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path: root/arch/powerpc/include/asm/pte-common.h
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2009-09-24powerpc/mm: Fix 40x and 8xx vs. _PAGE_SPECIALBenjamin Herrenschmidt
The test to check whether we have _PAGE_SPECIAL defined is broken, since we always define it, just not always to a meaninful value :-) That broke 8xx and 40x under some circumstances. This fixes it by adding _PAGE_SPECIAL for both of these since they had a free PTE bit, and removing the condition around advertising it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-08-27powerpc/mm: Cleanup handling of execute permissionBenjamin Herrenschmidt
This is an attempt at cleaning up a bit the way we handle execute permission on powerpc. _PAGE_HWEXEC is gone, _PAGE_EXEC is now only defined by CPUs that can do something with it, and the myriad of #ifdef's in the I$/D$ coherency code is reduced to 2 cases that hopefully should cover everything. The logic on BookE is a little bit different than what it was though not by much. Since now, _PAGE_EXEC will be set by the generic code for executable pages, we need to filter out if they are unclean and recover it. However, I don't expect the code to be more bloated than it already was in that area due to that change. I could boast that this brings proper enforcing of per-page execute permissions to all BookE and 40x but in fact, we've had that now for some time as a side effect of my previous rework in that area (and I didn't even know it :-) We would only enable execute permission if the page was cache clean and we would only cache clean it if we took and exec fault. Since we now enforce that the later only work if VM_EXEC is part of the VMA flags, we de-fact already enforce per-page execute permissions... Unless I missed something Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-08-20powerpc: Add memory management headers for new 64-bit BookEBenjamin Herrenschmidt
This adds the PTE and pgtable format definitions, along with changes to the kernel memory map and other definitions related to implementing support for 64-bit Book3E. This also shields some asm-offset bits that are currently only relevant on 32-bit We also move the definition of the "linux" page size constants to the common mmu.h file and add a few sizes that are relevant to embedded processors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-04-07powerpc: Fix oops when loading modulesPaul Mackerras
This fixes a problem reported by Sean MacLennan where loading any module would cause an oops. We weren't marking the pages containing the module text as having hardware execute permission, due to a bug introduced in commit 8d1cf34e ("powerpc/mm: Tweak PTE bit combination definitions"), hence trying to execute the module text caused an exception on processors that support hardware execute permission. This adds _PAGE_HWEXEC to the definitions of PAGE_KERNEL_X and PAGE_KERNEL_ROX to fix this problem. Reported-by: Sean MacLennan <smaclennan@pikatech.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-03-24powerpc/mm: Merge various PTE bits and accessors definitionsBenjamin Herrenschmidt
Now that they are almost identical, we can merge some of the definitions related to the PTE format into common files. This creates a new pte-common.h which is included by both 32 and 64-bit right after the CPU specific pte-*.h file, and which defines some bits to "default" values if they haven't been defined already, and then provides a generic definition of most of the bit combinations based on these and exposed to the rest of the kernel. I also moved to the common pgtable.h most of the "small" accessors to the PTE bits and modification helpers (pte_mk*). The actual accessors remain in their separate files. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>