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[kernel] Set framebuffer to write-combining

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Several changes were needed to make this work:

- Update the page_table::flags to understand memory caching types
- Set up the PAT MSR to add the WC option
- Make page-offset area mapped as WT
- Add all the MTRR and PAT MSRs, and log the MTRRs for verification
- Add a vm_area flag for write_combining
This commit is contained in:
Justin C. Miller
2021-01-17 20:49:47 -08:00
parent cfeeba4400
commit 03b2d0dac7
10 changed files with 152 additions and 38 deletions
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3
src/kernel/vm_space.cpp
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@@ -170,7 +170,8 @@ vm_space::page_in(const vm_area &vma, uintptr_t offset, uintptr_t phys, size_t c
page_table::flag flags =
page_table::flag::present |
(m_kernel ? page_table::flag::none : page_table::flag::user) |
((vma.flags() && vm_flags::write) ? page_table::flag::write : page_table::flag::none);
((vma.flags() && vm_flags::write) ? page_table::flag::write : page_table::flag::none) |
((vma.flags() && vm_flags::write_combine) ? page_table::flag::wc : page_table::flag::none);
page_table::iterator it {virt, m_pml4};