kern: add version bounds checking

libraries/libvapours/include/vapours/svc.hpp

@@ -21,4 +21,5 @@
 
 #include <vapours/svc/svc_types.hpp>
 #include <vapours/svc/svc_definitions.hpp>
+#include <vapours/svc/svc_version.hpp>
 #include <vapours/svc/ipc/svc_message_buffer.hpp>

libraries/libvapours/include/vapours/svc/svc_version.hpp

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <vapours/svc/svc_common.hpp>
+#include <vapours/svc/svc_select_hardware_constants.hpp>
+#include <vapours/util/util_bitpack.hpp>
+
+namespace ams::svc {
+
+    constexpr inline u32 ConvertToSvcMajorVersion(u32 sdk) { return sdk + 4; }
+    constexpr inline u32 ConvertToSdkMajorVersion(u32 svc) { return svc - 4; }
+
+    constexpr inline u32 ConvertToSvcMinorVersion(u32 sdk) { return sdk; }
+    constexpr inline u32 ConvertToSdkMinorVersion(u32 svc) { return svc; }
+
+    struct KernelVersion {
+        using MinorVersion = util::BitPack32::Field<0, 4>;
+        using MajorVersion = util::BitPack32::Field<MinorVersion::Next, 13>;
+    };
+
+    constexpr inline u32 EncodeKernelVersion(u32 major, u32 minor) {
+        util::BitPack32 pack = {};
+        pack.Set<KernelVersion::MinorVersion>(minor);
+        pack.Set<KernelVersion::MajorVersion>(major);
+        return pack.value;
+    }
+
+    constexpr inline u32 GetKernelMajorVersion(u32 encoded) {
+        const util::BitPack32 pack = { encoded };
+        return pack.Get<KernelVersion::MajorVersion>();
+    }
+
+    constexpr inline u32 GetKernelMinorVersion(u32 encoded) {
+        const util::BitPack32 pack = { encoded };
+        return pack.Get<KernelVersion::MinorVersion>();
+    }
+
+    /* Nintendo doesn't support programs targeting SVC versions < 3.0. */
+    constexpr inline u32 RequiredKernelMajorVersion = 3;
+    constexpr inline u32 RequiredKernelMinorVersion = 0;
+
+    constexpr inline u32 RequiredKernelVersion = EncodeKernelVersion(RequiredKernelMajorVersion, RequiredKernelMinorVersion);
+
+    /* This is the highest SVC version supported by Atmosphere, to be updated on new kernel releases. */
+    /* NOTE: Official kernel versions have SVC major = SDK major + 4, SVC minor = SDK minor. */
+    constexpr inline u32 SupportedKernelMajorVersion = ConvertToSvcMajorVersion(10);
+    constexpr inline u32 SupportedKernelMinorVersion = ConvertToSvcMinorVersion( 4);
+
+    constexpr inline u32 SupportedKernelVersion = EncodeKernelVersion(SupportedKernelMajorVersion, SupportedKernelMinorVersion);
+
+}