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memory: Dehardcode the use of a 36-bit address space

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Given games can also request a 32-bit or 39-bit address space, we
shouldn't be hardcoding the address space range as 36-bit.
This commit is contained in:
Lioncash 2018-09-24 10:29:56 -04:00
parent 75603b005b
commit 7fd598636e
6 changed files with 63 additions and 24 deletions
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36
src/core/memory.h
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@ -4,10 +4,10 @@
#pragma once
#include <array>
#include <cstddef>
#include <string>
#include <tuple>
#include <vector>
#include <boost/icl/interval_map.hpp>
#include "common/common_types.h"
#include "core/memory_hook.h"
@ -23,10 +23,8 @@ namespace Memory {
* be mapped.
*/
constexpr std::size_t PAGE_BITS = 12;
constexpr u64 PAGE_SIZE = 1 << PAGE_BITS;
constexpr u64 PAGE_SIZE = 1ULL << PAGE_BITS;
constexpr u64 PAGE_MASK = PAGE_SIZE - 1;
constexpr std::size_t ADDRESS_SPACE_BITS = 36;
constexpr std::size_t PAGE_TABLE_NUM_ENTRIES = 1ULL << (ADDRESS_SPACE_BITS - PAGE_BITS);
enum class PageType : u8 {
/// Page is unmapped and should cause an access error.
@ -62,23 +60,35 @@ struct SpecialRegion {
* mimics the way a real CPU page table works.
*/
struct PageTable {
/**
* Array of memory pointers backing each page. An entry can only be non-null if the
* corresponding entry in the `attributes` array is of type `Memory`.
*/
std::array<u8*, PAGE_TABLE_NUM_ENTRIES> pointers;
explicit PageTable();
explicit PageTable(std::size_t address_space_width_in_bits);
~PageTable();
/**
* Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of
* type `Special`.
* Resizes the page table to be able to accomodate enough pages within
* a given address space.
*
* @param address_space_width_in_bits The address size width in bits.
*/
void Resize(std::size_t address_space_width_in_bits);
/**
* 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<VAddr, std::set<SpecialRegion>> special_regions;
/**
* Array of fine grained page attributes. If it is set to any value other than `Memory`, then
* 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::array<PageType, PAGE_TABLE_NUM_ENTRIES> attributes;
std::vector<PageType> attributes;
};
/// Virtual user-space memory regions