Initial Commit.

git-svn-id: https://spexeah.com:8443/svn/Asuro@1 6dbc8c32-bb84-406f-8558-d1cf31a0ab0c

Compile.bat

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+@echo off
+set /a ERRCOUNT=0
+echo =======================
+echo == ASURO COMPILATION ==
+echo =======================
+echo.
+echo Compiling ASM Stub...
+echo.
+nasm -f elf src\stub.asm -o lib\stub.o
+if %ERRORLEVEL% GEQ 1 (
+	echo Failed to compile stub!
+	set /a ERRCOUNT=%ERRCOUNT%+1
+) ELSE (
+	echo Success.
+)
+echo.
+echo =======================
+echo.
+echo Compiling FPC Sources...
+echo.
+fpc -Aelf -n -O3 -Op3 -Si -Sc -Sg -Xd -CX -XXs -Rintel -Tlinux -FElib\ src\kernel.pas
+if %ERRORLEVEL% GEQ 1 (
+	echo Failed to compile FPC Sources!
+	set /a ERRCOUNT=%ERRCOUNT%+1
+) ELSE (
+	echo Success.
+)
+echo.
+echo =======================
+echo.
+echo Linking...
+echo.
+ld -A elf32-i386 --gc-sections -s -Tlinker.script -o bin\kernel.obj lib\stub.o lib\kernel.o lib\multiboot.o lib\system.o lib\console.o
+if %ERRORLEVEL% GEQ 1 (
+	echo Failed linking!
+	set /a ERRCOUNT=%ERRCOUNT%+1
+) ELSE (
+	echo Success.
+)
+echo.
+echo =======================
+echo.
+if %ERRCOUNT% GEQ 1 (
+	echo %ERRCOUNT% Errors Occurred, please review.
+) ELSE (
+	echo No errors. 
+)
+echo.
+echo =======================
+echo.
+echo Press any key to exit...
+pause > nul

linker.script

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+ENTRY(kstart)
+SECTIONS
+{
+  .text  0x100000 :
+  {
+    text = .; _text = .; __text = .;
+    *(.text)
+    . = ALIGN(4096);
+  }
+  .data  :
+  {
+    data = .; _data = .; __data = .;
+    *(.data)
+    kimage_text = .;
+    LONG(text);
+    kimage_data = .;
+    LONG(data);
+    kimage_bss = .;
+    LONG(bss);
+    kimage_end = .;
+    LONG(end);
+    . = ALIGN(4096);
+  }
+  .bss  :
+  {
+    bss = .; _bss = .; __bss = .;
+    *(.bss)
+    . = ALIGN(4096);
+  }
+  end = .; _end = .; __end = .;
+}

