text: #ifndef _POWERPC_PROM_H
  #define _POWERPC_PROM_H
  #ifdef __KERNEL__
  
  /*
   * Definitions for talking to the Open Firmware PROM on
   * Power Macintosh computers.
   *
   * Copyright (C) 1996-2005 Paul Mackerras.
   *
   * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  #include <linux/types.h>
  #include <asm/irq.h>
  #include <linux/atomic.h>
  
  /* These includes should be removed once implicit includes are cleaned up. */
  #include <linux/of.h>
  #include <linux/of_fdt.h>
  #include <linux/of_address.h>
  #include <linux/of_irq.h>
  #include <linux/platform_device.h>
  
  #define OF_DT_BEGIN_NODE	0x1		/* Start of node, full name */
  #define OF_DT_END_NODE		0x2		/* End node */
  #define OF_DT_PROP		0x3		/* Property: name off, size,
  						 * content */
  #define OF_DT_NOP		0x4		/* nop */
  #define OF_DT_END		0x9
  
  #define OF_DT_VERSION		0x10
  
  /*
   * This is what gets passed to the kernel by prom_init or kexec
   *
   * The dt struct contains the device tree structure, full pathes and
   * property contents. The dt strings contain a separate block with just
   * the strings for the property names, and is fully page aligned and
   * self contained in a page, so that it can be kept around by the kernel,
   * each property name appears only once in this page (cheap compression)
   *
   * the mem_rsvmap contains a map of reserved ranges of physical memory,
   * passing it here instead of in the device-tree itself greatly simplifies
   * the job of everybody. It's just a list of u64 pairs (base/size) that
   * ends when size is 0
   */
  struct boot_param_header {
  	__be32	magic;			/* magic word OF_DT_HEADER */
  	__be32	totalsize;		/* total size of DT block */
  	__be32	off_dt_struct;		/* offset to structure */
  	__be32	off_dt_strings;		/* offset to strings */
  	__be32	off_mem_rsvmap;		/* offset to memory reserve map */
  	__be32	version;		/* format version */
  	__be32	last_comp_version;	/* last compatible version */
  	/* version 2 fields below */
  	__be32	boot_cpuid_phys;	/* Physical CPU id we're booting on */
  	/* version 3 fields below */
  	__be32	dt_strings_size;	/* size of the DT strings block */
  	/* version 17 fields below */
  	__be32	dt_struct_size;		/* size of the DT structure block */
  };
  
  /*
   * OF address retreival & translation
   */
  
  /* Parse the ibm,dma-window property of an OF node into the busno, phys and
   * size parameters.
   */
  void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window,
  			 unsigned long *busno, unsigned long *phys,
  			 unsigned long *size);
  
  extern void of_instantiate_rtc(void);
  
  extern int of_get_ibm_chip_id(struct device_node *np);
  
  /* The of_drconf_cell struct defines the layout of the LMB array
   * specified in the device tree property
   * ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
   */
  struct of_drconf_cell {
  	u64	base_addr;
  	u32	drc_index;
  	u32	reserved;
  	u32	aa_index;
  	u32	flags;
  };
  
  #define DRCONF_MEM_ASSIGNED	0x00000008
  #define DRCONF_MEM_AI_INVALID	0x00000040
  #define DRCONF_MEM_RESERVED	0x00000080
  
  /*
   * There are two methods for telling firmware what our capabilities are.
   * Newer machines have an "ibm,client-architecture-support" method on the
   * root node.  For older machines, we have to call the "process-elf-header"
   * method in the /packages/elf-loader node, passing it a fake 32-bit
   * ELF header containing a couple of PT_NOTE sections that contain
   * structures that contain various information.
   */
  
  /* New method - extensible architecture description vector. */
  
  /* Option vector bits - generic bits in byte 1 */
  #define OV_IGNORE		0x80	/* ignore this vector */
  #define OV_CESSATION_POLICY	0x40	/* halt if unsupported option present*/
  
