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76 lines
3.6 KiB
C
76 lines
3.6 KiB
C
#ifndef VESA_H
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#define VESA_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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// VESA BIOS Extension 2.0 Function Calls
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#define VBE_FUNCTION_SET_MODE 0x4F02
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#define VBE_FUNCTION_GET_MODE_INFO 0x4F01
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#define VBE_FUNCTION_GET_CONTROLLER_INFO 0x4F00
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#define VBE_FUNCTION_SET_DISPLAY_START 0x4F05
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// VESA Mode Information Structure (VBE 2.0)
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typedef struct {
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uint16_t ModeAttributes; // Mode attributes
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uint8_t WinAAttributes; // Window A attributes
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uint8_t WinBAttributes; // Window B attributes
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uint16_t WinGranularity; // Window granularity
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uint16_t WinSize; // Window size
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uint16_t WinASegment; // Window A segment address
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uint16_t WinBSegment; // Window B segment address
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uint32_t WinFuncPtr; // Function pointer for window
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uint16_t BytesPerScanLine; // Bytes per scanline
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uint16_t XResolution; // Horizontal resolution in pixels
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uint16_t YResolution; // Vertical resolution in pixels
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uint8_t XCharSize; // Character cell width
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uint8_t YCharSize; // Character cell height
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uint8_t NumberOfPlanes; // Number of memory planes
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uint8_t BitsPerPixel; // Bits per pixel
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uint8_t NumberOfBanks; // Number of banks
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uint8_t MemoryModel; // Memory model type
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uint8_t BankSize; // Bank size in kB
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uint8_t NumberOfImagePages; // Number of image pages
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uint8_t Reserved0; // Reserved
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uint8_t RedMaskSize; // Red mask size
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uint8_t RedFieldPosition; // Red field position
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uint8_t GreenMaskSize; // Green mask size
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uint8_t GreenFieldPosition; // Green field position
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uint8_t BlueMaskSize; // Blue mask size
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uint8_t BlueFieldPosition; // Blue field position
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uint8_t RsvdMaskSize; // Reserved mask size
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uint8_t RsvdFieldPosition; // Reserved field position
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uint8_t DirectColorModeInfo; // Direct color mode info
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uint32_t PhysBasePtr; // Physical base address of the linear framebuffer
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uint32_t OffScreenMemOff; // Offset to off-screen memory
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uint16_t OffScreenMemSize; // Size of off-screen memory
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uint8_t Reserved1[206]; // Reserved
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} __attribute__((packed)) vbe_mode_info_t;
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// VESA Controller Information
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typedef struct {
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char Signature[4]; // Should be "VESA" (or "VBE2" for request)
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uint16_t Version; // VBE version; high byte is major, low is minor
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uint32_t OEMStringPtr; // Segment:Offset pointer to OEM string
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uint32_t Capabilities; // Capabilities of graphics controller
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uint32_t VideoModePtr; // Segment:Offset pointer to supported modes list
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uint16_t TotalMemory; // Number of 64KB memory blocks
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uint16_t OEMSoftwareRev; // VBE implementation Software revision
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uint32_t OEMVendorNamePtr; // Segment:Offset pointer to Vendor Name string
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uint32_t OEMProductNamePtr; // Segment:Offset pointer to Product Name string
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uint32_t OEMProductRevPtr; // Segment:Offset pointer to Product Revision string
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uint8_t Reserved[222]; // Reserved for VBE implementation scratch area
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uint8_t OEMData[256]; // Data area for OEM strings
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} __attribute__((packed)) vbe_controller_info_t;
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// Function Prototypes
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bool vesa_set_mode(uint16_t mode);
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bool vesa_get_mode_info(uint16_t mode, vbe_mode_info_t* info);
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bool vesa_get_controller_info(vbe_controller_info_t* info);
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void* vesa_get_framebuffer(void);
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void vesa_clear_screen(uint32_t color);
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#endif // VESA_H
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