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 */ 56