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#include <asm/setup.h>
  15/*
  16 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  17 * I.e. Maximum page that is mapped directly into kernel memory,
  18 * and kmap is not required.
  19 */
  20
  21/* Maximum physical address we can use pages from */
  22#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  23
  24/* Maximum address we can reach in physical address mode */
  25#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  26
  27/* Maximum address we can use for the control pages */
  28/* Not more than 2GB */
  29#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
  30
  31/* Allocate control page with GFP_DMA */
  32#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
  33
  34/* Maximum address we can use for the crash control pages */
  35#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
  36
  37/* Allocate one page for the pdp and the second for the code */
  38#define KEXEC_CONTROL_PAGE_SIZE 4096
  39
  40/* Alignment of crashkernel memory */
  41#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
  42
  43/* The native architecture */
  44#define KEXEC_ARCH KEXEC_ARCH_S390
  45
  46/* Allow kexec_file to load a segment to 0 */
  47#define KEXEC_BUF_MEM_UNKNOWN -1
  48
  49/* Provide a dummy definition to avoid build failures. */
  50static inline void crash_setup_regs(struct pt_regs *newregs,
  51                                        struct pt_regs *oldregs) { }
  52
  53struct kimage;
  54struct s390_load_data {
  55        /* Pointer to the kernel buffer. Used to register cmdline etc.. */
  56        void *kernel_buf;
  57
  58        /* Load address of the kernel_buf. */
  59        unsigned long kernel_mem;
  60
  61        /* Parmarea in the kernel buffer. */
  62        struct parmarea *parm;
  63
  64        /* Total size of loaded segments in memory. Used as an offset. */
  65        size_t memsz;
  66
  67        struct ipl_report *report;
  68};
  69
  70int s390_verify_sig(const char *kernel, unsigned long kernel_len);
  71void *kexec_file_add_components(struct kimage *image,
  72                                int (*add_kernel)(struct kimage *image,
  73                                                  struct s390_load_data *data));
  74int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
  75                         unsigned long addr);
  76
  77extern const struct kexec_file_ops s390_kexec_image_ops;
  78extern const struct kexec_file_ops s390_kexec_elf_ops;
  79
  80#endif /*_S390_KEXEC_H */
  81