nasm - Develop a Bootloader In Assembly -

-

I have already made a part of my OS in the assembly, but now I will replace it with my own bootloader About to use GRUB When I was developing my test OS in the assembly, I remember that I boot it like this: 

  org 0x7c00 bits 16; OS kernel here times 510 - ($ - $$) db 0 dw 0xAA55

This is already known to me. Now I want to use it and want to execute the "real" OS which will be the * .bin file written to the second sector of the floppy.

  • I need to add anything
  • I want to know something

    • What will start on the second sector of floppy, execution How can I do a bootloader in the assembly? For the assembly source which will be placed on the second sector of the floppy? int 0x13

      To load the number of expected numbers, Code> and go to the place that you have placed the new code. In the second step you do not have to do anything, but you want to make sure that you are valid ds to load the code.

      Example small OS archive: 

        / * Boos areas es: bx * / pushw $ STAGE1_WORKSEG popw% es movw $ STAGE1_OFFSET,% bx read_stage1: / * Try reading in areas * / Movb $ 0x2,% cl / * sector * / movb $ 0x0,% ch / * cylinder * / movb $ 0x0,% dh / * head * / movb $ 0x0,% dl / * drive * / Movb $ 0x2,% ah / * reads the BIOS function / / * How many sectors to load * / movb $ STAGE1_SIZE,% al int $ 0x13 jnc read_stage1_done / * reset drive * / xorw% ax,% ax int $ 0x13 jmp read_stage1 read_stage1_done: / * perform a long leap in step 1 * / ljmp $ STAGE1_WORKSEG, stop the $ STAGE1_OFFSET call To:: * * Function: Prevent * Summary: Sends the processor to a permanent deferred image S * Notes: * Reboot manually * / hlt / * Stop the processor * / jmp halt

      This gas is in the form so you want to reverse the operation order because it seems that you are using NASM with the bar instructions, the variable name should be self explanatory.

      If you are developing a hobby OS then it is a good place to get support from http://forum.osdev.org/ Others are doing the same thing It's a bit more specific than the stack overflow, and many OS stuff can be quite confusing.


    • Comments

    Post a Comment

    Popular posts from this blog

    php - multilevel menu with multilevel array -

    -
    Just ask someone to solve this problem? I want to create a multilevel menu I can not find the right solution generated with multilevel array, it always gets an array_push error My study came from the original idea But still my Can not match the need. This is my MySQL [code] ----- --------------------- --------------- | ID | PARENT_ID | Name | Link | Seq | 1 | 0 | Dashboad | Dashboard / | 1 | 2 | 0 | Menu 1 | Menu 1 / | 2 | 3 | 0 | Menu 2 | Menu 2 / | 3 | 4 | 0 | Menu 3 | Menu 3 / | 4 | 5 | 2 | Joint Add / | 1 | 6 | 3 | Joint Add / | 1 | 7 | 2 | Edit | Edit / | 2 | 8 | 4 | Joint Add / | 1 ------------------------------------------ [/ Code] I want to do something like this in my array array ('dashboard' = & gt; array ('id' = & gt; '' 'Dame' = & gt; 'Dashboard', 'Title' = & gt; 'Dashboard', 'MatchMin' = & gt; Base_URL (). 'Dashboard /', 'Active' => = & Gt; NULL), ...
    Read more

    c# - TypeConverter in propertygrid only converts from string, not to -

    -
    When the property grid is reached, only the conversion mechanism (often called) is called "Foo!" Returns the property string in the grid when I click to edit I get an exception Type.oo. Object type can not be changed to type. (Not properly translated,) What is a clue from the convert format, why not? And the error indicates that it is trying to convert to a string, not from. I think that when I want to edit this object, it will have to be converted from foo to string, and when the editing ends. Public class FooTypeConverter: StringConverter {public override object ConvertFrom (ITypeDescriptorContext Reference, CultureInfo Culture, Object Value) {New Foo (string) value); } Convert the public override object (Type the ITE DiskText Contact Reference, CultureInfo Culture, Object Value, Type Type) {Return "Foo!"; } Public override bool CanConvertFrom (ITypeDescriptorContext reference, type source type) {back true; } Public Override Bull CanConvertTo (ITypeDescrip...
    Read more

    jQuery UI: Datepicker month format -

    -
    I am trying to change the format of the month that shows in the popup (not in the date that the picker actually I do not have any choice anywhere to do this, do I like to use a sub-string () or something else? What I normally display is Trying to change: Class = "ui-datepicker-title"> January & lt; / span & gt; ... & lt; / div & gt; Div>
    Read more