Exemplo n.º 1
0
        /// <summary>
        /// Get the Memory Map Information from Multiboot
        /// </summary>
        /// <returns>Returns an array of MemoryMaps containing the Multiboot Memory Map information. The array may have empty values at the end.</returns>
        public static unsafe MemoryMap[] GetMemoryMap()
        {
            if (!Multiboot2.MemoryMapExists())
            {
                throw new Exception("No Memory Map was returned by Multiboot");
            }

            var rawMap     = new RawMemoryMap[64];
            var baseMap    = (RawMemoryMap *)((uint *)Multiboot2.MemoryMap + (uint)16);
            var currentMap = baseMap;

            uint totalSize = Multiboot2.MemoryMap->Size - 16;
            uint entrySize = Multiboot2.MemoryMap->EntrySize;

            int counter = 0;

            while ((uint)currentMap < ((uint)baseMap + totalSize) && counter < 64)
            {
                rawMap[counter++] = *currentMap;
                currentMap        = (RawMemoryMap *)((uint)currentMap + entrySize);
            }

            if (counter >= 64)
            {
                throw new Exception("Memory Map returned too many segments");
            }

            var entireMap = new MemoryMap[counter];

            for (int i = 0; i < counter; i++)
            {
                var rawMemoryMap = rawMap[i];
                entireMap[i] = new MemoryMap
                {
                    Address = rawMemoryMap.Address,
                    Length  = rawMemoryMap.Length,
                    Type    = rawMemoryMap.Type
                };
            }
            return(entireMap);
        }
Exemplo n.º 2
0
        /// <summary>
        /// Get the Memory Map Information from Multiboot
        /// </summary>
        /// <returns>Returns an array of MemoryMaps containing the Multiboot Memory Map information. The array may have empty values at the end.</returns>
        public static unsafe MemoryMap[] GetMemoryMap()
        {
            if (!MemoryMapExists())
            {
                throw new Exception("No Memory Map was returned by Multiboot");
            }
            var rawMap = new RawMemoryMap[64];
            //var currentMap = (RawMemoryMap*)false;
            int counter = 0;

            /*while ((uint)currentMap < (Bootstrap.MultibootHeader->memMapAddress + Bootstrap.MultibootHeader->memMapLength) && counter < 64)
             * {
             *  rawMap[counter++] = *currentMap;
             *  currentMap = (RawMemoryMap*)((uint*)currentMap + ((currentMap->Size + 4 )>> 2)); //The size is in bits, not bytes
             *  if (currentMap->Size == 0)
             *  {
             *      break;
             *  }
             * }*/

            if (counter >= 64)
            {
                throw new Exception("Memory Map returned too many segments");
            }

            var entireMap = new MemoryMap[counter];

            for (int i = 0; i < counter; i++)
            {
                var rawMemoryMap = rawMap[i];
                entireMap[i] = new MemoryMap
                {
                    Address    = (ulong)rawMemoryMap.HighBaseAddr << 32 | rawMemoryMap.LowBaseAddr,
                        Length = (ulong)rawMemoryMap.HighLength << 32 | rawMemoryMap.LowLength,
                        Type   = rawMemoryMap.Type
                };
            }
            return(entireMap);
        }