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> OS Construction > FreePascal and OS Creation? |
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bogdanontanu 07 Jun 2004, 14:52
Shouldn't you have posted in the OS Construction related forum and not in main?
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07 Jun 2004, 14:52 |
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bogdanontanu 07 Jun 2004, 14:58
Yes maybe Pascal has this option, also C/C++ has it ... so what?
ASM is used in OS because there are some things that are harder to do in HLL languages... like setiing protected mode (GDT and LIDT setup, selectors, paging and multitasking. If you do not like ASM you do not have to use it for the whole OS, you can make only the needed parts in ASM and then continue into your preffered HLL language (c/Pascal/whatever) HLL have a tenedency to hide information from the programmer...and this might be an obstacle in OS coding, but IF you really understand what you are doing, you could use HLL |
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07 Jun 2004, 14:58 |
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Embrance 07 Jun 2004, 15:30
Well,i have in mind the things you said.I was thinking make some include files like Emu8086's one to have some basic function/commands like "PRINT" etc sow i would need any pascal,c or whatever.
Im just new to ASM and i need help to make something like this.By doing this you save time.Heres an example: You want to make a prgram and print some text. You need to use DB commands and lots of stuff like this. Why just dont type PRINT and then the text you want? YOU save lots of time!Especially on BIG projects like OS development! |
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07 Jun 2004, 15:30 |
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crc 07 Jun 2004, 18:17
Embrance wrote: You want to make a prgram and print some text. Just write macros! There's no need to use a HLL for functionality like this. And believe me, you won't save much (if any) time by starting with an HLL and exporting to assembly. |
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07 Jun 2004, 18:17 |
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bogdanontanu 07 Jun 2004, 18:22
I use macros like this:
ODS1_fmt <" DX=%i, DY=%i = %s ">,[one_bmp_dx],[one_bmp_dy],<offset sz_filename_bmp> ODS <"here is my message"> besides you still have to type the message 
as crc say the path you are seeing in your mind is much more complicated than this simple macros... besides what difference is typing a "db" going to do? Sometimes i think to algorithms for days or hours... so... Besides how many big/huge projects have you done already and realized ... from you own experience... not from plain thinking ahead in your mind... that not typing DB is the issue in a huge project? Last edited by bogdanontanu on 07 Jun 2004, 18:41; edited 2 times in total |
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07 Jun 2004, 18:22 |
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ShortCoder 07 Jun 2004, 18:30
Print what to where though? If there is a concept of a console, then that question is answered simply enough, but if you are making your own OS, there won't be a console unless you make one yourself. That being said, you're most likely going to have to create your own printing routine. You're going to have to create your own fonts (or else be satisfied with having everything in text mode, in which case there will be supplied a system/OEM font built-in to the video BIOS that you will be using, and it will also take care of the "print to where" question. However, you will NOT be able to use any graphics whatsoever if you choose to do that (well, you'll have to switch into graphics mode, but then you won't have that font anymore and won't be able to treat the screen as a console anymore)). You could also do something like research the TrueType fonts format, for example, and then use premade fonts (you'll still have to code your own font rendering-engine though) but realize there are patent/copyright issues there and if you don't want to mess with that, better to just make your own.
Next, you will have to have some concept of a console or window in which to print in your mind and you will have to first render that on screen and then render the pixels to areas, starting from left to right (you could go any way, really, but I just find left to right most logical), and then plot pixels. You receive the pixels from your font rendering-engine. (Pass in a string, receive an array of pixels;)) _________________ Boycott Symantec/Norton/PowerQuest whenever possible |
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07 Jun 2004, 18:30 |
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Gambino 09 Jun 2004, 06:09
Quote: (well, you'll have to switch into graphics mode, but then you won't have that font anymore and won't be able to treat the screen as a console anymore). That's not true! I programmed VESA and the standard BIOS font works both in TEXT modes and GRAPHIC modes. And with a little tweaking of the VGA registers you can create your own BIOS-like font very easily, and you can load it from a file and still works in TEXT modes and GRAPHIC modes. A console enviroment it's easily coded...not a big deal A GUI it's hard to code...because of the diffrents color depths and resolutions and you need to code software rendering primitives like lines,circles etc. and then create buttons,windows etc. I think that Bogdan Ontanu has worked very hard on his GUI of Solar OS and that's a big deal 
Keep the good work going... 
Traiasca Romanii  |
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09 Jun 2004, 06:09 |
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Embrance 09 Jun 2004, 21:04
Well my main thought are macros.How to create them?How they owrk?
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09 Jun 2004, 21:04 |
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bogdanontanu 10 Jun 2004, 00:41
asically the assembler replaces the macro body for each macro instance at compile time...
A single line of a macro is expanded into multiple lines of code and calculations/ opertaions are also done at expansion time... Somehow similar to what a HLL compiler does ... but more limited ... and also much more under your control Using macros you can somehow redefine the ASM language to look much more like an HLL. However they slowdown assemble/compile time and somehow hide what is really happening... but once you know what they are exactly doing and get experienced with macros, they can save a lot of typo and time... and unlike a HLL they are still under your control For example: Code: ;--------------------------------------- ; define and output a formated string ;--------------------------------------- ODS_fmt MACRO mfmt1, marglist1 :VARARG LOCAL mstring1 .data mstring1 db mfmt1 db 0 .code pushad call wsprintfA,offset sz_val1,offset mstring1, marglist1 Call OutputDebugStringA,offset sz_val1 popad ENDM Each time i call the macro like this: ODS_fmt <"This is my counter:%i">,[my_counter] The assembler replaces it with above lines. But because mstring1 is a LOCAL variable to the macro it gets a different name everytime, something like ??_C0001, ??_C002 etc etc .. also sz_val1 is defined elsewhere as a global string variable used for trash Well this is TASM macro syntax, and FASM might be different... but the concepts are the same _________________ "Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction." |
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10 Jun 2004, 00:41 |
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ShortCoder 10 Jun 2004, 01:10
Gambino wrote:
Then I apologize as I was not aware of this. Does this work on standard VGA monitors too or only with SVGA? _________________ Boycott Symantec/Norton/PowerQuest whenever possible |
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10 Jun 2004, 01:10 |
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bogdanontanu 10 Jun 2004, 02:05
It works with BIOS functions only .. so only in real mode, in protected mode you are on your own... but yes in real mode after a switch to GFX mode most BIOS and video cards are still able to draw a text message using internal font
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10 Jun 2004, 02:05 |
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Gambino 07 Jul 2004, 00:17
Quote: Then I apologize as I was not aware of this. Does this work on standard VGA monitors too or only with SVGA? The monitors has nothing to do with fonts and graphics... The monitor only displays what the video card tell them 
What's the diffrence between VGA and SVGA monitors 
The diffrence is only that SVGA monitors support higher resolutions and refresh rates...  |
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07 Jul 2004, 00:17 |
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Embrance 08 Jul 2004, 20:58
Does anyone know any OS (examples or complete working) that are made in Pascal?
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08 Jul 2004, 20:58 |
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zenek_tm 08 Jul 2004, 21:28
I found some time ago OS in development written using FPC and NASM. Didn't try it, but some sources were available. Here's the URL http://stormdos.sourceforge.net/.
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08 Jul 2004, 21:28 |
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crc 08 Jul 2004, 21:30
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08 Jul 2004, 21:30 |
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Embrance 08 Jul 2004, 22:55
OK.Gonna check them!
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08 Jul 2004, 22:55 |
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