Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Russell King | b66da4a | 2005-07-17 10:54:50 +0100 | [diff] [blame] | 32 | #define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/thread_info.h> |
| 35 | |
| 36 | /* includes */ |
| 37 | #include "fpsr.h" /* FP control and status register definitions */ |
| 38 | #include "milieu.h" |
Richard Purdie | f148af2 | 2005-08-03 19:49:17 +0100 | [diff] [blame] | 39 | |
| 40 | struct roundingData { |
| 41 | int8 mode; |
| 42 | int8 precision; |
| 43 | signed char exception; |
| 44 | }; |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include "softfloat.h" |
| 47 | |
| 48 | #define typeNone 0x00 |
| 49 | #define typeSingle 0x01 |
| 50 | #define typeDouble 0x02 |
| 51 | #define typeExtended 0x03 |
| 52 | |
| 53 | /* |
| 54 | * This must be no more and no less than 12 bytes. |
| 55 | */ |
| 56 | typedef union tagFPREG { |
| 57 | float32 fSingle; |
| 58 | float64 fDouble; |
| 59 | #ifdef CONFIG_FPE_NWFPE_XP |
| 60 | floatx80 fExtended; |
| 61 | #else |
Lennert Buytenhek | bedf142 | 2005-11-07 21:12:08 +0000 | [diff] [blame] | 62 | u32 padding[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #endif |
Nicolas Pitre | 8993a44 | 2006-01-14 16:36:50 +0000 | [diff] [blame] | 64 | } __attribute__ ((packed,aligned(4))) FPREG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | /* |
| 67 | * FPA11 device model. |
| 68 | * |
| 69 | * This structure is exported to user space. Do not re-order. |
| 70 | * Only add new stuff to the end, and do not change the size of |
| 71 | * any element. Elements of this structure are used by user |
| 72 | * space, and must match struct user_fp in include/asm-arm/user.h. |
| 73 | * We include the byte offsets below for documentation purposes. |
| 74 | * |
| 75 | * The size of this structure and FPREG are checked by fpmodule.c |
| 76 | * on initialisation. If the rules have been broken, NWFPE will |
| 77 | * not initialise. |
| 78 | */ |
| 79 | typedef struct tagFPA11 { |
| 80 | /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */ |
| 81 | /* 96 */ FPSR fpsr; /* floating point status register */ |
| 82 | /* 100 */ FPCR fpcr; /* floating point control register */ |
| 83 | /* 104 */ unsigned char fType[8]; /* type of floating point value held in |
| 84 | floating point registers. One of |
| 85 | none, single, double or extended. */ |
| 86 | /* 112 */ int initflag; /* this is special. The kernel guarantees |
| 87 | to set it to 0 when a thread is launched, |
| 88 | so we can use it to detect whether this |
| 89 | instance of the emulator needs to be |
| 90 | initialised. */ |
Nicolas Pitre | 8993a44 | 2006-01-14 16:36:50 +0000 | [diff] [blame] | 91 | } __attribute__ ((packed,aligned(4))) FPA11; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Richard Purdie | f148af2 | 2005-08-03 19:49:17 +0100 | [diff] [blame] | 93 | extern int8 SetRoundingMode(const unsigned int); |
| 94 | extern int8 SetRoundingPrecision(const unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | extern void nwfpe_init_fpa(union fp_state *fp); |
| 96 | |
Ben Dooks | 6ec5e7f | 2005-10-12 19:58:10 +0100 | [diff] [blame] | 97 | extern unsigned int EmulateAll(unsigned int opcode); |
| 98 | |
| 99 | extern unsigned int EmulateCPDT(const unsigned int opcode); |
| 100 | extern unsigned int EmulateCPDO(const unsigned int opcode); |
| 101 | extern unsigned int EmulateCPRT(const unsigned int opcode); |
| 102 | |
| 103 | /* fpa11_cpdt.c */ |
| 104 | extern unsigned int PerformLDF(const unsigned int opcode); |
| 105 | extern unsigned int PerformSTF(const unsigned int opcode); |
| 106 | extern unsigned int PerformLFM(const unsigned int opcode); |
| 107 | extern unsigned int PerformSFM(const unsigned int opcode); |
| 108 | |
| 109 | /* single_cpdo.c */ |
| 110 | |
| 111 | extern unsigned int SingleCPDO(struct roundingData *roundData, |
| 112 | const unsigned int opcode, FPREG * rFd); |
| 113 | /* double_cpdo.c */ |
| 114 | extern unsigned int DoubleCPDO(struct roundingData *roundData, |
| 115 | const unsigned int opcode, FPREG * rFd); |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | #endif |