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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 | */ | |
32 | register unsigned long *user_registers asm("sl"); | |
33 | ||
34 | #define GET_USERREG() (user_registers) | |
35 | ||
36 | #include <linux/config.h> | |
37 | #include <linux/thread_info.h> | |
38 | ||
39 | /* includes */ | |
40 | #include "fpsr.h" /* FP control and status register definitions */ | |
41 | #include "milieu.h" | |
42 | #include "softfloat.h" | |
43 | ||
44 | #define typeNone 0x00 | |
45 | #define typeSingle 0x01 | |
46 | #define typeDouble 0x02 | |
47 | #define typeExtended 0x03 | |
48 | ||
49 | /* | |
50 | * This must be no more and no less than 12 bytes. | |
51 | */ | |
52 | typedef union tagFPREG { | |
53 | float32 fSingle; | |
54 | float64 fDouble; | |
55 | #ifdef CONFIG_FPE_NWFPE_XP | |
56 | floatx80 fExtended; | |
57 | #else | |
58 | int padding[3]; | |
59 | #endif | |
60 | } FPREG; | |
61 | ||
62 | /* | |
63 | * FPA11 device model. | |
64 | * | |
65 | * This structure is exported to user space. Do not re-order. | |
66 | * Only add new stuff to the end, and do not change the size of | |
67 | * any element. Elements of this structure are used by user | |
68 | * space, and must match struct user_fp in include/asm-arm/user.h. | |
69 | * We include the byte offsets below for documentation purposes. | |
70 | * | |
71 | * The size of this structure and FPREG are checked by fpmodule.c | |
72 | * on initialisation. If the rules have been broken, NWFPE will | |
73 | * not initialise. | |
74 | */ | |
75 | typedef struct tagFPA11 { | |
76 | /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */ | |
77 | /* 96 */ FPSR fpsr; /* floating point status register */ | |
78 | /* 100 */ FPCR fpcr; /* floating point control register */ | |
79 | /* 104 */ unsigned char fType[8]; /* type of floating point value held in | |
80 | floating point registers. One of | |
81 | none, single, double or extended. */ | |
82 | /* 112 */ int initflag; /* this is special. The kernel guarantees | |
83 | to set it to 0 when a thread is launched, | |
84 | so we can use it to detect whether this | |
85 | instance of the emulator needs to be | |
86 | initialised. */ | |
87 | } FPA11; | |
88 | ||
89 | extern void SetRoundingMode(const unsigned int); | |
90 | extern void SetRoundingPrecision(const unsigned int); | |
91 | extern void nwfpe_init_fpa(union fp_state *fp); | |
92 | ||
93 | #endif |