Erik,
Thanks for your speedy assistance! I think the two things are closely
interrrelated via the global variable hardscreen. Reverting this file
solved the problem. I wouldn't be surprised if there were something
weird about Parallels' MTRR support, and since this isn't the current
version it's not likely to get any better. If anyone's using Parallels
4 and not running into this issue, I'd love to know.
Also, are the old sources available online somewhere so I can do this
kind of diff in the future on my own?
Thanks again,
On Aug 2, 2009, at 11:06 AM, erik quanstrom wrote:
On Sun Aug 2 05:39:10 EDT 2009, fus...@storytotell.org wrote:
Hi,
I installed Plan 9 under Parallels 3 back in November of last year
and
it worked without a hitch. I tried to install another copy tonight
and
the bitmapped display isn't working in the new one, I just get a pure
black screen after any aux/vga command that it thinks will succeed. I
found I can reproduce that behavior by building and running a new
kernel in the old install. Any ideas what has happened since November
in the kernel with respect to Vesa and Parallels? I'd be more than
happy to debug this issue if I could get a little guidance. I didn't
see anything in the archives about this problem. Alternatively, does
anyone know if Parallels 4 works with a current kernel? If so I'll
probably just upgrade to that; I've been holding off for a good
reason
to.
two things: mtrr and adding a vesaflush command. it doesn't quite
make
sense to me that this would break parallels, unless there is something
funky about
- mtrr ranges with parallels.
- parallels vesa
- plan 9 vesa support
the easiest thing to do would be to comment out vesaflush and
see what happens. without pawing through the standard, it may
be that vesaflush is optionally supported and parallels doesn't
support it.
- erik
; diff -c vgavesa.c /n/sourcesdump/2008/1101/plan9/sys/src/9/pc/
vgavesa.c
vgavesa.c:13,21 - /n/sourcesdump/2008/1101/plan9/sys/src/9/pc/
vgavesa.c:13,18
#include <cursor.h>
#include "screen.h"
-
- static void *hardscreen;
-
#define WORD(p) ((p)[0] | ((p)[1]<<8))
#define LONG(p) ((p)[0] | ((p)[1]<<8) | ((p)[2]<<16) | ((p)[3]<<24))
#define PWORD(p, v) (p)[0] = (v); (p)[1] = (v)>>8
vgavesa.c:83,89 - /n/sourcesdump/2008/1101/plan9/sys/src/9/pc/
vgavesa.c:80,86
}
static void
- vesalinear(VGAscr *, int, int)
+ vesalinear(VGAscr* scr, int, int)
{
int i, mode, size;
uchar *p;
vgavesa.c:130,169 - /n/sourcesdump/2008/1101/plan9/sys/src/9/pc/
vgavesa.c:127,135
size = ROUND(size, 1024*1024);
havesize:
- if(size > 16*1024*1024) /* probably arbitrary; could
increase */
- size = 16*1024*1024;
- hardscreen = vmap(paddr, size);
- mtrr(paddr, size, "wc");
- // vgalinearaddr(scr, paddr, size);
+ vgalinearaddr(scr, paddr, size);
}
- static void
- vesaflush(VGAscr *scr, Rectangle r)
- {
- int t, w, wid, off;
- ulong *hp, *sp, *esp;
-
- if(rectclip(&r, scr->gscreen->r) == 0)
- return;
-
- hp = hardscreen;
- sp = (ulong*)(scr->gscreendata->bdata + scr->gscreen->zero);
- t = (r.max.x * scr->gscreen->depth + 2*BI2WD-1) / BI2WD;
- w = (r.min.x * scr->gscreen->depth) / BI2WD;
- w = (t - w) * BY2WD;
- wid = scr->gscreen->width;
- off = r.min.y * wid + (r.min.x * scr->gscreen->depth) / BI2WD;
-
- hp += off;
- sp += off;
- esp = sp + Dy(r) * wid;
- while(sp < esp){
- memmove(hp, sp, w);
- hp += wid;
- sp += wid;
- }
- }
-
VGAdev vgavesadev = {
"vesa",
0,
vgavesa.c:174,178 - /n/sourcesdump/2008/1101/plan9/sys/src/9/pc/
vgavesa.c:140,145
0,
0,
0,
- vesaflush,
+ 0,
};
—
Daniel Lyons
