LXR linux/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. */
  63static inline void crash_setup_regs(struct pt_regs *newregs,
  64                                        struct pt_regs *oldregs) { }
  65
  66#endif /*_S390_KEXEC_H */
  67