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Overload the generic "copyrows" function by a private one which implents

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a "fast scroll" by setting the display start in memory.
(Only implemented for "scroll up" because this is more used. "scroll down"
is easy to add.)
This moves the semantics of "copyrows" to something like "moverows";
the contents of the new visible lines at the bottom is undefined.
The emulations can live without the original "copy" semantics.
This commit is contained in:
drochner 1998-07-24 16:20:14 +00:00
parent 7764b57db5
commit 3d545acb51
1 changed files with 70 additions and 5 deletions
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75
sys/dev/ic/vga.c
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@ -1,4 +1,4 @@
/* $NetBSD: vga.c,v 1.7 1998/06/26 21:05:20 drochner Exp $ */
/* $NetBSD: vga.c,v 1.8 1998/07/24 16:20:14 drochner Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
@ -59,6 +59,8 @@ struct vgascreen {
int fontset;
/* font data */
/* palette */
int mindispoffset, maxdispoffset;
};
struct vga_config {
@ -84,6 +86,7 @@ void vga_init __P((struct vga_config *, bus_space_tag_t,
bus_space_tag_t));
static int vga_alloc_attr __P((void *, int, int, int, long *));
void vga_copyrows __P((void *, int, int, int));
const struct wsdisplay_emulops vga_emulops = {
pcdisplay_cursor,
@ -91,7 +94,7 @@ const struct wsdisplay_emulops vga_emulops = {
pcdisplay_putchar,
pcdisplay_copycols,
pcdisplay_erasecols,
pcdisplay_copyrows,
vga_copyrows,
pcdisplay_eraserows,
vga_alloc_attr
};
@ -261,13 +264,15 @@ vga_init_screen(vc, scr, type, existing, attrp)
int existing;
long *attrp;
{
int cpos = 0;
int cpos;
int res;
scr->cfg = vc;
scr->pcs.hdl = (struct pcdisplay_handle *)&vc->hdl;
scr->pcs.type = type;
scr->pcs.active = 0;
scr->mindispoffset = 0;
scr->maxdispoffset = 0x8000 - type->nrows * type->ncols * 2;
if (existing) {
cpos = vga_6845_read(&vc->hdl, cursorh) << 8;
@ -276,6 +281,17 @@ vga_init_screen(vc, scr, type, existing, attrp)
/* make sure we have a valid cursor position */
if (cpos < 0 || cpos >= type->nrows * type->ncols)
cpos = 0;
scr->pcs.dispoffset = vga_6845_read(&vc->hdl, startadrh) << 9;
scr->pcs.dispoffset |= vga_6845_read(&vc->hdl, startadrl) << 1;
/* make sure we have a valid memory offset */
if (scr->pcs.dispoffset < scr->mindispoffset ||
scr->pcs.dispoffset > scr->maxdispoffset)
scr->pcs.dispoffset = scr->mindispoffset;
} else {
cpos = 0;
scr->pcs.dispoffset = scr->mindispoffset;
}
scr->pcs.vc_crow = cpos / type->ncols;
@ -549,7 +565,7 @@ vga_show_screen(v, cookie)
for (i = 0; i < oldtype->ncols * oldtype->nrows; i++)
oldscr->pcs.mem[i] = bus_space_read_2(vh->vh_memt, vh->vh_memh,
i * 2);
oldscr->pcs.dispoffset + i * 2);
if (oldtype != type)
vga_setscreentype(vh, type);
@ -557,9 +573,16 @@ vga_show_screen(v, cookie)
vga_setfontset(vh, scr->fontset);
/* swich colours */
scr->pcs.dispoffset = scr->mindispoffset;
if (scr->pcs.dispoffset != oldscr->pcs.dispoffset) {
vga_6845_write(vh, startadrh, scr->pcs.dispoffset >> 9);
vga_6845_write(vh, startadrl, scr->pcs.dispoffset >> 1);
}
for (i = 0; i < type->ncols * type->nrows; i++)
bus_space_write_2(vh->vh_memt, vh->vh_memh,
i * 2, scr->pcs.mem[i]);
scr->pcs.dispoffset + i * 2,
scr->pcs.mem[i]);
scr->pcs.active = 1;
vc->active = scr;
@ -621,3 +644,45 @@ vga_alloc_attr(id, fg, bg, flags, attrp)
*attrp |= FG_BLINK;
return (0);
}
void
vga_copyrows(id, srcrow, dstrow, nrows)
void *id;
int srcrow, dstrow, nrows;
{
struct vgascreen *scr = id;
bus_space_tag_t memt = scr->pcs.hdl->ph_memt;
bus_space_handle_t memh = scr->pcs.hdl->ph_memh;
int ncols = scr->pcs.type->ncols;
bus_size_t srcoff, dstoff;
srcoff = srcrow * ncols + 0;
dstoff = dstrow * ncols + 0;
if (scr->pcs.active) {
if (dstrow == 0 && (srcrow + nrows == scr->pcs.type->nrows)) {
/* scroll up whole screen */
if ((scr->pcs.dispoffset + srcrow * ncols * 2)
<= scr->maxdispoffset) {
scr->pcs.dispoffset += srcrow * ncols * 2;
} else {
bus_space_copy_region_2(memt, memh,
scr->pcs.dispoffset + srcoff * 2,
memh, scr->mindispoffset,
nrows * ncols);
scr->pcs.dispoffset = scr->mindispoffset;
}
vga_6845_write(&scr->cfg->hdl, startadrh,
scr->pcs.dispoffset >> 9);
vga_6845_write(&scr->cfg->hdl, startadrl,
scr->pcs.dispoffset >> 1);
} else {
bus_space_copy_region_2(memt, memh,
scr->pcs.dispoffset + srcoff * 2,
memh, scr->pcs.dispoffset + dstoff * 2,
nrows * ncols);
}
} else
bcopy(&scr->pcs.mem[srcoff], &scr->pcs.mem[dstoff],
nrows * ncols * 2);
}