CR4_OSFXSR
cr4 |= CR4_OSFXSR;
lcr4(rcr4() | CR4_OSFXSR);
cr4 |= CR4_OSFXSR;
initctx->ctrlreg[4] = CR4_PAE | CR4_OSFXSR | CR4_OSXMMEXCPT;
initctx->ctrlreg[4] = /* CR4_PAE | */CR4_OSFXSR | CR4_OSXMMEXCPT;
CR4_OSFXSR | \
CR4_OSFXSR | \