/* $NetBSD: npx.h,v 1.20 2003/08/07 16:27:59 agc Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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. * * @(#)npx.h 5.3 (Berkeley) 1/18/91 */ /* * 287/387 NPX Coprocessor Data Structures and Constants * W. Jolitz 1/90 */ #ifndef _I386_NPX_H_ #define _I386_NPX_H_ /* Environment information of floating point unit */ struct env87 { long en_cw; /* control word (16bits) */ long en_sw; /* status word (16bits) */ long en_tw; /* tag word (16bits) */ long en_fip; /* floating point instruction pointer */ u_short en_fcs; /* floating code segment selector */ u_short en_opcode; /* opcode last executed (11 bits ) */ long en_foo; /* floating operand offset */ long en_fos; /* floating operand segment selector */ }; /* Contents of each floating point accumulator */ struct fpacc87 { #ifdef dontdef /* too unportable */ u_long fp_mantlo; /* mantissa low (31:0) */ u_long fp_manthi; /* mantissa high (63:32) */ int fp_exp:15; /* exponent */ int fp_sgn:1; /* mantissa sign */ #else u_char fp_bytes[10]; #endif }; /* Floating point context */ struct save87 { struct env87 sv_env; /* floating point control/status */ struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ #ifndef dontdef u_long sv_ex_sw; /* status word for last exception (was pad) */ u_long sv_ex_tw; /* tag word for last exception (was pad) */ u_char sv_pad[8 * 2 - 2 * 4]; /* bogus historical padding */ #endif }; /* Environment of FPU/MMX/SSE/SSE2. */ struct envxmm { /*0*/ uint16_t en_cw; /* FPU Control Word */ uint16_t en_sw; /* FPU Status Word */ uint8_t en_rsvd0; uint8_t en_tw; /* FPU Tag Word (abridged) */ uint16_t en_opcode; /* FPU Opcode */ uint32_t en_fip; /* FPU Instruction Pointer */ uint16_t en_fcs; /* FPU IP selector */ uint16_t en_rsvd1; /*16*/ uint32_t en_foo; /* FPU Data pointer */ uint16_t en_fos; /* FPU Data pointer selector */ uint16_t en_rsvd2; uint32_t en_mxcsr; /* MXCSR Register State */ uint32_t en_rsvd3; }; /* FPU regsters in the extended save format. */ struct fpaccxmm { uint8_t fp_bytes[10]; uint8_t fp_rsvd[6]; }; /* SSE/SSE2 registers. */ struct xmmreg { uint8_t sse_bytes[16]; }; /* FPU/MMX/SSE/SSE2 context */ struct savexmm { struct envxmm sv_env; /* control/status context */ struct fpaccxmm sv_ac[8]; /* ST/MM regs */ struct xmmreg sv_xmmregs[8]; /* XMM regs */ uint8_t sv_rsvd[16 * 14]; /* 512-bytes --- end of hardware portion of save area */ uint32_t sv_ex_sw; /* saved SW from last exception */ uint32_t sv_ex_tw; /* saved TW from last exception */ }; union savefpu { struct save87 sv_87; struct savexmm sv_xmm; }; /* Cyrix EMC memory - mapped coprocessor context switch information */ struct emcsts { long em_msw; /* memory mapped status register when swtched */ long em_tar; /* memory mapped temp A register when swtched */ long em_dl; /* memory mapped D low register when swtched */ }; /* * The i387 defaults to Intel extended precision mode and round to nearest, * with all exceptions masked. */ #define __INITIAL_NPXCW__ 0x037f /* NetBSD uses IEEE double precision. */ #define __NetBSD_NPXCW__ 0x127f /* FreeBSD leaves some exceptions unmasked as well. */ #define __FreeBSD_NPXCW__ 0x1272 /* iBCS2 goes a bit further and leaves the underflow exception unmasked. */ #define __iBCS2_NPXCW__ 0x0262 /* Linux just uses the default control word. */ #define __Linux_NPXCW__ 0x037f /* SVR4 uses the same control word as iBCS2. */ #define __SVR4_NPXCW__ 0x0262 /* * The default MXCSR value at reset is 0x1f80, IA-32 Instruction * Set Reference, pg. 3-369. */ #define __INITIAL_MXCSR__ 0x1f80 /* * The standard control word from finit is 0x37F, giving: * round to nearest * 64-bit precision * all exceptions masked. * * Now we want: * affine mode (if we decide to support 287's) * round to nearest * 53-bit precision * all exceptions masked. * * 64-bit precision often gives bad results with high level languages * because it makes the results of calculations depend on whether * intermediate values are stored in memory or in FPU registers. * * The iBCS control word has underflow, overflow, zero divide, and invalid * operation exceptions unmasked. But that causes an unexpected exception * in the test program 'paranoia' and makes denormals useless (DBL_MIN / 2 * underflows). It doesn't make a lot of sense to trap underflow without * trapping denormals. */ #ifdef _KERNEL void probeintr(void); void probetrap(void); int npx586bug1(int, int); void npxinit(struct cpu_info *); void process_xmm_to_s87(const struct savexmm *, struct save87 *); void process_s87_to_xmm(const struct save87 *, struct savexmm *); #endif #endif /* !_I386_NPX_H_ */