Help to get my bootloader to load my kernel??

[TheVillageIdiot]

[attachment deleted by admin]

[TheVillageIdiot]

Hail again,

OK i know its only been 2 hours, but it feels like bloody ages. hehehe.

I've made some changes:

In the file MakeKernel.bat the line that reads:
ld -Ttext 0xFF800000 --oformat binary -o kernel.bin kernel.o kernel_c.o

Has been changed to:
ld -Ttext 0x00001000 --oformat binary -o kernel.bin kernel.o kernel_c.o

That's to tell my compiler where to expect the kernel to be. Since i was asking my bootloader to load it at 0x1000 then i must tell my kernel compiler the same. :P

Anyways, i'm gonna keep at it. Talk to yous later i suppose. :)

Regards,

----------------------
TheVillageIdiot

[Tom]

Well, try testing the code without Bochs.

[TheVillageIdiot]

Hey,

Thanks for your post Tom.
I tried it, and it still ain't working. There's got to be some little thing wrong that i just can't see.

Oh well.....Into the breach dear friends.....

----------------------
TheVillageIdiot

[TheVillageIdiot]

Hey again,

Hmmm......still no luck.

Anyways its 2am so i'm going to bed. I'll sleep on it and see how i go tommorrow.

Regards,

----------------------
TheVillageIdiot

[.bdjames]

1) You are not compiling your kernel
2) You are not linking to your kernel

NASM -o stub.o -f coff kernel.asm
GCC -O2 -fomit-frame-pointer -c -o kernel.o kernel_c.c
ld --oformat=binary --entry=start --Ttext=0x1000 --output kernel.bin stub.o kernel.o

I suggest using gas and makefiles for your kernel:

.code32
.global start

start: jmp _c_main

[Pype.Clicker]

using gas ?? gasp!

[Whatever5k]

I wouldn't use GAS either...the syntax is so complicated...
Rather use Nasm

[grey wolf]

i can use the more familiar syntax if you add this line to the top of your .S files:

.intel_suntax no_prefix

then no more % before the register name, and no more source before destination. nice, clean Intel Syntax.

(BTW, GAS's syntax is called AT&T syntax)

[.bdjames]

I did not like gcc/gas until I read about extended inline
assembly. It is so much better than any other combination.

Yes AT&T is ugly and gas is buggy, but I like keeping it
simple:one assembler, one compiler, one linker.

[dronkit]

it makes more sense to me to write:

Code: Select all

movl $0xF, %eax 

to load 0xFh in eax than

Code: Select all

mov eax, 0Fh

and why is gas buggy?

I think this is all a matter of personal taste. Like using masm or tasm or a86 or whatever.

(but if you use gas you can use gdb easier)

[.bdjames]

Try using unreal mode in gas

[dronkit]

that's because gas was not intended to be used to write 16 bits applications...

[svempa]

When you are setting up your stack.

....................................
cli
mov ax,0x9000
mov ss,ax
mov sp,0xFFFF
;<--- sti is missing right? So that you can print the message through int 10h
mov si, BootMsg
call PrintStr
....................................

[Tom]

why did you bring up such a old message?