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Merge pull request #2210 from jroweboy/pagetables

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Expose page table to dynarmic for optimized reads and writes to the JIT
This commit is contained in:
Yuri Kunde Schlesner 2016-11-24 19:58:12 -08:00 committed by GitHub
commit ed2ff8df85
3 changed files with 18 additions and 6 deletions
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1
src/core/arm/dynarmic/arm_dynarmic.cpp
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@ -52,6 +52,7 @@ static Dynarmic::UserCallbacks GetUserCallbacks(ARMul_State* interpeter_state) {
user_callbacks.MemoryWrite16 = &Memory::Write16;
user_callbacks.MemoryWrite32 = &Memory::Write32;
user_callbacks.MemoryWrite64 = &Memory::Write64;
user_callbacks.page_table = Memory::GetCurrentPageTablePointers();
return user_callbacks;
}

14
src/core/memory.cpp
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@ -45,13 +45,11 @@ struct SpecialRegion {
* requires an indexed fetch and a check for NULL.
*/
struct PageTable {
static const size_t NUM_ENTRIES = 1 << (32 - PAGE_BITS);
/**
* 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*, NUM_ENTRIES> pointers;
std::array<u8*, PAGE_TABLE_NUM_ENTRIES> pointers;
/**
* Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of
@ -63,13 +61,13 @@ struct PageTable {
* Array 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, NUM_ENTRIES> attributes;
std::array<PageType, PAGE_TABLE_NUM_ENTRIES> attributes;
/**
* Indicates the number of externally cached resources touching a page that should be
* flushed before the memory is accessed
*/
std::array<u8, NUM_ENTRIES> cached_res_count;
std::array<u8, PAGE_TABLE_NUM_ENTRIES> cached_res_count;
};
/// Singular page table used for the singleton process
@ -77,6 +75,10 @@ static PageTable main_page_table;
/// Currently active page table
static PageTable* current_page_table = &main_page_table;
std::array<u8*, PAGE_TABLE_NUM_ENTRIES>* GetCurrentPageTablePointers() {
return &current_page_table->pointers;
}
static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
LOG_DEBUG(HW_Memory, "Mapping %p onto %08X-%08X", memory, base * PAGE_SIZE,
(base + size) * PAGE_SIZE);
@ -84,7 +86,7 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
u32 end = base + size;
while (base != end) {
ASSERT_MSG(base < PageTable::NUM_ENTRIES, "out of range mapping at %08X", base);
ASSERT_MSG(base < PAGE_TABLE_NUM_ENTRIES, "out of range mapping at %08X", base);
// Since pages are unmapped on shutdown after video core is shutdown, the renderer may be
// null here

9
src/core/memory.h
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@ -4,6 +4,7 @@
#pragma once
#include <array>
#include <cstddef>
#include <string>
#include "common/common_types.h"
@ -17,6 +18,7 @@ namespace Memory {
const u32 PAGE_SIZE = 0x1000;
const u32 PAGE_MASK = PAGE_SIZE - 1;
const int PAGE_BITS = 12;
const size_t PAGE_TABLE_NUM_ENTRIES = 1 << (32 - PAGE_BITS);
/// Physical memory regions as seen from the ARM11
enum : PAddr {
@ -166,4 +168,11 @@ void RasterizerFlushRegion(PAddr start, u32 size);
* Flushes and invalidates any externally cached rasterizer resources touching the given region.
*/
void RasterizerFlushAndInvalidateRegion(PAddr start, u32 size);
/**
* Dynarmic has an optimization to memory accesses when the pointer to the page exists that
* can be used by setting up the current page table as a callback. This function is used to
* retrieve the current page table for that purpose.
*/
std::array<u8*, PAGE_TABLE_NUM_ENTRIES>* GetCurrentPageTablePointers();
}