5c6eb03790
functions, they are unused. Remove 'user' from npxgetuserregs()
etc. names.
For {npx,fpu}{get,set}regs(), always use pcb->pcb_user_save for FPU
context storage. This eliminates the need for ugly copying with
overwrite of the newly added and reserved fields in ucontext on i386
to satisfy alignment requirements for fpusave() and fpurstor().
pc98 version was copied from i386.
Suggested and reviewed by: bde
Tested by: pho (i386 and amd64)
MFC after: 1 week
174 lines
5.6 KiB
C
174 lines
5.6 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
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* $FreeBSD$
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*/
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/*
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* 287/387 NPX Coprocessor Data Structures and Constants
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* W. Jolitz 1/90
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*/
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#ifndef _MACHINE_NPX_H_
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#define _MACHINE_NPX_H_
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/* Environment information of floating point unit */
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struct env87 {
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long en_cw; /* control word (16bits) */
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long en_sw; /* status word (16bits) */
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long en_tw; /* tag word (16bits) */
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long en_fip; /* floating point instruction pointer */
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u_short en_fcs; /* floating code segment selector */
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u_short en_opcode; /* opcode last executed (11 bits ) */
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long en_foo; /* floating operand offset */
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long en_fos; /* floating operand segment selector */
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};
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/* Contents of each floating point accumulator */
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struct fpacc87 {
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#ifdef dontdef /* too unportable */
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u_long fp_mantlo; /* mantissa low (31:0) */
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u_long fp_manthi; /* mantissa high (63:32) */
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int fp_exp:15; /* exponent */
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int fp_sgn:1; /* mantissa sign */
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#else
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u_char fp_bytes[10];
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#endif
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};
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/* Floating point context */
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struct save87 {
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struct env87 sv_env; /* floating point control/status */
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struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
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u_char sv_pad0[4]; /* padding for (now unused) saved status word */
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/*
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* Bogus padding for emulators. Emulators should use their own
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* struct and arrange to store into this struct (ending here)
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* before it is inspected for ptracing or for core dumps. Some
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* emulators overwrite the whole struct. We have no good way of
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* knowing how much padding to leave. Leave just enough for the
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* GPL emulator's i387_union (176 bytes total).
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*/
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u_char sv_pad[64]; /* padding; used by emulators */
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};
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struct envxmm {
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u_int16_t en_cw; /* control word (16bits) */
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u_int16_t en_sw; /* status word (16bits) */
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u_int16_t en_tw; /* tag word (16bits) */
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u_int16_t en_opcode; /* opcode last executed (11 bits ) */
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u_int32_t en_fip; /* floating point instruction pointer */
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u_int16_t en_fcs; /* floating code segment selector */
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u_int16_t en_pad0; /* padding */
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u_int32_t en_foo; /* floating operand offset */
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u_int16_t en_fos; /* floating operand segment selector */
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u_int16_t en_pad1; /* padding */
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u_int32_t en_mxcsr; /* SSE control/status register */
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u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
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};
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/* Contents of each SSE extended accumulator */
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struct xmmacc {
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u_char xmm_bytes[16];
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};
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struct savexmm {
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struct envxmm sv_env;
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struct {
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struct fpacc87 fp_acc;
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u_char fp_pad[6]; /* padding */
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} sv_fp[8];
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struct xmmacc sv_xmm[8];
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u_char sv_pad[224];
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} __aligned(16);
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union savefpu {
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struct save87 sv_87;
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struct savexmm sv_xmm;
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};
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/*
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* The hardware default control word for i387's and later coprocessors is
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* 0x37F, giving:
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*
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* round to nearest
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* 64-bit precision
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* all exceptions masked.
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*
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* We modify the affine mode bit and precision bits in this to give:
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*
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* affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
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* 53-bit precision (2 in bitfield 3<<8)
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*
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* 64-bit precision often gives bad results with high level languages
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* because it makes the results of calculations depend on whether
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* intermediate values are stored in memory or in FPU registers.
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*/
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#define __INITIAL_NPXCW__ 0x127F
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#define __INITIAL_MXCSR__ 0x1F80
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#ifdef _KERNEL
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struct fpu_kern_ctx {
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union savefpu hwstate;
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union savefpu *prev;
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uint32_t flags;
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};
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#define FPU_KERN_CTX_NPXINITDONE 0x01
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#define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNNPX) == 0)
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int npxdna(void);
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void npxdrop(void);
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void npxexit(struct thread *td);
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int npxformat(void);
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int npxgetregs(struct thread *td);
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void npxinit(void);
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void npxsave(union savefpu *addr);
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void npxsetregs(struct thread *td, union savefpu *addr);
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int npxtrap(void);
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void npxuserinited(struct thread *);
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int fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx,
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u_int flags);
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int fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx);
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int fpu_kern_thread(u_int flags);
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int is_fpu_kern_thread(u_int flags);
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/*
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* Flags for fpu_kern_enter() and fpu_kern_thread().
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*/
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#define FPU_KERN_NORMAL 0x0000
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#endif
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#endif /* !_MACHINE_NPX_H_ */
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