leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
10aaa3b7e9
linux/arch/m32r/kernel/head.S
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
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>
2017-11-02 11:10:55 +01:00

285 lines
5.8 KiB
ArmAsm
Raw Blame History

/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/arch/m32r/kernel/head.S
*
* M32R startup code.
*
* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
* Hitoshi Yamamoto
*/
#include <linux/init.h>
__INIT
__INITDATA
.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/assembler.h>
#include <asm/m32r.h>
#include <asm/mmu_context.h>
/*
* References to members of the boot_cpu_data structure.
*/
__HEAD
.global start_kernel
.global __bss_start
.global _end
ENTRY(stext)
ENTRY(_stext)
/* Setup up the stack pointer */
LDIMM (r0, spi_stack_top)
LDIMM (r1, spu_stack_top)
mvtc r0, spi
mvtc r1, spu
/* Initilalize PSW */
ldi r0, #0x0000 /* use SPI, disable EI */
mvtc r0, psw
/* Set up the stack pointer */
LDIMM (r0, stack_start)
ld r0, @r0
mvtc r0, spi
/*
* Clear BSS first so that there are no surprises...
*/
#ifdef CONFIG_ISA_DUAL_ISSUE
LDIMM (r2, __bss_start)
LDIMM (r3, _end)
sub r3, r2 ; BSS size in bytes
; R4 = BSS size in longwords (rounded down)
mv r4, r3 || ldi r1, #0
srli r4, #4 || addi r2, #-4
beqz r4, .Lendloop1
.Lloop1:
#ifndef CONFIG_CHIP_M32310
; Touch memory for the no-write-allocating cache.
ld r0, @(4,r2)
#endif
st r1, @+r2 || addi r4, #-1
st r1, @+r2
st r1, @+r2
st r1, @+r2 || cmpeq r1, r4 ; R4 = 0?
bnc .Lloop1
.Lendloop1:
and3 r4, r3, #15
addi r2, #4
beqz r4, .Lendloop2
.Lloop2:
stb r1, @r2 || addi r4, #-1
addi r2, #1
bnez r4, .Lloop2
.Lendloop2:
#else /* not CONFIG_ISA_DUAL_ISSUE */
LDIMM (r2, __bss_start)
LDIMM (r3, _end)
sub r3, r2 ; BSS size in bytes
mv r4, r3
srli r4, #2 ; R4 = BSS size in longwords (rounded down)
ldi r1, #0 ; clear R1 for longwords store
addi r2, #-4 ; account for pre-inc store
beqz r4, .Lendloop1 ; any more to go?
.Lloop1:
st r1, @+r2 ; yep, zero out another longword
addi r4, #-1 ; decrement count
bnez r4, .Lloop1 ; go do some more
.Lendloop1:
and3 r4, r3, #3 ; get no. of remaining BSS bytes to clear
addi r2, #4 ; account for pre-inc store
beqz r4, .Lendloop2 ; any more to go?
.Lloop2:
stb r1, @r2 ; yep, zero out another byte
addi r2, #1 ; bump address
addi r4, #-1 ; decrement count
bnez r4, .Lloop2 ; go do some more
.Lendloop2:
#endif /* not CONFIG_ISA_DUAL_ISSUE */
#if 0 /* M32R_FIXME */
/*
* Copy data segment from ROM to RAM.
*/
.global ROM_D, TOP_DATA, END_DATA
LDIMM (r1, ROM_D)
LDIMM (r2, TOP_DATA)
LDIMM (r3, END_DATA)
addi r2, #-4
addi r3, #-4
loop1:
ld r0, @r1+
st r0, @+r2
cmp r2, r3
bc loop1
#endif /* 0 */
/* Jump to kernel */
LDIMM (r2, start_kernel)
jl r2
.fillinsn
1:
bra 1b ; main should never return here, but
; just in case, we know what happens.
