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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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44e92e0364
Currently, the nds32 FPU dose not support the arithmetic of denormalized
number. When the nds32 FPU finds the result of the instruction is a
denormlized number, the nds32 FPU considers it to be an underflow condition
and rounds the result to an appropriate number. It may causes some loss
of precision. This commit proposes a solution to re-execute the
instruction by the FPU emulator to enhance the precision. To transfer
calculations from user space to kernel space, this feature will enable
the underflow exception trap by default. Enabling this feature may cause
some side effects:
1. Performance loss due to extra FPU exception
2. Need another scheme to control real underflow trap
A new parameter, UDF_trap, which is belong to FPU context is used
to control underflow trap.
User can configure this feature via CONFIG_SUPPORT_DENORMAL_ARITHMETIC
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
15 lines
494 B
C
15 lines
494 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef __ASM_NDS32_SYSCALLS_H
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#define __ASM_NDS32_SYSCALLS_H
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asmlinkage long sys_cacheflush(unsigned long addr, unsigned long len, unsigned int op);
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asmlinkage long sys_fadvise64_64_wrapper(int fd, int advice, loff_t offset, loff_t len);
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asmlinkage long sys_rt_sigreturn_wrapper(void);
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asmlinkage long sys_udftrap(int option);
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#include <asm-generic/syscalls.h>
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#endif /* __ASM_NDS32_SYSCALLS_H */
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