mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-29 21:33:00 +01:00
Samuel Holland
77acc6b55a
This is motivated by the amdgpu DRM driver, which needs floating-point code to support recent hardware. That code is not performance-critical, so only provide a minimal non-preemptible implementation for now. Support is limited to riscv64 because riscv32 requires runtime (libgcc) assistance to convert between doubles and 64-bit integers. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Samuel Holland <[email protected]> Acked-by: Palmer Dabbelt <[email protected]> Reviewed-by: Palmer Dabbelt <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Acked-by: Christian König <[email protected]> Cc: Alex Deucher <[email protected]> Cc: Borislav Petkov (AMD) <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Huacai Chen <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Masahiro Yamada <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Nathan Chancellor <[email protected]> Cc: Nicolas Schier <[email protected]> Cc: Russell King <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: WANG Xuerui <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
29 lines
560 B
C
29 lines
560 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2023 SiFive
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*/
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#include <linux/export.h>
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#include <linux/preempt.h>
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#include <asm/csr.h>
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#include <asm/fpu.h>
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#include <asm/processor.h>
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#include <asm/switch_to.h>
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void kernel_fpu_begin(void)
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{
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preempt_disable();
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fstate_save(current, task_pt_regs(current));
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csr_set(CSR_SSTATUS, SR_FS);
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}
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EXPORT_SYMBOL_GPL(kernel_fpu_begin);
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void kernel_fpu_end(void)
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{
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csr_clear(CSR_SSTATUS, SR_FS);
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fstate_restore(current, task_pt_regs(current));
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preempt_enable();
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}
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EXPORT_SYMBOL_GPL(kernel_fpu_end);
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