newport_con.c

来自「讲述linux的初始化过程」· C语言 代码 · 共 615 行 · 第 1/2 页

{
    int xend = ((sx + width) << 3) - 1;
    int ystart = ((sy << 4) + topscan) & 0x3ff;
    int yend = (((sy + height) << 4) + topscan - 1) & 0x3ff;

    if (logo_active)
	return;
    
    if (ystart < yend) {
	newport_clear_screen(sx << 3, ystart, xend, yend,
			     (vc->vc_color & 0xf0) >> 4);
    } else {
	newport_clear_screen(sx << 3, ystart, xend, 1023,
			     (vc->vc_color & 0xf0) >> 4);
	newport_clear_screen(sx << 3, 0, xend, yend,
			     (vc->vc_color & 0xf0) >> 4);
    }
}

static void newport_putc(struct vc_data *vc, int charattr, int ypos, int xpos)
{
    unsigned char *p;
    
    p = &FONT_DATA[(charattr & 0xff) << 4];
    charattr = (charattr >> 8) & 0xff;
    xpos <<= 3;
    ypos <<= 4;

    newport_render_background(xpos, ypos, xpos, ypos, (charattr & 0xf0) >> 4);
    
    /* Set the color and drawing mode. */
    newport_wait();
    npregs->set.colori = charattr & 0xf;
    npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
			     NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
			     NPORT_DMODE0_L32);
    
    /* Set coordinates for bitmap operation. */
    npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
    npregs->set.xyendi = ((xpos + 7) << 16);
    newport_wait();
    
    /* Go, baby, go... */
    RENDER(npregs, p);
}

static void newport_putcs(struct vc_data *vc, const unsigned short *s,
			  int count, int ypos, int xpos)
{
    int i;
    int charattr;
    unsigned char *p; 

    charattr = (*s >> 8) & 0xff;

    xpos <<= 3;
    ypos <<= 4;

    if (!logo_active)
	/* Clear the area behing the string */
	newport_render_background(xpos, ypos, xpos + ((count-1) << 3), ypos,
				  (charattr & 0xf0) >> 4);

    newport_wait();

    /* Set the color and drawing mode. */
    npregs->set.colori = charattr & 0xf;
    npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
			     NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
			     NPORT_DMODE0_L32);
    
    for (i = 0; i < count; i++, xpos += 8) {
	p = &FONT_DATA[(s[i] & 0xff) << 4];

	newport_wait();

	/* Set coordinates for bitmap operation. */
	npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
	npregs->set.xyendi = ((xpos + 7) << 16);

	/* Go, baby, go... */
	RENDER(npregs, p);
    }
}

static void newport_cursor(struct vc_data *vc, int mode)
{
    unsigned short treg;
    int xcurs, ycurs;
    
    switch (mode) {
     case CM_ERASE:
	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
	newport_vc2_set(npregs, VC2_IREG_CONTROL, (treg & ~(VC2_CTRL_ECDISP)));
	break;

     case CM_MOVE:
     case CM_DRAW:
	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
	newport_vc2_set(npregs, VC2_IREG_CONTROL, (treg | VC2_CTRL_ECDISP));
	xcurs = (vc->vc_pos - vc->vc_visible_origin) / 2;
	ycurs = ((xcurs / vc->vc_cols) << 4) + 31;
	xcurs = ((xcurs % vc->vc_cols) << 3) + xcurs_correction;
	newport_vc2_set(npregs, VC2_IREG_CURSX, xcurs);
	newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
    }
}

static int newport_switch(struct vc_data *vc)
{
    static int logo_drawn = 0;

    topscan = 0;
    npregs->cset.topscan = 0x3ff;

    if (!logo_drawn) {
	newport_show_logo();
	logo_drawn = 1;
	logo_active = 1;
    }

    return 1;
}

static int newport_blank(struct vc_data *c, int blank)
{
    unsigned short treg;
    
    if (blank == 0) {
	/* unblank console */
	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
	newport_vc2_set(npregs, VC2_IREG_CONTROL, (treg | VC2_CTRL_EDISP));
    } else {
	/* blank console */
	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
	newport_vc2_set(npregs, VC2_IREG_CONTROL, (treg & ~(VC2_CTRL_EDISP)));
    }
    return 1;
}

static int newport_font_op(struct vc_data *vc, struct console_font_op *f)
{
    return -ENOSYS;
}

static int newport_set_palette(struct vc_data *vc, unsigned char *table)
{
    return -EINVAL;
}

static int newport_scrolldelta(struct vc_data *vc, int lines)
{
    /* there is (nearly) no off-screen memory, so we can't scroll back */
    return 0;
}

static int newport_scroll(struct vc_data *vc, int t, int b, int dir, int lines)
{
    int count,x,y;
    unsigned short *s, *d;
    unsigned short chattr;

