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/*
* vga driver using just vesa bios to set up.
*
* note that setting hwaccel to zero will cause cursor ghosts to be
* left behind. hwaccel set non-zero repairs this.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "ureg.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
enum {
Usesoftscreen = 1,
};
static void *hardscreen;
static uchar modebuf[0x1000];
#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
#define PLONG(p, v) (p)[0] = (v); (p)[1] = (v)>>8; (p)[2] = (v)>>16; (p)[3] = (v)>>24
static uchar*
vbesetup(Ureg *u, int ax)
{
ulong pa;
pa = PADDR(RMBUF);
memset(modebuf, 0, sizeof modebuf);
memset(u, 0, sizeof *u);
u->ax = ax;
u->es = (pa>>4)&0xF000;
u->di = pa&0xFFFF;
return modebuf;
}
static void
vbecall(Ureg *u)
{
Chan *creg, *cmem;
ulong pa;
cmem = namec("/dev/realmodemem", Aopen, ORDWR, 0);
if(waserror()){
cclose(cmem);
nexterror();
}
creg = namec("/dev/realmode", Aopen, ORDWR, 0);
if(waserror()){
cclose(creg);
nexterror();
}
pa = PADDR(RMBUF);
/* TODO: check read and write return values */
devtab[cmem->type]->write(cmem, modebuf, sizeof modebuf, pa);
u->trap = 0x10;
devtab[creg->type]->write(creg, u, sizeof *u, 0);
devtab[creg->type]->read(creg, u, sizeof *u, 0);
if((u->ax&0xFFFF) != 0x004F)
error("vesa bios error");
devtab[cmem->type]->read(cmem, modebuf, sizeof modebuf, pa);
poperror();
cclose(creg);
poperror();
cclose(cmem);
}
static void
vbecheck(void)
{
Ureg u;
uchar *p;
p = vbesetup(&u, 0x4F00);
strcpy((char*)p, "VBE2");
vbecall(&u);
if(memcmp((char*)p, "VESA", 4) != 0)
error("bad vesa signature");
if(p[5] < 2)
error("bad vesa version");
}
static int
vbegetmode(void)
{
Ureg u;
vbesetup(&u, 0x4F03);
vbecall(&u);
return u.bx;
}
static uchar*
vbemodeinfo(int mode)
{
uchar *p;
Ureg u;
p = vbesetup(&u, 0x4F01);
u.cx = mode;
vbecall(&u);
return p;
}
static void
vesalinear(VGAscr *scr, int, int)
{
int i, mode, size, havesize;
uchar *p;
ulong paddr;
Pcidev *pci;
if(hardscreen) {
scr->vaddr = 0;
scr->paddr = scr->apsize = 0;
return;
}
vbecheck();
mode = vbegetmode();
/*
* bochs loses the top bits - cannot use this
if((mode&(1<<14)) == 0)
error("not in linear graphics mode");
*/
mode &= 0x3FFF;
p = vbemodeinfo(mode);
if(!(WORD(p+0) & (1<<4)))
error("not in VESA graphics mode");
if(!(WORD(p+0) & (1<<7)))
error("not in linear graphics mode");
paddr = LONG(p+40);
size = WORD(p+20)*WORD(p+16);
size = PGROUND(size);
/*
* figure out max size of memory so that we have
* enough if the screen is resized.
*/
pci = nil;
havesize = 0;
while(!havesize && (pci = pcimatch(pci, 0, 0)) != nil){
if(pci->ccrb != Pcibcdisp)
continue;
for(i=0; i<nelem(pci->mem); i++)
if(paddr == (pci->mem[i].bar&~0x0F)){
if(pci->mem[i].size > size)
size = pci->mem[i].size;
havesize = 1;
break;
}
}
/* no pci - heuristic guess */
if (!havesize)
if(size < 4*1024*1024)
size = 4*1024*1024;
else
size = ROUND(size, 1024*1024);
if(size > 16*1024*1024) /* arbitrary */
size = 16*1024*1024;
vgalinearaddr(scr, paddr, size);
if(scr->apsize)
addvgaseg("vesascreen", scr->paddr, scr->apsize);
if(Usesoftscreen){
hardscreen = scr->vaddr;
scr->vaddr = 0;
scr->paddr = scr->apsize = 0;
}
}
static void
vesaflush(VGAscr *scr, Rectangle r)
{
int t, w, wid, off;
ulong *hp, *sp, *esp;
if(hardscreen == nil)
return;
if(rectclip(&r, scr->gscreen->r) == 0)
return;
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 = hardscreen;
hp += off;
sp += off;
esp = sp + Dy(r) * wid;
while(sp < esp){
memmove(hp, sp, w);
hp += wid;
sp += wid;
}
}
VGAdev vgavesadev = {
"vesa",
0,
0,
0,
vesalinear,
0,
0,
0,
0,
vesaflush,
};
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