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1da177e4 LT |
1 | /* |
2 | NetWinder Floating Point Emulator | |
3 | (c) Rebel.com, 1998-1999 | |
4 | ||
5 | Direct questions, comments to Scott Bambrough <scottb@netwinder.org> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | #ifndef __FPA11_H__ | |
23 | #define __FPA11_H__ | |
24 | ||
25 | #define GET_FPA11() ((FPA11 *)(¤t_thread_info()->fpstate)) | |
26 | ||
27 | /* | |
28 | * The processes registers are always at the very top of the 8K | |
29 | * stack+task struct. Use the same method as 'current' uses to | |
30 | * reach them. | |
31 | */ | |
b66da4a4 | 32 | #define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1) |
1da177e4 LT |
33 | |
34 | #include <linux/config.h> | |
35 | #include <linux/thread_info.h> | |
36 | ||
37 | /* includes */ | |
38 | #include "fpsr.h" /* FP control and status register definitions */ | |
39 | #include "milieu.h" | |
f148af25 RP |
40 | |
41 | struct roundingData { | |
42 | int8 mode; | |
43 | int8 precision; | |
44 | signed char exception; | |
45 | }; | |
46 | ||
1da177e4 LT |
47 | #include "softfloat.h" |
48 | ||
49 | #define typeNone 0x00 | |
50 | #define typeSingle 0x01 | |
51 | #define typeDouble 0x02 | |
52 | #define typeExtended 0x03 | |
53 | ||
54 | /* | |
55 | * This must be no more and no less than 12 bytes. | |
56 | */ | |
57 | typedef union tagFPREG { | |
58 | float32 fSingle; | |
59 | float64 fDouble; | |
60 | #ifdef CONFIG_FPE_NWFPE_XP | |
61 | floatx80 fExtended; | |
62 | #else | |
63 | int padding[3]; | |
64 | #endif | |
65 | } FPREG; | |
66 | ||
67 | /* | |
68 | * FPA11 device model. | |
69 | * | |
70 | * This structure is exported to user space. Do not re-order. | |
71 | * Only add new stuff to the end, and do not change the size of | |
72 | * any element. Elements of this structure are used by user | |
73 | * space, and must match struct user_fp in include/asm-arm/user.h. | |
74 | * We include the byte offsets below for documentation purposes. | |
75 | * | |
76 | * The size of this structure and FPREG are checked by fpmodule.c | |
77 | * on initialisation. If the rules have been broken, NWFPE will | |
78 | * not initialise. | |
79 | */ | |
80 | typedef struct tagFPA11 { | |
81 | /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */ | |
82 | /* 96 */ FPSR fpsr; /* floating point status register */ | |
83 | /* 100 */ FPCR fpcr; /* floating point control register */ | |
84 | /* 104 */ unsigned char fType[8]; /* type of floating point value held in | |
85 | floating point registers. One of | |
86 | none, single, double or extended. */ | |
87 | /* 112 */ int initflag; /* this is special. The kernel guarantees | |
88 | to set it to 0 when a thread is launched, | |
89 | so we can use it to detect whether this | |
90 | instance of the emulator needs to be | |
91 | initialised. */ | |
92 | } FPA11; | |
93 | ||
f148af25 RP |
94 | extern int8 SetRoundingMode(const unsigned int); |
95 | extern int8 SetRoundingPrecision(const unsigned int); | |
1da177e4 LT |
96 | extern void nwfpe_init_fpa(union fp_state *fp); |
97 | ||
6ec5e7f3 BD |
98 | extern unsigned int EmulateAll(unsigned int opcode); |
99 | ||
100 | extern unsigned int EmulateCPDT(const unsigned int opcode); | |
101 | extern unsigned int EmulateCPDO(const unsigned int opcode); | |
102 | extern unsigned int EmulateCPRT(const unsigned int opcode); | |
103 | ||
104 | /* fpa11_cpdt.c */ | |
105 | extern unsigned int PerformLDF(const unsigned int opcode); | |
106 | extern unsigned int PerformSTF(const unsigned int opcode); | |
107 | extern unsigned int PerformLFM(const unsigned int opcode); | |
108 | extern unsigned int PerformSFM(const unsigned int opcode); | |
109 | ||
110 | /* single_cpdo.c */ | |
111 | ||
112 | extern unsigned int SingleCPDO(struct roundingData *roundData, | |
113 | const unsigned int opcode, FPREG * rFd); | |
114 | /* double_cpdo.c */ | |
115 | extern unsigned int DoubleCPDO(struct roundingData *roundData, | |
116 | const unsigned int opcode, FPREG * rFd); | |
117 | ||
1da177e4 | 118 | #endif |