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

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

1 files changed, 44 insertions, 0 deletions

diff --git a/src/kernel/HALKit/POWER/HalVirtualMemory.cpp b/src/kernel/HALKit/POWER/HalVirtualMemory.cpp
new file mode 100644
index 00000000..0c954f29
--- /dev/null
+++ b/src/kernel/HALKit/POWER/HalVirtualMemory.cpp
@@ -0,0 +1,44 @@
+// 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 <HALKit/POWER/MMU.h>
+#include <HALKit/POWER/Processor.h>
+#include <KernelKit/DebugOutput.h>
+
+/// @note Refer to SoC documentation.
+
+using namespace Kernel;
+
+EXTERN_C Void hal_write_tlb(UInt32 mas0, UInt32 mas1, UInt32 mas2, UInt32 mas3, UInt32 mas7) {
+  hal_mtspr(MAS0, mas0);
+  hal_mtspr(MAS1, mas1);
+  hal_mtspr(MAS2, mas2);
+  hal_mtspr(MAS3, mas3);
+  hal_mtspr(MAS7, mas7);
+
+  hal_flush_tlb();
+}
+
+EXTERN_C Bool hal_set_tlb(UInt8 tlb, UInt32 epn, UInt64 rpn, UInt8 perms, UInt8 wimge, UInt8 ts,
+                          UInt8 esel, UInt8 tsize, UInt8 iprot) {
+  if ((hal_mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1 && (tsize & 1)) {
+    // this MMU does not allow odd tsize values
+    return false;
+  }
+
+  UInt32 mas0 = FSL_BOOKE_MAS0(tlb, esel, 0);
+  UInt32 mas1 = FSL_BOOKE_MAS1(1, iprot, 0, ts, tsize);
+  UInt32 mas2 = FSL_BOOKE_MAS2(epn, wimge);
+  UInt32 mas3 = FSL_BOOKE_MAS3(rpn, 0, perms);
+  UInt32 mas7 = FSL_BOOKE_MAS7(rpn);
+
+  hal_write_tlb(mas0, mas1, mas2, mas3, mas7);
+
+  return true;
+}
+
+/// @brief Flush TLB
+EXTERN_C void hal_flush_tlb() {
+  asm volatile("isync;tlbwe;msync;isync");
+}