Virtual Memory Management fucking works!

git-svn-id: https://spexeah.com:8443/svn/Asuro@125 6dbc8c32-bb84-406f-8558-d1cf31a0ab0c

src/kernel.pas

@@ -14,8 +14,8 @@ uses
      bios_data_area,
      keyboard,
      vmemorymanager,
-     pmemorymanager,
-     scheduler;
+     pmemorymanager;
+     //scheduler;
  
 procedure kmain(mbinfo: Pmultiboot_info_t; mbmagic: uint32); stdcall;
  
@@ -53,7 +53,13 @@ begin
      irq.init();
      pmemorymanager.init();
      vmemorymanager.init();
-     scheduler.init();
+
+     vmemorymanager.new_page(0);
+     pint:= puint32(0);
+     console.writestringln('Writing 1234 to Logical Address $00000000');
+     pint^:= 1234;
+     if pint^ = 1234 then console.writestringln('Read 1234 back from Logical Address $00000000!!!');
+     //scheduler.init();
 
      STI;
      isr32.hook(uint32(@bios_data_area.tick_update));

src/pmemorymanager.pas

@@ -14,8 +14,8 @@ type
     TPhysicalMemory = array[0..1023] of TPhysicalMemoryEntry;
 
 procedure init;
-function newblock(caller : uint32) : uint16;
-procedure freeblock(block : uint16; caller : uint32);
+function new_block(caller : uint32) : uint16;
+procedure free_block(block : uint16; caller : uint32);
 
 implementation
 
@@ -24,6 +24,7 @@ var
 
 procedure init;
 begin
+    console.writestringln('PMM: INIT BEGIN.');
     with PhysicalMemory[0] do begin
         Present:= True;
         MappedTo:= 0;
@@ -32,25 +33,33 @@ begin
         Present:= True;
         MappedTo:= 0;
     end;
+    console.writestringln('PMM: INIT END.');
 end;
 
-function newblock(caller : uint32) : uint16;
+function new_block(caller : uint32) : uint16;
 var
     i : uint16;
 
 begin
-    newblock:= 0;
+    new_block:= 0;
     for i:=2 to 1023 do begin
         if not PhysicalMemory[i].Present then begin
             PhysicalMemory[i].Present:= True;
             PhysicalMemory[i].MappedTo:= caller;
-            newblock:= i;
+            new_block:= i;
+            console.writestring('4MiB Block Added @ ');
+            console.writeword(i);
+            console.writestring(' [');
+            console.writeword(i SHL 22);
+            console.writestring(' - ');
+            console.writeword((i+1 SHL 22)-1);
+            console.writestringln(']');
             exit;
         end;
     end; 
 end;
 
-procedure freeblock(block : uint16; caller : uint32);
+procedure free_block(block : uint16; caller : uint32);
 begin
     if block > 1023 then begin
         GPF;
@@ -60,7 +69,7 @@ begin
         GPF;
         exit;
     end;
-    if PhysicalMemory[block].caller <> caller then begin
+    if PhysicalMemory[block].MappedTo <> caller then begin
         GPF;
         exit;
     end;

src/scheduler.pas

@@ -5,7 +5,7 @@ interface
 uses
     console,
     isr32,
-    pmemorymanager;
+    lmemorymanager;
 
 const
     Quantum = 64;

src/vmemorymanager.pas

@@ -33,6 +33,7 @@ procedure init;
 function new_page(page_number : uint16) : boolean;
 function new_page_at_address(address : uint32) : boolean;
 procedure free_page(page_number : uint16);
+procedure free_page_at_address(address : uint32);
 
 implementation
 
@@ -63,20 +64,42 @@ function new_page(page_number : uint16) : boolean;
 var
     block : uint16;
     page  : uint16;
+    rldpd : uint32;
 
 begin
     new_page:= false;
-    if PageDirectory^[block].Present then exit;
-    if PageDirectory^[block].Reserved then exit;
-    block:= pmemorymanager.newblock(uint32(PageDirectory));
+    if PageDirectory^[page_number].Present then exit;
+    if PageDirectory^[page_number].Reserved then exit;
+    block:= pmemorymanager.new_block(uint32(PageDirectory));
     if block < 2 then begin
         GPF;
         exit;
     end else begin
-        PageDirectory^[block].Present:= true;
-        PageDirectory^[block].Address:= block;
-        PageDirectory^[block].PageSize:= true;
+        PageDirectory^[page_number].Present:= true;
+        PageDirectory^[page_number].Address:= block;
+        PageDirectory^[page_number].PageSize:= true;
+        rldpd:= uint32(PageDirectory) - KERNEL_VIRTUAL_BASE;
+        asm
+            mov eax, rldpd
+            mov CR3, eax
+        end;
         new_page:= true;
+        console.writestringln('New Page Added:');
+
+        console.writestring('- P:');
+        console.writeword(page_number);
+        console.writestring('-->B:');
+        console.writewordln(block);
+        
+        console.writestring('- P:[');
+        console.writeword(page_number SHL 22);
+        console.writestring(' - ');
+        console.writeword((page_number+1 SHL 22) - 1);
+        console.writestring(']-->B:[');
+        console.writeword(block SHL 22);
+        console.writestring(' - ');
+        console.writeword((block+1 SHL 22) - 1);
+        console.writestringln(']');
     end;
 end;
 
@@ -90,17 +113,22 @@ begin
 end;
 
 procedure free_page(page_number : uint16);
+var
+    block : uint16;
+
 begin
     if PageDirectory^[page_number].Present then begin
+        block:= PageDirectory^[page_number].Address;
         asm
             invlpg [page_number]
-        end;    
+        end;
+        pmemorymanager.free_block(block, uint32(PageDirectory));
     end else begin
         GPF;
     end;
 end;
 
-function free_page_at_address(address : uint32);
+procedure free_page_at_address(address : uint32);
 var
     page_number : uint16;