oldregs, sizeof(*newregs));
  45        } else {
  46                u64 tmp1, tmp2;
  47
  48                __asm__ __volatile__ (
  49                        "stp     x0,   x1, [%2, #16 *  0]\n"
  50                        "stp     x2,   x3, [%2, #16 *  1]\n"
  51                        "stp     x4,   x5, [%2, #16 *  2]\n"
  52                        "stp     x6,   x7, [%2, #16 *  3]\n"
  53                        "stp     x8,   x9, [%2, #16 *  4]\n"
  54                        "stp    x10,  x11, [%2, #16 *  5]\n"
  55                        "stp    x12,  x13, [%2, #16 *  6]\n"
  56                        "stp    x14,  x15, [%2, #16 *  7]\n"
  57                        "stp    x16,  x17, [%2, #16 *  8]\n"
  58                        "stp    x18,  x19, [%2, #16 *  9]\n"
  59                        "stp    x20,  x21, [%2, #16 * 10]\n"
  60                        "stp    x22,  x23, [%2, #16 * 11]\n"
  61                        "stp    x24,  x25, [%2, #16 * 12]\n"
  62                        "stp    x26,  x27, [%2, #16 * 13]\n"
  63                        "stp    x28,  x29, [%2, #16 * 14]\n"
  64                        "mov     %0,  sp\n"
  65                        "stp    x30,  %0,  [%2, #16 * 15]\n"
  66
  67                        "/* faked current PSTATE */\n"
  68                        "mrs     %0, CurrentEL\n"
  69                        "mrs     %1, SPSEL\n"
  70                        "orr     %0, %0, %1\n"
  71                        "mrs     %1, DAIF\n"
  72                        "orr     %0, %0, %1\n"
  73                        "mrs     %1, NZCV\n"
  74                        "orr     %0, %0, %1\n"
  75                        /* pc */
  76                        "adr     %1, 1f\n"
  77                "1:\n"
  78                        "stp     %1, %0,   [%2, #16 * 16]\n"
  79                        : "=&r" (tmp1), "=&r" (tmp2)
  80                        : "r" (newregs)
  81                        : "memory"
  82                );
  83        }
  84}
  85
  86#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
  87extern bool crash_is_nosave(unsigned long pfn);
  88extern void crash_prepare_suspend(void);
  89extern void crash_post_resume(void);
  90#else
  91static inline bool crash_is_nosave(unsigned long pfn) {return false; }
  92static inline void crash_prepare_suspend(void) {}
  93static inline void crash_post_resume(void) {}
  94#endif
  95
  96#endif /* __ASSEMBLY__ */
  97
  98#endif
  99