802 lines
18 KiB
C
Executable File
802 lines
18 KiB
C
Executable File
#include "vga.h"
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#include "memory.h"
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#include "asm.h"
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#include "types.h"
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#include "VGA/modes.c"
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#include "VGA/8x8fnt.c"
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#include "VGA/8x16fnt.c"
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/* Registres VGAs */
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#define sequencer 0x3c4
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#define misc 0x3c2
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#define ccrt 0x3D4
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#define attribs 0x3c0
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#define graphics 0x3ce
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#define state 0x3da
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/* Taille d'un plan de bit */
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#define planesize 0x10000
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static u16 resX, resY, color, splitY; /* resolution x,y en caractères et profondeur */
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static u8 pages, activepage, showedpage; /* nombre de pages disponibles N° de la page active */
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static u32 linesize, pagesize; /* Taille d'une ligne et d'une page */
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static u8 vmode = 0xFF; /* mode en cours d'utilisation */
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static u32 basemem; /* Adresse de la mémoire vidéo */
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static bool scrolling, graphic, blink; /* Activation du défilement, Flag du mode graphique */
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/*******************************************************************************/
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/* Donne la resolution max horizontale */
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u16 getxres()
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{
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return resX;
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}
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/*******************************************************************************/
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/* Donne la profondeur en bit */
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u8 getdepth()
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{
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return color;
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}
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/*******************************************************************************/
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/* Donne la resolution max verticale */
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u16 getyres()
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{
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return resY - splitY;
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}
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/*******************************************************************************/
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/* Donne le nombre max de page ecran dispo */
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u16 getnbpages()
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{
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return pages;
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}
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/*******************************************************************************/
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/* Fixe la page ecran de travail */
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void setpage(u8 page)
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{
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if (page < pages)
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activepage = page;
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}
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/*******************************************************************************/
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/* Recupere la page ecran de travail */
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u8 getpage()
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{
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return activepage;
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}
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/*******************************************************************************/
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/* Affiche la page ecran specifié */
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void showpage(u8 page)
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{
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if (page < pages) {
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u16 addr;
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addr = page * pagesize / 2;
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outb(ccrt, 0x0C);
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outb(ccrt + 1, (addr >> 8));
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outb(ccrt, 0x0D);
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outb(ccrt + 1, (addr & 0xFF));
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showedpage = page;
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}
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}
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/*******************************************************************************/
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/* Sépare l'écran en 2 a partir de la ligne Y */
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void split(u16 y)
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{
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u16 addr;
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if (graphic == 0)
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addr = (y << 3);
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else
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addr = y;
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/* line compare pour ligne atteinte */
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outb(ccrt, 0x18);
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outb(ccrt + 1, (addr & 0xFF));
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/* overflow pour le bit 8 */
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outb(ccrt, 0x07);
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outb(ccrt + 1, (inb(ccrt + 1) & ~16) | ((addr >> 4) & 16));
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/* Maximum Scan Line pour le bit 9 */
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outb(ccrt, 0x09);
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outb(ccrt + 1, (inb(ccrt + 1) & ~64) | ((addr >> 3) & 64));
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splitY = y;
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}
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/*******************************************************************************/
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/* Sépare l'écran en 2 a partir de la ligne Y */
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void unsplit()
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{
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/* line compare pour ligne atteinte */
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outb(ccrt, 0x18);
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outb(ccrt + 1, 0);
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/* overflow pour le bit 8 */
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outb(ccrt, 0x07);
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outb(ccrt + 1, inb(ccrt + 1) & ~16);
