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