LXR linux/arch/s390/include/asm/kexec.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright IBM Corp. 2005
   4 *
   5 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
   6 *
   7 */
   8
   9#ifndef _S390_KEXEC_H
  10#define _S390_KEXEC_H
  11
  12#include <asm/processor.h>
  13#include <asm/page.h>
  14/*
  15 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  16 * I.e. Maximum page that is mapped directly into kernel memory,
  17 * and kmap is not required.
  18 */
  19
  20/* Maximum physical address we can use pages from */
  21#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  22
  23/* Maximum address we can reach in physical address mode */
  24#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  25
  26/* Maximum address we can use for the control pages */
  27/* Not more than 2GB */
  28#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
  29
  30/* Allocate control page with GFP_DMA */
  31#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
  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/* Provide a dummy definition to avoid build failures. */
  46static inline void crash_setup_regs(struct pt_regs *newregs,
  47                                        struct pt_regs *oldregs) { }
  48
  49struct kimage;
  50struct s390_load_data {
  51        /* Pointer to the kernel buffer. Used to register cmdline etc.. */
  52        void *kernel_buf;
  53
  54        /* Total size of loaded segments in memory. Used as an offset. */
  55        size_t memsz;
  56
  57        /* Load address of initrd. Used to register INITRD_START in kernel. */
  58        unsigned long initrd_load_addr;
  59};
  60
  61int kexec_file_add_purgatory(struct kimage *image,
  62                             struct s390_load_data *data);
  63int kexec_file_add_initrd(struct kimage *image,
  64                          struct s390_load_data *data,
  65                          char *initrd, unsigned long initrd_len);
  66int *kexec_file_update_kernel(struct kimage *iamge,
  67                              struct s390_load_data *data);
  68
  69extern const struct kexec_file_ops s390_kexec_image_ops;
  70extern const struct kexec_file_ops s390_kexec_elf_ops;
  71
  72#endif /*_S390_KEXEC_H */
  73