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Optimize putc routine to write 2 ints instead of 8 chars to uncached

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framebuffer memory. Speeds up system time of large ascii file cat
by 4x.

Inspired by:  Linux scrolling so damned fast.
This commit is contained in:
grehan 2005-03-19 01:43:29 +00:00
parent 742abaf83a
commit dd0cda0468
1 changed files with 41 additions and 14 deletions
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55
sys/powerpc/ofw/ofw_syscons.c
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@ -180,13 +180,13 @@ static u_int16_t ofwfb_static_window[ROW*COL];
static struct ofwfb_softc ofwfb_softc;
static int
static __inline int
ofwfb_background(uint8_t attr)
{
return (attr >> 4);
}
static int
static __inline int
ofwfb_foreground(uint8_t attr)
{
return (attr & 0x0f);
@ -694,25 +694,52 @@ ofwfb_putc8(video_adapter_t *adp, vm_offset_t off, uint8_t c, uint8_t a)
struct ofwfb_softc *sc;
int row;
int col;
int i, j, k;
uint8_t *addr;
u_char *p;
int i;
uint32_t *addr;
u_char *p, fg, bg;
union {
uint32_t l;
uint8_t c[4];
} ch1, ch2;
sc = (struct ofwfb_softc *)adp;
row = (off / adp->va_info.vi_width) * adp->va_info.vi_cheight;
col = (off % adp->va_info.vi_width) * adp->va_info.vi_cwidth;
p = sc->sc_font + c*sc->sc_font_height;
addr = (uint8_t *)sc->sc_addr + (row + sc->sc_ymargin)*sc->sc_stride
+ col + sc->sc_xmargin;
addr = (u_int32_t *)((int)sc->sc_addr
+ (row + sc->sc_ymargin)*sc->sc_stride
+ col + sc->sc_xmargin);
fg = ofwfb_foreground(a);
bg = ofwfb_background(a);
for (i = 0; i < sc->sc_font_height; i++) {
for (j = 0, k = 7; j < 8; j++, k--) {
if ((p[i] & (1 << k)) == 0)
*(addr + j) = ofwfb_background(a);
else
*(addr + j) = ofwfb_foreground(a);
}
addr += sc->sc_stride;
u_char fline = p[i];
/*
* Assume that there is more background than foreground
* in characters and init accordingly
*/
ch1.l = ch2.l = (bg << 24) | (bg << 16) | (bg << 8) | bg;
/*
* Calculate 2 x 4-chars at a time, and then
* write these out.
*/
if (fline & 0x80) ch1.c[0] = fg;
if (fline & 0x40) ch1.c[1] = fg;
if (fline & 0x20) ch1.c[2] = fg;
if (fline & 0x10) ch1.c[3] = fg;
if (fline & 0x08) ch2.c[0] = fg;
if (fline & 0x04) ch2.c[1] = fg;
if (fline & 0x02) ch2.c[2] = fg;
if (fline & 0x01) ch2.c[3] = fg;
addr[0] = ch1.l;
addr[1] = ch2.l;
addr += (sc->sc_stride / sizeof(u_int32_t));
}
return (0);