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linux/arch/mips/dec/int-handler.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

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 1995, 1996, 1997 Paul M. Antoine and Harald Koerfgen
* Copyright (C) 2000, 2001, 2002, 2003, 2005 Maciej W. Rozycki
*
* Written by Ralf Baechle and Andreas Busse, modified for DECstation
* support by Paul Antoine and Harald Koerfgen.
*
* completely rewritten:
* Copyright (C) 1998 Harald Koerfgen
*
* Rewritten extensively for controller-driven IRQ support
* by Maciej W. Rozycki.
*/
#include <asm/addrspace.h>
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/ioasic_ints.h>
#include <asm/dec/kn01.h>
#include <asm/dec/kn02.h>
#include <asm/dec/kn02xa.h>
#include <asm/dec/kn03.h>
#define KN02_CSR_BASE CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR)
#define KN02XA_IOASIC_BASE CKSEG1ADDR(KN02XA_SLOT_BASE + IOASIC_IOCTL)
#define KN03_IOASIC_BASE CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_IOCTL)
.text
.set noreorder
/*
* plat_irq_dispatch: Interrupt handler for DECstations
*
* We follow the model in the Indy interrupt code by David Miller, where he
* says: a lot of complication here is taken away because:
*
* 1) We handle one interrupt and return, sitting in a loop
* and moving across all the pending IRQ bits in the cause
* register is _NOT_ the answer, the common case is one
* pending IRQ so optimize in that direction.
*
* 2) We need not check against bits in the status register
* IRQ mask, that would make this routine slow as hell.
*
* 3) Linux only thinks in terms of all IRQs on or all IRQs
* off, nothing in between like BSD spl() brain-damage.
*
* Furthermore, the IRQs on the DECstations look basically (barring
* software IRQs which we don't use at all) like...
*
* DS2100/3100's, aka kn01, aka Pmax:
*
* MIPS IRQ Source
* -------- ------
* 0 Software (ignored)
* 1 Software (ignored)
* 2 SCSI
* 3 Lance Ethernet
* 4 DZ11 serial
* 5 RTC
* 6 Memory Controller & Video
* 7 FPU
*
* DS5000/200, aka kn02, aka 3max:
*
* MIPS IRQ Source
* -------- ------
* 0 Software (ignored)
* 1 Software (ignored)
* 2 TurboChannel
* 3 RTC
* 4 Reserved
* 5 Memory Controller
* 6 Reserved
* 7 FPU
*
* DS5000/1xx's, aka kn02ba, aka 3min:
*
* MIPS IRQ Source
* -------- ------
* 0 Software (ignored)
* 1 Software (ignored)
* 2 TurboChannel Slot 0
* 3 TurboChannel Slot 1
* 4 TurboChannel Slot 2
* 5 TurboChannel Slot 3 (ASIC)
* 6 Halt button
* 7 FPU/R4k timer
*
* DS5000/2x's, aka kn02ca, aka maxine:
*
* MIPS IRQ Source
* -------- ------
* 0 Software (ignored)
* 1 Software (ignored)
* 2 Periodic Interrupt (100usec)
* 3 RTC
* 4 I/O write timeout
* 5 TurboChannel (ASIC)
* 6 Halt Keycode from Access.Bus keyboard (CTRL-ALT-ENTER)
* 7 FPU/R4k timer
*
* DS5000/2xx's, aka kn03, aka 3maxplus:
*
* MIPS IRQ Source
* -------- ------
* 0 Software (ignored)
* 1 Software (ignored)
* 2 System Board (ASIC)
* 3 RTC
* 4 Reserved
* 5 Memory
* 6 Halt Button
* 7 FPU/R4k timer
*
* We handle the IRQ according to _our_ priority (see setup.c),
* then we just return. If multiple IRQs are pending then we will
* just take another exception, big deal.
*/
.align 5
NESTED(plat_irq_dispatch, PT_SIZE, ra)
.set noreorder
/*
* Get pending Interrupts
*/
mfc0 t0,CP0_CAUSE # get pending interrupts
mfc0 t1,CP0_STATUS
#ifdef CONFIG_32BIT
lw t2,cpu_fpu_mask
#endif
andi t0,ST0_IM # CAUSE.CE may be non-zero!
and t0,t1 # isolate allowed ones
beqz t0,spurious
#ifdef CONFIG_32BIT
and t2,t0
bnez t2,fpu # handle FPU immediately
#endif
/*
* Find irq with highest priority
*/
# open coded PTR_LA t1, cpu_mask_nr_tbl
#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
# open coded la t1, cpu_mask_nr_tbl
lui t1, %hi(cpu_mask_nr_tbl)
addiu t1, %lo(cpu_mask_nr_tbl)
#else
#error GCC `-msym32' option required for 64-bit DECstation builds
#endif
1: lw t2,(t1)
nop
and t2,t0
beqz t2,1b
addu t1,2*PTRSIZE # delay slot
/*
* Do the low-level stuff
*/
lw a0,(-PTRSIZE)(t1)
nop
bgez a0,handle_it # irq_nr >= 0?
