diff options
Diffstat (limited to '')
-rw-r--r-- | src/common/page_table.cpp | 34 | ||||
-rw-r--r-- | src/common/page_table.h | 37 |
2 files changed, 18 insertions, 53 deletions
diff --git a/src/common/page_table.cpp b/src/common/page_table.cpp index 566b57b62..e5d3090d5 100644 --- a/src/common/page_table.cpp +++ b/src/common/page_table.cpp @@ -6,36 +6,20 @@ namespace Common { -PageTable::PageTable(std::size_t page_size_in_bits) : page_size_in_bits{page_size_in_bits} {} +PageTable::PageTable() = default; PageTable::~PageTable() = default; -void PageTable::Resize(std::size_t address_space_width_in_bits) { - const std::size_t num_page_table_entries = 1ULL - << (address_space_width_in_bits - page_size_in_bits); - +void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits, + bool has_attribute) { + const std::size_t num_page_table_entries{1ULL + << (address_space_width_in_bits - page_size_in_bits)}; pointers.resize(num_page_table_entries); - attributes.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 - // actually reallocate/resize its underlying allocation, which wastes up to ~800 MB for - // 36-bit titles. Call shrink_to_fit to reduce capacity to what's actually in use. - - pointers.shrink_to_fit(); - attributes.shrink_to_fit(); -} - -BackingPageTable::BackingPageTable(std::size_t page_size_in_bits) : PageTable{page_size_in_bits} {} - -BackingPageTable::~BackingPageTable() = default; - -void BackingPageTable::Resize(std::size_t address_space_width_in_bits) { - PageTable::Resize(address_space_width_in_bits); - const std::size_t num_page_table_entries = 1ULL - << (address_space_width_in_bits - page_size_in_bits); backing_addr.resize(num_page_table_entries); - backing_addr.shrink_to_fit(); + + if (has_attribute) { + attributes.resize(num_page_table_entries); + } } } // namespace Common diff --git a/src/common/page_table.h b/src/common/page_table.h index dbc272ab7..1e8bd3187 100644 --- a/src/common/page_table.h +++ b/src/common/page_table.h @@ -5,9 +5,12 @@ #pragma once #include <vector> + #include <boost/icl/interval_map.hpp> + #include "common/common_types.h" #include "common/memory_hook.h" +#include "common/virtual_buffer.h" namespace Common { @@ -47,7 +50,7 @@ struct SpecialRegion { * mimics the way a real CPU page table works. */ struct PageTable { - explicit PageTable(std::size_t page_size_in_bits); + PageTable(); ~PageTable(); /** @@ -56,40 +59,18 @@ struct PageTable { * * @param address_space_width_in_bits The address size width in bits. */ - void Resize(std::size_t address_space_width_in_bits); + void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits, + bool has_attribute); /** * Vector of memory pointers backing each page. An entry can only be non-null if the * corresponding entry in the `attributes` vector is of type `Memory`. */ - std::vector<u8*> pointers; - - /** - * Contains MMIO handlers that back memory regions whose entries in the `attribute` vector is - * of type `Special`. - */ - 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 - * the corresponding entry in `pointers` MUST be set to null. - */ - std::vector<PageType> attributes; - - const std::size_t page_size_in_bits{}; -}; - -/** - * A more advanced Page Table with the ability to save a backing address when using it - * depends on another MMU. - */ -struct BackingPageTable : PageTable { - explicit BackingPageTable(std::size_t page_size_in_bits); - ~BackingPageTable(); + VirtualBuffer<u8*> pointers; - void Resize(std::size_t address_space_width_in_bits); + VirtualBuffer<u64> backing_addr; - std::vector<u64> backing_addr; + VirtualBuffer<PageType> attributes; }; } // namespace Common |