/*
** VESA 2.0 has a PM function for VESA_DISP_START
** Bad news: register values are incompatible with
** real mode function. PM adaption should be done
*/
int _GrViDrvVESAvirtualScroll(GrVideoMode *md,int x,int y,int result[2])
{
Int86Regs r;
sttzero(&r);
IREG_AX(r) = VESA_FUNC + VESA_DISP_START;
IREG_BX(r) = 0;
IREG_CX(r) = x;
IREG_DX(r) = y;
int10(&r);
if(IREG_AX(r) == VESA_SUCCESS) {
IREG_AX(r) = VESA_FUNC + VESA_DISP_START;
IREG_BX(r) = 1;
int10(&r);
result[0] = IREG_CX(r);
result[1] = IREG_DX(r);
return(TRUE);
}
return(FALSE);
}
void _GrViDrvLoadColorEGA4(int c,int r,int g,int b)
{
Int86Regs rg;
sttzero(&rg);
IREG_AX(rg) = 0x1000;
IREG_BX(rg) = c & 0x0f;
IREG_BX(rg) |= ((r & 0x40) << 7) | ((r & 0x80) << 3);
IREG_BX(rg) |= ((g & 0x40) << 6) | ((g & 0x80) << 2);
IREG_BX(rg) |= ((b & 0x40) << 5) | ((b & 0x80) << 1);
int10(&rg);
}
static void
VGA_close(PSD psd)
{
#if ELKS
/* allow console switching again*/
ioctl(0, DCREL_GRAPH);
#endif
#if HWINIT
ega_hwterm();
#else
/* init bios 80x25 text mode*/
int10(FNTEXT, 0);
#endif
}
int _GrViDrvVESAsetVirtualSize(GrVideoMode *md,int w,int h,GrVideoMode *result)
{
Int86Regs r;
sttzero(&r);
IREG_AX(r) = VESA_FUNC + VESA_SCAN_LNLEN;
IREG_BX(r) = 0;
IREG_CX(r) = w;
int10(&r);
if(IREG_AX(r) == VESA_SUCCESS) {
result->lineoffset = IREG_BX(r);
result->width = IREG_CX(r);
result->height = umin(IREG_DX(r),h);
return(TRUE);
}
return(FALSE);
}
/* init PC ROM routines, must be called in graphics mode*/
void
pcrom_init(PSD psd)
{
char * p;
/* use INT 10h to get address of rom character table*/
rom_char_addr = int10(FNGETROMADDR, GETROM8x14);
#if 0
/* check bios data area for actual character height,
* as the returned font isn't always 14 high
*/
ROM_CHAR_HEIGHT = GETBYTE_FP(MK_FP(0x0040, 0x0085));
if(ROM_CHAR_HEIGHT > MAX_ROM_HEIGHT)
ROM_CHAR_HEIGHT = MAX_ROM_HEIGHT;
#endif
p = getenv("CHARHEIGHT");
if(p)
ROM_CHAR_HEIGHT = atoi(p);
}
static PSD
VGA_open(PSD psd)
{
#if _MINIX
int s;
struct mio_ldt86 mldt86;
struct segdesc_s { /* segment descriptor for protected mode */
u16_t limit_low;
u16_t base_low;
u8_t base_middle;
u8_t access; /* |P|DL|1|X|E|R|A| */
u8_t granularity; /* |G|X|0|A|LIMT| */
u8_t base_high;
} *dp;
int fd;
unsigned long vidmem = 0xA0000;
fd = open("/dev/mem", O_RDONLY);
dp = (struct segdesc_s *) mldt86.entry;
mldt86.idx = 1;
s = ioctl(fd, MIOCGLDT86, &mldt86);
dp->limit_low = 0xFFFF;
dp->base_low = (vidmem >> 0) & 0xFFFF;
dp->base_middle = (vidmem >> 16) & 0xFF;
dp->base_high = (vidmem >> 24) & 0xFF;
dp->granularity |= 0x80;
mldt86.idx = 2;
s = ioctl(fd, MIOCSLDT86, &mldt86);
close(fd);
#endif
/* setup operating mode from environment variable*/
if(getenv("EGAMODE"))
VGAMODE = FALSE;
else VGAMODE = TRUE;
#if ELKS
/* disallow console switching while in graphics mode*/
if(ioctl(0, DCGET_GRAPH) != 0)
return NULL;
#endif
#if HWINIT
/* enter graphics mode*/
ega_hwinit();
#else
/* init bios graphics mode*/
int10(VGAMODE? FNGR640x480: FNGR640x350, 0);
#endif
/* init driver variables depending on ega/vga mode*/
psd->xres = psd->xvirtres = 640;
psd->yres = psd->yvirtres = VGAMODE? 480: 350;
psd->planes = 4;
psd->bpp = 4;
psd->ncolors = 16;
psd->pixtype = MWPF_PALETTE;
#if HAVEBLIT
psd->flags = PSF_SCREEN | PSF_HAVEBLIT;
#else
psd->flags = PSF_SCREEN;
#endif
/* init planes driver (sets psd->addr and psd->linelen)*/
ega_init(psd);
#if ROMFONT
/* init pc rom font routines*/
pcrom_init(psd);
#endif
#if 0
ROM_CHAR_HEIGHT = VGAMODE? 16: 14;
#endif
/* FIXME: add palette code*/
return psd;
}