1 files changed, 54 insertions, 0 deletions
diff --git a/Kernel/HALKit/POWER/HalVirtualMemory.cxx b/Kernel/HALKit/POWER/HalVirtualMemory.cxx
new file mode 100644
index 00000000..c77c5b4d
--- /dev/null
+++ b/Kernel/HALKit/POWER/HalVirtualMemory.cxx
@@ -0,0 +1,54 @@
+/* -------------------------------------------
+
+    Copyright SoftwareLabs
+
+------------------------------------------- */
+
+#include <HALKit/POWER/ppc-cpu.h>
+#include <HALKit/POWER/ppc-mmu.h>
+
+#include <HALKit/POWER/Processor.hpp>
+#include <KernelKit/DebugOutput.hpp>
+
+/// @note refer to our SoC documentation.
+
+using namespace NewOS;
+
+/// @brief Write directly to the specific TLB.
+/// @param mas0
+/// @param mas1
+/// @param mas2
+/// @param mas3
+/// @param mas7
+static void hal_write_tlb(uint32_t mas0, uint32_t mas1, uint32_t mas2, uint32_t mas3, uint32_t mas7)
+{
+	mtspr(MAS0, mas0);
+	mtspr(MAS1, mas1);
+	mtspr(MAS2, mas2);
+	mtspr(MAS3, mas3);
+	mtspr(MAS7, mas7);
+
+	hal_flush_tlb();
+}
+
+void hal_set_tlb(uint8_t tlb, uint32_t epn, uint64_t rpn, uint8_t perms, uint8_t wimge, uint8_t ts, uint8_t esel, uint8_t tsize, uint8_t iprot)
+{
+	if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1 && (tsize & 1))
+	{
+		// this mmu-version does not allow odd tsize values
+		return;
+	}
+	uint32_t mas0 = FSL_BOOKE_MAS0(tlb, esel, 0);
+	uint32_t mas1 = FSL_BOOKE_MAS1(1, iprot, 0, ts, tsize);
+	uint32_t mas2 = FSL_BOOKE_MAS2(epn, wimge);
+	uint32_t mas3 = FSL_BOOKE_MAS3(rpn, 0, perms);
+	uint32_t mas7 = FSL_BOOKE_MAS7(rpn);
+
+	hal_write_tlb(mas0, mas1, mas2, mas3, mas7);
+}
+
+/// @brief Flush system TLB.
+EXTERN_C void hal_flush_tlb()
+{
+	asm volatile("isync;tlbwe;msync;isync");
+}