2024-04-14 05:35:43 +00:00
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struc VesaInfo
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{
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.Signature dd ?
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.Version dw ?
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.OEMNamePtr dd ?
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.Capabilities dd ?
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.VideoModesOffset dw ?
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.VideoModesSegment dw ?
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.CountOf64KBlocks dw ?
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.OEMSoftwareRevision dw ?
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.OEMVendorNamePtr dd ?
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.OEMProductNamePtr dd ?
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.OEMProductRevisionPtr dd ?
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.Reserved db 222 dup(?)
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.OEMData db 256 dup(?)
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}
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2024-04-28 06:41:36 +00:00
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defn VesaInfo
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2024-04-14 05:35:43 +00:00
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struc VesaModeInfo
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{
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.ModeAttributes dw ?
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.WindowAAttributes db ?
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.WindowBAttributes db ?
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.WindowGranularity dw ?
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.WindowSize dw ?
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.SegmentWindowA dw ?
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.SegmentWindowB dw ?
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.WindowPositioning dd ?
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.BytesPerScanLine dw ?
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; --
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.Width dw ?
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.Height dw ?
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.WidthChar db ?
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.HeightChar db ?
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.PlanesCount db ?
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.BitsPerPixel db ?
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.BanksCount db ?
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.MemoryModel db ?
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.BankSize db ?
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.ImagePagesCount db ?
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.Reserved db ?
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.RedMaskSize db ?
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.RedFieldPosition db ?
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.GreenMaskSize db ?
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.GreenFieldPosition db ?
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.BlueMaskSize db ?
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.BlueFieldPosition db ?
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.ReservedMaskSize db ?
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.ReservedMaskPosition db ?
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.DirectColorModeInfo db ?
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; -- VBE v1.2+
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.Framebuffer dd ?
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.OffScreenMemoryOffset dd ?
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.OffScreenMemorySize dd ?
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.Reserved2 db 206 dup(?)
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}
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defn VesaModeInfo
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2024-03-31 10:27:15 +00:00
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video_setup:
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2024-04-28 06:41:36 +00:00
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clc
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mov di, [vesa_block_buffer]
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mov ax, 0x4F00
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int 0x10
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cmp ax, 0x004F
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jne .err
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push word [vesa_block_buffer + VesaInfo.VideoModesSegment]
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pop es
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mov di, vesa_info_block_buffer
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mov bx, [vesa_block_buffer + VesaInfo.VideoModesOffset]
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mov cx, [bx]
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cmp cx, 0xFFFF
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je .err
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mov ax, 0x4F01
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int 0x10
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cmp ax, 0x004F
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jne .err
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2024-03-31 10:27:15 +00:00
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ret
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2024-04-28 06:41:36 +00:00
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.err:
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stc
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ret
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vesa_block_buffer VesaInfo
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vesa_info_block_buffer VesaModeInfo
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