1 files changed, 127 insertions, 0 deletions
diff --git a/src/kernel/HALKit/AMD64/Network/Generic+Basic+RTL8139.cpp b/src/kernel/HALKit/AMD64/Network/Generic+Basic+RTL8139.cpp
new file mode 100644
index 00000000..2f6cc6da
--- /dev/null
+++ b/src/kernel/HALKit/AMD64/Network/Generic+Basic+RTL8139.cpp
@@ -0,0 +1,127 @@
+// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
+// Licensed under the Apache License, Version 2.0 (see LICENSE file)
+// Official repository: https://github.com/nekernel-org/nekernel
+
+#include <DmaKit/DmaPool.h>
+#include <HALKit/AMD64/Processor.h>
+#include <modules/ACPI/ACPIFactoryInterface.h>
+
+using namespace Kernel;
+using namespace Kernel::HAL;
+
+STATIC UInt16 kRTLIOBase = 0xFFFF;
+
+STATIC BOOL kTXRXEnabled = NO;
+
+STATIC UInt32                 kRXOffset     = 0UL;
+STATIC constexpr CONST UInt32 kRXBufferSize = 8192 + 16 + 1500;
+
+STATIC UInt8* kRXUpperLayer = nullptr;
+STATIC UInt8* kRXBuffer     = nullptr;
+
+/***********************************************************************************/
+///@brief RTL8139 Init routine.
+/***********************************************************************************/
+
+EXTERN_C BOOL rtl_init_nic_rtl8139(UInt16 io_base) {
+  if (kTXRXEnabled) return NO;
+
+  kRTLIOBase = io_base;
+
+  MUST_PASS(io_base != 0xFFFF);
+
+  kRXBuffer = reinterpret_cast<UInt8*>(rtl_dma_alloc(sizeof(UInt8) * kRXBufferSize, 0));
+
+  MUST_PASS(kRXBuffer);
+
+  /// Reset first.
+
+  rt_out8(io_base + 0x37, 0x10);
+
+  UInt16 timeout = 0U;
+
+  while (rt_in8(io_base + 0x37) & 0x10) {
+    ++timeout;
+    if (timeout > 0x1000) break;
+  }
+
+  if (timeout <= 0x1000) {
+    return NO;
+  }
+
+  rt_out32(io_base + 0x30, (UInt32) (UIntPtr) kRXBuffer);
+
+  rt_out8(io_base + 0x37, 0x0C);
+
+  rt_out32(io_base + 0x44, 0xF | (1 << 7));
+
+  rt_out16(io_base + 0x3C, 0x0005);
+
+  kTXRXEnabled = YES;
+
+  return YES;
+}
+
+/***********************************************************************************/
+/// @brief RTL8139 I/O interrupt handler.
+/// @param rsp stack pointer.
+/// @note This function is called when the device interrupts to retrieve network data.
+/***********************************************************************************/
+
+EXTERN_C Void rtl_rtl8139_interrupt_handler(UIntPtr rsp) {
+  if (kRTLIOBase == 0xFFFF || kRTLIOBase == 0) return;
+
+  NE_UNUSED(rsp);
+
+  UInt16 status = rt_in16(kRTLIOBase + 0x3E);
+  rt_out16(kRTLIOBase + 0x3E, status);
+
+  if (status & 0x01) {
+    // While we receive data.
+    while ((rt_in8(kRTLIOBase + 0x37) & 0x01) == 0) {
+      // We grab an offset from the RX buffer.
+      UInt32 offset = kRXOffset % kRXBufferSize;
+
+      // If the offset is too high, we reset it.
+      if (offset >= (kRXBufferSize - 16)) {
+        kRXOffset = 0UL;
+        offset    = 0UL;
+      }
+
+      volatile UInt8* packet = kRXBuffer + offset + 4;
+      UInt16          len    = *(UInt16*) (kRXBuffer + offset + 2);
+
+      kRXUpperLayer[(offset + 4)] = *packet;
+      kRXOffset += (len + 4);
+
+      rt_out16(kRTLIOBase + 0x38, (UInt16) (kRXOffset - 16));
+    }
+  }
+
+  if (!(status & 0x04)) {
+    err_global_get() = kErrorNoNetwork;
+  }
+}
+
+/***********************************************************************************/
+/// @brief RTL8139 get upper layer function
+/// @return the upper layer.
+/// @retval nullptr if no upper layer is set.
+/// @retval pointer to the upper layer if set.
+/***********************************************************************************/
+
+EXTERN_C UInt8* rtl_rtl8139_get_upper_layer() {
+  return kRXUpperLayer;
+}
+
+/***********************************************************************************/
+/// @brief RTL8139 set upper layer function
+/// @param layer the upper layer.
+/***********************************************************************************/
+
+EXTERN_C BOOL rtl_rtl8139_set_upper_layer(UInt8* layer) {
+  if (!layer) return NO;
+  kRXUpperLayer = layer;
+
+  return YES;
+}