0f7aeab0e7
Summary: Some drivers need special memory requirements. X86 solves this with a pmap_change_attr() API, which DRM uses for changing the mapping of the GART and other memory regions. Implement the same function for PowerPC. AIM currently does not need this, but will in the future for DRM, so a default is added for that, for business as usual. Book-E has some drivers coming down that do require non-default memory coherency. In this case, the Datapath Acceleration Architecture (DPAA) based ethernet controller has 2 regions for the buffer portals: cache-inhibited, and cache-enabled. By default, device memory is cache-inhibited. If the cache-enabled memory regions are mapped cache-inhibited, an alignment exception is thrown on access. Test Plan: Tested with a new driver to be added after this (DPAA dTSEC ethernet driver). No alignment exceptions thrown, driver works as expected with this. Reviewed By: nwhitehorn Sponsored by: Alex Perez/Inertial Computing Differential Revision: https://reviews.freebsd.org/D5471 |
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| aim | ||
| booke | ||
| conf | ||
| cpufreq | ||
| fpu | ||
| include | ||
| mambo | ||
| mikrotik | ||
| mpc85xx | ||
| ofw | ||
| powermac | ||
| powerpc | ||
| ps3 | ||
| pseries | ||
| psim | ||