Annotation of sys/arch/i386/include/npx.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: npx.h,v 1.10 2006/10/01 18:07:56 kettenis Exp $ */
! 2: /* $NetBSD: npx.h,v 1.11 1994/10/27 04:16:11 cgd Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1990 The Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to Berkeley by
! 9: * William Jolitz.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * @(#)npx.h 5.3 (Berkeley) 1/18/91
! 36: */
! 37:
! 38: /*
! 39: * 287/387 NPX Coprocessor Data Structures and Constants
! 40: * W. Jolitz 1/90
! 41: */
! 42:
! 43: #ifndef _I386_NPX_H_
! 44: #define _I386_NPX_H_
! 45:
! 46: /* Environment information of floating point unit */
! 47: struct env87 {
! 48: long en_cw; /* control word (16bits) */
! 49: long en_sw; /* status word (16bits) */
! 50: long en_tw; /* tag word (16bits) */
! 51: long en_fip; /* floating point instruction pointer */
! 52: u_short en_fcs; /* floating code segment selector */
! 53: u_short en_opcode; /* opcode last executed (11 bits ) */
! 54: long en_foo; /* floating operand offset */
! 55: long en_fos; /* floating operand segment selector */
! 56: };
! 57:
! 58: #define EN_SW_IE 0x0001 /* invalid operation */
! 59: #define EN_SW_DE 0x0002 /* denormal */
! 60: #define EN_SW_ZE 0x0004 /* divide by zero */
! 61: #define EN_SW_OE 0x0008 /* overflow */
! 62: #define EN_SW_UE 0x0010 /* underflow */
! 63: #define EN_SW_PE 0x0020 /* loss of precision */
! 64:
! 65: /* Contents of each floating point accumulator */
! 66: struct fpacc87 {
! 67: #ifdef dontdef /* too unportable */
! 68: u_long fp_mantlo; /* mantissa low (31:0) */
! 69: u_long fp_manthi; /* mantissa high (63:32) */
! 70: int fp_exp:15; /* exponent */
! 71: int fp_sgn:1; /* mantissa sign */
! 72: #else
! 73: u_char fp_bytes[10];
! 74: #endif
! 75: };
! 76:
! 77: /* Floating point and emulator context */
! 78: struct save87 {
! 79: struct env87 sv_env; /* floating point control/status */
! 80: struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
! 81: u_long sv_ex_sw; /* status word for last exception */
! 82: u_long sv_ex_tw; /* tag word for last exception */
! 83: };
! 84:
! 85: /* Environment of FPU/MMX/SSE/SSE2. */
! 86: struct envxmm {
! 87: /*0*/ uint16_t en_cw; /* FPU Control Word */
! 88: uint16_t en_sw; /* FPU Status Word */
! 89: uint8_t en_tw; /* FPU Tag Word (abridged) */
! 90: uint8_t en_rsvd0;
! 91: uint16_t en_opcode; /* FPU Opcode */
! 92: uint32_t en_fip; /* FPU Instruction Pointer */
! 93: uint16_t en_fcs; /* FPU IP selector */
! 94: uint16_t en_rsvd1;
! 95: /*16*/ uint32_t en_foo; /* FPU Data pointer */
! 96: uint16_t en_fos; /* FPU Data pointer selector */
! 97: uint16_t en_rsvd2;
! 98: uint32_t en_mxcsr; /* MXCSR Register State */
! 99: uint32_t en_rsvd3;
! 100: };
! 101:
! 102: /* FPU regsters in the extended save format. */
! 103: struct fpaccxmm {
! 104: uint8_t fp_bytes[10];
! 105: uint8_t fp_rsvd[6];
! 106: };
! 107:
! 108: /* SSE/SSE2 registers. */
! 109: struct xmmreg {
! 110: uint8_t sse_bytes[16];
! 111: };
! 112:
! 113: /* FPU/MMX/SSE/SSE2 context */
! 114: struct savexmm {
! 115: struct envxmm sv_env; /* control/status context */
! 116: struct fpaccxmm sv_ac[8]; /* ST/MM regs */
! 117: struct xmmreg sv_xmmregs[8]; /* XMM regs */
! 118: uint8_t sv_rsvd[16 * 14];
! 119: /* 512-bytes --- end of hardware portion of save area */
! 120: uint32_t sv_ex_sw; /* saved SW from last exception */
! 121: uint32_t sv_ex_tw; /* saved TW from last exception */
! 122: };
! 123:
! 124: union savefpu {
! 125: struct save87 sv_87;
! 126: struct savexmm sv_xmm;
! 127: };
! 128:
! 129: /* Cyrix EMC memory - mapped coprocessor context switch information */
! 130: struct emcsts {
! 131: long em_msw; /* memory mapped status register when swtched */
! 132: long em_tar; /* memory mapped temp A register when swtched */
! 133: long em_dl; /* memory mapped D low register when swtched */
! 134: };
! 135:
! 136: /* Intel prefers long real (53 bit) precision */
! 137: #define __iBCS_NPXCW__ 0x262
! 138: #define __BDE_NPXCW__ 0x1272 /* FreeBSD */
! 139: #define __OpenBSD_NPXCW__ 0x37f
! 140:
! 141: /*
! 142: * The default MXCSR value at reset is 0x1f80, IA-32 Instruction
! 143: * Set Reference, pg. 3-369.
! 144: */
! 145: #define __INITIAL_MXCSR__ 0x1f80
! 146:
! 147: /*
! 148: * The standard control word from finit is 0x37F, giving:
! 149: * round to nearest
! 150: * 64-bit precision
! 151: * all exceptions masked.
! 152: *
! 153: * The iBCS control word has underflow, overflow, zero divide, and invalid
! 154: * operation exceptions unmasked. But that causes an unexpected exception
! 155: * in the test program 'paranoia' and makes denormals useless (DBL_MIN / 2
! 156: * underflows). It doesn't make a lot of sense to trap underflow without
! 157: * trapping denormals.
! 158: */
! 159:
! 160: #define __INITIAL_NPXCW__ __OpenBSD_NPXCW__
! 161:
! 162: void process_xmm_to_s87(const struct savexmm *, struct save87 *);
! 163: void process_s87_to_xmm(const struct save87 *, struct savexmm *);
! 164: struct cpu_info;
! 165:
! 166: void npxinit(struct cpu_info *);
! 167:
! 168: #endif /* !_I386_NPX_H_ */
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to npx.h CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / i386 / include