read_c0_pagegrain
if (read_c0_pagegrain() & PG_IEC)
pr_info("PageGrain: %0x\n", read_c0_pagegrain());
bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
pr_info("CP0_PageGrain: CP0 5.1 (0x%x)\n", read_c0_pagegrain());
pagegrain = read_c0_pagegrain();
pagegrain = read_c0_pagegrain();