From b208c9cf4f539d989426933cae4c7f63e4499cff Mon Sep 17 00:00:00 2001
From: crueter <crueter@eden-emu.dev>
Date: Tue, 3 Mar 2026 14:28:45 -0500
Subject: [PATCH] [settings] Disable fastmem on Linux systems with non-4kb page
 sizes

Asahi, etc

Signed-off-by: crueter <crueter@eden-emu.dev>
---
 src/common/settings.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/common/settings.cpp b/src/common/settings.cpp
index c952567e63..42fa2aa7f6 100644
--- a/src/common/settings.cpp
+++ b/src/common/settings.cpp
@@ -27,6 +27,10 @@
 #include "common/settings.h"
 #include "common/time_zone.h"
 
+#ifdef __linux__
+#include <unistd.h>
+#endif
+
 namespace Settings {
 
 // Clang 14 and earlier have errors when explicitly instantiating these classes
@@ -178,7 +182,10 @@ bool IsFastmemEnabled() {
         return bool(values.cpuopt_fastmem);
     else if (values.cpu_accuracy.GetValue() == CpuAccuracy::Unsafe)
         return bool(values.cpuopt_unsafe_host_mmu);
-#if !defined(__APPLE__) && !defined(__linux__) && !defined(__ANDROID__) && !defined(_WIN32)
+#if defined(__linux__)
+    // Only 4kb systems support host MMU right now
+    return getpagesize() == 4096;
+#elif !defined(__APPLE__) && !defined(__ANDROID__) && !defined(_WIN32)
     return false;
 #else
     return true;