LXR linux/arch/arc/include/asm/fpu.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com)
   4 *
   5 */
   6
   7#ifndef _ASM_ARC_FPU_H
   8#define _ASM_ARC_FPU_H
   9
  10#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
  11
  12#include <asm/ptrace.h>
  13
  14#ifdef CONFIG_ISA_ARCOMPACT
  15
  16/* These DPFP regs need to be saved/restored across ctx-sw */
  17struct arc_fpu {
  18        struct {
  19                unsigned int l, h;
  20        } aux_dpfp[2];
  21};
  22
  23#define fpu_init_task(regs)
  24
  25#else
  26
  27/*
  28 * ARCv2 FPU Control aux register
  29 *   - bits to enable Traps on Exceptions
  30 *   - Rounding mode
  31 *
  32 * ARCv2 FPU Status aux register
  33 *   - FPU exceptions flags (Inv, Div-by-Zero, overflow, underflow, inexact)
  34 *   - Flag Write Enable to clear flags explicitly (vs. by fpu instructions
  35 *     only
  36 */
  37
  38struct arc_fpu {
  39        unsigned int ctrl, status;
  40};
  41
  42extern void fpu_init_task(struct pt_regs *regs);
  43
  44#endif  /* !CONFIG_ISA_ARCOMPACT */
  45
  46struct task_struct;
  47
  48extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
  49
  50#else   /* !CONFIG_ARC_FPU_SAVE_RESTORE */
  51
  52#define fpu_save_restore(p, n)
  53#define fpu_init_task(regs)
  54
  55#endif  /* CONFIG_ARC_FPU_SAVE_RESTORE */
  56
  57#endif  /* _ASM_ARC_FPU_H */
  58