[Kernel] Added support for custom kernel version

src/xenia/kernel/kernel_state.cc

@@ -38,6 +38,9 @@ DEFINE_uint32(max_signed_profiles, 4,
               "Limits how many profiles can be assigned. Possible values: 1-4",
               "Kernel");
 
+DEFINE_uint32(kernel_build_version, 1888, "Define current kernel version",
+              "Kernel");
+
 namespace xe {
 namespace kernel {
 
@@ -66,6 +69,7 @@ KernelState::KernelState(Emulator* emulator)
   user_profiles_.emplace(0, std::make_unique<xam::UserProfile>(0));
 
   InitializeKernelGuestGlobals();
+  kernel_version_ = KernelVersion(cvars::kernel_build_version);
 
   auto content_root = emulator_->content_root();
   if (!content_root.empty()) {

src/xenia/kernel/kernel_state.h

@@ -48,6 +48,8 @@ namespace kernel {
 
 constexpr fourcc_t kKernelSaveSignature = make_fourcc("KRNL");
 
+static constexpr const uint16_t kBaseKernelBuildVersion = 1888;
+
 // (?), used by KeGetCurrentProcessType
 constexpr uint32_t X_PROCTYPE_IDLE = 0;
 constexpr uint32_t X_PROCTYPE_TITLE = 1;
@@ -145,6 +147,27 @@ struct KernelGuestGlobals {
 struct DPCImpersonationScope {
   uint8_t previous_irql_;
 };
+
+struct KernelVersion {
+  union {
+    xe::be<uint64_t> value;
+
+    struct {
+      xe::be<uint16_t> major;
+      xe::be<uint16_t> minor;
+      xe::be<uint16_t> build;
+      xe::be<uint16_t> qfe;
+    };
+  };
+
+  KernelVersion(uint16_t build_ver = kBaseKernelBuildVersion) {
+    major = 2;
+    minor = 0;
+    build = std::max(kBaseKernelBuildVersion, build_ver);
+    qfe = 0;
+  }
+};
+
 class KernelState {
  public:
   explicit KernelState(Emulator* emulator);
@@ -200,6 +223,8 @@ class KernelState {
   // Access must be guarded by the global critical region.
   util::ObjectTable* object_table() { return &object_table_; }
 
+  const KernelVersion* GetKernelVersion() const { return &kernel_version_; }
+
   uint32_t GetSystemProcess() const {
     return kernel_guest_globals_ + offsetof(KernelGuestGlobals, system_process);
   }
@@ -332,6 +357,8 @@ class KernelState {
   std::map<uint8_t, std::unique_ptr<xam::UserProfile>> user_profiles_;
   std::unique_ptr<AchievementManager> achievement_manager_;
 
+  KernelVersion kernel_version_;
+
   xe::global_critical_region global_critical_region_;
 
   // Must be guarded by the global critical region.

src/xenia/kernel/xbdm/xbdm_misc.cc

@@ -13,8 +13,10 @@
 #include "xenia/kernel/xbdm/xbdm_private.h"
 #include "xenia/kernel/xthread.h"
 #include "xenia/xbox.h"
+
 // chrispy: no idea what a real valid value is for this
 static constexpr const char DmXboxName[] = "Xbox360Name";
+
 namespace xe {
 namespace kernel {
 namespace xbdm {
@@ -142,8 +144,8 @@ dword_result_t DmGetSystemInfo_entry(pointer_t<XBDM_SYSTEM_INFO> info) {
   info->base_kernel_version.minor = info->kernel_version.minor = 0;
   info->base_kernel_version.qfe = info->kernel_version.qfe = 0;
 
-  info->base_kernel_version.build = 1888;
-  info->kernel_version.build = 13139;
+  info->base_kernel_version.build = kBaseKernelBuildVersion;
+  info->kernel_version.build = kernel_state()->GetKernelVersion()->build;
 
   return XBDM_SUCCESSFUL;
 }

src/xenia/kernel/xboxkrnl/xboxkrnl_module.cc

@@ -205,15 +205,12 @@ XboxkrnlModule::XboxkrnlModule(Emulator* emulator, KernelState* kernel_state)
   // XboxKrnlVersion (8b)
   // Kernel version, looks like 2b.2b.2b.2b.
   // I've only seen games check >=, so we just fake something here.
-  uint32_t pXboxKrnlVersion = memory_->SystemHeapAlloc(8);
+  uint32_t pXboxKrnlVersion = memory_->SystemHeapAlloc(sizeof(KernelVersion));
   auto lpXboxKrnlVersion = memory_->TranslateVirtual(pXboxKrnlVersion);
   export_resolver_->SetVariableMapping(
       "xboxkrnl.exe", ordinals::XboxKrnlVersion, pXboxKrnlVersion);
-  xe::store_and_swap<uint16_t>(lpXboxKrnlVersion + 0, 2);
-  xe::store_and_swap<uint16_t>(lpXboxKrnlVersion + 2, 0xFFFF);
-  xe::store_and_swap<uint16_t>(lpXboxKrnlVersion + 4, 0xFFFF);
-  xe::store_and_swap<uint8_t>(lpXboxKrnlVersion + 6, 0x80);
-  xe::store_and_swap<uint8_t>(lpXboxKrnlVersion + 7, 0x00);
+  std::memcpy(lpXboxKrnlVersion, kernel_state_->GetKernelVersion(),
+              sizeof(KernelVersion));
 
   export_resolver_->SetVariableMapping("xboxkrnl.exe",
                                        ordinals::KeTimeStampBundle,