Forum: Assembly  Feb 6th, 2008 |
| Replies: 3 Views: 1,837 Re: Fibonacci sequence
yea one more register like for instance dx where it will be now
add eax, ebx
add edx,eax ; now write a code that writes using ax, then dx b4 returning
add ebx, eax |
| Forum: Assembly Feb 6th, 2008 |
| Replies: 3 Views: 1,837 Re: Fibonacci sequence
the code you wrote is not for such a sequence, try and calculate manually and you'll see, u must write another code. try adding one more register. whats with the numbers anyway? |
| Forum: Assembly Jan 8th, 2008 |
| Replies: 1 Views: 598 |
| Forum: Assembly Jan 8th, 2008 |
| Replies: 3 Views: 1,379 |
| Forum: Assembly Jan 8th, 2008 |
| Replies: 1 Views: 598  Protected To Real Mode Error
heya why is it that wen i switch back to real mode i cant access real mode interrupts even when i never modified anythang like for instance this code
mov EAX,CR0
OR AL,0H
MOV CR0,EAX;THEN SWITCH BACK... |
| Forum: Assembly Jan 8th, 2008 |
| Replies: 3 Views: 1,379 Re: protected mode programming guide
heya why is it that wen i switch back to real mode i cant access real mode interrupts even when i never modified anythang like for instance this code
mov EAX,CR0
OR AL,0H
MOV CR0,EAX;THEN SWITCH BACK... |
| Forum: Assembly Dec 5th, 2007 |
| Replies: 6 Views: 1,623 |
| Forum: Assembly Dec 4th, 2007 |
| Replies: 6 Views: 1,623 Re: protected mode
i know cs is for the selector but it doesnt select the right selector at all, what memory should i put at GDTR 00007c00h+gdtr or what? |
| Forum: Assembly Dec 2nd, 2007 |
| Replies: 6 Views: 1,623 protected mode
Now i have been able to create the gdt's and when i change to pmode, will a short JMP flush the instruciton prefetch queue? here is a sample of my code and the gdt and gdtr content,
mov... |
| Forum: Assembly Nov 11th, 2007 |
| Replies: 3 Views: 1,379 protected mode programming guide
Anyone to help with protected mode programming,like help me create a a data descriptor pointing to 0b800h when i try to write to RAM it rebbots |
| Forum: Assembly Nov 1st, 2007 |
| Replies: 1 Views: 734 Protected mode reboots
Why does my computer reboot after i set PE bit of cr0 or run lmsw? I have set all the code and data segments |
| Forum: Assembly Nov 1st, 2007 |
| Replies: 9 Views: 1,708 Re: Sgdt,lgdt,ligdt,
Hey people i got it, its lgdt [ds: (ofset) ] thank u guys and God bless u. Praise be to God |
| Forum: Assembly Oct 31st, 2007 |
| Replies: 9 Views: 1,708 Re: Sgdt,lgdt,ligdt,
That is the exact notes i have, i jus have a problem with if an operand or a memory ofset folows or es:di or ds:si. Thats all, nothng else i have 3 intel refrence books but none explains. How do i... |
| Forum: Assembly Oct 30th, 2007 |
| Replies: 4 Views: 1,109 Re: Vesa
Now what about the service giving me a direct pointer to the bank switch code so that i can call it using a far pointer? My book doesnt have that |
| Forum: Assembly Oct 30th, 2007 |
| Replies: 9 Views: 1,708 Re: Sgdt,lgdt,ligdt,
I am not looking for sgdt, i just want lgdt and the intel manual i am using is unclear. The code was executed in real mode using 3bytes while my operand overide was 66 or should i include 67h too for... |
| Forum: Assembly Oct 30th, 2007 |
| Replies: 9 Views: 1,708 Re: Sgdt,lgdt,ligdt,
I am trying to load lgdtr. I am initializing protected mode. So it is writen that the opcode's operand will be a word for the ptr limit and double word for ptr of base. Lets say my 48bits are at... |
| Forum: Assembly Oct 29th, 2007 |
| Replies: 9 Views: 1,708 Re: Sgdt,lgdt,ligdt,
The LGDT is stil causing me problems, what hapens to m16&m32 how many bytes wil folow and how wil the bytes represent the memory ofset? |
| Forum: Assembly Oct 29th, 2007 |
| Replies: 4 Views: 1,109 Vesa
Im coding on vesa mode 116h, i knw its properties like banks windows and resolution, my only problem is that i dont knw how to switch banks and dont know what the windows refer to. I also want help... |
| Forum: Assembly Oct 26th, 2007 |
| Replies: 9 Views: 1,708 I Need help on how to write the full opcode of...
I Need help on how to write the full opcode of the above x86 codes.
i saw like for sgdt it is 0F 01 /1. the problem is i dont know the full opcode will it be 0F01[01-this is what am not sure][then... |
