在实现上,需要提供一个PMA checker来检查到物理内存的访存操作是否违反了相应内存的属性(比如试图向一个只读的区域写入数据)。如刚才所述,PMA checker该怎么实现完全由具体实现者负责,也就是由实现者定义物理内存空间各个部分的规则属性。 physical memory protection pmp是priv spec设计的一个物理内存保护机制。其定义了...
I wonder if they’ll also push a version for safety, with HP cores in dual-lockstep and lp as checker core. Reply andelf 2 years ago andelf Never mind. There is no CAN peripheral… Maybe could work using EtherCAN, but it’s a long-shot Reply sordfish 2 years ago andelf...
For RISC-V, we separate out specification and checking of PMAs into a separate hardware structure, the PMA checker. In many cases, the attributes are known at system design time for each physical address region, and can be hardwired into the PMA checker. Where the attributes are run-time ...
Letmptebe the value of theMPTtable entry at addressa+pa.pn[i]x MPT_PTE_SIZE. If accessingmpteviolates a PMA or PMP check, raise an access-fault exception corresponding to the original access type. If any bits or encodings that are reserved for future standard use are set withinmpte, orm...
PMA and PMP As noted in the second paragraph the “big-little” architecture will enable ultra-low-power applications which may occasionally require high computing with the HP cores turned off for most of the time in order to save power. Support for 2D graphics acceleration...