CR4_PGE
if (cr4save & CR4_PGE)
lcr4(cr4save & ~CR4_PGE);
lcr4(cr4 & ~CR4_PGE);
{ CR4_PGE, "PGE ", "pge "},
#define CR4_DEFAULT (CR4_PAE|CR4_PGE|CR4_PSE|CR4_OSFXSR|CR4_OSXMMEXCPT)
cr4 |= CR4_PGE; /* enable global TLB caching */
lcr4(cr4 & ~CR4_PGE);
if (cr4save & CR4_PGE)
lcr4(cr4save & ~CR4_PGE);
lcr4(rcr4() | CR4_PGE); /* enable hardware (via %cr4) */