76384bd10f
Current implementation of Radix MMU doesn't support mapping arbitrary virtual addresses, such as the ones generated by "direct mapping" I/O addresses. This caused the system to hang, when early I/O addresses, such as those used by OpenFirmware Frame Buffer, were remapped after the MMU was up. To avoid having to modify mmu_radix_kenter_attr just to support this use case, this change makes early I/O map use virtual addresses from KVA area instead (similar to what mmu_radix_mapdev_attr does), as these can be safely remapped later. Reviewed by: alfredo (earlier version), jhibbits (in irc) MFC after: 2 weeks Sponsored by: Instituto de Pesquisas Eldorado (eldorado.org.br) Differential Revision: https://reviews.freebsd.org/D31232 |
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