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common: page_table: Update to use VirtualBuffer and simplify.

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This commit is contained in:
bunnei 2020-04-08 22:49:51 -04:00
parent 1d5923e150
commit 4c1812ae37
2 changed files with 18 additions and 53 deletions
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37
src/common/page_table.h
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@ -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;
VirtualBuffer<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;
VirtualBuffer<u64> backing_addr;
/**
* 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();
void Resize(std::size_t address_space_width_in_bits);
std::vector<u64> backing_addr;
VirtualBuffer<PageType> attributes;
};
} // namespace Common