| Grant Likely | d8678b5 | 2009-10-15 10:57:53 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Definitions for working with the Flattened Device Tree data format |
| 3 | * |
| 4 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp |
| 5 | * benh@kernel.crashing.org |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * version 2 as published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _LINUX_OF_FDT_H |
| 13 | #define _LINUX_OF_FDT_H |
| 14 | |
| 15 | /* Definitions used by the flattened device tree */ |
| 16 | #define OF_DT_HEADER 0xd00dfeed /* marker */ |
| 17 | #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ |
| 18 | #define OF_DT_END_NODE 0x2 /* End node */ |
| 19 | #define OF_DT_PROP 0x3 /* Property: name off, size, |
| 20 | * content */ |
| 21 | #define OF_DT_NOP 0x4 /* nop */ |
| 22 | #define OF_DT_END 0x9 |
| 23 | |
| 24 | #define OF_DT_VERSION 0x10 |
| 25 | |
| Grant Likely | d45d94f | 2009-10-15 10:57:55 -0600 | [diff] [blame^] | 26 | #ifndef __ASSEMBLY__ |
| 27 | /* |
| 28 | * This is what gets passed to the kernel by prom_init or kexec |
| 29 | * |
| 30 | * The dt struct contains the device tree structure, full pathes and |
| 31 | * property contents. The dt strings contain a separate block with just |
| 32 | * the strings for the property names, and is fully page aligned and |
| 33 | * self contained in a page, so that it can be kept around by the kernel, |
| 34 | * each property name appears only once in this page (cheap compression) |
| 35 | * |
| 36 | * the mem_rsvmap contains a map of reserved ranges of physical memory, |
| 37 | * passing it here instead of in the device-tree itself greatly simplifies |
| 38 | * the job of everybody. It's just a list of u64 pairs (base/size) that |
| 39 | * ends when size is 0 |
| 40 | */ |
| 41 | struct boot_param_header { |
| 42 | u32 magic; /* magic word OF_DT_HEADER */ |
| 43 | u32 totalsize; /* total size of DT block */ |
| 44 | u32 off_dt_struct; /* offset to structure */ |
| 45 | u32 off_dt_strings; /* offset to strings */ |
| 46 | u32 off_mem_rsvmap; /* offset to memory reserve map */ |
| 47 | u32 version; /* format version */ |
| 48 | u32 last_comp_version; /* last compatible version */ |
| 49 | /* version 2 fields below */ |
| 50 | u32 boot_cpuid_phys; /* Physical CPU id we're booting on */ |
| 51 | /* version 3 fields below */ |
| 52 | u32 dt_strings_size; /* size of the DT strings block */ |
| 53 | /* version 17 fields below */ |
| 54 | u32 dt_struct_size; /* size of the DT structure block */ |
| 55 | }; |
| 56 | |
| 57 | #endif /* __ASSEMBLY__ */ |
| Grant Likely | d8678b5 | 2009-10-15 10:57:53 -0600 | [diff] [blame] | 58 | #endif /* _LINUX_OF_FDT_H */ |