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 */
  17 struct 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
  38 struct arc_fpu {
  39         unsigned int ctrl, status;
  40 };
  41
  42 extern void fpu_init_task(struct pt_regs *regs);
  43
  44 #endif  /* !CONFIG_ISA_ARCOMPACT */
  45
  46 extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
  47
  48 #else   /* !CONFIG_ARC_FPU_SAVE_RESTORE */
  49
  50 #define fpu_save_restore(p, n)
  51 #define fpu_init_task(regs)
  52
  53 #endif  /* CONFIG_ARC_FPU_SAVE_RESTORE */
  54
  55 #endif  /* _ASM_ARC_FPU_H */