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2023-08-17ARC: __switch_to: asm with dwarf ops (vs. inline asm)Vineet Gupta1-7/+2
__switch_to() is final step of context switch, swapping kernel modes stack (and callee regs) of outgoing task with next task. It is also the starting point of stack unwinging of a sleeping task and captures SP, FP, BLINK and the corresponding dwarf info. Back when dinosaurs still roamed around, ARC gas didn't support CFI pseudo ops and gcc was responsible for generating dwarf info. Thus it had to be written in "C" with inline asm to do the hand crafting of stack. The function prologue (and crucial saving of blink etc) was still gcc generated but not visible in code. Likewise dwarf info was missing. Now with modern tools, we can make things more obvious by writing the code in asm and adding approproate dwarf cfi pseudo ops. This is mostly non functional change, except for slight chnages to asm - ARCompact doesn't support MOV_S fp, sp, so we use MOV Signed-off-by: Vineet Gupta <[email protected]>
2022-10-02kbuild: use obj-y instead extra-y for objects placed at the headMasahiro Yamada1-2/+2
The objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a. This commit gets rid of the latter. Create vmlinux.a to collect all the objects that are unconditionally linked to vmlinux. The objects listed in head-y are moved to the head of vmlinux.a by using 'ar m'. With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y for builtin objects. There is no *.o that is directly linked to vmlinux. Drop unneeded code in scripts/clang-tools/gen_compile_commands.py. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/[email protected]/ Signed-off-by: Masahiro Yamada <[email protected]> Tested-by: Nick Desaulniers <[email protected]> Reviewed-by: Nicolas Schier <[email protected]>
2020-04-12arc: ptrace: hard-code "arc" instead of UTS_MACHINEMasahiro Yamada1-3/+0
ARC uses the UTS_MACHINE defined in the top Makefile as follows: UTS_MACHINE := $(ARCH) We know it is "arc" when we are building the kernel for ARC. Hard-code user_regset_view::name, like many other architectures do. Signed-off-by: Masahiro Yamada <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2020-01-17ARCv2: fpu: preserve userspace fpu stateVineet Gupta1-0/+2
Signed-off-by: Vineet Gupta <[email protected]>
2019-11-08ARC: ARCv2: jump label: implement jump label patchingEugeniy Paltsev1-0/+1
Implement jump label patching for ARC. Jump labels provide an interface to generate dynamic branches using self-modifying code. This allows us to implement conditional branches where changing branch direction is expensive but branch selection is basically 'free' This implementation uses 32-bit NOP and BRANCH instructions which forced to be aligned by 4 to guarantee that they don't cross L1 cache line boundary and can be update atomically. Signed-off-by: Eugeniy Paltsev <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner1-3/+1
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Enrico Weigelt <[email protected]> Reviewed-by: Kate Stewart <[email protected]> Reviewed-by: Allison Randal <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
2017-08-02ARC: Remove empty kernel/pcibios.cPalmer Dabbelt1-1/+0
ARC requires no arch-specific pcibios hooks, so delete this empty file. Signed-off-by: Palmer Dabbelt <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]>
2016-11-30clocksource: import ARC timer driverVineet Gupta1-1/+1
This adds support for - CONFIG_ARC_TIMERS : legacy 32-bit TIMER0 and TIMER1 which count UP from @CNT to @LIMIT, before optionally triggering an interrupt. These are programmed using ARC auxiliary register interface. These are present in all ARC cores (ARC700 and ARC HS38) TIMER0 serves as clockevent for all ARC linux builds. TIMER1 is used for clocksource in arc700 builds. - CONFIG_ARC_TIMERS_64BIT: 64-bit counters, RTC and GFRC found in ARC HS38 cores. These are independnet IP blocks with different programming model respectively. Link: http://lkml.kernel.org/r/20161111231132.GA4186@mai Acked-by: Daniel Lezcano <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2016-05-09ARC: RIP arc_{get|set}_core_freq() clk APIAlexey Brodkin1-1/+1
There are no more users of this - so RIP! Signed-off-by: Alexey Brodkin <[email protected]> [vgupta: update changelog] Signed-off-by: Vineet Gupta <[email protected]>
2016-03-10ARC: Add PCI supportJoao Pinto1-0/+1
Add PCI support to ARC and update drivers/pci Makefile enabling the ARC arch to use the generic PCI setup functions. [bhelgaas: fold in Joao's pci-dma-compat.h & pci-bridge.h build fix (I should have caught this myself, sorry] Signed-off-by: Joao Pinto <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Acked-by: Vineet Gupta <[email protected]>
2015-06-22ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et alVineet Gupta1-0/+1
Cc: Jason Cooper <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2015-06-22ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta1-1/+2
The notable features are: - SMP configurations of upto 4 cores with coherency - Optional L2 Cache and IO-Coherency - Revised Interrupt Architecture (multiple priorites, reg banks, auto stack switch, auto regfile save/restore) - MMUv4 (PIPT dcache, Huge Pages) - Instructions for * 64bit load/store: LDD, STD * Hardware assisted divide/remainder: DIV, REM * Function prologue/epilogue: ENTER_S, LEAVE_S * IRQ enable/disable: CLRI, SETI * pop count: FFS, FLS * SETcc, BMSKN, XBFU... Signed-off-by: Vineet Gupta <[email protected]>
