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Kernel: Let's try disabling the CPU's page-level caching for framebuffers.

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This commit is contained in:
Andreas Kling 2019-02-07 09:24:41 +01:00
parent 44e1a45b2a
commit 458706c4cf
2 changed files with 24 additions and 1 deletions
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8
Kernel/MemoryManager.cpp
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@ -483,6 +483,8 @@ void MemoryManager::remap_region_page(Region& region, unsigned page_index_in_reg
pte.set_writable(false);
else
pte.set_writable(region.is_writable());
pte.set_cache_disabled(!region.vmo().m_allow_cpu_caching);
pte.set_write_through(!region.vmo().m_allow_cpu_caching);
pte.set_user_allowed(user_allowed);
region.page_directory()->flush(page_laddr);
#ifdef MM_DEBUG
@ -517,6 +519,8 @@ void MemoryManager::map_region_at_address(PageDirectory& page_directory, Region&
pte.set_writable(false);
else
pte.set_writable(region.is_writable());
pte.set_cache_disabled(!region.vmo().m_allow_cpu_caching);
pte.set_write_through(!region.vmo().m_allow_cpu_caching);
} else {
pte.set_physical_page_base(0);
pte.set_present(false);
@ -676,7 +680,9 @@ RetainPtr<VMObject> VMObject::create_anonymous(size_t size)
RetainPtr<VMObject> VMObject::create_framebuffer_wrapper(PhysicalAddress paddr, size_t size)
{
size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
return adopt(*new VMObject(paddr, size));
auto vmo = adopt(*new VMObject(paddr, size));
vmo->m_allow_cpu_caching = false;
return vmo;
}
RetainPtr<VMObject> VMObject::clone()