sysupdater: Add ValidateUpdate, begin implementing Async logic

stratosphere/ams_mitm/source/sysupdater/sysupdater_thread_allocator.hpp

@@ -0,0 +1,51 @@
+/*
+ * 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 <stratosphere.hpp>
+
+namespace ams::mitm::sysupdater {
+
+    struct ThreadInfo {
+        os::ThreadType *thread;
+        int priority;
+        void *stack;
+        size_t stack_size;
+    };
+
+    /* NOTE: Nintendo uses a util::BitArray, but this seems excessive. */
+    class ThreadAllocator {
+        private:
+            os::ThreadType *thread_list;
+            const int thread_priority;
+            const int thread_count;
+            u8 *stack_heap;
+            const size_t stack_heap_size;
+            const size_t stack_size;
+            u64 bitmap;
+            os::SdkMutex mutex;
+        public:
+            constexpr ThreadAllocator(os::ThreadType *thread_list, int count, int priority, u8 *stack_heap, size_t stack_heap_size, size_t stack_size)
+                : thread_list(thread_list), thread_priority(priority), thread_count(count), stack_heap(stack_heap), stack_heap_size(stack_heap_size), stack_size(stack_size), bitmap()
+            {
+                AMS_ASSERT(count <= static_cast<int>(stack_heap_size / stack_size));
+                AMS_ASSERT(count <= static_cast<int>(BITSIZEOF(this->bitmap)));
+            }
+
+            Result Allocate(ThreadInfo *out);
+            void Free(const ThreadInfo &info);
+    };
+
+}