src/console.pas

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+{
+/////////////////////////////////////////////////////////
+//                                                     //
+//               Freepascal barebone OS                //
+//                       console.pas                   //
+//                                                     //
+/////////////////////////////////////////////////////////
+//
+//      By:             De Deyn Kim <[email protected]>
+//      License:        Public domain
+//
+}
+ 
+unit console;
+ 
+interface
+ 
+var
+        xpos: Integer = 0;
+        ypos: Integer = 0;
+ 
+procedure kclearscreen();
+procedure kwritechr(c: Char);
+procedure kwritestr(s: PChar);
+procedure kwriteint(i: Integer);
+procedure kwritedword(i: DWORD);
+ 
+implementation
+ 
+var
+        vidmem: PChar = PChar($b8000);
+ 
+procedure kclearscreen(); [public, alias: 'kclearscreen'];
+var
+        i: Integer;
+begin
+        for i := 0 to 3999 do
+                vidmem[i] := #0;
+end;
+ 
+procedure kwritechr(c: Char); [public, alias: 'kwritechr'];
+var
+        offset: Integer;
+begin
+        if (ypos > 24) then
+                ypos := 0;
+ 
+        if (xpos > 79) then
+                xpos := 0;
+ 
+        offset := (xpos shl 1) + (ypos * 160);
+        vidmem[offset] := c;
+        offset += 1;
+        vidmem[offset] := #7;
+        offset += 1;
+ 
+        xpos := (offset mod 160);
+        ypos := (offset - xpos) div 160;
+        xpos := xpos shr 1;
+end;
+ 
+procedure kwritestr(s: PChar); [public, alias: 'kwritestr'];
+var
+        offset, i: Integer;
+begin
+        if (ypos > 24) then
+                ypos := 0;
+ 
+        if (xpos > 79) then
+                xpos := 0;
+ 
+        offset := (xpos shl 1) + (ypos * 160);
+        i := 0;
+ 
+        while (s[i] <> Char($0)) do
+        begin
+                vidmem[offset] := s[i];
+                offset += 1;
+                vidmem[offset] := #7;
+                offset += 1;
+                i += 1;
+        end;
+ 
+        xpos := (offset mod 160);
+        ypos := (offset - xpos) div 160;
+        xpos := xpos shr 1;
+end;
+ 
+procedure kwriteint(i: Integer); [public, alias: 'kwriteint'];
+var
+        buffer: array [0..11] of Char;
+        str: PChar;
+        digit: DWORD;
+        minus: Boolean;
+begin
+        str := @buffer[11];
+        str^ := #0;
+ 
+        if (i < 0) then
+        begin
+                digit := -i;
+                minus := True;
+        end
+        else
+        begin
+                digit := i;
+                minus := False;
+        end;
+ 
+        repeat
+                Dec(str);
+                str^ := Char((digit mod 10) + Byte('0'));
+                digit := digit div 10;
+        until (digit = 0);
+ 
+        if (minus) then
+        begin
+                Dec(str);
+                str^ := '-';
+        end;
+ 
+        kwritestr(str);
+end;
+ 
+procedure kwritedword(i: DWORD); [public, alias: 'kwritedword'];
+var
+        buffer: array [0..11] of Char;
+        str: PChar;
+        digit: DWORD;
+begin
+        for digit := 0 to 10 do
+                buffer[digit] := '0';
+ 
+        str := @buffer[11];
+        str^ := #0;
+ 
+        digit := i;
+        repeat
+                Dec(str);
+                str^ := Char((digit mod 10) + Byte('0'));
+                digit := digit div 10;
+        until (digit = 0);
+ 
+        kwritestr(@Buffer[0]);
+end;
+ 
+end.

src/kernel.pas

@@ -0,0 +1,70 @@
+{
+/////////////////////////////////////////////////////////
+//                                                     //
+//               Freepascal barebone OS                //
+//                      kernel.pas                     //
+//                                                     //
+/////////////////////////////////////////////////////////
+//
+//      By:             De Deyn Kim <[email protected]>
+//      License:        Public domain
+//
+}
+ 
+unit kernel;
+ 
+interface
+ 
+uses
+        multiboot,
+        console;
+ 
+procedure kmain(mbinfo: Pmultiboot_info_t; mbmagic: DWORD); stdcall;
+ 
+implementation
+ 
+procedure kmain(mbinfo: Pmultiboot_info_t; mbmagic: DWORD); stdcall; [public, alias: 'kmain'];
+begin
+        kclearscreen();
+        kwritestr('Freepascal barebone OS booted!');
+        xpos := 0;
+        ypos += 1;
+ 
+        if (mbmagic <> MULTIBOOT_BOOTLOADER_MAGIC) then
+        begin
+                kwritestr('Halting system, a multiboot-compliant boot loader needed!');
+                asm
+                        cli
+                        hlt
+                end;
+        end
+        else
+        begin
+                kwritestr('Booted by a multiboot-compliant boot loader!');
+                xpos := 0;
+                ypos += 2;
+                kwritestr('Multiboot information:');
+                xpos := 0;
+                ypos += 2;
+                kwritestr('                       Lower memory  = ');
+                kwriteint(mbinfo^.mem_lower);
+                kwritestr('KB');
+                xpos := 0;
+                ypos += 1;
+                kwritestr('                       Higher memory = ');
+                kwriteint(mbinfo^.mem_upper);
+                kwritestr('KB');
+                xpos := 0;
+                ypos += 1;
+                kwritestr('                       Total memory  = ');
+                kwriteint(((mbinfo^.mem_upper + 1000) div 1024) +1);
+                kwritestr('MB');
+        end;
+ 
+        asm
+                @loop:
+                jmp @loop
+        end;
+end;
+ 
+end.