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/* Maximum Scan Line pour le bit 9 */
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outb(ccrt, 0x09);
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outb(ccrt + 1, inb(ccrt + 1) & ~64);
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splitY = 0;
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}
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/*******************************************************************************/
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/* Attend la retrace verticale */
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void waitvretrace()
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{
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while ((inb(state) & 8) == 0) ;
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}
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/*******************************************************************************/
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/* Attend la retrace horizontale */
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void waithretrace()
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{
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while ((inb(state) & 1) == 0) ;
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}
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/*******************************************************************************/
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/* Active l'affichage du curseur de texte */
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void enablecursor()
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{
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u8 curs;
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/* active le curseur hardware */
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outb(ccrt, 10);
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curs = inb(ccrt + 1) & ~32;
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outb(ccrt + 1, curs);
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}
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/*******************************************************************************/
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/* Desactive l'affichage du curseur de texte */
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void disablecursor()
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{
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u8 curs;
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/* Desactive le curseur hardware */
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outb(ccrt, 10);
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curs = inb(ccrt + 1) | 32;
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outb(ccrt + 1, curs);
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}
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/*******************************************************************************/
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/* Active le scrolling en cas de débordement d'écran */
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void enablescroll()
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{
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scrolling = true;
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}
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/*******************************************************************************/
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/* Desactive le scrolling en cas de débordement d'écran */
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void disablescroll()
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{
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scrolling = false;
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}
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/*******************************************************************************/
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/* Utilise le plan de bit spécifié */
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void useplane(u8 plan)
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{
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u8 mask;
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plan &= 3;
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mask = 1 << plan;
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/* choisi le plan de lecture */
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outb(graphics, 4);
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outb(graphics + 1, plan);
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/* choisi le plan d'ecriture */
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outb(sequencer, 2);
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outb(sequencer + 1, mask);
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}
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/*******************************************************************************/
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/* Renvoie l'adresse du segment video */
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u32 getbase(void)
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{
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u32 base;
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outb(graphics, 6);
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base = inb(graphics + 1);
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base >>= 2;
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base &= 3;
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switch (base) {
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case 0:
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case 1:
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base = 0xA0000;
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break;
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case 2:
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base = 0xB0000;
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break;
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case 3:
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base = 0xB8000;
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break;
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}
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return base;
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}
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/*******************************************************************************/
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/* efface l'écran */
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void (*fill) (u8 attrib);
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void fill_text(u8 attrib)
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{
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memset((u8 *) (basemem + activepage * pagesize), ' ', pagesize / 2, 2);
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memset((u8 *) (basemem + activepage * pagesize + 1), attrib,
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pagesize / 2, 2);
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}
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void fill_chain(u8 attrib)
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{
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memset((u8 *) (basemem + activepage * pagesize), attrib & 0x0F,
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pagesize, 1);
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}
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void fill_unchain(u8 attrib)
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{
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int i;
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for (i = 0; i < 4; i++) {
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useplane(i);
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memset((u8 *) (basemem + activepage * pagesize), attrib & 0x0F,
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pagesize, 1);
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}
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}
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/*******************************************************************************/