    logo_active = 0;	/* it's time to disable the logo now.. */

    if (t == 0 && b == vc->vc_rows) {
	if (dir == SM_UP) {
	    topscan = (topscan + (lines << 4)) & 0x3ff;
	    newport_clear_lines (vc->vc_rows-lines,vc->vc_rows-1,
				 (vc->vc_color & 0xf0) >> 4);
	} else {
	    topscan = (topscan + (-lines << 4)) & 0x3ff;
	    newport_clear_lines (0,lines-1, (vc->vc_color & 0xf0) >> 4);
	}
	npregs->cset.topscan = (topscan - 1) & 0x3ff;
	return 0;
    }
    
    count = (b-t-lines) * vc->vc_cols;
    if (dir == SM_UP) {
	x = 0; y = t;
	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row*(t+lines));
	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row*t);
	while (count--) {
	    chattr = scr_readw (s++);
	    if (chattr != scr_readw(d)) {
		newport_putc (vc, chattr, y, x);
		scr_writew (chattr, d);
	    }
	    d++;
	    if (++x == vc->vc_cols) {
		x = 0; y++;
	    }
	}
	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row*(b-lines));
	x = 0; y = b-lines;
	for (count = 0; count < (lines * vc->vc_cols); count++) {
	    if (scr_readw(d) != vc->vc_video_erase_char) {
		newport_putc (vc, vc->vc_video_erase_char, y, x);
		scr_writew (vc->vc_video_erase_char, d);
	    }
	    d++;
	    if (++x == vc->vc_cols) {
		x = 0; y++;
	    }
	}
    } else {
	x = vc->vc_cols-1; y = b-1;
	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row*(b-lines)-2);
	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row*b-2);
	while (count--) {
	    chattr = scr_readw (s--);
	    if (chattr != scr_readw(d)) {
		newport_putc (vc, chattr, y, x);
		scr_writew (chattr, d);
	    }
	    d--;
	    if (x-- == 0) {
		x = vc->vc_cols-1; y--;
	    }
	}
	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row*t);
	x = 0; y = t;
	for (count = 0; count < (lines * vc->vc_cols); count++) {
	    if (scr_readw(d) != vc->vc_video_erase_char) {
		newport_putc (vc, vc->vc_video_erase_char, y, x);
		scr_writew (vc->vc_video_erase_char, d);
	    }
	    d++;
	    if (++x == vc->vc_cols) {
		x = 0; y++;
	    }
	}
    }
    return 1;
}

static void newport_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx, int h, int w)
{
    short xs, ys, xe, ye, xoffs, yoffs, tmp;

    xs = sx << 3; xe = ((sx+w) << 3)-1;
    /*
     * as bmove is only used to move stuff around in the same line
     * (h == 1), we don't care about wrap arounds caused by topscan != 0
     */
    ys = ((sy << 4) + topscan) & 0x3ff; ye = (((sy+h) << 4)-1+topscan) & 0x3ff;
    xoffs = (dx - sx) << 3;
    yoffs = (dy - sy) << 4;
    if (xoffs > 0) {
	/* move to the right, exchange starting points */
	tmp = xe; xe = xs; xs = tmp;
    }
    newport_wait();
    npregs->set.drawmode0 = (NPORT_DMODE0_S2S | NPORT_DMODE0_BLOCK |
			     NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX |
			     NPORT_DMODE0_STOPY);
    npregs->set.xystarti = (xs << 16) | ys;
    npregs->set.xyendi = (xe << 16) | ye;
    npregs->go.xymove = (xoffs << 16) | yoffs;
}

static int newport_dummy(struct vc_data *c)
{
    return 0;
}

#define DUMMY (void *) newport_dummy

const struct consw newport_con = {
    con_startup:	newport_startup,
    con_init:		newport_init,
    con_deinit:		DUMMY,
    con_clear:		newport_clear,
    con_putc:		newport_putc,
    con_putcs:		newport_putcs,
    con_cursor:		newport_cursor,
    con_scroll:		newport_scroll,
    con_bmove:		newport_bmove,
    con_switch:		newport_switch,
    con_blank:		newport_blank,
    con_font_op:	newport_font_op,
    con_set_palette:	newport_set_palette,
    con_scrolldelta:	newport_scrolldelta,
    con_set_origin:	DUMMY,
    con_save_screen:	DUMMY,
};

#ifdef MODULE

int init_module(void) {
    if (!newport_startup()) 
       printk("Error loading SGI Newport Console driver\n");
    else 
       printk("Loading SGI Newport Console Driver\n");

    take_over_console(&newport_con,0,MAX_NR_CONSOLES-1,1);

    return 0;
}

int cleanup_module(void) {
    printk("Unloading SGI Newport Console Driver\n");
    return 0;
}

#endif