src/multiboot.pas

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+unit multiboot;
+ 
+interface
+ 
+const
+        KERNEL_STACKSIZE = $4000;
+ 
+        MULTIBOOT_BOOTLOADER_MAGIC = $2BADB002;
+ 
+type
+        Pelf_section_header_table_t = ^elf_section_header_table_t;
+        elf_section_header_table_t = packed record
+          num: DWORD;
+          size: DWORD;
+          addr: DWORD;
+          shndx: DWORD;
+        end;
+ 
+        Pmultiboot_info_t = ^multiboot_info_t;
+        multiboot_info_t = packed record
+          flags: DWORD;
+          mem_lower: DWORD; { Amount of memory available below 1mb }
+          mem_upper: DWORD; { Amount of memory available above 1mb }
+          boot_device: DWORD;
+          cmdline: DWORD;
+          mods_count: DWORD;
+          mods_addr: DWORD;
+          elf_sec: elf_section_header_table_t;
+          mmap_length: DWORD;
+          mmap_addr: DWORD;
+        end;
+ 
+        Pmodule_t = ^module_t;
+        module_t = packed record
+          mod_start: DWORD;
+          mod_end: DWORD;
+          name: DWORD;
+          reserved: DWORD;
+        end;
+ 
+        Pmemory_map_t = ^memory_map_t;
+        memory_map_t = packed record
+          size: DWORD;
+          { You can declare these two as a single qword if your compiler supports it }
+          base_addr_low: DWORD;
+          base_addr_high: DWORD;
+          { And again, these can be made into one qword variable. }
+          length_low: DWORD;
+          length_high: DWORD;
+          mtype: DWORD;
+        end;
+ 
+implementation
+ 
+end.

src/stub.asm

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+;/////////////////////////////////////////////////////////
+;//                                                     //
+;//               Freepascal barebone OS                //
+;//                      stub.asm                       //
+;//                                                     //
+;/////////////////////////////////////////////////////////
+;//
+;//     By:             De Deyn Kim <[email protected]>
+;//     License:        Public domain
+;//
+ 
+;
+; Kernel stub
+;
+ 
+;
+; We are in 32bits protected mode
+;
+[bits 32]
+ 
+;
+; Export entrypoint
+;
+[global kstart]
+ 
+;
+; Import kernel entrypoint
+;
+[extern kmain]
+ 
+;
+; Posible multiboot header flags
+;
+MULTIBOOT_MODULE_ALIGN          equ     1<<0
+MULTIBOOT_MEMORY_MAP            equ     1<<1
+MULTIBOOT_GRAPHICS_FIELDS       equ     1<<2
+MULTIBOOT_ADDRESS_FIELDS        equ     1<<16
+ 
+;
+; Multiboot header defines
+;
+MULTIBOOT_HEADER_MAGIC          equ     0x1BADB002
+MULTIBOOT_HEADER_FLAGS          equ     MULTIBOOT_MODULE_ALIGN | MULTIBOOT_MEMORY_MAP
+MULTIBOOT_HEADER_CHECKSUM       equ     -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
+ 
+;
+; Kernel stack size
+;
+KERNEL_STACKSIZE                equ     0x4000
+ 
+section .text
+ 
+;
+; Multiboot header
+;
+align 4
+dd MULTIBOOT_HEADER_MAGIC
+dd MULTIBOOT_HEADER_FLAGS
+dd MULTIBOOT_HEADER_CHECKSUM
+ 
+;
+; Entrypoint
+;
+kstart:
+        mov esp, KERNEL_STACK+KERNEL_STACKSIZE  ;Create kernel stack
+        push eax                                ;Multiboot magic number
+        push ebx                                ;Multiboot info
+        call kmain                              ;Call kernel entrypoint
+        cli                                     ;Clear interrupts
+        hlt                                     ;Halt machine
+ 
+section .bss
+ 
+;
+; Kernel stack location
+;
+align 32
+KERNEL_STACK:
+        resb KERNEL_STACKSIZE