ARM32 MMU support #244
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ARM32 MMU support #244
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Add pgtable_iterator support for ARM32. This only supports page types used by the kernel on processors without LPAE. Signed-off-by: Timothée Cocault <[email protected]>
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Just wanted to let you know that I haven't forgotten about this. I'm currently working on making drgn's testing setup support other architectures including ARM so that I can properly test this out and review it. I'm going to try patching drgn's test kernels to support |
osandov
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tests.linux_kernel.helpers.test_mm.TestMm.test_read_physical() fails on Arm when the user page is mapped from high memory. Replace it with a test case that uses the test physical address from the test kernel module and asserts the expected PRNG data. (We will probably run into more tests that fail with high memory once #244 is merged.) Signed-off-by: Omar Sandoval <[email protected]>
osandov
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Feb 22, 2023
tests.linux_kernel.helpers.test_mm.TestMm.test_read_physical() fails on Arm when the user page is mapped from high memory. Replace it with a test case that uses the test physical address from the test kernel module and asserts the expected PRNG data. (We will probably run into more tests that fail with high memory once #244 is merged.) Signed-off-by: Omar Sandoval <[email protected]>
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As noted, this is only valid for ARM32 processors without LPAE. Until recently I thought LPAE was the same as Aarch64 but it turns out that no... For these, I think the MMU should be identical or similar to aarch64 but I did not look into it.
I took the liberty of unrolling the loops because it's a 2-level MMU with different page handling. Also it allowed me to keep my sanity :).