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The powerpc kernel always requires an Open Firmware like device tree to supply device information. On systems without OF, this comes from a flattened device tree blob. This blob is usually generated by dtc, a tool which compiles a text description of the device tree into the flattened format used by the kernel. Sometimes, the bootwrapper makes small changes to the pre-compiled device tree blob (e.g. filling in the size of RAM). To do this it uses the libfdt library. Because these are only used on powerpc, the code for both these tools is included under arch/powerpc/boot (these were imported and are periodically updated from the upstream dtc tree). However, the microblaze architecture, currently being prepared for merging to mainline also uses dtc to produce device tree blobs. A few other archs have also mentioned some interest in using dtc. Therefore, this patch moves dtc and libfdt from arch/powerpc into scripts, where it can be used by any architecture. The vast bulk of this patch is a literal move, the rest is adjusting the various Makefiles to use dtc and libfdt correctly from their new locations. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#ifndef _FDT_H
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#define _FDT_H
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#ifndef __ASSEMBLY__
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struct fdt_header {
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uint32_t magic; /* magic word FDT_MAGIC */
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uint32_t totalsize; /* total size of DT block */
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uint32_t off_dt_struct; /* offset to structure */
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uint32_t off_dt_strings; /* offset to strings */
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uint32_t off_mem_rsvmap; /* offset to memory reserve map */
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uint32_t version; /* format version */
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uint32_t last_comp_version; /* last compatible version */
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/* version 2 fields below */
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uint32_t boot_cpuid_phys; /* Which physical CPU id we're
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booting on */
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/* version 3 fields below */
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uint32_t size_dt_strings; /* size of the strings block */
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/* version 17 fields below */
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uint32_t size_dt_struct; /* size of the structure block */
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};
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struct fdt_reserve_entry {
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uint64_t address;
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uint64_t size;
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};
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struct fdt_node_header {
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uint32_t tag;
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char name[0];
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};
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struct fdt_property {
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uint32_t tag;
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uint32_t len;
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uint32_t nameoff;
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char data[0];
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};
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#endif /* !__ASSEMBLY */
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#define FDT_MAGIC 0xd00dfeed /* 4: version, 4: total size */
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#define FDT_TAGSIZE sizeof(uint32_t)
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#define FDT_BEGIN_NODE 0x1 /* Start node: full name */
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#define FDT_END_NODE 0x2 /* End node */
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#define FDT_PROP 0x3 /* Property: name off,
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size, content */
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#define FDT_NOP 0x4 /* nop */
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#define FDT_END 0x9
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#define FDT_V1_SIZE (7*sizeof(uint32_t))
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#define FDT_V2_SIZE (FDT_V1_SIZE + sizeof(uint32_t))
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#define FDT_V3_SIZE (FDT_V2_SIZE + sizeof(uint32_t))
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#define FDT_V16_SIZE FDT_V3_SIZE
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#define FDT_V17_SIZE (FDT_V16_SIZE + sizeof(uint32_t))
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#endif /* _FDT_H */
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