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/* fixe la position du curseur texte */
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void gotoscr(u16 x, u16 y)
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{
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u16 pos;
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if (splitY == 0)
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pos = (showedpage * pagesize / 2 + x + y * resX);
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else
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pos = (x + y * resX);
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outb(ccrt, 0x0F);
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outb(ccrt + 1, (u8) (pos & 0x00FF));
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outb(ccrt, 0x0E);
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outb(ccrt + 1, (u8) ((pos & 0xFF00) >> 8));
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}
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/*******************************************************************************/
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/* Fait defiler l'ecran de n lignes vers le haut */
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void (*scroll) (u8 lines, u8 attrib);
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void scroll_unchain(u8 lines, u8 attrib)
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{
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if (scrolling) {
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u8 i;
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for (i = 0; i < 4; i++) {
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useplane(i);
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memcpy((u8 *) (basemem + activepage * pagesize +
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linesize * 8 * lines), (u8 *) basemem,
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pagesize - linesize * 8 * lines, 1);
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memset((u8 *) (basemem + activepage * pagesize +
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pagesize - linesize * 8 * lines),
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attrib & 0x0F, linesize * 8 * lines, 1);
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}
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}
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}
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void scroll_chain(u8 lines, u8 attrib)
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{
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if (scrolling) {
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memcpy((u8 *) basemem + activepage * pagesize +
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linesize * 8 * lines,
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(u8 *) basemem + activepage * pagesize,
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pagesize - linesize * 8 * lines, 1);
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memset((u8 *) (basemem + activepage * pagesize + pagesize -
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linesize * 8 * lines), attrib & 0x0F,
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linesize * 8 * lines, 1);
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}
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}
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void scroll_text(u8 lines, u8 attrib)
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{
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if (scrolling) {
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memcpy((u8 *) basemem + activepage * pagesize +
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linesize * lines, (u8 *) basemem + activepage * pagesize,
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pagesize - linesize * lines, 1);
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memset((u8 *) (basemem + activepage * pagesize + pagesize -
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linesize * lines - 2), ' ',
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(linesize * lines) / 2, 2);
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memset((u8 *) (basemem + activepage * pagesize + pagesize -
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linesize * lines - 1), attrib,
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(linesize * lines) / 2, 2);
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}
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}
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/*******************************************************************************/
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/* Affiche le caractère a l'écran */
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void (*showchar) (u16 coordx, u16 coordy, u8 thechar, u8 attrib);
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void showchar_graphic(u16 coordx, u16 coordy, u8 thechar, u8 attrib)
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{
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u8 x, y, pattern, set;
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for (y = 0; y < 8; y++) {
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pattern = font8x8[thechar * 8 + y];
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for (x = 0; x < 8; x++) {
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set = ((pattern >> (7 - x)) & 0x1); /* mettre un ROL importé depuis asm */
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if (set == 0)
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writepxl(coordx * 8 + x, coordy * 8 + y,
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((attrib & 0xF0) >> 8) * set);
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else
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writepxl(coordx * 8 + x, coordy * 8 + y,
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(attrib & 0x0F) * set);
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}
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}
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}
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void showchar_text(u16 coordx, u16 coordy, u8 thechar, u8 attrib)
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{
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u8 *screen;
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screen =
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(u8 *) basemem + activepage * pagesize + 2 * (coordx +
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coordy * resX);
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*screen = thechar;
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*(++screen) = attrib;
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}
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/*******************************************************************************/
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/* Recupere le caractère a l'écran */
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u8(*getchar) (u16 coordx, u16 coordy);
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u8 getchar_text(u16 coordx, u16 coordy)
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{
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u8 *screen;
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screen =
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(u8 *) basemem + activepage * pagesize + 2 * (coordx +
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coordy * resX);
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return *screen;
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}
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/*******************************************************************************/
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/* Recupere les attributs a l'écran */
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u8(*getattrib) (u16 coordx, u16 coordy);
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u8 getattrib_text(u16 coordx, u16 coordy)
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{
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u8 *screen;
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screen =
