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 08:50:44
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：This function sets up offsets and sizes of all extended states in* xsave area. This supports both standard format and compacted format* of the xsave aread.

函数原型：static void __init setup_xstate_comp(void)

返回类型：void

参数：无

356  xstate_comp_offsets[XFEATURE_FP]等于0
357  xstate_comp_offsets[XFEATURE_SSE]等于offsetof(structfxregs_state, xmm_space)
360  如果非boot_cpu_has(XSAVES/XRSTORS instructions )则
361  以i小于XFEATURE_MAX循环
362  如果Note that in the future we will likely need a pair of* functions here: one for user xstates and the other for* system xstates. For now, they are the same.则
367  返回
370  xstate_comp_offsets[FIRST_EXTENDED_XFEATURE]等于FXSAVE_SIZE加XSAVE_HDR_SIZE
373  以i小于XFEATURE_MAX循环
374  如果Note that in the future we will likely need a pair of* functions here: one for user xstates and the other for* system xstates. For now, they are the same.则xstate_comp_sizes[i]等于xstate_sizes[i]
376  否则xstate_comp_sizes[i]等于0
379  如果i大于FIRST_EXTENDED_XFEATURE则
380  xstate_comp_offsets[i]等于xstate_comp_offsets[i - 1]加xstate_comp_sizes[i - 1]
383  如果We could cache this like xstate_size[], but we only use* it here, so it would be a waste of space.则xstate_comp_offsets[i]等于@a is a power of 2 value (xstate_comp_offsets[i], 64)
调用者
名称描述
fpu__init_system_xstateEnable and initialize the xsave feature.* Called once per system bootup.