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sortix--sortix/kernel/x86-family/float.h

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Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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/*******************************************************************************
Implement signals. Note: This is an incompatible ABI change.
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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Update copyright headers of old files to the current format.
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This file is part of Sortix.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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Update copyright headers of old files to the current format.
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Sortix 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 3 of the License, or (at your option) any later
version.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
2012-08-04 18:06:17 -04:00
Update copyright headers of old files to the current format.
2013-07-10 09:26:01 -04:00
Sortix 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.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
2012-08-04 18:06:17 -04:00
Update copyright headers of old files to the current format.
2013-07-10 09:26:01 -04:00
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
2012-08-04 18:06:17 -04:00
Update copyright headers of old files to the current format.
2013-07-10 09:26:01 -04:00
x86-family/float.h
Handles saving and restoration of floating point numbers.
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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*******************************************************************************/
#ifndef SORTIX_FLOAT_H
#define SORTIX_FLOAT_H
namespace Sortix {
Fix floating point corruption on thread exit.
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class Thread;
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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namespace Float {
Implement signals. Note: This is an incompatible ABI change.
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extern bool fpu_is_enabled;
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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void Init();
Fix floating point corruption on thread exit.
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void NofityTaskExit(Thread* thread);
Implement signals. Note: This is an incompatible ABI change.
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void Yield();
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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static inline void EnableFPU()
{
asm volatile ("clts");
Implement signals. Note: This is an incompatible ABI change.
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fpu_is_enabled = true;
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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}
static inline void DisableFPU()
{
Implement signals. Note: This is an incompatible ABI change.
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fpu_is_enabled = false;
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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unsigned long cr0;
asm volatile ("mov %%cr0, %0" : "=r"(cr0));
cr0 |= 1UL<<3UL;
asm volatile ("mov %0, %%cr0" : : "r"(cr0));
}
static inline void NotityTaskSwitch()
{
DisableFPU();
}
} // namespace Float
Fix floating point corruption on thread exit.
2013-01-14 08:38:21 -05:00
Added support for saving FPU registers upon context switch. This code uses the cr0 task switched bit to disable the FPU upon task switch, which allows the kernel to delay copying the registers until another task starts using them. Or better yet, if no other thread actually uses the registers, then it won't need to do any copying at all!
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} // namespace Sortix
#endif
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