/*
   * Copyright (c) 2014-2015, Intel Corporation.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   */
  
  #ifndef __NVDIMM_PFN_H
  #define __NVDIMM_PFN_H
  
  #include <linux/types.h>

  #include <linux/mmzone.h>

  
  #define PFN_SIG_LEN 16
  #define PFN_SIG "NVDIMM_PFN_INFO\0"

  #define DAX_SIG "NVDIMM_DAX_INFO\0"

  
  struct nd_pfn_sb {
  	u8 signature[PFN_SIG_LEN];
  	u8 uuid[16];
  	u8 parent_uuid[16];
  	__le32 flags;
  	__le16 version_major;
  	__le16 version_minor;

  	__le64 dataoff; /* relative to namespace_base + start_pad */

  	__le64 npfns;
  	__le32 mode;

  	/* minor-version-1 additions for section alignment */
  	__le32 start_pad;
  	__le32 end_trunc;

  	/* minor-version-2 record the base alignment of the mapping */
  	__le32 align;
  	u8 padding[4000];

  	__le64 checksum;
  };

  
  #ifdef CONFIG_SPARSEMEM
  #define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
  #define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
  #else
  /*
   * In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
   * but we still want pmem to compile.
   */
  #define PFN_SECTION_ALIGN_DOWN(x) (x)
  #define PFN_SECTION_ALIGN_UP(x) (x)
  #endif

  
  #define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
  #define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))

  #endif /* __NVDIMM_PFN_H */