• Peter Korsgaard's avatar
    x86-boot: don't request VBE2 information · 1722770f
    Peter Korsgaard authored
    The new x86 setup code (4fd06960) broke booting on an old P3/500MHz
    with an onboard Voodoo3 of mine. After debugging it, it turned out
    to be caused by the fact that the vesa probing now asks for VBE2 data.
    
    Disassembing the video BIOS shows that it overflows the vesa_general_info
    structure when VBE2 data is requested because the source addresses for the
    information strings which get strcpy'ed to the buffer lie outside the 32K
    BIOS code (and hence contain long sequences of 0xff's).
    
    E.G.:
    
    get_vbe_controller_info:
    00002A9C  60                pushaw
    00002A9D  1E                push ds
    00002A9E  0E                push cs
    00002A9F  1F                pop ds
    00002AA0  2BC9              sub cx,cx
    00002AA2  6626813D56424532  cmp dword [es:di],0x32454256 ; "VBE2"
    00002AAA  7501              jnz .1
    00002AAC  41                inc cx
    .1:
    00002AAD  51                push cx
    00002AAE  B91400            mov cx,0x14
    00002AB1  BED47F            mov si, controller_header
    00002AB4  57                push di
    00002AB5  F3A4              rep movsb ; copy vbe1.2 header
    
    00002AB7  B9EC00            mov cx,0xec
    00002ABA  2AC0              sub al,al
    00002ABC  F3AA              rep stosb ; zero pad remainder
    
    00002ABE  5F                pop di
    00002ABF  E8EB0D            call word get_memory
    00002AC2  C1E002            shl ax,0x2
    00002AC5  26894512          mov [es:di+0x12],ax ; total memory
    00002AC9  26C745040003      mov word [es:di+0x4],0x300 ; VBE version
    00002ACF  268C4D08          mov [es:di+0x8],cs
    00002AD3  268C4D10          mov [es:di+0x10],cs
    00002AD7  59                pop cx
    00002AD8  E361              jcxz .done ; VBE2 requested?
    00002ADA  8D9D0001          lea bx,[di+0x100]
    00002ADE  53                push bx
    00002ADF  87DF              xchg bx,di ; di now points to 2nd half
    00002AE1  26C747140001      mov word [es:bx+0x14],0x100 ; sw rev
    
    00002AE7  26897F06          mov [es:bx+0x6],di		; oem string
    00002AEB  268C4708          mov [es:bx+0x8],es
    00002AEF  BE5280            mov si,0x8052 ; oem string
    00002AF2  E87A1B            call word strcpy
    
    00002AF5  26897F0E          mov [es:bx+0xe],di ; video mode list
    00002AF9  268C4710          mov [es:bx+0x10],es
    00002AFD  B91E00            mov cx,0x1e
    00002B00  BEE87F            mov si,vidmodes
    00002B03  F3A5              rep movsw
    
    00002B05  26897F16          mov [es:bx+0x16],di ; oem vendor
    00002B09  268C4718          mov [es:bx+0x18],es
    00002B0D  BE2480            mov si,0x8024 ; oem vendor
    00002B10  E85C1B            call word strcpy
    
    00002B13  26897F1A          mov [es:bx+0x1a],di ; oem product
    00002B17  268C471C          mov [es:bx+0x1c],es
    00002B1B  BE3880            mov si,0x8038 ; oem product
    00002B1E  E84E1B            call word strcpy
    
    00002B21  26897F1E          mov [es:bx+0x1e],di ; oem product rev
    00002B25  268C4720          mov [es:bx+0x20],es
    00002B29  BE4580            mov si,0x8045 ; oem product rev
    00002B2C  E8401B            call word strcpy
    
    00002B2F  58                pop ax
    00002B30  B90001            mov cx,0x100
    00002B33  2BCF              sub cx,di
    00002B35  03C8              add cx,ax
    00002B37  2AC0              sub al,al
    00002B39  F3AA              rep stosb ; zero pad
    .done:
    00002B3B  1F                pop ds
    00002B3C  61                popaw
    00002B3D  B84F00            mov ax,0x4f
    00002B40  C3                ret
    
    (The full BIOS can be found at http://peter.korsgaard.com/vgabios.bin
    if interested).
    
    The old setup code didn't ask for VBE2 info, and the new code doesn't
    actually do anything with the extra information, so the fix is to simply
    not request it. Other BIOS'es might have the same problem.
    Signed-off-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    1722770f
vesa.h 1.91 KB