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(u8 *) basemem + activepage * pagesize + 2 * (coordx +
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coordy * resX) + 1;
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return *screen;
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}
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/*******************************************************************************/
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/* Ecrit un pixel a l'écran */
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void (*writepxl) (u16 x, u16 y, u32 c);
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void writepxl_1bit(u16 x, u16 y, u32 c)
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{
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u8 *off;
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u8 mask;
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c = (c & 1) * 0xFF;
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off = (u8 *) (basemem + activepage * pagesize + linesize * y + x / 8);
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x = (x & 7) * 1;
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mask = 0x80 >> x;
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*off = ((*off) & ~mask) | (c & mask);
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}
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void writepxl_2bits(u16 x, u16 y, u32 c)
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{
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u8 *off;
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u8 mask;
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c = (c & 3) * 0x55;
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off = (u8 *) (basemem + activepage * pagesize + linesize * y + x / 4);
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x = (x & 3) * 2;
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mask = 0xC0 >> x;
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*off = ((*off) & ~mask) | (c & mask);
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}
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void writepxl_4bits(u16 x, u16 y, u32 c)
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{
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u8 *off;
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u8 mask, p, pmask;
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off = (u8 *) (basemem + activepage * pagesize + linesize * y + x / 8);
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x = (x & 7) * 1;
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mask = 0x80 >> x;
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pmask = 1;
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for (p = 0; p < 4; p++) {
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useplane(p);
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if (pmask & c)
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*off = ((*off) | mask);
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else
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*off = ((*off) & ~mask);
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pmask <<= 1;
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}
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}
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void writepxl_8bits(u16 x, u16 y, u32 c)
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{
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u8 *off;
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off = (u8 *) (basemem + activepage * pagesize + linesize * y + x);
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*off = c;
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}
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void writepxl_8bitsunchain(u16 x, u16 y, u32 c)
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{
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u8 *off;
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off = (u8 *) (basemem + activepage * pagesize + linesize * y + x / 4);
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useplane(x & 3);
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*off = c;
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}
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/*******************************************************************************/
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/* Met le mode video suivant */
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u8 nextvmode()
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{
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u8 mode = getvmode();
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mode++;
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if (mode >= 0x80) {
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if (mode > maxgraphmode)
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mode = 0x0;
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} else {
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if (mode > maxtextmode)
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mode = 0x80;
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}
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setvmode(mode);
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return mode;
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}
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/*******************************************************************************/
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/* Change le mode video courant */
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u32 setvmode(u8 mode)
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{
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u8 *def, gmode;
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/* Récupere la definition des registres VGA en fonction du mode
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graphique : >0x80
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text : 0x00 - 0x7F
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*/
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if (mode >= 0x80) {
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gmode = mode - 0x80;
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if (gmode > maxgraphmode)
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return 1; /* mode inexistant */
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def = graphmodes[gmode];
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graphic = true;
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} else {
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if (mode > maxtextmode)
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return 1; /* mode inexistant */
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def = textmodes[mode];
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graphic = false;
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loadfont(font8x8, 8, 1);
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loadfont(font8x16, 16, 0);
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}
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/* Initialise les registre "divers" */
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outb(misc, def[0]);
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/* Initialise les registre d'etat */
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outb(state, 0x00);
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/* Initialise le séquenceur */
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outreg(sequencer, &def[1], 5);
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/* Debloque le verouillage des registres controleur CRT */
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outb(ccrt, 0x11);
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outb(ccrt + 1, 0x0E);
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/* Initialise le controleur CRT */
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outreg(ccrt, &def[6], 25);
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/* Initialise le controleur graphique */
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outreg(graphics, &def[31], 9);
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inb(state);
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/* Initialise le controleur d'attributs */
