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gpu: Rewrite virtual memory manager using PageTable.

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This commit is contained in:
bunnei 2019-03-03 23:54:16 -05:00
parent 241563d15c
commit 22d3dfbcd4
13 changed files with 497 additions and 228 deletions
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2
src/common/page_table.cpp
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@ -16,6 +16,7 @@ void PageTable::Resize(std::size_t address_space_width_in_bits) {
pointers.resize(num_page_table_entries);
attributes.resize(num_page_table_entries);
backing_addr.resize(num_page_table_entries);
// The default is a 39-bit address space, which causes an initial 1GB allocation size. If the
// vector size is subsequently decreased (via resize), the vector might not automatically
@ -24,6 +25,7 @@ void PageTable::Resize(std::size_t address_space_width_in_bits) {
pointers.shrink_to_fit();
attributes.shrink_to_fit();
backing_addr.shrink_to_fit();
}
} // namespace Common

6
src/common/page_table.h
View file

@ -21,6 +21,8 @@ enum class PageType : u8 {
RasterizerCachedMemory,
/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
Special,
/// Page is allocated for use.
Allocated,
};
struct SpecialRegion {
@ -66,7 +68,7 @@ struct PageTable {
* Contains MMIO handlers that back memory regions whose entries in the `attribute` vector is
* of type `Special`.
*/
boost::icl::interval_map<VAddr, std::set<SpecialRegion>> special_regions;
boost::icl::interval_map<u64, std::set<SpecialRegion>> special_regions;
/**
* Vector of fine grained page attributes. If it is set to any value other than `Memory`, then
@ -74,6 +76,8 @@ struct PageTable {
*/
std::vector<PageType> attributes;
std::vector<u64> backing_addr;
const std::size_t page_size_in_bits{};
};