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Merge the main ega drawing method into the main vga planar method and

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remove the former.

All other EGA/VGA methods were already shared, with VGA-only features
mostly not used and no decisions in inner loops to optimize fof VGA,
but this method was split up because it is the only important one and
using VGA methods if possible is about twice as fast.  The speed is
mostly not from splitting to reduce branches but from doing half as
many bus accesses, so make this easier to maintain by not splitting.
There is now 1 extra branch in an inner loop where it costs less than
1% of the bus access overhead on Haswell even if the compiler schedules
it poorly.
This commit is contained in:
Bruce Evans 2017-04-21 15:12:43 +00:00
parent e9e768f7e3
commit 3df57f416b
1 changed files with 18 additions and 67 deletions
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85
sys/dev/syscons/scvgarndr.c
View File

@ -71,7 +71,6 @@ static vr_clear_t vga_pxlclear_direct;
static vr_clear_t vga_pxlclear_planar;
static vr_draw_border_t vga_pxlborder_direct;
static vr_draw_border_t vga_pxlborder_planar;
static vr_draw_t vga_egadraw;
static vr_draw_t vga_vgadraw_direct;
static vr_draw_t vga_vgadraw_planar;
static vr_set_cursor_t vga_pxlcursor_shape;
@ -524,10 +523,7 @@ vga_rndrinit(scr_stat *scp)
if (scp->sc->adp->va_info.vi_mem_model == V_INFO_MM_PLANAR) {
scp->rndr->clear = vga_pxlclear_planar;
scp->rndr->draw_border = vga_pxlborder_planar;
if (scp->sc->adp->va_type == KD_VGA)
scp->rndr->draw = vga_vgadraw_planar;
else
scp->rndr->draw = vga_egadraw;
scp->rndr->draw = vga_vgadraw_planar;
scp->rndr->draw_cursor = vga_pxlcursor_planar;
scp->rndr->blink_cursor = vga_pxlblink_planar;
scp->rndr->draw_mouse = vga_pxlmouse_planar;
@ -684,64 +680,6 @@ vga_pxlborder_planar(scr_stat *scp, int color)
outw(GDCIDX, 0x0001); /* set/reset enable */
}
static void
vga_egadraw(scr_stat *scp, int from, int count, int flip)
{
vm_offset_t d;
vm_offset_t e;
u_char *f;
u_short bg;
u_short col1, col2;
int line_width;
int i, j;
int a;
u_char c;
line_width = scp->sc->adp->va_line_width;
d = GET_PIXEL(scp, from, 1, line_width);
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
outw(GDCIDX, 0x0003); /* data rotate/function select */
outw(GDCIDX, 0x0f01); /* set/reset enable */
bg = -1;
if (from + count > scp->xsize*scp->ysize)
count = scp->xsize*scp->ysize - from;
for (i = from; count-- > 0; ++i) {
a = sc_vtb_geta(&scp->vtb, i);
if (flip) {
col1 = ((a & 0x7000) >> 4) | (a & 0x0800);
col2 = ((a & 0x8000) >> 4) | (a & 0x0700);
} else {
col1 = (a & 0x0f00);
col2 = (a & 0xf000) >> 4;
}
/* set background color in EGA/VGA latch */
if (bg != col2) {
bg = col2;
outw(GDCIDX, bg | 0x00); /* set/reset */
outw(GDCIDX, 0xff08); /* bit mask */
writeb(d, 0);
c = readb(d); /* set bg color in the latch */
}
/* foreground color */
outw(GDCIDX, col1 | 0x00); /* set/reset */
e = d;
f = &(scp->font[sc_vtb_getc(&scp->vtb, i)*scp->font_size]);
for (j = 0; j < scp->font_size; ++j, ++f) {
outw(GDCIDX, (*f << 8) | 0x08); /* bit mask */
writeb(e, 0);
e += line_width;
}
++d;
if ((i % scp->xsize) == scp->xsize - 1)
d += scp->font_size * line_width - scp->xsize;
}
outw(GDCIDX, 0x0000); /* set/reset */
outw(GDCIDX, 0x0001); /* set/reset enable */
outw(GDCIDX, 0xff08); /* bit mask */
}
static void
vga_vgadraw_direct(scr_stat *scp, int from, int count, int flip)
{
@ -809,10 +747,13 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
d = GET_PIXEL(scp, from, 1, line_width);
outw(GDCIDX, 0x0305); /* read mode 0, write mode 3 */
if (scp->sc->adp->va_type == KD_VGA) {
outw(GDCIDX, 0x0305); /* read mode 0, write mode 3 */
outw(GDCIDX, 0xff08); /* bit mask */
} else
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
outw(GDCIDX, 0x0003); /* data rotate/function select */
outw(GDCIDX, 0x0f01); /* set/reset enable */
outw(GDCIDX, 0xff08); /* bit mask */
bg = -1;
if (from + count > scp->xsize*scp->ysize)
count = scp->xsize*scp->ysize - from;
@ -829,6 +770,8 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
if (bg != col2) {
bg = col2;
outw(GDCIDX, bg | 0x00); /* set/reset */
if (scp->sc->adp->va_type != KD_VGA)
outw(GDCIDX, 0xff08); /* bit mask */
writeb(d, 0xff);
c = readb(d); /* set bg color in the latch */
}
@ -837,14 +780,22 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
e = d;
f = &(scp->font[sc_vtb_getc(&scp->vtb, i)*scp->font_size]);
for (j = 0; j < scp->font_size; ++j, ++f) {
writeb(e, *f);
if (scp->sc->adp->va_type == KD_VGA)
writeb(e, *f);
else {
outw(GDCIDX, (*f << 8) | 0x08); /* bit mask */
writeb(e, 0);
}
e += line_width;
}
++d;
if ((i % scp->xsize) == scp->xsize - 1)
d += scp->font_size * line_width - scp->xsize;
}
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
if (scp->sc->adp->va_type == KD_VGA)
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
else
outw(GDCIDX, 0xff08); /* bit mask */
outw(GDCIDX, 0x0000); /* set/reset */
outw(GDCIDX, 0x0001); /* set/reset enable */
}