From 367704aa829a515188d87860ffd230b1b2a136c8 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Mon, 15 Apr 2019 23:01:35 -0400
Subject: GPU MemoryManager: Implement ReadBlockUnsafe and WriteBlockUnsafe

---
 src/video_core/memory_manager.cpp | 32 ++++++++++++++++++++++++++++++++
 src/video_core/memory_manager.h   |  2 ++
 2 files changed, 34 insertions(+)

(limited to 'src/video_core')

diff --git a/src/video_core/memory_manager.cpp b/src/video_core/memory_manager.cpp
index 0f4e820aa..3b9f6caf0 100644
--- a/src/video_core/memory_manager.cpp
+++ b/src/video_core/memory_manager.cpp
@@ -226,6 +226,22 @@ void MemoryManager::ReadBlock(GPUVAddr src_addr, void* dest_buffer, std::size_t
     }
 }
 
+void MemoryManager::ReadBlockUnsafe(GPUVAddr src_addr, void* dest_buffer, std::size_t size) const {
+    std::size_t remaining_size{size};
+    std::size_t page_index{src_addr >> page_bits};
+    std::size_t page_offset{src_addr & page_mask};
+
+    while (remaining_size > 0) {
+        const std::size_t copy_amount{
+            std::min(static_cast<std::size_t>(page_size) - page_offset, remaining_size)};
+        std::memcpy(dest_buffer, src_ptr, copy_amount);
+        page_index++;
+        page_offset = 0;
+        dest_buffer = static_cast<u8*>(dest_buffer) + copy_amount;
+        remaining_size -= copy_amount;
+    }
+}
+
 void MemoryManager::WriteBlock(GPUVAddr dest_addr, const void* src_buffer, std::size_t size) {
     std::size_t remaining_size{size};
     std::size_t page_index{dest_addr >> page_bits};
@@ -253,6 +269,22 @@ void MemoryManager::WriteBlock(GPUVAddr dest_addr, const void* src_buffer, std::
     }
 }
 
+void MemoryManager::WriteBlockUnsafe(GPUVAddr dest_addr, const void* src_buffer, std::size_t size) {
+    std::size_t remaining_size{size};
+    std::size_t page_index{dest_addr >> page_bits};
+    std::size_t page_offset{dest_addr & page_mask};
+
+    while (remaining_size > 0) {
+        const std::size_t copy_amount{
+            std::min(static_cast<std::size_t>(page_size) - page_offset, remaining_size)};
+        std::memcpy(dest_ptr, src_buffer, copy_amount);
+        page_index++;
+        page_offset = 0;
+        src_buffer = static_cast<const u8*>(src_buffer) + copy_amount;
+        remaining_size -= copy_amount;
+    }
+}
+
 void MemoryManager::CopyBlock(GPUVAddr dest_addr, GPUVAddr src_addr, std::size_t size) {
     std::size_t remaining_size{size};
     std::size_t page_index{src_addr >> page_bits};
diff --git a/src/video_core/memory_manager.h b/src/video_core/memory_manager.h
index 647cbf93a..29f3860c1 100644
--- a/src/video_core/memory_manager.h
+++ b/src/video_core/memory_manager.h
@@ -67,6 +67,8 @@ public:
 
     void ReadBlock(GPUVAddr src_addr, void* dest_buffer, std::size_t size) const;
     void WriteBlock(GPUVAddr dest_addr, const void* src_buffer, std::size_t size);
+    void ReadBlockUnsafe(GPUVAddr src_addr, void* dest_buffer, std::size_t size) const;
+    void WriteBlockUnsafe(GPUVAddr dest_addr, const void* src_buffer, std::size_t size);
     void CopyBlock(GPUVAddr dest_addr, GPUVAddr src_addr, std::size_t size);
 
 private:
-- 
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