1 files changed, 91 insertions, 0 deletions
diff --git a/dev/kernel/DmaKit/DmaPool.h b/dev/kernel/DmaKit/DmaPool.h
new file mode 100644
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--- /dev/null
+++ b/dev/kernel/DmaKit/DmaPool.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2025 Amlal El Mahrouss. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <HALKit/AMD64/Processor.h>
+#include <KernelKit/DebugOutput.h>
+
+#ifdef __NE_AMD64__
+#define kNeDMAPoolStart (0x1000000)
+#define kNeDMAPoolSize (0x1000000)
+
+namespace Kernel {
+/// @brief DMA pool base pointer, here we're sure that AHCI or whatever tricky standard sees it.
+inline UInt8*       kDmaPoolPtr = (UInt8*) kNeDMAPoolStart;
+inline const UInt8* kDmaPoolEnd = (UInt8*) (kNeDMAPoolStart + kNeDMAPoolSize);
+
+/***********************************************************************************/
+/// @brief allocate from the rtl_dma_alloc system.
+/// @param size the size of the chunk to allocate.
+/// @param align alignement of pointer.
+/***********************************************************************************/
+inline VoidPtr rtl_dma_alloc(SizeT size, SizeT align) {
+  if (!size) {
+    return nullptr;
+  }
+
+  UIntPtr addr = (UIntPtr) kDmaPoolPtr;
+
+  /// here we just align the address according to a `align` variable, i'd rather be a power of two
+  /// really.
+  addr = (addr + (align - 1)) & ~(align - 1);
+
+  if ((addr + size) >= reinterpret_cast<UIntPtr>(kDmaPoolEnd)) {
+    kout << "DMA Pool is exhausted!\r";
+
+    err_global_get() = kErrorDmaExhausted;
+
+    return nullptr;
+  }
+
+  kDmaPoolPtr = (UInt8*) (addr + size);
+  return (VoidPtr) addr;
+}
+
+/***********************************************************************************/
+/// @brief Free DMA pointer.
+/***********************************************************************************/
+inline Void rtl_dma_free(SizeT size) {
+  if (!size) return;
+
+  kDmaPoolPtr = (UInt8*) (kDmaPoolPtr - size);
+}
+
+/***********************************************************************************/
+/// @brief Flush DMA pointer.
+/***********************************************************************************/
+inline Void rtl_dma_flush(VoidPtr ptr, SizeT size_buffer) {
+  if (ptr > kDmaPoolEnd) {
+    return;
+  }
+
+  if (!ptr || ptr < (UInt8*) kNeDMAPoolStart) {
+    return;
+  }
+
+  for (SizeT buf_idx = 0UL; buf_idx < size_buffer; ++buf_idx) {
+    HAL::mm_memory_fence((VoidPtr) ((UInt8*) ptr + buf_idx));
+  }
+}
+}  // namespace Kernel
+#endif
+\ No newline at end of file