132 lines
5.2 KiB
C++
132 lines
5.2 KiB
C++
/*****************************************************************************
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* *
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* V E S A *
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* *
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*---------------------------------------------------------------------------*
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* Beschreibung: VESA-Treiber ueber 16-Bit BIOS. *
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* *
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* Autor: Michael Schoettner, HHU, 18.3.2017 *
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*****************************************************************************/
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#include "VESA.h"
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#include "device/bios/BIOS.h"
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// Informationen ueber einen VESA-Grafikmodus
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// (siehe http://wiki.osdev.org/VESA_Video_Modes)
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struct VbeModeInfoBlock {
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uint16_t attributes;
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uint8_t winA, winB;
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uint16_t granularity;
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uint16_t winsize;
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uint16_t segmentA, segmentB;
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uint16_t realFctPtr[2];
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uint16_t pitch; // Bytes pro Scanline
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uint16_t Xres, Yres;
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uint8_t Wchar, Ychar, planes, bpp, banks;
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uint8_t memory_model, bank_size, image_pages;
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uint8_t reserved0;
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uint8_t red_mask, red_position;
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uint8_t green_mask, green_position;
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uint8_t blue_mask, blue_position;
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uint8_t rsv_mask, rsv_position;
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uint8_t directcolor_attributes;
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uint32_t physbase; // Adresse des Linear-Framebuffers
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uint32_t OffScreenMemOffset;
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uint32_t OffScreenMemSize;
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} __attribute__((packed));
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// Informationen ueber die Grafikkarte
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// (siehe http://wiki.osdev.org/VESA_Video_Modes)
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struct VbeInfoBlock {
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char VbeSignature[4]; // == "VESA"
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uint16_t VbeVersion; // == 0x0300 for VBE 3.0
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uint16_t OemStringPtr[2]; // isa vbeFarPtr
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uint8_t Capabilities[4];
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uint16_t VideoModePtr[2]; // isa vbeFarPtr
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uint16_t TotalMemory; // as # of 64KB blocks
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} __attribute__((packed));
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/*****************************************************************************
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* Methode: VESA::initTextMode *
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*---------------------------------------------------------------------------*
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* Beschreibung: Schalter in den Text-Modus 80x25 Zeichen. *
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*****************************************************************************/
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void VESA::initTextMode() {
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BC_params->AX = 0x4f02; // SVFA BIOS, init mode
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BC_params->BX = 0x4003; // 80x25
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BIOS::Int(0x10);
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}
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/*****************************************************************************
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* Methode: VESA::initGraphicMode *
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*---------------------------------------------------------------------------*
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* Parameter: Nummer des Grafikmodus (siehe VESA.h) *
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* *
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* Beschreibung: Bestimmten Grafikmodus einschalten. Dies wird durch *
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* einen Aufruf des BIOS gemacht. *
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*****************************************************************************/
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bool VESA::initGraphicMode(uint16_t mode) {
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// Alle Grafikmodi abfragen
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BC_params->AX = 0x4F00;
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BC_params->ES = RETURN_MEM >> 4;
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BC_params->DI = RETURN_MEM & 0xF;
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BIOS::Int(0x10);
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VbeInfoBlock* ib = reinterpret_cast<VbeInfoBlock*>(RETURN_MEM);
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// Signaturen pruefen
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if (BC_params->AX != 0x004F) {
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log.error() << "VESA wird nicht unterstuetzt." << endl;
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return false;
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}
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if (ib->VbeSignature[0] != 'V' || ib->VbeSignature[1] != 'E' ||
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ib->VbeSignature[2] != 'S' || ib->VbeSignature[3] != 'A') {
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log.error() << "VESA wird nicht unterstuetzt." << endl;
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return false;
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}
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// kout << "TotalVideoMemory: " << ((ib->TotalMemory*65536) / (1024*1024)) << " MB" << endl;
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// Gewuenschten Grafikmodus aus Antwort suchen
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auto* modePtr = reinterpret_cast<uint16_t*>((ib->VideoModePtr[1] << 4) + ib->VideoModePtr[0]);
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for (uint32_t i = 0; modePtr[i] != 0xFFFF; ++i) {
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// Gewuenschter Grafikmodus gefunden?
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if (modePtr[i] == mode) {
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VbeModeInfoBlock* minf = reinterpret_cast<VbeModeInfoBlock*>(RETURN_MEM);
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// Weitere Infos ueber diesen Grafikmodus abfragen
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BC_params->AX = 0x4F01;
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BC_params->CX = mode;
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BC_params->ES = RETURN_MEM >> 4;
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BC_params->DI = RETURN_MEM & 0xF;
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BIOS::Int(0x10);
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// Text-Modi 0-3 haben keinen LFB
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if (mode > 3 && (minf->attributes & 0x90) == 0) {
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log.error() << "Grafikmodus bietet keinen linearen Framebuffer." << endl;
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return false;
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}
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mode_nr = mode;
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xres = minf->Xres;
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yres = minf->Yres;
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bpp = static_cast<uint8_t>(minf->bpp);
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lfb = minf->physbase;
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hfb = reinterpret_cast<uint32_t>(new char[xres * yres * bpp / 8]);
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// Grafikmodus einschalten
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BC_params->AX = 0x4f02; // SVFA BIOS, init mode
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BC_params->BX = mode;
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BIOS::Int(0x10);
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return true;
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}
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}
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log.error() << "Grafikmodus nicht gefunden." << endl;
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return false;
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}
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