arch/s390/include/asm/kexec.h

   1 /*
   2  * include/asm-s390/kexec.h
   3  *
   4  * (C) Copyright IBM Corp. 2005
   5  *
   6  * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
   7  *
   8  */
   9
  10 #ifndef _S390_KEXEC_H
  11 #define _S390_KEXEC_H
  12
  13 #ifdef __KERNEL__
  14 #include <asm/page.h>
  15 #endif
  16 #include <asm/processor.h>
  17 /*
  18  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  19  * I.e. Maximum page that is mapped directly into kernel memory,
  20  * and kmap is not required.
  21  */
  22
  23 /* Maximum physical address we can use pages from */
  24 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  25
  26 /* Maximum address we can reach in physical address mode */
  27 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  28
  29 /* Maximum address we can use for the control pages */
  30 /* Not more than 2GB */
  31 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
  32
  33 /* Maximum address we can use for the crash control pages */
  34 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
  35
  36 /* Allocate one page for the pdp and the second for the code */
  37 #define KEXEC_CONTROL_PAGE_SIZE 4096
  38
  39 /* Alignment of crashkernel memory */
  40 #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
  41
  42 /* The native architecture */
  43 #define KEXEC_ARCH KEXEC_ARCH_S390
  44
  45 /*
  46  * Size for s390x ELF notes per CPU
  47  *
  48  * Seven notes plus zero note at the end: prstatus, fpregset, timer,
  49  * tod_cmp, tod_reg, control regs, and prefix
  50  */
  51 #define KEXEC_NOTE_BYTES \
  52         (ALIGN(sizeof(struct elf_note), 4) * 8 + \
  53          ALIGN(sizeof("CORE"), 4) * 7 + \
  54          ALIGN(sizeof(struct elf_prstatus), 4) + \
  55          ALIGN(sizeof(elf_fpregset_t), 4) + \
  56          ALIGN(sizeof(u64), 4) + \
  57          ALIGN(sizeof(u64), 4) + \
  58          ALIGN(sizeof(u32), 4) + \
  59          ALIGN(sizeof(u64) * 16, 4) + \
  60          ALIGN(sizeof(u32), 4) \
  61         )
  62
  63 /* Provide a dummy definition to avoid build failures. */
  64 static inline void crash_setup_regs(struct pt_regs *newregs,
  65                                         struct pt_regs *oldregs) { }
  66
  67 #endif /*_S390_KEXEC_H */