arch/s390/include/asm/kexec.h

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