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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_KEXEC_H
   3#define __ASM_SH_KEXEC_H
   4
   5#include <asm/ptrace.h>
   6#include <asm/string.h>
   7#include <linux/kernel.h>
   8
   9/*
  10 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  11 * I.e. Maximum page that is mapped directly into kernel memory,
  12 * and kmap is not required.
  13 *
  14 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
  15 * calculation for the amount of memory directly mappable into the
  16 * kernel memory space.
  17 */
  18
  19/* Maximum physical address we can use pages from */
  20#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  21/* Maximum address we can reach in physical address mode */
  22#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  23/* Maximum address we can use for the control code buffer */
  24#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  25
  26#define KEXEC_CONTROL_PAGE_SIZE 4096
  27
  28/* The native architecture */
  29#define KEXEC_ARCH KEXEC_ARCH_SH
  30
  31#ifdef CONFIG_KEXEC
  32/* arch/sh/kernel/machine_kexec.c */
  33void reserve_crashkernel(void);
  34
  35static inline void crash_setup_regs(struct pt_regs *newregs,
  36                                    struct pt_regs *oldregs)
  37{
  38        if (oldregs)
  39                memcpy(newregs, oldregs, sizeof(*newregs));
  40        else {
  41                __asm__ __volatile__ ("mov r0, %0" : "=r" (newregs->regs[0]));
  42                __asm__ __volatile__ ("mov r1, %0" : "=r" (newregs->regs[1]));
  43                __asm__ __volatile__ ("mov r2, %0" : "=r" (newregs->regs[2]));
  44                __asm__ __volatile__ ("mov r3, %0" : "=r" (newregs->regs[3]));
  45                __asm__ __volatile__ ("mov r4, %0" : "=r" (newregs->regs[4]));
  46                __asm__ __volatile__ ("mov r5, %0" : "=r" (newregs->regs[5]));
  47                __asm__ __volatile__ ("mov r6, %0" : "=r" (newregs->regs[6]));
  48                __asm__ __volatile__ ("mov r7, %0" : "=r" (newregs->regs[7]));
  49                __asm__ __volatile__ ("mov r8, %0" : "=r" (newregs->regs[8]));
  50                __asm__ __volatile__ ("mov r9, %0" : "=r" (newregs->regs[9]));
  51                __asm__ __volatile__ ("mov r10, %0" : "=r" (newregs->regs[10]));
  52                __asm__ __volatile__ ("mov r11, %0" : "=r" (newregs->regs[11]));
  53                __asm__ __volatile__ ("mov r12, %0" : "=r" (newregs->regs[12]));
  54                __asm__ __volatile__ ("mov r13, %0" : "=r" (newregs->regs[13]));
  55                __asm__ __volatile__ ("mov r14, %0" : "=r" (newregs->regs[14]));
  56                __asm__ __volatile__ ("mov r15, %0" : "=r" (newregs->regs[15]));
  57
  58                __asm__ __volatile__ ("sts pr, %0" : "=r" (newregs->pr));
  59                __asm__ __volatile__ ("sts macl, %0" : "=r" (newregs->macl));
  60                __asm__ __volatile__ ("sts mach, %0" : "=r" (newregs->mach));
  61
  62                __asm__ __volatile__ ("stc gbr, %0" : "=r" (newregs->gbr));
  63                __asm__ __volatile__ ("stc sr, %0" : "=r" (newregs->sr));
  64
  65                newregs->pc = _THIS_IP_;
  66        }
  67}
  68#else
  69static inline void reserve_crashkernel(void) { }
  70#endif /* CONFIG_KEXEC */
  71
  72#endif /* __ASM_SH_KEXEC_H */
  73