| commit | 5c4bef62d9e1163add95632129f5a48cb16a448c | [log] [tgz] |
|---|---|---|
| author | Pierre-Clément Tosi <ptosi@google.com> | Tue Aug 13 22:07:55 2024 +0100 |
| committer | Pierre-Clément Tosi <ptosi@google.com> | Wed Aug 14 15:13:19 2024 +0100 |
| tree | de73f1a52b6825f8323a2d6435532db0f8c0828a | |
| parent | fd3d6469c77c8fabd54a44409e796e95128938b1 [diff] |
vmbase_example: Clarify that PageTable is dropped The code calls init_page_table() at some point and, based on the name of the function and when it gets called (right before vmbase_example accesses the PCI BARs), it seems to be to configure the page tables in use. However, the PageTable struct is local to the function and gets dropped when it returns. As a result, TTBR0_EL1 (which was reprogrammed by page_table.activate()) reverts back to its previous value, which was the hard-coded page tables in idmap.S! The reason why the accesses to the PCI BAR or (right before) to the DT don't result in page faults is because they respectively fall in the DEVICE_REGION ([0; 1Gib[) and dtb_region, both of which are already mapped in idmap.S. Instead, keep the code unmodified but explicitly show that we're dropping the page_table struct and mention it in a comment. No functional change intended. Test: atest vmbase_example.integration_test Change-Id: Iaa2b21f42dc9afcebe2192fe7fdcfc4df80d01e8
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