# irq_nr < 0: it is an address
nop
jr a0
# a trick to save a branch:
lui t2,(KN03_IOASIC_BASE>>16)&0xffff
# upper part of IOASIC Address
/*
* Handle "IRQ Controller" Interrupts
* Masked Interrupts are still visible and have to be masked "by hand".
*/
FEXPORT(kn02_io_int) # 3max
lui t0,(KN02_CSR_BASE>>16)&0xffff
# get interrupt status and mask
lw t0,(t0)
nop
andi t1,t0,KN02_IRQ_ALL
b 1f
srl t0,16 # shift interrupt mask
FEXPORT(kn02xa_io_int) # 3min/maxine
lui t2,(KN02XA_IOASIC_BASE>>16)&0xffff
# upper part of IOASIC Address
FEXPORT(kn03_io_int) # 3max+ (t2 loaded earlier)
lw t0,IO_REG_SIR(t2) # get status: IOASIC sir
lw t1,IO_REG_SIMR(t2) # get mask: IOASIC simr
nop
1: and t0,t1 # mask out allowed ones
beqz t0,spurious
/*
* Find irq with highest priority
*/
# open coded PTR_LA t1,asic_mask_nr_tbl
#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
# open coded la t1, asic_mask_nr_tbl
lui t1, %hi(asic_mask_nr_tbl)
addiu t1, %lo(asic_mask_nr_tbl)
#else
#error GCC `-msym32' option required for 64-bit DECstation builds
#endif
2: lw t2,(t1)
nop
and t2,t0
beq zero,t2,2b
addu t1,2*PTRSIZE # delay slot
/*
* Do the low-level stuff
*/
lw a0,%lo(-PTRSIZE)(t1)
nop
bgez a0,handle_it # irq_nr >= 0?
# irq_nr < 0: it is an address
nop
jr a0
nop # delay slot
/*
* Dispatch low-priority interrupts. We reconsider all status
* bits again, which looks like a lose, but it makes the code
* simple and O(log n), so it gets compensated.
*/
FEXPORT(cpu_all_int) # HALT, timers, software junk
li a0,DEC_CPU_IRQ_BASE
srl t0,CAUSEB_IP
li t1,CAUSEF_IP>>CAUSEB_IP # mask
b 1f
li t2,4 # nr of bits / 2
FEXPORT(kn02_all_int) # impossible ?
li a0,KN02_IRQ_BASE
li t1,KN02_IRQ_ALL # mask
b 1f
li t2,4 # nr of bits / 2
FEXPORT(asic_all_int) # various I/O ASIC junk
li a0,IO_IRQ_BASE
li t1,IO_IRQ_ALL # mask
b 1f
li t2,8 # nr of bits / 2
/*
* Dispatch DMA interrupts -- O(log n).
*/
FEXPORT(asic_dma_int) # I/O ASIC DMA events
li a0,IO_IRQ_BASE+IO_INR_DMA
srl t0,IO_INR_DMA
li t1,IO_IRQ_DMA>>IO_INR_DMA # mask
li t2,8 # nr of bits / 2
/*
* Find irq with highest priority.
* Highest irq number takes precedence.
*/
1: srlv t3,t1,t2
2: xor t1,t3
and t3,t0,t1
beqz t3,3f
nop
move t0,t3
addu a0,t2
3: srl t2,1
bnez t2,2b
srlv t3,t1,t2
handle_it:
j dec_irq_dispatch
nop
#ifdef CONFIG_32BIT
fpu:
lw t0,fpu_kstat_irq
nop
lw t1,(t0)
nop
addu t1,1
j handle_fpe_int
sw t1,(t0)
#endif
spurious:
j spurious_interrupt
nop
END(plat_irq_dispatch)
/*
* Generic unimplemented interrupt routines -- cpu_mask_nr_tbl
* and asic_mask_nr_tbl are initialized to point all interrupts here.
* The tables are then filled in by machine-specific initialisation
* in dec_setup().
*/
FEXPORT(dec_intr_unimplemented)
move a1,t0 # cheats way of printing an arg!
PANIC("Unimplemented cpu interrupt! CP0_CAUSE: 0x%08x");
FEXPORT(asic_intr_unimplemented)
move a1,t0 # cheats way of printing an arg!
PANIC("Unimplemented asic interrupt! ASIC ISR: 0x%08x");
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