2017-12-13 17:45 GMT+08:00 Guo Ren <ren_...@c-sky.com>: > Hello, > > CPU team could improve the tlbop_*. Eg: Design a hardware > internal flag bit for SR_TLB_VPN, tlbop_* will invalid it and mtsr > SR_TLB_VPN will valid it. > > So: > On Wed, Dec 13, 2017 at 05:03:33PM +0800, Greentime Hu wrote: >> mtsr addr1 NDS32_SR_TLB_VPN >> interrupt coming >> mtsr addr2 NDS32_SR_TLB_VPN <- TLB_VPN has been set to addr2 > mtsr SR_TLB_VPN will valid the flag bit >> tlbop_rwr(*pte); > tlbop_rwr will invalid SR_TLB_VPN flag bit >> interrupt finish >> tlbop_rwr(*pte); <- it will use the wrong TLB_VPN > Because SR_TLB_VPN is in a invalid state, no operation happen on > tlbop_rwr. > > Then they are atomic safe ,no spin_lock_irq need. > :) >
Oh, I see. I may propose this idea to our ARCH colleagues for the next version design. Many thanks.
