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Read or Write Allocate Policy?

Hi, experts:

在armv8手册中 MAIR_EL1寄存器设置内存属性时,11RW,当 RW都设置为1时,即1111,那是Read Allocate 还是 Write Allocate ?如果是write Allocate的话就和把RW设置为01效果是一样的?

bestwish

  • hi

    read allocate 和 write allocate 并不冲突,

    read allocate是指load的时候在cache里分配slot

    write allocate是指store时候分配,

    所以RW=11是指在load和store时都分配cache slot, 01只是在store是否分配。