Hartvig Ekner wrote: > > You have to distinguish between physical and virtual memory. The MIPS32 > architecture supports implementations with up to 36 bits of physical > address space, however the virtual address space in kernel and user mode > is as you describe below. > I wasn't talking about the MIP32[tm] cores specifically, I was using a generalization of 32bit. However, this is good to know. All of the data sheets that I just downloaded from the MIPS site for the R4k[X] cores don't mention the 36-bit PA item. Care to elaborate? > One note: Many MIPS32 implementations choose not to implement all 36 PA > bits, but limit themselves to 32 bits. This saves a few bits in the TLB > and a few address lines. > So, if someone did want 36 PA bits on Linux, the TLB exception handlers and a little of the page table construction/management code would have to change. The userspace contraints and such would still remain. Cool. -Steve -- Steven J. Hill - Embedded SW Engineer
