Create vesa.h

Add header for the base VLB VBE VESA driver
2026-01-19 20:05:20 -08:00 · 2026-01-18 17:30:08 -08:00
parent d0fe2cff1b
commit 055e3dce56
1 changed files with 67 additions and 0 deletions
--- a/kernel/vesa.h
+++ b/kernel/vesa.h
@@ -0,0 +1,67 @@
+#ifndef VESA_H
+#define VESA_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+// VESA BIOS Extension 2.0 Function Calls
+#define VBE_FUNCTION_SET_MODE        0x4F02
+#define VBE_FUNCTION_GET_MODE_INFO   0x4F01
+#define VBE_FUNCTION_GET_CONTROLLER_INFO 0x4F00
+#define VBE_FUNCTION_SET_DISPLAY_START 0x4F05
+
+// VESA Mode Information Structure (VBE 2.0)
+typedef struct {
+    uint16_t ModeAttributes;      // Mode attributes
+    uint8_t WinAAttributes;       // Window A attributes
+    uint8_t WinBAttributes;       // Window B attributes
+    uint16_t WinGranularity;      // Window granularity
+    uint16_t WinSize;             // Window size
+    uint16_t WinASegment;         // Window A segment address
+    uint16_t WinBSegment;         // Window B segment address
+    uint32_t WinFuncPtr;          // Function pointer for window
+    uint16_t BytesPerScanLine;    // Bytes per scanline
+    uint16_t XResolution;         // Horizontal resolution in pixels
+    uint16_t YResolution;         // Vertical resolution in pixels
+    uint8_t XCharSize;            // Character cell width
+    uint8_t YCharSize;            // Character cell height
+    uint8_t NumberOfPlanes;       // Number of memory planes
+    uint8_t BitsPerPixel;         // Bits per pixel
+    uint8_t NumberOfBanks;        // Number of banks
+    uint8_t MemoryModel;          // Memory model type
+    uint8_t BankSize;             // Bank size in kB
+    uint8_t NumberOfImagePages;   // Number of image pages
+    uint8_t Reserved0;            // Reserved
+    uint8_t RedMaskSize;          // Red mask size
+    uint8_t RedFieldPosition;     // Red field position
+    uint8_t GreenMaskSize;        // Green mask size
+    uint8_t GreenFieldPosition;   // Green field position
+    uint8_t BlueMaskSize;         // Blue mask size
+    uint8_t BlueFieldPosition;    // Blue field position
+    uint8_t RsvdMaskSize;         // Reserved mask size
+    uint8_t RsvdFieldPosition;    // Reserved field position
+    uint8_t DirectColorModeInfo;  // Direct color mode info
+    uint32_t PhysBasePtr;         // Physical base address of the linear framebuffer
+    uint32_t OffScreenMemOff;     // Offset to off-screen memory
+    uint16_t OffScreenMemSize;    // Size of off-screen memory
+    uint8_t Reserved1[206];       // Reserved
+} __attribute__((packed)) vbe_mode_info_t;
+
+// VESA Controller Information
+typedef struct {
+    uint8_t VESAVersion[2];       // VESA version
+    uint32_t OEMStringPtr;        // Pointer to OEM string
+    uint8_t Capabilities[4];      // Capabilities of the controller
+    uint32_t VideoModePtr;        // Pointer to supported video modes
+    uint16_t TotalMemory;         // Total video memory (in 64KB)
+    uint8_t Reserved[4];          // Reserved
+} __attribute__((packed)) vbe_controller_info_t;
+
+// Function Prototypes
+bool vesa_set_mode(uint16_t mode);
+bool vesa_get_mode_info(uint16_t mode, vbe_mode_info_t* info);
+bool vesa_get_controller_info(vbe_controller_info_t* info);
+void* vesa_get_framebuffer(void);
+void vesa_clear_screen(uint32_t color);
+
+#endif // VESA_H