kernel: lots of tweaks and improvements, WIP: ASN, FileMgr support for OpenHeFS.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/kernel/HALKit/ARM64/HalApplicationProcessor.cpp b/src/kernel/HALKit/ARM64/HalApplicationProcessor.cpp
new file mode 100644
index 00000000..33921a56
--- /dev/null
+++ b/src/kernel/HALKit/ARM64/HalApplicationProcessor.cpp
@@ -0,0 +1,138 @@
+// 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
+
+#define GICD_BASE 0x08000000
+#define GICC_BASE 0x08010000
+
+#define GICD_CTLR 0x000
+#define GICD_ISENABLER 0x100
+#define GICD_ICENABLER 0x180
+#define GICD_ISPENDR 0x200
+#define GICD_ICPENDR 0x280
+#define GICD_IPRIORITYR 0x400
+#define GICD_ITARGETSR 0x800
+#define GICD_ICFGR 0xC00
+
+#define GICC_CTLR 0x000
+#define GICC_PMR 0x004
+#define GICC_IAR 0x00C
+#define GICC_EOIR 0x010
+
+#include <HALKit/ARM64/ApplicationProcessor.h>
+#include <HALKit/ARM64/Processor.h>
+#include <KernelKit/DebugOutput.h>
+#include <KernelKit/HardwareThreadScheduler.h>
+#include <KernelKit/ProcessScheduler.h>
+#include <KernelKit/Timer.h>
+
+// ================================================================= //
+
+namespace Kernel {
+struct HAL_HARDWARE_THREAD final {
+  HAL::StackFramePtr mFramePtr;
+  ProcessID          mThreadID{0};
+};
+
+STATIC HAL_HARDWARE_THREAD kHWThread[kMaxAPInsideSched] = {{nullptr}};
+
+namespace Detail {
+  STATIC BOOL kGICEnabled = NO;
+
+  /***********************************************************************************/
+  /// @brief Enables the GIC with EL0 configuration.
+  /// @internal
+  /***********************************************************************************/
+  STATIC Void mp_setup_gic_el0(Void) {
+    ke_dma_write<UInt32>(GICD_BASE, GICD_CTLR, YES);
+
+    UInt32 gicc_ctlr = ke_dma_read<UInt32>(GICC_BASE, GICC_CTLR);
+
+    const UInt8 kEnableSignalInt = 0x1;
+
+    gicc_ctlr |= kEnableSignalInt;
+    gicc_ctlr |= (kEnableSignalInt << 0x1);
+
+    ke_dma_write<UInt32>(GICC_BASE, GICC_CTLR, gicc_ctlr);
+
+    ke_dma_write<UInt32>(GICC_BASE, GICC_PMR, 0xFF);
+
+    UInt32 icfgr = ke_dma_read<UInt32>(GICD_BASE, GICD_ICFGR + (0x20 / 0x10) * 4);
+
+    icfgr |= (0x2 << ((32 % 16) * 2));
+
+    ke_dma_write<UInt32>(GICD_BASE, GICD_ICFGR + (0x20 / 0x10) * 4, icfgr);
+    ke_dma_write<UInt32>(GICD_BASE, GICD_ITARGETSR + (0x20 / 0x04) * 4, 0x2 << ((32 % 4) * 8));
+    ke_dma_write<UInt32>(GICD_BASE, GICD_IPRIORITYR + (0x20 / 0x04) * 4, 0xFF << ((32 % 4) * 8));
+    ke_dma_write<UInt32>(GICD_BASE, GICD_ISENABLER + 4, 0x01);
+  }
+
+  EXTERN_C BOOL mp_handle_gic_interrupt_el0(Void) {
+    UInt32 interrupt_id = ke_dma_read<UInt32>(GICC_BASE, GICC_IAR);
+
+    if ((interrupt_id & 0x3FF) < 1020) {
+      auto interrupt = interrupt_id & 0x3FF;
+
+      const UInt16 kInterruptScheduler = 0x20;
+
+      (Void)(kout << "SMP: AP: " << hex_number(interrupt) << kendl);
+
+      switch (interrupt) {
+        case kInterruptScheduler: {
+          ke_dma_write<UInt32>(GICC_BASE, GICC_EOIR, interrupt_id);
+          UserProcessHelper::StartScheduling();
+          break;
+        }
+        default: {
+          ke_dma_write<UInt32>(GICC_BASE, GICC_EOIR, interrupt_id);
+          break;
+        }
+      }
+
+      return YES;
+    }
+
+    return NO;
+  }
+}  // namespace Detail
+
+/***********************************************************************************/
+/// @brief Get current stack frame for a thread.
+/// @param thrdid The thread ID.
+/***********************************************************************************/
+
+EXTERN_C HAL::StackFramePtr mp_get_current_task(ProcessID thrdid) {
+  return kHWThread[thrdid].mFramePtr;
+}
+
+/***********************************************************************************/
+/// @brief Register current stack frame for a thread.
+/// @param stack_frame The current stack frame.
+/// @param thrdid The thread ID.
+/***********************************************************************************/
+
+EXTERN_C Bool mp_register_task(HAL::StackFramePtr stack_frame, ProcessID thrdid) {
+  MUST_PASS(Detail::kGICEnabled);
+
+  if (!stack_frame) return NO;
+  if (thrdid > kMaxAPInsideSched) return NO;
+
+  const auto process_index = thrdid;
+
+  kHWThread[process_index].mFramePtr = stack_frame;
+  kHWThread[process_index].mThreadID = thrdid;
+
+  return YES;
+}
+
+/***********************************************************************************/
+/// @brief Initialize the Global Interrupt Controller.
+/// @internal
+/***********************************************************************************/
+Void mp_init_cores(Void) {
+  if (!Detail::kGICEnabled) {
+    Detail::kGICEnabled = YES;
+    Detail::mp_setup_gic_el0();
+  }
+}
+}  // namespace Kernel
\ No newline at end of file