From 9b5e7971dc3b31721499cd44ffd049132718c49f Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Mon, 21 Feb 2022 17:05:19 -0800
Subject: [PATCH] hle: kernel: k_system_control: Add GetRealMemorySize and
 update GetKernelPhysicalBaseAddress.

---
 .../kernel/board/nintendo/nx/k_system_control.cpp    | 12 +++++++++++-
 .../hle/kernel/board/nintendo/nx/k_system_control.h  |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/core/hle/kernel/board/nintendo/nx/k_system_control.cpp b/src/core/hle/kernel/board/nintendo/nx/k_system_control.cpp
index 702cacffc0..8027bec009 100644
--- a/src/core/hle/kernel/board/nintendo/nx/k_system_control.cpp
+++ b/src/core/hle/kernel/board/nintendo/nx/k_system_control.cpp
@@ -39,6 +39,10 @@ Smc::MemoryArrangement GetMemoryArrangeForInit() {
 }
 } // namespace
 
+size_t KSystemControl::Init::GetRealMemorySize() {
+    return GetIntendedMemorySize();
+}
+
 // Initialization.
 size_t KSystemControl::Init::GetIntendedMemorySize() {
     switch (GetMemorySizeForInit()) {
@@ -53,7 +57,13 @@ size_t KSystemControl::Init::GetIntendedMemorySize() {
 }
 
 PAddr KSystemControl::Init::GetKernelPhysicalBaseAddress(u64 base_address) {
-    return base_address;
+    const size_t real_dram_size = KSystemControl::Init::GetRealMemorySize();
+    const size_t intended_dram_size = KSystemControl::Init::GetIntendedMemorySize();
+    if (intended_dram_size * 2 < real_dram_size) {
+        return base_address;
+    } else {
+        return base_address + ((real_dram_size - intended_dram_size) / 2);
+    }
 }
 
 bool KSystemControl::Init::ShouldIncreaseThreadResourceLimit() {
diff --git a/src/core/hle/kernel/board/nintendo/nx/k_system_control.h b/src/core/hle/kernel/board/nintendo/nx/k_system_control.h
index 52f230cede..df2a17f2a2 100644
--- a/src/core/hle/kernel/board/nintendo/nx/k_system_control.h
+++ b/src/core/hle/kernel/board/nintendo/nx/k_system_control.h
@@ -13,6 +13,7 @@ public:
     class Init {
     public:
         // Initialization.
+        static std::size_t GetRealMemorySize();
         static std::size_t GetIntendedMemorySize();
         static PAddr GetKernelPhysicalBaseAddress(u64 base_address);
         static bool ShouldIncreaseThreadResourceLimit();