* add p cc
[mascara-docs.git] / i386 / linux / linux-0.99 / drivers / FPU-emu / fpu_emu.h
blob7b1a7e8ad15739f3f3acfc3de3f7b8a2dbddee2a
1 /*---------------------------------------------------------------------------+
2 | fpu_emu.h |
3 | |
4 | Copyright (C) 1992,1993,1994 |
5 | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
6 | Australia. E-mail billm@vaxc.cc.monash.edu.au |
7 | |
8 +---------------------------------------------------------------------------*/
11 #ifndef _FPU_EMU_H_
12 #define _FPU_EMU_H_
15 * Define DENORM_OPERAND to make the emulator detect denormals
16 * and use the denormal flag of the status word. Note: this only
17 * affects the flag and corresponding interrupt, the emulator
18 * will always generate denormals and operate upon them as required.
20 #define DENORM_OPERAND
23 * Define PECULIAR_486 to get a closer approximation to 80486 behaviour,
24 * rather than behaviour which appears to be cleaner.
25 * This is a matter of opinion: for all I know, the 80486 may simply
26 * be complying with the IEEE spec. Maybe one day I'll get to see the
27 * spec...
29 #define PECULIAR_486
31 #ifdef __ASSEMBLER__
32 #include "fpu_asm.h"
33 #define Const(x) $##x
34 #else
35 #define Const(x) x
36 #endif
38 #define EXP_BIAS Const(0)
39 #define EXP_OVER Const(0x4000) /* smallest invalid large exponent */
40 #define EXP_UNDER Const(-0x3fff) /* largest invalid small exponent */
41 #define EXP_Infinity EXP_OVER
42 #define EXP_NaN EXP_OVER
44 #define SIGN_POS Const(0)
45 #define SIGN_NEG Const(1)
47 /* Keep the order TW_Valid, TW_Zero, TW_Denormal */
48 #define TW_Valid Const(0) /* valid */
49 #define TW_Zero Const(1) /* zero */
50 /* The following fold to 2 (Special) in the Tag Word */
51 /* #define TW_Denormal Const(4) */ /* De-normal */
52 #define TW_Infinity Const(5) /* + or - infinity */
53 #define TW_NaN Const(6) /* Not a Number */
55 #define TW_Empty Const(7) /* empty */
58 #ifndef __ASSEMBLER__
60 #include <linux/math_emu.h>
61 #include <linux/linkage.h>
63 #ifdef PARANOID
64 extern char emulating;
65 # define RE_ENTRANT_CHECK_OFF emulating = 0
66 # define RE_ENTRANT_CHECK_ON emulating = 1
67 #else
68 # define RE_ENTRANT_CHECK_OFF
69 # define RE_ENTRANT_CHECK_ON
70 #endif PARANOID
72 #define FWAIT_OPCODE 0x9b
73 #define OP_SIZE_PREFIX 0x66
74 #define ADDR_SIZE_PREFIX 0x67
75 #define PREFIX_CS 0x2e
76 #define PREFIX_DS 0x3e
77 #define PREFIX_ES 0x26
78 #define PREFIX_SS 0x36
79 #define PREFIX_FS 0x64
80 #define PREFIX_GS 0x65
81 #define PREFIX_REPE 0xf3
82 #define PREFIX_REPNE 0xf2
83 #define PREFIX_LOCK 0xf0
85 /* These are to defeat the default action, giving the instruction
86 no net effect: */
87 #define NO_NET_DATA_EFFECT \
88 { FPU_data_address = (void *)data_operand_offset; \
89 FPU_data_selector = operand_selector; }
90 #define NO_NET_INSTR_EFFECT \
91 { FPU_entry_eip = ip_offset; \
92 FPU_entry_op_cs = cs_selector; }
95 typedef void (*FUNC)(void);
96 typedef struct fpu_reg FPU_REG;
97 typedef struct { unsigned char address_size, segment; } overrides;
99 #define st(x) ( regs[((top+x) &7 )] )
101 #define STACK_OVERFLOW (st_new_ptr = &st(-1), st_new_ptr->tag != TW_Empty)
102 #define NOT_EMPTY(i) (st(i).tag != TW_Empty)
103 #define NOT_EMPTY_0 (FPU_st0_tag ^ TW_Empty)
105 extern unsigned char FPU_rm;
107 extern char FPU_st0_tag;
108 extern FPU_REG *FPU_st0_ptr;
110 /* ###### These need to be shifted to somewhere safe. */
111 /* extern void *FPU_data_address; has been shifted */
112 extern unsigned short FPU_data_selector;
113 extern unsigned long FPU_entry_op_cs;
115 extern FPU_REG FPU_loaded_data;
117 #define pop() { FPU_st0_ptr->tag = TW_Empty; top++; }
119 /* push() does not affect the tags */
120 #define push() { top--; FPU_st0_ptr = st_new_ptr; }
123 #define reg_move(x, y) { \
124 *(short *)&((y)->sign) = *(short *)&((x)->sign); \
125 *(long *)&((y)->exp) = *(long *)&((x)->exp); \
126 *(long long *)&((y)->sigl) = *(long long *)&((x)->sigl); }
128 #define significand(x) ( ((unsigned long long *)&((x)->sigl))[0] )
131 /*----- Prototypes for functions written in assembler -----*/
132 /* extern void reg_move(FPU_REG *a, FPU_REG *b); */
134 asmlinkage void mul64(unsigned long long const *a, unsigned long long const *b,
135 unsigned long long *result);
136 asmlinkage void poly_div2(unsigned long long *x);
137 asmlinkage void poly_div4(unsigned long long *x);
138 asmlinkage void poly_div16(unsigned long long *x);
139 asmlinkage void polynomial(unsigned accum[], unsigned const x[],
140 unsigned short const terms[][4], int const n);
141 asmlinkage void normalize(FPU_REG *x);
142 asmlinkage void normalize_nuo(FPU_REG *x);
143 asmlinkage int reg_div(FPU_REG const *arg1, FPU_REG const *arg2,
144 FPU_REG *answ, unsigned int control_w);
145 asmlinkage int reg_u_sub(FPU_REG const *arg1, FPU_REG const *arg2,
146 FPU_REG *answ, unsigned int control_w);
147 asmlinkage int reg_u_mul(FPU_REG const *arg1, FPU_REG const *arg2,
148 FPU_REG *answ, unsigned int control_w);
149 asmlinkage int reg_u_div(FPU_REG const *arg1, FPU_REG const *arg2,
150 FPU_REG *answ, unsigned int control_w);
151 asmlinkage int reg_u_add(FPU_REG const *arg1, FPU_REG const *arg2,
152 FPU_REG *answ, unsigned int control_w);
153 asmlinkage int wm_sqrt(FPU_REG *n, unsigned int control_w);
154 asmlinkage unsigned shrx(void *l, unsigned x);
155 asmlinkage unsigned shrxs(void *v, unsigned x);
156 asmlinkage unsigned long div_small(unsigned long long *x, unsigned long y);
157 asmlinkage void round_reg(FPU_REG *arg, unsigned int extent,
158 unsigned int control_w);
160 #ifndef MAKING_PROTO
161 #include "fpu_proto.h"
162 #endif
164 #endif __ASSEMBLER__
166 #endif _FPU_EMU_H_