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63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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x86-family/float.h
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Handles saving and restoration of floating point numbers.
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*******************************************************************************/
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#ifndef SORTIX_FLOAT_H
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#define SORTIX_FLOAT_H
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namespace Sortix {
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class Thread;
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namespace Float {
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extern bool fpu_is_enabled;
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void Init();
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void NofityTaskExit(Thread* thread);
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void Yield();
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static inline void EnableFPU()
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{
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asm volatile ("clts");
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fpu_is_enabled = true;
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}
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static inline void DisableFPU()
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{
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fpu_is_enabled = false;
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unsigned long cr0;
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asm volatile ("mov %%cr0, %0" : "=r"(cr0));
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cr0 |= 1UL<<3UL;
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asm volatile ("mov %0, %%cr0" : : "r"(cr0));
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}
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static inline void NotityTaskSwitch()
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{
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DisableFPU();
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}
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} // namespace Float
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} // namespace Sortix
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#endif
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