函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\fpu\xstate.c Create Date:2022-07-27 08:50:46
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：xfeature_size

函数原型：static int xfeature_size(int xfeature_nr)

返回类型：int

参数：

类型参数名称
intxfeature_nr
459  This check is important because it is easy to get XSTATE_** confused with XSTATE_BIT_*.(xfeature_nr)
460  cpuid_count(XSTATE_CPUID, xfeature_nr, & eax, & ebx, & ecx, & edx)
461  返回:eax
调用者
名称描述
check_xstate_against_structWe have a C struct for each 'xstate'. We need to ensure* that our software representation matches what the CPU* tells us about the state's size.
do_extra_xstate_size_checksThis essentially double-checks what the cpu told us about* how large the XSAVE buffer needs to be. We are recalculating* it to be safe.