Messages in this thread | | | Date | Thu, 06 Sep 2018 02:45:04 -0700 (PDT) | Subject | Re: [PATCH v7 0/5] riscv: Add support to no-FPU systems | From | Palmer Dabbelt <> |
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On Sun, 26 Aug 2018 18:07:50 PDT (-0700), alankao@andestech.com wrote: > This patchset adds an option, CONFIG_FPU, to enable/disable floating- > point procedures. > > Kernel's new behavior will be as follows: > > * with CONFIG_FPU=y > All FPU codes are reserved. If no FPU is found during booting, a > global flag will be set, and those functions will be bypassed with > condition check to that flag. > > * with CONFIG_FPU=n > No floating-point instructions in kernel and all related settings > are excluded. > > Changes in v7: > - Remove "fd" attribute from KBUILD_CFLAGS. > > Changes in v6 (PATCH 0005 only): > - Make the flag checking neater. > > Changes in v5: > - Invert the polarity of checking flag from no_fpu to has_fpu. > > Changes in v4: > - Append a new patch to detect existence of FPU and followups. > - Add SPDX header to newly created fpu.S. > - Fix a build error, sorry for that. > - Fix wording, style, etc. > > Changes in v3: > - Refactor the whole patch into independent ones. > > Changes in v2: > - Various code cleanups and style fixes. > > > Alan Kao (5): > Extract FPU context operations from entry.S > Refactor FPU code in signal setup/return procedures > Cleanup ISA string setting > Allow to disable FPU support > Auto-detect whether a FPU exists > > arch/riscv/Kconfig | 9 +++ > arch/riscv/Makefile | 19 +++--- > arch/riscv/include/asm/switch_to.h | 12 +++- > arch/riscv/kernel/Makefile | 1 + > arch/riscv/kernel/cpufeature.c | 8 +++ > arch/riscv/kernel/entry.S | 87 ----------------------- > arch/riscv/kernel/fpu.S | 106 +++++++++++++++++++++++++++++ > arch/riscv/kernel/process.c | 6 +- > arch/riscv/kernel/signal.c | 75 ++++++++++++-------- > 9 files changed, 196 insertions(+), 127 deletions(-) > create mode 100644 arch/riscv/kernel/fpu.S
Thanks! I'll add this to our for-next branch.
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