add vorgabe07

2022-06-17 15:27:48 +02:00
parent 01495fda93
commit d29dc064cb
23 changed files with 19128 additions and 2 deletions
--- a/c_os/devices/VESA.cc
+++ b/c_os/devices/VESA.cc
@ -0,0 +1,137 @@
+/*****************************************************************************
+ *                                                                           *
+ *                                 V E S A                                   *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Beschreibung:    VESA-Treiber ueber 16-Bit BIOS.                          *
+ *                                                                           *
+ * Autor:           Michael Schoettner, HHU, 18.3.2017                       *
+ *****************************************************************************/
+
+
+#include "devices/VESA.h"
+#include "kernel/BIOS.h"
+#include "kernel/Globals.h"
+
+
+// Informationen ueber einen VESA-Grafikmodus
+// (siehe http://wiki.osdev.org/VESA_Video_Modes)
+struct VbeModeInfoBlock {
+    unsigned short  attributes;
+    unsigned char   winA,winB;
+    unsigned short  granularity;
+    unsigned short  winsize;
+    unsigned short  segmentA, segmentB;
+    unsigned short  realFctPtr[2];
+    unsigned short  pitch;          // Bytes pro Scanline
+    
+    unsigned short  Xres, Yres;
+    unsigned char   Wchar, Ychar, planes, bpp, banks;
+    unsigned char   memory_model, bank_size, image_pages;
+    unsigned char   reserved0;
+    
+    unsigned char   red_mask, red_position;
+    unsigned char   green_mask, green_position;
+    unsigned char   blue_mask, blue_position;
+    unsigned char   rsv_mask, rsv_position;
+    unsigned char   directcolor_attributes;
+    
+    unsigned int    physbase;       // Adresse des Linear-Framebuffers
+    unsigned int    OffScreenMemOffset;
+    unsigned short  OffScreenMemSize;
+} __attribute__((packed));
+
+
+// Informationen ueber die Grafikkarte
+// (siehe http://wiki.osdev.org/VESA_Video_Modes)
+struct VbeInfoBlock {
+    char            VbeSignature[4];        // == "VESA"
+    unsigned short  VbeVersion;             // == 0x0300 for VBE 3.0
+    unsigned short  OemStringPtr[2];        // isa vbeFarPtr
+    unsigned char   Capabilities[4];
+    unsigned short  VideoModePtr[2];        // isa vbeFarPtr
+    unsigned short  TotalMemory;            // as # of 64KB blocks
+} __attribute__((packed));
+
+
+/*****************************************************************************
+ * Methode:         VESA::initTextMode                                       *
+ *---------------------------------------------------------------------------*
+ * Beschreibung:    Schalter in den Text-Modus 80x25 Zeichen.                *
+ *****************************************************************************/
+void VESA::initTextMode() {
+    BC_params->AX = 0x4f02;     // SVFA BIOS, init mode
+    BC_params->BX = 0x4003;     // 80x25
+    bios.Int(0x10);
+}
+
+
+/*****************************************************************************
+ * Methode:         VESA::initGraphicMode                                    *
+ *---------------------------------------------------------------------------*
+ * Parameter:       Nummer des Grafikmodus (siehe VESA.h)                    *
+ *                                                                           *
+ * Beschreibung:    Bestimmten Grafikmodus einschalten. Dies wird durch      *
+ *                  einen Aufruf des BIOS gemacht.                           *
+ *****************************************************************************/
+bool VESA::initGraphicMode(unsigned short mode) {
+
+    // Alle Grafikmodi abfragen
+    BC_params->AX = 0x4F00;
+    BC_params->ES = RETURN_MEM >> 4;
+    BC_params->DI = RETURN_MEM & 0xF;
+    bios.Int(0x10);
+    
+    struct VbeInfoBlock *ib = (struct VbeInfoBlock *) RETURN_MEM;
+    
+    // Signaturen pruefen
+    if (BC_params->AX != 0x004F) {
+        kout << "Error: VESA wird nicht unterstuetzt." << endl;
+        return false;
+    }
+    if (ib->VbeSignature[0]!='V' || ib->VbeSignature[1]!='E' ||
+        ib->VbeSignature[2]!='S' || ib->VbeSignature[3]!='A' ) {
+        kout << "Error: VESA wird nicht unterstuetzt." << endl;
+        return false;
+    }
+
+//    kout << "TotalVideoMemory:  " << ((ib->TotalMemory*65536) / (1024*1024)) << " MB" << endl;
+
+    // Gewuenschten Grafikmodus aus Antwort suchen
+    unsigned short *modePtr = (unsigned short*)( (ib->VideoModePtr[1]<<4) + ib->VideoModePtr[0]);
+    for (int i=0; modePtr[i]!=0xFFFF; ++i ) {
+        // Gewuenschter Grafikmodus gefunden?
+        if (modePtr[i] == mode) {
+            struct VbeModeInfoBlock *minf = (struct VbeModeInfoBlock *)RETURN_MEM;
+            
+            // Weitere Infos ueber diesen Grafikmodus abfragen
+            BC_params->AX = 0x4F01;
+            BC_params->CX = mode;
+            BC_params->ES = RETURN_MEM >> 4;
+            BC_params->DI = RETURN_MEM & 0xF;
+            bios.Int(0x10);
+
+            // Text-Modi 0-3 haben keinen LFB
+            if ( mode > 3 && (minf->attributes & 0x90) == 0 ) {
+                kout << "Error: Grafikmodus bietet keinen linearen Framebuffer." << endl;
+                return false;
+            }
+ 
+            mode_nr = mode;
+            xres = minf->Xres;
+            yres = minf->Yres;
+            bpp  = (int) minf->bpp;
+            lfb  = minf->physbase;
+            
+            hfb  = (unsigned int) new char [xres*yres*bpp/8];
+        
+            // Grafikmodus einschalten
+            BC_params->AX = 0x4f02;   // SVFA BIOS, init mode
+            BC_params->BX = mode;
+            bios.Int(0x10);
+            return true;
+        }
+    }
+    kout << "Error: Grafikmodus nicht gefunden." << endl;
+    return false;
+}