Look at xv6 code and it's commentary. The bootloader for xv6 is a 2 stage boot loader and is pretty simple. It does not support advanced features like chain loading and stuff.
The EFI partition is what is used to store bootloaders in modern UEFI machines. UEFI is a modern version of BIOS on steroids but it is backwards compatible. The xv6 bootloader would work on UEFI machines as well. Just understand how it works first and you can ask doubts here if you face any problems
but what is the offset of that 1-62 sector
/
MuchubaTactics
Any qt devs?
Ighor
Dm
launch: program 'enter program name, for example C:\Users\Wilson OneDrive\Documents\C++\a.exe' does not exist
Just check you address
Check
C:\Users\Wilson OneDrive\Documents\C++\a.exe
John
Okay thanks
/
Help
yas$dev
/
```mov si, bstr
call print
jmp $
print:
mov ah, 0xe
mov bh, 0x0
lodsb ;tried also mov al, [si]
int 0x10
ret
times 510-($-$$)db 0
dw 0xaa55
bstr db "test"```
/
what
if i move the char using mov al, 't' it works but if i move it using the address it shows nothing
/
i have tried changing the position mov si, bstr
call print
jmp $
bstr db "test"
print:
mov ah, 0xe
;mov bh, 0x0
mov al, [si]
int 0x10
ret
times 510-($-$$)db 0
dw 0xaa55
/
but now it show an S why it shows an S
alessandro
does someone knows csv parser doesn't use like vector structure....
/
i have solved it by adding org at the beginning
/
now i want to place that code in the usb to be runned by the computer
/
i have also tried to repleace the mbr boot code with that one
/
using an hex editor
/
but i dont know if i am doing it right
/
Help i have tried opening the usb in an hex editor and there is Physical drive and logical drive
/
at the start of which is the MBR
/
it is different
/
at the start of the physical i can see strings like "cannot find the operating system"
/
and before it there are bytes that seems like machine code
/
It worked i have booted the usb and printed a string
/
modifying the first bytes of the physical drive
/
i am not creating an OS
/
i wanted to make a usb that shows something
/
i boot the usb and shows the text
/
i have already done it
/
but do you know if there is another way to print text without using interrupts
/
because on a website was written that they are slow
/
and its better to interact with the graphic card
Anonymous
Help:
I need the user to be able to input a large number of characters ( this is why 'char' is not suitable, it limits characters to 256 ) and I want the user to be able to use new lines.
What type should i declare now(in C)?
Deepak Chaurasia
%[^\n] Array
klimi
Deepak Chaurasia
I haven't seen "%[^\n]" data type before
It used for input till a new line
Deepak Chaurasia
https://stackoverflow.com/questions/39431924/what-does-n-mean-in-c
Anonymous
Unicode is just series of bytes, it should work just fine tho
I can't put more than one letter,debugger says overflow.
klimi
Oh god, this... Use char array
Deepak Chaurasia
char a[100000]
klimi
Or if you can use gnu extension just use get line
Anonymous
Or if you can use gnu extension just use get line
Syntax please,you're talking to an absolute novice here.
klimi
Syntax please,you're talking to an absolute novice here.
You want syntax? Just look to the C language draft
klimi
Otherwise
klimi
#howtoask
klimi
it's best way to create underperfom program
Not the best, he could add one more zero :D (jk)
alessandro
so i want load more data by files and i need a lot space to elaborate that
klimi
I think you can do something like %20[] to limit it
klimi
You are using C only?
klimi
Then you can use the standard library
alessandro
yep
alessandro
wait, is there tree implementation in stl?
/
what do you mean
alessandro
hash map
/
can you make an example code that draws a line for example
klimi
what do you mean
0xb80000 is the VGA buffer which you can use to display text onto the screen in real mode, if you want to print onto the screen, you can use that. You could also just ask the bios to draw it for you but I think you have written you don't want that
klimi
can you make an example code that draws a line for example
Its text only AFAIK, look onto the osdev wiki
/
0xb80000 is the VGA buffer which you can use to display text onto the screen in real mode, if you want to print onto the screen, you can use that. You could also just ask the bios to draw it for you but I think you have written you don't want that
so to draw a text on the screen i place charters at that address or what
alessandro
thx
klimi
so to draw a text on the screen i place charters at that address or what
Have you really checked the osdev wiki? https://wiki.osdev.org/Bare_Bones
klimi
and how can i write to that address
You write into google "cppreference std::unordered_map"