#ifdef CONFIG_SMP
/*
* AP startup routine
*/
.global eit_vector
ENTRY(startup_AP)
;; setup EVB
LDIMM (r4, eit_vector)
mvtc r4, cr5
;; enable MMU
LDIMM (r2, init_tlb)
jl r2
seth r4, #high(MATM)
or3 r4, r4, #low(MATM)
ldi r5, #0x01
st r5, @r4 ; Set MATM Reg(T bit ON)
ld r6, @r4 ; MATM Check
LDIMM (r5, 1f)
jmp r5 ; enable MMU
nop
.fillinsn
1:
;; ISN check
ld r6, @r4 ; MATM Check
seth r4, #high(M32R_ICU_ISTS_ADDR)
or3 r4, r4, #low(M32R_ICU_ISTS_ADDR)
ld r5, @r4 ; Read ISTSi reg.
mv r6, r5
slli r5, #13 ; PIML check
srli r5, #13 ;
seth r4, #high(M32R_ICU_IMASK_ADDR)
or3 r4, r4, #low(M32R_ICU_IMASK_ADDR)
st r5, @r4 ; Write IMASKi reg.
slli r6, #4 ; ISN check
srli r6, #26 ;
seth r4, #high(M32R_IRQ_IPI5)
or3 r4, r4, #low(M32R_IRQ_IPI5)
bne r4, r6, 2f ; if (ISN != CPU_BOOT_IPI) goto sleep;
;; check cpu_bootout_map and set cpu_bootin_map
LDIMM (r4, cpu_bootout_map)
ld r4, @r4
seth r5, #high(M32R_CPUID_PORTL)
or3 r5, r5, #low(M32R_CPUID_PORTL)
ld r5, @r5
ldi r6, #1
sll r6, r5
and r4, r6
beqz r4, 2f
LDIMM (r4, cpu_bootin_map)
ld r5, @r4
or r5, r6
st r6, @r4
;; clear PSW
ldi r4, #0
mvtc r4, psw
;; setup SPI
LDIMM (r4, stack_start)
ld r4, @r4
mvtc r4, spi
;; setup BPC (start_secondary)
LDIMM (r4, start_secondary)
mvtc r4, bpc
rte ; goto startup_secondary
nop
nop
.fillinsn
2:
;; disable MMU
seth r4, #high(MATM)
or3 r4, r4, #low(MATM)
ldi r5, #0
st r5, @r4 ; Set MATM Reg(T bit OFF)
ld r6, @r4 ; MATM Check
LDIMM (r4, 3f)
seth r5, #high(__PAGE_OFFSET)
or3 r5, r5, #low(__PAGE_OFFSET)
not r5, r5
and r4, r5
jmp r4 ; disable MMU
nop
.fillinsn
3:
;; SLEEP and wait IPI
LDIMM (r4, AP_loop)
seth r5, #high(__PAGE_OFFSET)
or3 r5, r5, #low(__PAGE_OFFSET)
not r5, r5
and r4, r5
jmp r4
nop
nop
#endif /* CONFIG_SMP */
.text
ENTRY(stack_start)
.long init_thread_union+8192
.long __KERNEL_DS
/*
* This is initialized to create a identity-mapping at 0-4M (for bootup
* purposes) and another mapping of the 0-4M area at virtual address
* PAGE_OFFSET.
*/
.text
#define MOUNT_ROOT_RDONLY 1
#define RAMDISK_FLAGS 0 ; 1024KB
#define ORIG_ROOT_DEV 0x0100 ; /dev/ram0 (major:01, minor:00)
#define LOADER_TYPE 1 ; (??? - non-zero value seems
; to be needed to boot from initrd)
#define COMMAND_LINE ""
.section .empty_zero_page, "aw"
ENTRY(empty_zero_page)
.long MOUNT_ROOT_RDONLY /* offset: +0x00 */
.long RAMDISK_FLAGS
.long ORIG_ROOT_DEV
.long LOADER_TYPE
.long 0 /* INITRD_START */ /* +0x10 */
.long 0 /* INITRD_SIZE */
.long 0 /* CPU_CLOCK */
.long 0 /* BUS_CLOCK */
.long 0 /* TIMER_DIVIDE */ /* +0x20 */
.balign 256,0
.asciz COMMAND_LINE
.byte 0
.balign 4096,0,4096
/*------------------------------------------------------------------------
* Stack area
*/
.section .init.data, "aw"
ALIGN
.global spi_stack_top
.zero 1024
spi_stack_top:
.section .init.data, "aw"
ALIGN
.global spu_stack_top
.zero 1024
spu_stack_top:
.end
Reference in New Issue View Git Blame Copy Permalink