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linux/arch/m68k/68000/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

242 lines
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* head.S - Common startup code for 68000 core based CPU's
*
* 2012.10.21, Luis Alves <ljalvs@gmail.com>, Single head.S file for all
* 68000 core based CPU's. Based on the sources from:
* Coldfire by Greg Ungerer <gerg@snapgear.com>
* 68328 by D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* The Silver Hammer Group, Ltd.
*
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
/*****************************************************************************
* UCSIMM and UCDIMM use CONFIG_MEMORY_RESERVE to reserve some RAM
*****************************************************************************/
#ifdef CONFIG_MEMORY_RESERVE
#define RAMEND (CONFIG_RAMBASE+CONFIG_RAMSIZE)-(CONFIG_MEMORY_RESERVE*0x100000)
#else
#define RAMEND (CONFIG_RAMBASE+CONFIG_RAMSIZE)
#endif
/*****************************************************************************/
.global _start
.global _rambase
.global _ramvec
.global _ramstart
.global _ramend
#if defined(CONFIG_PILOT) || defined(CONFIG_INIT_LCD)
.global bootlogo_bits
#endif
/* Defining DEBUG_HEAD_CODE, serial port in 68x328 is inited */
/* #define DEBUG_HEAD_CODE */
#undef DEBUG_HEAD_CODE
.data
/*****************************************************************************
* RAM setup pointers. Used by the kernel to determine RAM location and size.
*****************************************************************************/
_rambase:
.long 0
_ramvec:
.long 0
_ramstart:
.long 0
_ramend:
.long 0
__HEAD
/*****************************************************************************
* Entry point, where all begins!
*****************************************************************************/
_start:
/* Pilot need this specific signature at the start of ROM */
#ifdef CONFIG_PILOT
.byte 0x4e, 0xfa, 0x00, 0x0a /* bra opcode (jmp 10 bytes) */
.byte 'b', 'o', 'o', 't'
.word 10000
nop
moveq #0, %d0
movew %d0, 0xfffff618 /* Watchdog off */
movel #0x00011f07, 0xfffff114 /* CS A1 Mask */
#endif /* CONFIG_PILOT */
movew #0x2700, %sr /* disable all interrupts */
/*****************************************************************************
* Setup PLL and wait for it to settle (in 68x328 cpu's).
* Also, if enabled, init serial port.
*****************************************************************************/
#if defined(CONFIG_M68328) || \
defined(CONFIG_M68EZ328) || \
defined(CONFIG_M68VZ328)
/* Serial port setup. Should only be needed if debugging this startup code. */
#ifdef DEBUG_HEAD_CODE
movew #0x0800, 0xfffff906 /* Ignore CTS */
movew #0x010b, 0xfffff902 /* BAUD to 9600 */
movew #0xe100, 0xfffff900 /* enable */
#endif /* DEBUG_HEAD */
#ifdef CONFIG_PILOT
movew #0x2410, 0xfffff200 /* PLLCR */
#else
movew #0x2400, 0xfffff200 /* PLLCR */
#endif
movew #0x0123, 0xfffff202 /* PLLFSR */
moveq #0, %d0
movew #16384, %d0 /* PLL settle wait loop */
_pll_settle:
subw #1, %d0
bne _pll_settle
#endif /* CONFIG_M68x328 */
/*****************************************************************************
* If running kernel from ROM some specific initialization has to be done.
* (Assuming that everything is already init'ed when running from RAM)
*****************************************************************************/
#ifdef CONFIG_ROMKERNEL
/*****************************************************************************
* Init chip registers (uCsimm specific)
*****************************************************************************/
#ifdef CONFIG_UCSIMM
moveb #0x00, 0xfffffb0b /* Watchdog off */
moveb #0x10, 0xfffff000 /* SCR */
moveb #0x00, 0xfffff40b /* enable chip select */
moveb #0x00, 0xfffff423 /* enable /DWE */
moveb #0x08, 0xfffffd0d /* disable hardmap */
moveb #0x07, 0xfffffd0e /* level 7 interrupt clear */
movew #0x8600, 0xfffff100 /* FLASH at 0x10c00000 */
movew #0x018b, 0xfffff110 /* 2Meg, enable, 0ws */
movew #0x8f00, 0xfffffc00 /* DRAM configuration */
movew #0x9667, 0xfffffc02 /* DRAM control */
movew #0x0000, 0xfffff106 /* DRAM at 0x00000000 */
movew #0x068f, 0xfffff116 /* 8Meg, enable, 0ws */
moveb #0x40, 0xfffff300 /* IVR */
movel #0x007FFFFF, %d0 /* IMR */
movel %d0, 0xfffff304
moveb 0xfffff42b, %d0
andb #0xe0, %d0
moveb %d0, 0xfffff42b
#endif
/*****************************************************************************
* Init LCD controller.
