/*      $NetBSD: fpu.h,v 1.26 2026/06/13 19:45:50 rkujawa Exp $ */

/*-
 * Copyright (C) 1996 Wolfgang Solfrank.
 * Copyright (C) 1996 TooLs GmbH.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _POWERPC_FPU_H_
#define _POWERPC_FPU_H_

#define FPSCR_FX        0x80000000      /* Exception Summary */
#define FPSCR_FEX       0x40000000      /* Enabled Exception Summary */
#define FPSCR_VX        0x20000000      /* Invalid Operation Exception Summary */
#define FPSCR_OX        0x10000000      /* Overflow Exception */
#define FPSCR_UX        0x08000000      /* Undrflow Exception */
#define FPSCR_ZX        0x04000000      /* Zero Divide Exception */
#define FPSCR_XX        0x02000000      /* Inexact Exception */
#define FPSCR_VXSNAN    0x01000000      /* Invalid Op (NAN) */
#define FPSCR_VXISI     0x00800000      /* Invalid Op (INF-INF) */
#define FPSCR_VXIDI     0x00400000      /* Invalid Op (INF/INF) */
#define FPSCR_VXZDZ     0x00200000      /* Invalid Op (0/0) */
#define FPSCR_VXIMZ     0x00100000      /* Invalid Op (INFx0) */
#define FPSCR_VXVC      0x00080000      /* Invalid Compare Op */
#define FPSCR_FR        0x00040000      /* Fraction Rounded */
#define FPSCR_FI        0x00020000      /* Fraction Inexact */
#define FPSCR_FPRF      0x0001f000
#define FPSCR_C         0x00010000      /* FP Class Descriptor */
#define FPSCR_FPCC      0x0000f000
#define FPSCR_FL        0x00008000      /* < */
#define FPSCR_FG        0x00004000      /* > */
#define FPSCR_FE        0x00002000      /* == */
#define FPSCR_FU        0x00001000      /* unordered */
#define FPSCR_VXSOFT    0x00000400      /* Software Invalid Exception */
#define FPSCR_VXSQRT    0x00000200      /* Invalid Sqrt Exception */
#define FPSCR_VXCVI     0x00000100      /* Invalid Op Integer Cvt Exception */
#define FPSCR_VE        0x00000080      /* Invalid Op Exception Enable */
#define FPSCR_OE        0x00000040      /* Overflow Exception Enable */
#define FPSCR_UE        0x00000020      /* Underflow Exception Enable */
#define FPSCR_ZE        0x00000010      /* Zero Divide Exception Enable */
#define FPSCR_XE        0x00000008      /* Inexact Exception Enable */
#define FPSCR_NI        0x00000004      /* Non-IEEE Mode Enable */
#define FPSCR_RN        0x00000003

#ifdef _KERNEL

#ifdef _KERNEL_OPT
#include "opt_ppcarch.h"
#endif

#include <sys/pcu.h>
#include <powerpc/mcontext.h>

struct lwp;
bool    fpu_used_p(struct lwp *);
void    fpu_mark_used(struct lwp *);

void    fpu_restore_from_mcontext(struct lwp *, const mcontext_t *);
bool    fpu_save_to_mcontext(struct lwp *, mcontext_t *, unsigned int *);

int     fpu_get_fault_code(void);

extern const pcu_ops_t fpu_ops;

/*
 * List of PowerPC architectures that support FPUs.
 * PPC_IBM440 covers only the 440 with the FPU.
 */
#if defined(PPC_OEA) || defined (PPC_OEA64) || defined (PPC_OEA64_BRIDGE) || \
    defined(PPC_IBM440)
#define PPC_HAVE_FPU

struct fpreg;

static __inline void
fpu_load(void)
{
        pcu_load(&fpu_ops);
}

static __inline void
fpu_save(lwp_t *l)
{
        pcu_save(&fpu_ops, l);
}

static __inline void
fpu_discard(lwp_t *l)
{
        pcu_discard(&fpu_ops, l, false);
}

void    fpu_load_from_fpreg(const struct fpreg *);
void    fpu_unload_to_fpreg(struct fpreg *);

#endif /* PPC_HAVE_FPU */
#endif /* _KERNEL */

#endif  /* _POWERPC_FPU_H_ */