  /* Option vector 1: processor architectures supported */
  #define OV1_PPC_2_00		0x80	/* set if we support PowerPC 2.00 */
  #define OV1_PPC_2_01		0x40	/* set if we support PowerPC 2.01 */
  #define OV1_PPC_2_02		0x20	/* set if we support PowerPC 2.02 */
  #define OV1_PPC_2_03		0x10	/* set if we support PowerPC 2.03 */
  #define OV1_PPC_2_04		0x08	/* set if we support PowerPC 2.04 */
  #define OV1_PPC_2_05		0x04	/* set if we support PowerPC 2.05 */
  #define OV1_PPC_2_06		0x02	/* set if we support PowerPC 2.06 */
  #define OV1_PPC_2_07		0x01	/* set if we support PowerPC 2.07 */
  
  #define OV1_PPC_3_00		0x80	/* set if we support PowerPC 3.00 */
  
  /* Option vector 2: Open Firmware options supported */
  #define OV2_REAL_MODE		0x20	/* set if we want OF in real mode */
  
  /* Option vector 3: processor options supported */
  #define OV3_FP			0x80	/* floating point */
  #define OV3_VMX			0x40	/* VMX/Altivec */
  #define OV3_DFP			0x20	/* decimal FP */
  
  /* Option vector 4: IBM PAPR implementation */
  #define OV4_MIN_ENT_CAP		0x01	/* minimum VP entitled capacity */
  
  /* Option vector 5: PAPR/OF options supported
   * These bits are also used in firmware_has_feature() to validate
   * the capabilities reported for vector 5 in the device tree so we
   * encode the vector index in the define and use the OV5_FEAT()
   * and OV5_INDX() macros to extract the desired information.
   */
  #define OV5_FEAT(x)	((x) & 0xff)
  #define OV5_INDX(x)	((x) >> 8)
  #define OV5_LPAR		0x0280	/* logical partitioning supported */
  #define OV5_SPLPAR		0x0240	/* shared-processor LPAR supported */
  /* ibm,dynamic-reconfiguration-memory property supported */
  #define OV5_DRCONF_MEMORY	0x0220
  #define OV5_LARGE_PAGES		0x0210	/* large pages supported */
  #define OV5_DONATE_DEDICATE_CPU	0x0202	/* donate dedicated CPU support */
  #define OV5_MSI			0x0201	/* PCIe/MSI support */
  #define OV5_CMO			0x0480	/* Cooperative Memory Overcommitment */
  #define OV5_XCMO		0x0440	/* Page Coalescing */
  #define OV5_TYPE1_AFFINITY	0x0580	/* Type 1 NUMA affinity */
  #define OV5_PRRN		0x0540	/* Platform Resource Reassignment */
  #define OV5_HP_EVT		0x0604	/* Hot Plug Event support */
  #define OV5_RESIZE_HPT		0x0601	/* Hash Page Table resizing */
  #define OV5_PFO_HW_RNG		0x1180	/* PFO Random Number Generator */
  #define OV5_PFO_HW_842		0x1140	/* PFO Compression Accelerator */
  #define OV5_PFO_HW_ENCR		0x1120	/* PFO Encryption Accelerator */
  #define OV5_SUB_PROCESSORS	0x1501	/* 1,2,or 4 Sub-Processors supported */
  #define OV5_XIVE_EXPLOIT	0x1701	/* XIVE exploitation supported */
  /* MMU Base Architecture */
  #define OV5_MMU_SUPPORT		0x18C0	/* MMU Mode Support Mask */
  #define OV5_MMU_HASH		0x1800	/* Hash MMU Only */
  #define OV5_MMU_RADIX		0x1840	/* Radix MMU Only */
  #define OV5_MMU_EITHER		0x1880	/* Hash or Radix Supported */
  #define OV5_MMU_DYNAMIC		0x18C0	/* Hash or Radix Can Switch Later */
  #define OV5_NMMU		0x1820	/* Nest MMU Available */
  /* Hash Table Extensions */
  #define OV5_HASH_SEG_TBL	0x1980	/* In Memory Segment Tables Available */
  #define OV5_HASH_GTSE		0x1940	/* Guest Translation Shoot Down Avail */
  /* Radix Table Extensions */
  #define OV5_RADIX_GTSE		0x1A40	/* Guest Translation Shoot Down Avail */
  
  /* Option Vector 6: IBM PAPR hints */
  #define OV6_LINUX		0x02	/* Linux is our OS */
  
  #endif /* __KERNEL__ */
  #endif /* _POWERPC_PROM_H */
  