From 4383b26faafa6d8ba13dd1d88d1bd1ce240b43c9 Mon Sep 17 00:00:00 2001
From: Tom <tomut@yahoo.com>
Date: Tue, 25 Jan 2022 17:42:45 -0700
Subject: [PATCH] Kernel: Enable Write-Combine for FramebufferDevice

This enables much faster writing to the userspace mapped framebuffer,
if supported by the hardware.
---
 Kernel/Graphics/FramebufferDevice.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Kernel/Graphics/FramebufferDevice.cpp b/Kernel/Graphics/FramebufferDevice.cpp
index 2882437f6e..ab3dbca7c4 100644
--- a/Kernel/Graphics/FramebufferDevice.cpp
+++ b/Kernel/Graphics/FramebufferDevice.cpp
@@ -59,6 +59,8 @@ ErrorOr<Memory::Region*> FramebufferDevice::mmap(Process& process, OpenFileDescr
         "Framebuffer",
         prot,
         shared));
+    if (auto result = m_userspace_framebuffer_region->set_write_combine(true); result.is_error())
+        dbgln("FramebufferDevice: Failed to enable Write-Combine on Framebuffer: {}", result.error());
     return m_userspace_framebuffer_region;
 }