From dae1524eb59fac4b4ca0889d220d25e55eccfc84 Mon Sep 17 00:00:00 2001
From: Zephyron <zephyron@citron-emu.org>
Date: Tue, 7 Jan 2025 18:50:11 +1000
Subject: [PATCH] kernel: Implement SystemResourceSize info type for VAMM
 initialization

Adds support for InfoType::SystemResourceSize (0x1C) which is required for
proper initialization of the Virtual Address Memory Manager (VAMM). This
implementation:

1. Adds SystemResourceSize to the InfoType enum in svc_types.h
2. Implements the GetInfo handler for SystemResourceSize in svc_info.cpp
3. Returns 512MB (0x20000000 bytes) as the system resource size
4. Adds debug logging for the SVC call

The 512MB value is chosen based on typical system resource allocations
needed for VAMM initialization on the Nintendo Switch.

This fixes crashes in games that rely on VAMM functionality, particularly
during nn::os::detail::VammManager::InitializeIfEnabled().
---
 src/core/hle/kernel/svc/svc_info.cpp | 10 ++++++++++
 src/core/hle/kernel/svc_types.h      |  1 +
 2 files changed, 11 insertions(+)

diff --git a/src/core/hle/kernel/svc/svc_info.cpp b/src/core/hle/kernel/svc/svc_info.cpp
index 46667a882..bd997dcd4 100644
--- a/src/core/hle/kernel/svc/svc_info.cpp
+++ b/src/core/hle/kernel/svc/svc_info.cpp
@@ -228,6 +228,16 @@ Result GetInfo(Core::System& system, u64* result, InfoType info_id_type, Handle
         *result = system.Kernel().CurrentScheduler()->GetIdleThread()->GetCpuTime();
         R_SUCCEED();
     }
+    case InfoType::SystemResourceSize: {
+        LOG_DEBUG(Kernel_SVC, "called info_type={:#x}, info_subtype={:#x}, handle={:#x}", info_id,
+                  info_sub_id, handle);
+
+        // VAMM (Virtual Address Memory Manager) typically expects a larger memory size
+        // The value below (512MB) is based on typical system resource allocations
+        *result = 0x20000000; // 512MB in bytes
+
+        R_SUCCEED();
+    }
     case InfoType::MesosphereCurrentProcess: {
         // Verify the input handle is invalid.
         R_UNLESS(handle == InvalidHandle, ResultInvalidHandle);
diff --git a/src/core/hle/kernel/svc_types.h b/src/core/hle/kernel/svc_types.h
index f520d1805..3f51fb6fa 100644
--- a/src/core/hle/kernel/svc_types.h
+++ b/src/core/hle/kernel/svc_types.h
@@ -156,6 +156,7 @@ enum class InfoType : u32 {
 
     MesosphereMeta = 65000,
     MesosphereCurrentProcess = 65001,
+    SystemResourceSize = 0x1C,
 };
 
 enum class BreakReason : u32 {