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outregsame(attribs, &def[40], 21);
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inb(state);
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outb(attribs, 0x20);
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/* Récupere depuis la table de définition des mode la résolution et la
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profondeur (en bits) */
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resX = def[61];
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resY = def[62];
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color = def[63];
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/* Initialise l'adresse des procedures de gestion graphique et les differentes
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variables en fonction de la profondeur et du mode */
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if (!graphic) {
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/* mode texte */
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linesize = resX * 2;
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writepxl = NULL; /* pas d'affichage de pixels */
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showchar = showchar_text;
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scroll = scroll_text;
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fill = fill_text;
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pagesize = resY * linesize;
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getchar = getchar_text;
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getattrib = getattrib_text;
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} else {
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switch (color) {
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case 1:
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/* mode N&B */
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linesize = resX;
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writepxl = writepxl_1bit;
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fill = fill_chain;
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scroll = scroll_chain;
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break;
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case 2:
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/* mode 4 couleurs */
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linesize = (resX << 1);
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writepxl = writepxl_2bits;
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fill = fill_chain;
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scroll = scroll_chain;
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break;
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case 4:
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/* mode 16 couleurs */
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linesize = resX;
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writepxl = writepxl_4bits;
|
|
fill = fill_unchain;
|
|
scroll = scroll_unchain;
|
|
break;
|
|
case 8:
|
|
/* mode 256 couleurs */
|
|
if (def[5] == 0x0E) {
|
|
/* mode chainé (plus rapide mais limité en mémoire) */
|
|
linesize = (resX << 3);
|
|
writepxl = writepxl_8bits;
|
|
scroll = scroll_chain;
|
|
fill = fill_chain;
|
|
} else {
|
|
/* mode non chainé */
|
|
linesize = (resX << 1);
|
|
writepxl = writepxl_8bitsunchain;
|
|
scroll = scroll_unchain;
|
|
fill = fill_unchain;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
showchar = showchar_graphic;
|
|
pagesize = ((resY * linesize) << 3);
|
|
}
|
|
/* calcul des variables d'état video */
|
|
activepage = 0;
|
|
showedpage = 0;
|
|
splitY = 0;
|
|
vmode = mode;
|
|
scrolling = 1;
|
|
pages = (planesize / pagesize);
|
|
basemem = (def[20] << 8) + def[21] + getbase();
|
|
return 0;
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Récupère le mode vidéo en cours */
|
|
|
|
u8 getvmode()
|
|
{
|
|
return vmode;
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Charge une nouvelle police de caractère */
|
|
|
|
u32 loadfont(u8 * def, u8 size, u8 font)
|
|
{
|
|
if (graphics == 1)
|
|
return 1;
|
|
u8 oldregs[5] = { 0, 0, 0, 0, 0 };
|
|
u8 *base;
|
|
u16 i;
|
|
if (font > 7)
|
|
return 1;
|
|
if (font < 4)
|
|
base = (u8 *) (getbase() + (font << 14));
|
|
else
|
|
base = (u8 *) (getbase() + ((((font - 4) << 1) + 1) << 13));
|
|
/* sauve les anciens registres */
|
|
outb(sequencer, 2);
|
|
oldregs[0] = inb(sequencer + 1);
|
|
outb(sequencer, 4);
|
|
oldregs[1] = inb(sequencer + 1);
|
|
/* Adressage paire/impair desactivé (lineaire) */
|
|
outb(sequencer + 1, oldregs[1] | 0x04);
|
|
outb(graphics, 4);
|
|
oldregs[2] = inb(graphics + 1);
|
|
outb(graphics, 5);
|
|
oldregs[3] = inb(graphics + 1);
|
|
/* Adressage paire/impair desactivé (lineaire) */
|
|
outb(graphics + 1, oldregs[3] & ~0x10);
|
|
outb(graphics, 6);
|
|
oldregs[4] = inb(graphics + 1);
|
|
/* Adressage paire/impair desactivé (lineaire) */
|
|
outb(graphics + 1, oldregs[4] & ~0x02);
|
|
/* utilisation du plan N°2 */
|
|
useplane(2);
|
|
for (i = 0; i < 256; i++) {
|
|
memcpy(def, base + i * 32, size, 1);
|
|
def += size;
|
|
}
|
|
outb(sequencer, 2);
|
|
outb(sequencer + 1, oldregs[0]);
|
|
outb(sequencer, 4);
|
|
outb(sequencer + 1, oldregs[1]);
|
|
outb(graphics, 4);
|
|
outb(graphics + 1, oldregs[2]);
|
|
outb(graphics, 5);
|
|
outb(graphics + 1, oldregs[3]);
|
|
outb(graphics, 6);
|
|
outb(graphics + 1, oldregs[4]);
|
|
return 0;
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Récupere le N° de la police de caractère en cours d'utilisation */
|
|
|
|
u8 getfont()
|
|
{
|
|
u8 num, tmp;
|
|
outb(sequencer, 3);
|
|
tmp = inb(sequencer + 1);
|
|
num = (tmp & 0x03) | ((tmp & 0x10) >> 2);
|
|
return num;
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Récupere le N° de la police de caractère en cours d'utilisation */
|
|
|
|
u8 getfont2()
|
|
{
|
|
u8 num, tmp;
|
|
outb(sequencer, 3);
|
|
tmp = inb(sequencer + 1);
|
|
num = ((tmp & 0x0C) >> 2) | ((tmp & 0x20) >> 3);
|
|
return num;
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Fixe le N° de la police de caractère a utiliser */
|
|
|
|
void setfont(u8 num)
|
|
{
|
|
num &= 0x07;
|
|
outb(sequencer, 3);
|
|
outb(sequencer + 1,
|
|
(inb(sequencer + 1) & 0xEC) | ((num & 0x03) +
|
|
((num & 0x04) << 2)));
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Fixe le N° de la police de caractère a utiliser */
|
|
|
|
void setfont2(u8 num)
|
|
{
|
|
num &= 0x07;
|
|
outb(sequencer, 3);
|
|
outb(sequencer + 1,
|
|
(inb(sequencer + 1) & 0xD3) | (((num & 0x03) << 2) +
|
|
((num & 0x04) << 3)));
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Autorise le clignotement */
|
|
|
|
void enableblink()
|
|
{
|
|
outb(ccrt, 0x10);
|
|
outb(ccrt + 1, (inb(sequencer + 1) | 0x04));
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Annule le clignotement */
|
|
|
|
void disableblink()
|
|
{
|
|
outb(ccrt, 0x10);
|
|
outb(ccrt + 1, (inb(sequencer + 1) & ~0x04));
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Envoie une série d'octet a destination d'une portion de mémoire
|
|
vers le registre spécifié */
|
|
|
|
void outreg(u16 port, u8 * src, u16 num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num; i++) {
|
|
outb(port, i);
|
|
outb(port + 1, *src++);
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Envoie une série d'octet a destination d'une portion de mémoire
|
|
vers le registre spécifié (accés data et index confondu) */
|
|
|
|
void outregsame(u16 port, u8 * src, u16 num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num; i++) {
|
|
inb(port);
|
|
outb(port, i);
|
|
outb(port, *src++);
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Récupère une série d'octet en provenance d'un registre spécifié
|
|
vers portion de mémoire */
|
|
|
|
void inreg(u16 port, u8 * src, u16 num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num; i++) {
|
|
outb(port, i);
|
|
*src++ = inb(port + 1);
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************/
|
|
|
|
/* Récupère une série d'octet en provenance d'un registre spécifié
|
|
vers portion de mémoire (accés data et index confondu) */
|
|
|
|
void inregsame(u16 port, u8 * src, u16 num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num; i++) {
|
|
inb(port);
|
|
outb(port, i);
|
|
*src++ = inb(port);
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************/
|