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
134 lines
4.3 KiB
C
134 lines
4.3 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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* Floating Point Data Structures and Constants
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* W. Jolitz 1/90
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*/
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#ifndef _MACHINE_FPU_H_
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#define _MACHINE_FPU_H_
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/* Contents of each x87 floating point accumulator */
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struct fpacc87 {
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u_char fp_bytes[10];
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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 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_int8_t en_tw; /* tag word (8bits) */
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u_int8_t en_zero;
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u_int16_t en_opcode; /* opcode last executed (11 bits ) */
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u_int64_t en_rip; /* floating point instruction pointer */
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u_int64_t en_rdp; /* floating operand pointer */
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u_int32_t en_mxcsr; /* SSE sontorol/status register */
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u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
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};
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struct savefpu {
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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[16];
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u_char sv_pad[96];
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} __aligned(16);
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#ifdef _KERNEL
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struct fpu_kern_ctx {
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struct savefpu hwstate;
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struct savefpu *prev;
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uint32_t flags;
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};
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#define FPU_KERN_CTX_FPUINITDONE 0x01
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#define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNFPU) == 0)
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#endif
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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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* FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
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* because of the difference between memory and fpu register stack arguments.
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* If its using an intermediate fpu register, it has 80/64 bits to work
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* with. If it uses memory, it has 64/53 bits to work with. However,
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* gcc is aware of this and goes to a fair bit of trouble to make the
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* best use of it.
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*
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* This is mostly academic for AMD64, because the ABI prefers the use
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* SSE2 based math. For FreeBSD/amd64, we go with the default settings.
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*/
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#define __INITIAL_FPUCW__ 0x037F
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#define __INITIAL_FPUCW_I386__ 0x127F
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#define __INITIAL_MXCSR__ 0x1F80
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#define __INITIAL_MXCSR_MASK__ 0xFFBF
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#ifdef _KERNEL
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void fpudna(void);
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void fpudrop(void);
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void fpuexit(struct thread *td);
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int fpuformat(void);
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int fpugetregs(struct thread *td);
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void fpuinit(void);
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void fpusetregs(struct thread *td, struct savefpu *addr);
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int fputrap(void);
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void fpuuserinited(struct thread *td);
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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_FPU_H_ */
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