ICACHE_ALIAS_MASK   80 arch/xtensa/include/asm/page.h # define ICACHE_ALIAS(a)	(((a) & ICACHE_ALIAS_MASK) >> PAGE_SHIFT)
ICACHE_ALIAS_MASK   81 arch/xtensa/include/asm/page.h # define ICACHE_ALIAS_EQ(a,b)	((((a) ^ (b)) & ICACHE_ALIAS_MASK) == 0)