1 files changed, 111 insertions, 0 deletions
diff --git a/kernel/vesa.c b/kernel/vesa.c
new file mode 100644
index 0000000..93a42f3
--- /dev/null
+++ b/kernel/vesa.c
@@ -0,0 +1,111 @@
+//http://wiki.osdev.org/GUI
+#include "kernel.h"
+
+typedef struct vbeinfo_struct{
+   char VbeSignature[4];             // == "VESA"
+   uint16_t VbeVersion;                 // == 0x0300 for VBE 3.0
+   uint16_t OemStringPtr[2];            // isa vbeFarPtr
+   uint8_t Capabilities[4];
+   uint16_t VideoModePtr[2];         // isa vbeFarPtr
+   uint16_t TotalMemory;             // as # of 64KB blocks
+}vbeinfo;
+
+typedef struct ModeInfoBlock {
+  uint16_t attributes;
+  uint8_t winA,winB;
+  uint16_t granularity;
+  uint16_t winsize;
+  uint16_t segmentA, segmentB;
+  uint16_t realFctPtr[2];
+//  VBE_FAR(realFctPtr);
+  uint16_t pitch; // bytes per scanline
+ 
+  uint16_t Xres, Yres;
+  uint8_t Wchar, Ychar, planes, bpp, banks;
+  uint8_t memory_model, bank_size, image_pages;
+  uint8_t reserved0;
+ 
+  uint8_t red_mask, red_position;
+  uint8_t green_mask, green_position;
+  uint8_t blue_mask, blue_position;
+  uint8_t rsv_mask, rsv_position;
+  uint8_t directcolor_attributes;
+ 
+  uint32_t physbase;  // your LFB (Linear Framebuffer) address ;)
+  uint32_t reserved1;
+  uint16_t reserved2;
+}vbemodeinfo;
+
+static vbemodeinfo *VbeModeInfoBlock;
+
+void vesa_init(vbeinfo *info,vbemodeinfo *mode)
+{
+    int i=0;
+
+//    while(info[i].VbeSignature[0]=='V')
+ //   {
+	scr_put_string("vesa: init vbe version: ");
+	scr_put_hex(info[i].VbeVersion);
+	scr_put_string(" / videomode ptr:  ");
+	scr_put_hex(info[i].VideoModePtr[0]);
+	scr_put_hex(info[i].VideoModePtr[1]);
+	scr_put_string_nl("");
+
+//	i++;
+ //   }
+ //
+    int *modeptr=info[i].VideoModePtr[0]; // 0x8322; // do not hardcode !!! take from vbeinfo!
+
+    while(*modeptr!=0xffff&&*modeptr!=0)
+    {
+
+	scr_put_string("vesa: mode supported:  ");
+	scr_put_hex(*modeptr);
+	scr_put_string_nl("");
+
+	modeptr++;
+    }
+
+    scr_put_string("vesa: selected mode res: ");
+    scr_put_hex(mode->Xres);
+    scr_put_string(" x ");
+    scr_put_hex(mode->Yres);
+    scr_put_string_nl("");
+    scr_put_string("vesa: selected mode banks: ");
+    scr_put_hex(mode->banks);
+    scr_put_string_nl("");
+    scr_put_string("vesa: attribs: ");
+    scr_put_hex(mode->attributes);
+    scr_put_string_nl("");
+    scr_put_string("vesa: physbase: ");
+    scr_put_hex32(mode->physbase);
+    scr_put_string_nl("");
+    scr_put_string("vesa: bpp: ");
+    scr_put_hex(mode->bpp);
+    scr_put_string_nl("");
+/*
+uint8_t *videomem=mode->physbase;
+for(i=0;i<0xffffff;i++)
+{
+    videomem[i]=i;
+}
+*/
+    
+    VbeModeInfoBlock=mode;
+
+
+}
+
+void PutPixel(int x,int y, int color){
+
+    //do not write memory outside the screen buffer, check parameters against the VBE mode info
+    if (x<0 || x>VbeModeInfoBlock->Xres|| y<0 || y>VbeModeInfoBlock->Yres) return;
+//
+    if (x) x = (x*(VbeModeInfoBlock->bpp>>3)); // get bytes (divide by 8)
+    if (y) y = (y*VbeModeInfoBlock->pitch);
+    uint8_t *cTemp=VbeModeInfoBlock->physbase;
+    cTemp[x+y] =  (uint8_t)(color & 0xff);
+    cTemp[x+y+1] = (uint8_t)((color>>8) & 0xff);
+    cTemp[x+y+2] = (uint8_t)((color>>16) & 0xff);
+ }
+