IDT Implemented, should be ready for entries.

git-svn-id: https://spexeah.com:8443/svn/Asuro@36 6dbc8c32-bb84-406f-8558-d1cf31a0ab0c

src/idt.pas

@@ -3,8 +3,8 @@ unit idt;
 interface
 
 uses
-    system,
-    types;
+    types,
+    util;
 
 type
     TIDT_Entry = bitpacked record
@@ -23,9 +23,34 @@ type
     PIDT_Pointer = ^TIDT_Pointer;
 
 var
-    IDT : Array [0..255] of TIDT_Entry;
+    IDT_Entries : Array [0..255] of TIDT_Entry;
     IDT_Pointer : TIDT_Pointer;
 
+procedure init();
+
 implementation
 
+procedure set_gate(Number : uint8; Base : uint32; Selector : uint16; Flags : uint8);
+begin
+    IDT_Entries[Number].base_high:= (Base and $FFFF0000) SHR 16;
+    IDT_Entries[Number].base_low:= (Base and $0000FFFF);
+    IDT_Entries[Number].selector:= Selector;
+    IDT_Entries[Number].flags:= Flags;
+    IDT_Entries[Number].always_0:= $00;
+end;
+
+procedure load(idt_pointer : uint32); assembler; nostackframe;
+asm
+    MOV EAX, idt_pointer
+    LIDT [EAX]
+end;
+
+procedure init();
+begin
+    IDT_Pointer.limit:= (sizeof(TIDT_Entry) * 256) - 1;
+    IDT_Pointer.base:= uint32(@IDT_Entries);
+    util.memset(uint32(@IDT_Entries), 0, sizeof(TIDT_Entry) * 256);
+    load(uint32(@IDT_Pointer));
+end;
+
 end.

src/kernel.pas

@@ -7,6 +7,7 @@ uses
      multiboot,
      util,
      gdt,
+     idt,
      console,
      bios_data_area,
      keyboard;
@@ -26,6 +27,7 @@ begin
      mbi:= mbinfo;
      mbm:= mbmagic;
      gdt.init();
+     idt.init();
      console.init();
      console.writestringln('Booting Asuro...');
      if (mbm <> MULTIBOOT_BOOTLOADER_MAGIC) then begin

src/util.pas

@@ -17,6 +17,7 @@ procedure halt_and_catch_fire();
 function inb(port : uint16) : uint8;
 function inw(port : uint16) : uint16;
 function inl(port : uint16) : uint32;
+procedure memset(location : uint32; value : uint8; size : uint32);
 
 implementation
 
@@ -121,4 +122,16 @@ begin
      end;
 end;
 
+procedure memset(location : uint32; value : uint8; size : uint32);
+var
+    loc : puint8;
+    i   : uint32;
+
+begin
+    for i:=0 to size do begin
+        loc:= puint8(location + i);
+        loc^:= value;
+    end;
+end;
+
 end.