1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef _ASM_ARC_FPU_H 8*4882a593Smuzhiyun #define _ASM_ARC_FPU_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #include <asm/ptrace.h> 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #ifdef CONFIG_ISA_ARCOMPACT 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* These DPFP regs need to be saved/restored across ctx-sw */ 17*4882a593Smuzhiyun struct arc_fpu { 18*4882a593Smuzhiyun struct { 19*4882a593Smuzhiyun unsigned int l, h; 20*4882a593Smuzhiyun } aux_dpfp[2]; 21*4882a593Smuzhiyun }; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun #define fpu_init_task(regs) 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun #else 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * ARCv2 FPU Control aux register 29*4882a593Smuzhiyun * - bits to enable Traps on Exceptions 30*4882a593Smuzhiyun * - Rounding mode 31*4882a593Smuzhiyun * 32*4882a593Smuzhiyun * ARCv2 FPU Status aux register 33*4882a593Smuzhiyun * - FPU exceptions flags (Inv, Div-by-Zero, overflow, underflow, inexact) 34*4882a593Smuzhiyun * - Flag Write Enable to clear flags explicitly (vs. by fpu instructions 35*4882a593Smuzhiyun * only 36*4882a593Smuzhiyun */ 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun struct arc_fpu { 39*4882a593Smuzhiyun unsigned int ctrl, status; 40*4882a593Smuzhiyun }; 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun extern void fpu_init_task(struct pt_regs *regs); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #endif /* !CONFIG_ISA_ARCOMPACT */ 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun struct task_struct; 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun extern void fpu_save_restore(struct task_struct *p, struct task_struct *n); 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun #else /* !CONFIG_ARC_FPU_SAVE_RESTORE */ 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun #define fpu_save_restore(p, n) 53*4882a593Smuzhiyun #define fpu_init_task(regs) 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun #endif /* CONFIG_ARC_FPU_SAVE_RESTORE */ 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun #endif /* _ASM_ARC_FPU_H */ 58