fpu_area_restore
void fpu_area_restore(const void *, uint64_t, bool);
fpu_area_restore(pcb->pcb_savefpu, x86_xsave_features,
fpu_area_restore(safe_fpu, x86_xsave_features, /*is_64bit*/false);
fpu_area_restore(zero_fpu, x86_xsave_features, /*is_64bit*/false);
fpu_area_restore(&cpudata->gfpu, XCR0_X87|XCR0_SSE, false);
fpu_area_restore(&cpudata->gfpu, cpudata->xcr0_mask, false);
fpu_area_restore(&cpudata->gfpu, XCR0_X87|XCR0_SSE, false);
fpu_area_restore(&cpudata->gfpu, cpudata->xcr0_mask, true);