Hi, This question is about MMU of MBX860 using MPC860 rather than LinuxPPC. I'm sorry to send not proper question to this board. Thank you so much if you let me know proper and also active group.
My question: In MPC860, is there any way for supervisor mode's kernel to access all memory space whether its ASID matches with M_CASID even though some of memory space is configured to check ASID? I appreciate any help. My situation: I'm porting a microkernel into MBX860 using MPC860. For memory protection, this uses MMU even though address translation is not necessary. Only one global memory address page table managed by kernel includes all page table information for all application tasks for performance. It is possible by allocating memory space into each of application tasks. The requirements is that kernel in Privilege state can access all the memory space but application task's access is restricted to the a memory space allocated to itself. I think that the access violation between applications can be checked by using ASID. So, I assign each ASID for memory space for applications and kernel. But I guess when ASID checking is enabled, kernel also can't access other application's memory space because its ASID is different with others' ASID. Thank you so much. Okehee Goh --------------------------------------- Real-Time System lab of CSE of ASU Tel: 480-219-1346 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
