1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/arch/i386/gdt2.cpp b/kernel/arch/i386/gdt2.cpp
new file mode 100644
index 0000000..0acdb0e
--- /dev/null
+++ b/kernel/arch/i386/gdt2.cpp
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdint.h>
+/*
+// structure to be encoded at encodeGdtEntry()
+struct GDT
+{
+    uint32_t base;
+    uint32_t limit;
+    uint8_t access_byte;
+    uint8_t flags;
+};
+
+GDT strnulldesc {0, 0, 0, 0};
+GDT strkernelcode {0, 0xFFFFF, 0x9A, 0xC};
+GDT strkerneldata {0, 0xFFFFF, 0x92, 0xC};
+GDT strusercode {0, 0xFFFFF, 0xFA, 0xC};
+GDT struserdata {0, 0xFFFFF, 0xF2, 0xC};
+
+uint8_t* nulldesc;
+uint8_t* kernelcode;
+uint8_t* kerneldata;
+uint8_t* usercode;
+uint8_t* userdata;
+
+
+void encodeGdtEntry(uint8_t *target, struct GDT source)
+{
+    // Check the limit to make sure that it can be encoded
+    if (source.limit > 0xFFFFF) {printf("GDT cannot encode limits larger than 0xFFFFF\n");}
+ 
+    // Encode the limit
+    target[0] = source.limit & 0xFF;
+    target[1] = (source.limit >> 8) & 0xFF;
+    target[6] = (source.limit >> 16) & 0x0F;
+ 
+    // Encode the base
+    target[2] = source.base & 0xFF;
+    target[3] = (source.base >> 8) & 0xFF;
+    target[4] = (source.base >> 16) & 0xFF;
+    target[7] = (source.base >> 24) & 0xFF;
+ 
+    // Encode the access byte
+    target[5] = source.access_byte;
+ 
+    // Encode the flags
+    target[6] |= (source.flags << 4);
+}
+
+extern "C" void setupGdt() {
+
+} */
+\ No newline at end of file