From 789bbd7ab5929bbab5b81b39bbf82faf392f13c4 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 231e4d0e1b..a66d633f8e 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 ab432ea78b..e301f67c57 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 {