2015-06-19ARC: intc: split into ARCompact ISA specific, common bitsVineet Gupta1-1/+1
Signed-off-by: Vineet Gupta <[email protected]>
2015-06-19ARC: entry.S: split into ARCompact ISA specific, common bitsVineet Gupta1-2/+2
Signed-off-by: Vineet Gupta <[email protected]>
2014-10-13ARC: rename kconfig option for unaligned emulationVineet Gupta1-1/+1
Signed-off-by: Vineet Gupta <[email protected]>
2013-11-12ARC: Add perf support for ARC700 coresMischa Jonker1-0/+1
This adds basic perf support for ARC700 cores. Most PERF_COUNT_HW* events are supported now. Signed-off-by: Mischa Jonker <[email protected]> Acked-by: Peter Zijlstra <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2013-02-15ARC: Hostlink Pseudo-Driver for Metaware DebuggerVineet Gupta1-0/+1
This allows ARC Target to do I/O to host in absence of any peripherals whatsoever, assisted by Metaware Hostlink facility. Further we have a FUSE based filesystem which makes us mount/access host filesystem on target and do fops. Signed-off-by: Vineet Gupta <[email protected]>
2013-02-15ARC: kgdb supportMischa Jonker1-0/+1
Signed-off-by: Mischa Jonker <[email protected]> Signed-off-by: Vineet Gupta <[email protected]> Cc: Jason Wessel <[email protected]> Acked-by: Jason Wessel <[email protected]>
2013-02-15ARC: Unaligned access emulationVineet Gupta1-0/+1
ARC700 doesn't natively support unaligned access, but can be emulated -Unaligned Access Exception -Disassembly at the Fault address to find the exact insn (long/short) Also per Arnd's comment, we runtime control it using 2 sysctl knobs: * SYSCTL_ARCH_UNALIGN_ALLOW: Runtime enable/disble * SYSCTL_ARCH_UNALIGN_NO_WARN: Warn on each emulation attempt Originally contributed by Tim Yao <[email protected]> Signed-off-by: Vineet Gupta <[email protected]> Cc: Tim Yao <[email protected]> Acked-by: Arnd Bergmann <[email protected]>
2013-02-15ARC: kprobes supportVineet Gupta1-0/+1
Origin port done by Rajeshwar Ranga Signed-off-by: Vineet Gupta <[email protected]> Cc: Rajeshwar Ranga <[email protected]>
2013-02-15ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul)Vineet Gupta1-1/+1
In-kernel disassembler Due Credits * Orig written by Rajeshwar Ranga * Consolidation/cleanups by Mischa Jonker Signed-off-by: Vineet Gupta <[email protected]> Cc: Rajeshwar Ranga <[email protected]> Cc: Mischa Jonker <[email protected]>
2013-02-15ARC: DWARF2 .debug_frame based stack unwinderVineet Gupta1-0/+6
-Originally written by Rajeshwar Ranga -Derived off of generic unwinder in 2.6.19 and adapted to ARC Signed-off-by: Vineet Gupta <[email protected]> Cc: Rajeshwar Ranga <[email protected]>
2013-02-15ARC: SMP supportVineet Gupta1-0/+1
ARC common code to enable a SMP system + ISS provided SMP extensions. ARC700 natively lacks SMP support, hence some of the core features are are only enabled if SoCs have the necessary h/w pixie-dust. This includes: -Inter Processor Interrupts (IPI) -Cache coherency -load-locked/store-conditional ... The low level exception handling would be completely broken in SMP because we don't have hardware assisted stack switching. Thus a fair bit of this code is repurposing the MMU_SCRATCH reg for event handler prologues to keep them re-entrant. Many thanks to Rajeshwar Ranga for his initial "major" contributions to SMP Port (back in 2008), and to Noam Camus and Gilad Ben-Yossef for help with resurrecting that in 3.2 kernel (2012). Note that this platform code is again singleton design pattern - so multiple SMP platforms won't build at the moment - this deficiency is addressed in subsequent patches within this series. Signed-off-by: Vineet Gupta <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Rajeshwar Ranga <[email protected]> Cc: Noam Camus <[email protected]> Cc: Gilad Ben-Yossef <[email protected]>
2013-02-15ARC: Module supportVineet Gupta1-0/+2
Signed-off-by: Vineet Gupta <[email protected]>
2013-02-15ARC: ptrace supportVineet Gupta1-0/+3
Signed-off-by: Vineet Gupta <[email protected]> Acked-by: Arnd Bergmann <[email protected]>
2013-02-15ARC: [DeviceTree] Basic supportVineet Gupta1-0/+1
This is minimal infrastructure needed for devicetree work. It uses an a sample "skeleton" devicetree - embedded in kernel image - to print the board, manufacturer by parsing the top-level "compatible" string. As of now we don't need any additional "board" specific "machine_desc". TODO: support interpreting the command line as boot-loader passed dtb Signed-off-by: Vineet Gupta <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Grant Likely <[email protected]> Cc: [email protected] Cc: Rob Herring <[email protected]> Cc: James Hogan <[email protected]> Reviewed-by: Rob Herring <[email protected]> Reviewed-by: James Hogan <[email protected]>
2013-02-11ARC: Build system: Makefiles, Kconfig, Linker scriptVineet Gupta1-0/+16
Arnd in his review pointed out that arch Kconfig organisation has several deficiencies: * Build time entries for things which can be runtime extracted from DT (e.g. SDRAM size, core clk frequency..) * Not multi-platform-image-build friendly (choice .. endchoice constructs) * cpu variants support (750/770) is exclusive. The first 2 have been fixed in subsequent patches. Due to the nature of the 750 and 770, it is not possible to build for both together, w/o special runtime glue code which would hurt performance. Signed-off-by: Vineet Gupta <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Sam Ravnborg <[email protected]> Acked-by: Sam Ravnborg <[email protected]>
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