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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/nwfpe/fpmodule.inl | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/arm/nwfpe/fpmodule.inl')
-rw-r--r-- | arch/arm/nwfpe/fpmodule.inl | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpmodule.inl b/arch/arm/nwfpe/fpmodule.inl new file mode 100644 index 0000000..e5f59e9 --- /dev/null +++ b/arch/arm/nwfpe/fpmodule.inl @@ -0,0 +1,74 @@ +/* + NetWinder Floating Point Emulator + (c) Rebel.COM, 1998,1999 + + Direct questions, comments to Scott Bambrough <scottb@netwinder.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +static inline unsigned long readRegister(const unsigned int nReg) +{ + /* Note: The CPU thinks it has dealt with the current instruction. + As a result the program counter has been advanced to the next + instruction, and points 4 bytes beyond the actual instruction + that caused the invalid instruction trap to occur. We adjust + for this in this routine. LDF/STF instructions with Rn = PC + depend on the PC being correct, as they use PC+8 in their + address calculations. */ + unsigned long *userRegisters = GET_USERREG(); + unsigned int val = userRegisters[nReg]; + if (REG_PC == nReg) + val -= 4; + return val; +} + +static inline void +writeRegister(const unsigned int nReg, const unsigned long val) +{ + unsigned long *userRegisters = GET_USERREG(); + userRegisters[nReg] = val; +} + +static inline unsigned long readCPSR(void) +{ + return (readRegister(REG_CPSR)); +} + +static inline void writeCPSR(const unsigned long val) +{ + writeRegister(REG_CPSR, val); +} + +static inline unsigned long readConditionCodes(void) +{ +#ifdef __FPEM_TEST__ + return (0); +#else + return (readCPSR() & CC_MASK); +#endif +} + +static inline void writeConditionCodes(const unsigned long val) +{ + unsigned long *userRegisters = GET_USERREG(); + unsigned long rval; + /* + * Operate directly on userRegisters since + * the CPSR may be the PC register itself. + */ + rval = userRegisters[REG_CPSR] & ~CC_MASK; + userRegisters[REG_CPSR] = rval | (val & CC_MASK); +} |