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b24413180f
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
99 lines
3.7 KiB
C
99 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_NOHASH_32_PTE_44x_H
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#define _ASM_POWERPC_NOHASH_32_PTE_44x_H
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#ifdef __KERNEL__
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/*
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* Definitions for PPC440
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*
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* Because of the 3 word TLB entries to support 36-bit addressing,
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* the attribute are difficult to map in such a fashion that they
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* are easily loaded during exception processing. I decided to
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* organize the entry so the ERPN is the only portion in the
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* upper word of the PTE and the attribute bits below are packed
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* in as sensibly as they can be in the area below a 4KB page size
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* oriented RPN. This at least makes it easy to load the RPN and
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* ERPN fields in the TLB. -Matt
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*
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* This isn't entirely true anymore, at least some bits are now
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* easier to move into the TLB from the PTE. -BenH.
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*
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* Note that these bits preclude future use of a page size
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* less than 4KB.
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*
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*
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* PPC 440 core has following TLB attribute fields;
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*
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* TLB1:
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* 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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* RPN................................. - - - - - - ERPN.......
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*
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* TLB2:
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* 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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* - - - - - - U0 U1 U2 U3 W I M G E - UX UW UR SX SW SR
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*
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* Newer 440 cores (440x6 as used on AMCC 460EX/460GT) have additional
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* TLB2 storage attribute fields. Those are:
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*
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* TLB2:
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* 0...10 11 12 13 14 15 16...31
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* no change WL1 IL1I IL1D IL2I IL2D no change
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*
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* There are some constrains and options, to decide mapping software bits
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* into TLB entry.
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*
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* - PRESENT *must* be in the bottom three bits because swap cache
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* entries use the top 29 bits for TLB2.
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*
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* - CACHE COHERENT bit (M) has no effect on original PPC440 cores,
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* because it doesn't support SMP. However, some later 460 variants
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* have -some- form of SMP support and so I keep the bit there for
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* future use
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*
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* With the PPC 44x Linux implementation, the 0-11th LSBs of the PTE are used
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* for memory protection related functions (see PTE structure in
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* include/asm-ppc/mmu.h). The _PAGE_XXX definitions in this file map to the
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* above bits. Note that the bit values are CPU specific, not architecture
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* specific.
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*
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* The kernel PTE entry holds an arch-dependent swp_entry structure under
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* certain situations. In other words, in such situations some portion of
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* the PTE bits are used as a swp_entry. In the PPC implementation, the
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* 3-24th LSB are shared with swp_entry, however the 0-2nd three LSB still
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* hold protection values. That means the three protection bits are
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* reserved for both PTE and SWAP entry at the most significant three
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* LSBs.
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*
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* There are three protection bits available for SWAP entry:
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* _PAGE_PRESENT
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* _PAGE_HASHPTE (if HW has)
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*
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* So those three bits have to be inside of 0-2nd LSB of PTE.
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*
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*/
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#define _PAGE_PRESENT 0x00000001 /* S: PTE valid */
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#define _PAGE_RW 0x00000002 /* S: Write permission */
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#define _PAGE_EXEC 0x00000004 /* H: Execute permission */
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#define _PAGE_ACCESSED 0x00000008 /* S: Page referenced */
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#define _PAGE_DIRTY 0x00000010 /* S: Page dirty */
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#define _PAGE_SPECIAL 0x00000020 /* S: Special page */
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#define _PAGE_USER 0x00000040 /* S: User page */
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#define _PAGE_ENDIAN 0x00000080 /* H: E bit */
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#define _PAGE_GUARDED 0x00000100 /* H: G bit */
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#define _PAGE_COHERENT 0x00000200 /* H: M bit */
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#define _PAGE_NO_CACHE 0x00000400 /* H: I bit */
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#define _PAGE_WRITETHRU 0x00000800 /* H: W bit */
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/* TODO: Add large page lowmem mapping support */
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#define _PMD_PRESENT 0
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#define _PMD_PRESENT_MASK (PAGE_MASK)
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#define _PMD_BAD (~PAGE_MASK)
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/* ERPN in a PTE never gets cleared, ignore it */
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#define _PTE_NONE_MASK 0xffffffff00000000ULL
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_NOHASH_32_PTE_44x_H */
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