Hi,
On 12/3/19 7:27 AM, Jacob Pan wrote:
On Thu, 28 Nov 2019 10:25:47 +0800
Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx> wrote:
This adds functions to manipulate first level page tables
which could be used by a scalale mode capable IOMMU unit.
FL and SL page tables are very similar, and I presume we are not using
all the flag bits in FL paging structures for DMA mapping. Are there
enough relevant differences to warrant a new set of helper functions
for FL? Or we can merge into one.
I ever thought about this and I am still open for this suggestion.
We had a quick compare on these two page tables. The only concern is the
read/write/present encoding. The present bit in first level implies read
permission while second level page table explicitly has a READ bit.
(recalled from memory, correct me if it's bad. :-)).
Anyway, let's listen to more opinions.
Best regards,
baolu
