5 Commits (831ffceec7a7969ea0cfab615776ca3607f32c7c)

Author	SHA1	Message	Date
Paul Mackerras	2843c99a71	MMU: Implement reading of the process table ... This adds the PID register and repurposes SPR 720 as the PRTBL register, which points to the base of the process table. There doesn't seem to be any point to implementing the partition table given that we don't have hypervisor mode. The MMU caches entry 0 of the process table internally (in pgtbl3) plus the entry indexed by the value in the PID register (pgtbl0). Both caches are invalidated by a tlbie[l] with RIC=2 or by a move to PRTBL. The pgtbl0 cache is invalidated by a move to PID. The dTLB and iTLB are cleared by a move to either PRTBL or PID. Which of the two page table root pointers is used (pgtbl0 or pgtbl3) depends on the MSB of the address being translated. Since the segment checking ensures that address(63) = address(62), this is sufficient to map quadrants 0 and 3. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	5 years ago
Paul Mackerras	f3c6119cf6	tests/mmu: Add a test of PTE refetching on permission error ... Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	5 years ago
Paul Mackerras	8ff8b2f256	tests/mmu: Add a test for dcbz with translation on ... Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	5 years ago
Paul Mackerras	b342312e4e	tests: mmu: Add tests for instruction translation ... This adds tests of instruction translation to the mmu test. This also clears the BSS and improves the linker script. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	5 years ago
Paul Mackerras	882a5a0dc0	tests: Add a test for the MMU radix page table walks ... This adds tests to check that the MMU and dTLB are translating addresses and checking permissions correctly. We use a simple 2-level radix tree. The radix tree maps 2GB of address space and has a 1024-entry page directory pointing to 512-entry page table pages. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	5 years ago