kernel/linux.git/arch/arc/include/asm/arcregs.h, branch linux-7.0.y

mm: replace (20 - PAGE_SHIFT) with common macros for pages<->MB conversion

2025-09-13T23:54:42+00:00

Replace repeated (20 - PAGE_SHIFT) calculations with standard macros: - MB_TO_PAGES(mb) converts MB to page count - PAGES_TO_MB(pages) converts pages to MB No functional change. [akpm@linux-foundation.org: remove arc's private PAGES_TO_MB, remove its unused PAGES_TO_KB] [akpm@linux-foundation.org: don't include mm.h due to include file ordering mess] Link: https://lkml.kernel.org/r/20250718024134.1304745-1-ye.liu@linux.dev Signed-off-by: Ye Liu Acked-by: Zi Yan Reviewed-by: Lorenzo Stoakes Reviewed-by: Dev Jain Acked-by: David Hildenbrand Acked-by: Chris Li Cc: Baolin Wang Cc: Baoquan He Cc: Barry Song Cc: Ben Segall Cc: Boqun Feng Cc: Davidlohr Bueso Cc: Dietmar Eggemann Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Josh Triplett Cc: Juri Lelli Cc: Kairui Song Cc: Kemeng Shi Cc: Lai jiangshan Cc: Liam Howlett Cc: Mariano Pache Cc: Mathieu Desnoyers Cc: Mel Gorman Cc: Michal Hocko Cc: Mike Rapoport Cc: Neeraj Upadhyay Cc: Nhat Pham Cc: "Paul E . McKenney" Cc: Peter Zijlstra Cc: Ryan Roberts Cc: Steven Rostedt Cc: Suren Baghdasaryan Cc: "Uladzislau Rezki (Sony)" Cc: Valentin Schneider Cc: Vincent Guittot Cc: Vlastimil Babka Signed-off-by: Andrew Morton

ARC: Replace ASSEMBLY with ASSEMBLER in the non-uapi headers

2025-06-09T16:18:12+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Thomas Huth Signed-off-by: Vineet Gupta

arc: rename aux.h to arc_aux.h

2024-12-10T18:12:56+00:00

The goal is to clean-up Linux repository from AUX file names, because the use of such file names is prohibited on other operating systems such as Windows, so the Linux repository cannot be cloned and edited on them. Reviewed-by: Shahab Vahedi Signed-off-by: Benjamin Szőke Signed-off-by: Vineet Gupta

ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA

2023-08-18T03:31:59+00:00

- boot log now clearly per ISA - global struct cpuinfo_arc[] elimiated - local struct struct arcinfo kept for passing info between functions Tested-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202308162101.Ve5jBg80-lkp@intel.com Signed-off-by: Vineet Gupta

ARC: boot log: eliminate struct cpuinfo_arc #3: don't export

2023-08-18T03:31:59+00:00

Signed-off-by: Vineet Gupta

ARC: boot log: eliminate struct cpuinfo_arc #2: cache

2023-08-18T03:31:59+00:00

Signed-off-by: Vineet Gupta

ARC: boot log: eliminate struct cpuinfo_arc #1: mm

2023-08-18T03:31:57+00:00

This is first step in eliminating struct cpuinfo_arc[NR_CPUS] Back when we had just ARCompact ISA, the idea was to read/bit-fiddle the BCRs once and and cache decoded information in a global struct ready to use. With ARCv2 it was modified to contained abstract / ISA agnostic information. However with ARCv3 there 's too much disparity to abstract in common structures. So drop the entire decode once and store paradigm. Afterall there's only 2 users of this machinery anyways: boot printing and cat /proc/cpuinfo. None is performance critical to warrant locking away resident memory per cpu. This patch is first step in that direction - decouples struct cpuinfo_arc_mmu from global struct cpuinfo_arc - mmu code still has a trimmed down static version of struct cpuinfo_arc_mmu to cache information needed in performance critical code such as tlb flush routines - folds read_decode_mmu_bcr() into arc_mmu_mumbojumbo() - setup_processor() directly calls arc_mmu_init() and not via arc_cpu_init() Tested-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202308151213.qKZPMiyz-lkp@intel.com/ Signed-off-by: Vineet Gupta

ARC: allow userspace DSP applications to use AGU extensions

2020-03-16T17:30:49+00:00

To be able to run DSP-enabled userspace applications with AGU (address generation unit) extensions we additionally need to save and restore following registers at context switch: * AGU_AP* * AGU_OS* * AGU_MOD* Reviewed-by: Vineet Gupta Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta

ARC: add support for DSP-enabled userspace applications

2020-03-16T17:30:49+00:00

To be able to run DSP-enabled userspace applications we need to save and restore following DSP-related registers: At IRQ/exception entry/exit: * DSP_CTRL (save it and reset to value suitable for kernel) * ACC0_LO, ACC0_HI (we already save them as r58, r59 pair) At context switch: * ACC0_GLO, ACC0_GHI * DSP_BFLY0, DSP_FFT_CTRL Reviewed-by: Vineet Gupta Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta

ARC: handle DSP presence in HW

2020-03-16T17:23:44+00:00

When DSP extensions are present, some of the regular integer instructions such as DIV, MACD etc are executed in the DSP unit with semantics alterable by flags in DSP_CTRL aux register. This register is writable by userspace and thus can potentially affect corresponding instructions in kernel code, intentionally or otherwise. So safegaurd kernel by effectively disabling DSP_CTRL upon bootup and every entry to kernel. Do note that for this config we simply zero out the DSP_CTRL reg assuming userspace doesn't really care about DSP. The next patch caters to the DSP aware userspace where this reg is saved/restored upon kernel entry/exit. Reviewed-by: Vineet Gupta Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta

kernel/linux.git/arch/arc/include/asm/arcregs.h, branch linux-7.0.y

mm: replace (20 - PAGE_SHIFT) with common macros for pages<->MB conversion

ARC: Replace __ASSEMBLY__ with __ASSEMBLER__ in the non-uapi headers

arc: rename aux.h to arc_aux.h

ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA

ARC: boot log: eliminate struct cpuinfo_arc #3: don't export

ARC: boot log: eliminate struct cpuinfo_arc #2: cache

ARC: boot log: eliminate struct cpuinfo_arc #1: mm

ARC: allow userspace DSP applications to use AGU extensions

ARC: add support for DSP-enabled userspace applications

ARC: handle DSP presence in HW

ARC: Replace ASSEMBLY with ASSEMBLER in the non-uapi headers