Annotation of sys/arch/i386/include/npx.h, Revision 1.1.1.1
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_ */
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