In this example, there are 3 levels of page table entries. The hart will start the hardware table walk from the L1 page table entry. In the Sv39 scheme, there are 512 page table entries in L1 page table entry. A hart can quickly locate the entry using VPN2 number, in this case, e...
Shgatpa For each supported virtual memory scheme SvNN supported in satp, the corresponding hgatp SvNNx4 mode must be supported. The hgatp mode Bare must also be supported. RVA23S64 Optional Extensions RVA23S64 has ten unprivileged options (Zvkng, Zvksg, Zacas, Zvbc, Zfh, Zbc, Zvfh,...
The Sv32 page-based virtual-memory scheme described in Section [sec:sv32] supports 34-bit physical addresses for RV32, so the PMP scheme must support addresses wider than XLEN for RV32. The Sv39 and Sv48 page-based virtual-memory schemes described in Sections [sec:sv39] and [sec:sv48...
In Sv39, Sv48, and Sv57, when a PTE has N=1, the PTE represents a translation that is part of a range of contiguous virtual-to-physical translations with the same values for PTE bits 5–0. Such ranges must be of a naturally aligned power-of-2 (NAPOT) granularity larger than the ...
{cheri_pte_ext_name}extension adds new bits to RISC-V's Page Table Entry (PTE) format. {cheri_pte_ext_name}requires at least one virtual memory translation scheme (_Sv39_,_Sv48_or_Sv57_) to be implemented. Implementing any virtual memory translation scheme (_Sv39_,_Sv48_or_Sv57_)...
ShgatpaFor each supported virtual memory scheme SvNN supported insatp, the corresponding hgatp SvNNx4 mode must be supported. Thehgatpmode Bare must also be supported. Note Sha, Shcounterenw, Shvstvala, Shtvala, Shvstvecd, Shvsatpa, and Shgatpa are new extension names. Sha was introduc...
最近几年RISC-V的大火,让IC行业开始关注RISC-V这个迅猛发展的架构,但提到这个年轻的架构,大家最先想到的是,薄弱的生态,硬件的碎片化。RISC-V从发展之初就旨在提供高度模块化和可拓展的指令集,用户甚至可以自己拓展指令集,这种灵活性有利于特定方向的芯片优化。但随之而来的问题就是各个厂商对于拓展的支持各不相同,甚...
For RV64, Privilege S implements the Sv39 Virtual Memory scheme 1.2. CPU microarchitecture options Barrel-shifter (faster, more expensive hardware) or serial shifter (cheaper, slower hardware) for Shift instructions Multipliers inferred by RTL Syntheis tool (faster, more expensive hardware), or seri...
The IOTLB implements the Sv39/Sv39x4 virtual memory scheme. Implemented Two-stage Address Translation Sv39/Sv39x4. Includes support for 1GiB and 2MiB superpages. Implemented Command Queue and Fault/Event Queue No support for ATS commands Implemented MSI Translation Basic-translate and MRIF modes....
In that spirit, Spike aims to follow the SemVer versioning scheme, in which major version numbers are incremented when backwards-incompatible API changes are made; minor version numbers are incremented when new APIs are added; and patch version numbers are incremented when bugs are fixed in a ...