[PR #3639] [MERGED] Core: physical backing for flexible and pooled memory allocations #3629

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opened 2026-02-27 22:04:24 +03:00 by kerem · 0 comments

kerem commented

2026-02-27 22:04:24 +03:00

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📋 Pull Request Information

Original PR: https://github.com/shadps4-emu/shadPS4/pull/3639
Author: @StevenMiller123
Created: 9/21/2025
Status: ✅ Merged
Merged: 9/23/2025
Merged by: @georgemoralis

Base: main ← Head: flex-mem-backing

📝 Commits (10+)

adccc11 Fix isDevKit
12ce66f Physical backing for flexible allocations
d97454b Various fixups
81d0737 Fix mistake #1
871af75 Assert + clang
be63ff2 Fix 2
a1c134a Clang
09c4f8d Fix CanMergeWith
0769de1 Clang
c7b9cdb Physical backing for pooled memory

📊 Changes

6 files changed (+179 additions, -44 deletions)

View changed files

📝 src/core/address_space.cpp (+3 -3)
📝 src/core/libraries/kernel/memory.cpp (+1 -1)
📝 src/core/libraries/kernel/memory.h (+19 -16)
📝 src/core/linker.cpp (+2 -2)
📝 src/core/memory.cpp (+113 -21)
📝 src/core/memory.h (+41 -1)

📄 Description

This PR handles partial unmaps of flexible memory. I've created a separate flexible memory map used to track flexible "physical" allocations, calculate free physical addresses to map, and implemented logic in MapMemory and UnmapBytesFromEntry for properly updating this flexible map.

I also added a fix for the isDevKit logic, the backing size wasn't properly updated for the increased direct memory size of isDevKit, which could cause weird issues with direct memory allocations that use the extra space.

This improves Uncharted 4: A Thief’s End™ (CUSA00341), The Last of Us™ Part II (CUSA07820), and FINAL FANTASY XV (CUSA01633) on Windows devices.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/shadps4-emu/shadPS4/pull/3639 **Author:** [@StevenMiller123](https://github.com/StevenMiller123) **Created:** 9/21/2025 **Status:** ✅ Merged **Merged:** 9/23/2025 **Merged by:** [@georgemoralis](https://github.com/georgemoralis) **Base:** `main` ← **Head:** `flex-mem-backing` --- ### 📝 Commits (10+) - [`adccc11`](https://github.com/shadps4-emu/shadPS4/commit/adccc11074e19790737f07df599a0e938523d689) Fix isDevKit - [`12ce66f`](https://github.com/shadps4-emu/shadPS4/commit/12ce66fa4781a6a6ee55e7608bb18d3df2b6bd4b) Physical backing for flexible allocations - [`d97454b`](https://github.com/shadps4-emu/shadPS4/commit/d97454b7c77ba4a70a0411be593455cb090c3aa6) Various fixups - [`81d0737`](https://github.com/shadps4-emu/shadPS4/commit/81d0737fd1cc8b1f74dc4a6bbd26da1be587f3cc) Fix mistake #1 - [`871af75`](https://github.com/shadps4-emu/shadPS4/commit/871af75cdeff400087f2b74ecc897d5aa6e86af8) Assert + clang - [`be63ff2`](https://github.com/shadps4-emu/shadPS4/commit/be63ff2e4b8e773d91255a1c4e33fa52cf9a1811) Fix 2 - [`a1c134a`](https://github.com/shadps4-emu/shadPS4/commit/a1c134aabe079f49fde04863cde2a1ad3f833dd7) Clang - [`09c4f8d`](https://github.com/shadps4-emu/shadPS4/commit/09c4f8d3d2bce787b51d4d0c7f03c6efb7971d03) Fix CanMergeWith - [`0769de1`](https://github.com/shadps4-emu/shadPS4/commit/0769de16f9725ec33122eae0dfd224630b8e2f10) Clang - [`c7b9cdb`](https://github.com/shadps4-emu/shadPS4/commit/c7b9cdbc74f1a276e17f131996085994b98915aa) Physical backing for pooled memory ### 📊 Changes **6 files changed** (+179 additions, -44 deletions) <details> <summary>View changed files</summary> 📝 `src/core/address_space.cpp` (+3 -3) 📝 `src/core/libraries/kernel/memory.cpp` (+1 -1) 📝 `src/core/libraries/kernel/memory.h` (+19 -16) 📝 `src/core/linker.cpp` (+2 -2) 📝 `src/core/memory.cpp` (+113 -21) 📝 `src/core/memory.h` (+41 -1) </details> ### 📄 Description This PR handles partial unmaps of flexible memory. I've created a separate flexible memory map used to track flexible "physical" allocations, calculate free physical addresses to map, and implemented logic in MapMemory and UnmapBytesFromEntry for properly updating this flexible map. I also added a fix for the isDevKit logic, the backing size wasn't properly updated for the increased direct memory size of isDevKit, which could cause weird issues with direct memory allocations that use the extra space. This improves Uncharted 4: A Thief’s End™ (CUSA00341), The Last of Us™ Part II (CUSA07820), and FINAL FANTASY XV (CUSA01633) on Windows devices. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>