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_CORE
  32 /* arch/sh/kernel/machine_kexec.c */
  33 void reserve_crashkernel(void);
  34
  35 static 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
  69 static inline void reserve_crashkernel(void) { }
  70 #endif /* CONFIG_KEXEC_CORE */
  71
  72 #endif /* __ASM_SH_KEXEC_H */