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VESA VBE Function always failed

General and Gameplay Programming Programming

Started by Pixel Clock October 10, 2011 08:02 AM

0 comments, last by _the_phantom_ 12 years, 6 months ago

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October 10, 2011 08:02 AM

I am trying to use the int 0x10(VIDEO BIOS) but it always returns al != 0x4f(VBE Function failed). This is the code that I write in a driver:



USHORT GetVbeMode()  



{  



__asm  



{  



cli  



mov eax,cr0  



mov Cr0Reg,eax  



and eax,0xffffffff  



mov cr0,eax  







mov eax,0x4F03      ;VESA VBE Function  







INT 0x10            ;VIDEO BIOS  







cmp al,0x4F  



jnz falhou          ;always al != 4f  







mov Resultado,bx  



mov eax,Cr0Reg  



mov cr0,eax  



sti  



jmp final  







falhou  



mov Resultado,0  



mov eax,Cr0Reg  



mov cr0,eax  



sti  



jmp final  







final:  



}  



return Resultado;  



}