* (Assuming that LCD controller is already init'ed when running from RAM)
*****************************************************************************/
#ifdef CONFIG_INIT_LCD
#ifdef CONFIG_PILOT
moveb #0, 0xfffffA27 /* LCKCON */
movel #_start, 0xfffffA00 /* LSSA */
moveb #0xa, 0xfffffA05 /* LVPW */
movew #0x9f, 0xFFFFFa08 /* LXMAX */
movew #0x9f, 0xFFFFFa0a /* LYMAX */
moveb #9, 0xfffffa29 /* LBAR */
moveb #0, 0xfffffa25 /* LPXCD */
moveb #0x04, 0xFFFFFa20 /* LPICF */
moveb #0x58, 0xfffffA27 /* LCKCON */
moveb #0x85, 0xfffff429 /* PFDATA */
moveb #0xd8, 0xfffffA27 /* LCKCON */
moveb #0xc5, 0xfffff429 /* PFDATA */
moveb #0xd5, 0xfffff429 /* PFDATA */
movel #bootlogo_bits, 0xFFFFFA00 /* LSSA */
moveb #10, 0xFFFFFA05 /* LVPW */
movew #160, 0xFFFFFA08 /* LXMAX */
movew #160, 0xFFFFFA0A /* LYMAX */
#else /* CONFIG_PILOT */
movel #bootlogo_bits, 0xfffffA00 /* LSSA */
moveb #0x28, 0xfffffA05 /* LVPW */
movew #0x280, 0xFFFFFa08 /* LXMAX */
movew #0x1df, 0xFFFFFa0a /* LYMAX */
moveb #0, 0xfffffa29 /* LBAR */
moveb #0, 0xfffffa25 /* LPXCD */
moveb #0x08, 0xFFFFFa20 /* LPICF */
moveb #0x01, 0xFFFFFA21 /* -ve pol */
moveb #0x81, 0xfffffA27 /* LCKCON */
movew #0xff00, 0xfffff412 /* LCD pins */
#endif /* CONFIG_PILOT */
#endif /* CONFIG_INIT_LCD */
/*****************************************************************************
* Kernel is running from FLASH/ROM (XIP)
* Copy init text & data to RAM
*****************************************************************************/
moveal #_etext, %a0
moveal #_sdata, %a1
moveal #__bss_start, %a2
_copy_initmem:
movel %a0@+, %a1@+
cmpal %a1, %a2
bhi _copy_initmem
#endif /* CONFIG_ROMKERNEL */
/*****************************************************************************
* Setup basic memory information for kernel
*****************************************************************************/
movel #CONFIG_VECTORBASE,_ramvec /* set vector base location */
movel #CONFIG_RAMBASE,_rambase /* set the base of RAM */
movel #RAMEND, _ramend /* set end ram addr */
lea __bss_stop,%a1
movel %a1,_ramstart
/*****************************************************************************
* If the kernel is in RAM, move romfs to right above bss and
* adjust _ramstart to where romfs ends.
*
* (Do this only if CONFIG_MTD_UCLINUX is true)
*****************************************************************************/
#if defined(CONFIG_ROMFS_FS) && defined(CONFIG_RAMKERNEL) && \
defined(CONFIG_MTD_UCLINUX)
lea __bss_start, %a0 /* get start of bss */
lea __bss_stop, %a1 /* set up destination */
movel %a0, %a2 /* copy of bss start */
movel 8(%a0), %d0 /* get size of ROMFS */
addql #8, %d0 /* allow for rounding */
andl #0xfffffffc, %d0 /* whole words */
addl %d0, %a0 /* copy from end */
addl %d0, %a1 /* copy from end */
movel %a1, _ramstart /* set start of ram */
_copy_romfs:
movel -(%a0), -(%a1) /* copy dword */
cmpl %a0, %a2 /* check if at end */
bne _copy_romfs
#endif /* CONFIG_ROMFS_FS && CONFIG_RAMKERNEL && CONFIG_MTD_UCLINUX */
/*****************************************************************************
* Clear bss region
*****************************************************************************/
lea __bss_start, %a0 /* get start of bss */
lea __bss_stop, %a1 /* get end of bss */
_clear_bss:
movel #0, (%a0)+ /* clear each word */
cmpl %a0, %a1 /* check if at end */
bne _clear_bss
/*****************************************************************************
* Load the current task pointer and stack.
*****************************************************************************/
lea init_thread_union,%a0
lea THREAD_SIZE(%a0),%sp
jsr start_kernel /* start Linux kernel */
_exit:
jmp _exit /* should never get here */
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