#include <u.h>
#include <libc.h>
#include <bio.h>
#include </386/include/ureg.h>
typedef struct Ureg Ureg;
#include "pci.h"
#include "vga.h"
typedef struct Vbe Vbe;
typedef struct Vmode Vmode;
typedef struct Modelist Modelist;
typedef struct Edid Edid;
enum
{
MemSize = 1024*1024,
PageSize = 4096,
RealModeBuf = 0x9000,
};
struct Vbe
{
int rmfd; /* /dev/realmode */
int memfd; /* /dev/realmem */
uchar *mem; /* copy of memory; 1MB */
uchar *isvalid; /* 1byte per 4kB in mem */
uchar *buf;
uchar *modebuf;
};
struct Vmode
{
char name[32];
char chan[32];
int id;
int attr; /* flags */
int bpl;
int dx, dy;
int depth;
char *model;
int r, g, b, x;
int ro, go, bo, xo;
int directcolor; /* flags */
ulong paddr;
};
struct Edid {
char mfr[4]; /* manufacturer */
char serialstr[16]; /* serial number as string (in extended data) */
char name[16]; /* monitor name as string (in extended data) */
ushort product; /* product code, 0 = unused */
ulong serial; /* serial number, 0 = unused */
uchar version; /* major version number */
uchar revision; /* minor version number */
uchar mfrweek; /* week of manufacture, 0 = unused */
int mfryear; /* year of manufacture, 0 = unused */
uchar dxcm; /* horizontal image size in cm. */
uchar dycm; /* vertical image size in cm. */
int gamma; /* gamma*100 */
int rrmin; /* minimum vertical refresh rate */
int rrmax; /* maximum vertical refresh rate */
int hrmin; /* minimum horizontal refresh rate */
int hrmax; /* maximum horizontal refresh rate */
ulong pclkmax; /* maximum pixel clock */
int flags;
Modelist *modelist; /* list of supported modes */
};
struct Modelist
{
Mode;
Modelist *next;
};
enum {
Fdigital = 1<<0, /* is a digital display */
Fdpmsstandby = 1<<1, /* supports DPMS standby mode */
Fdpmssuspend = 1<<2, /* supports DPMS suspend mode */
Fdpmsactiveoff = 1<<3, /* supports DPMS active off mode */
Fmonochrome = 1<<4, /* is a monochrome display */
Fgtf = 1<<5, /* supports VESA GTF: see /public/doc/vesa/gtf10.pdf */
};
#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 Vbe *vbe;
static Edid edid;
Vbe *mkvbe(void);
int vbecheck(Vbe*);
uchar *vbemodes(Vbe*);
int vbemodeinfo(Vbe*, int, Vmode*);
int vbegetmode(Vbe*);
int vbesetmode(Vbe*, int);
void vbeprintinfo(Vbe*);
void vbeprintmodeinfo(Vbe*, int, char*);
int vbesnarf(Vbe*, Vga*);
void vesaddc(void);
int vbeddcedid(Vbe *vbe, Edid *e);
void printedid(Edid*);
int
dbvesa(Vga* vga)
{
vbe = mkvbe();
if(vbe == nil){
fprint(2, "mkvbe: %r\n");
return 0;
}
if(vbecheck(vbe) < 0){
fprint(2, "dbvesa: %r\n");
return 0;
}
vga->link = alloc(sizeof(Ctlr));
*vga->link = vesa;
vga->vesa = vga->link;
vga->ctlr = vga->link;
vga->link->link = alloc(sizeof(Ctlr));
*vga->link->link = softhwgc;
vga->hwgc = vga->link->link;
return 1;
}
Mode*
dbvesamode(char *mode)
{
int i;
uchar *p, *ep;
Vmode vm;
Mode *m;
if(vbe == nil)
return nil;
p = vbemodes(vbe);
if(p == nil)
return nil;
for(ep=p+1024; (p[0]!=0xFF || p[1]!=0xFF) && p<ep; p+=2){
if(vbemodeinfo(vbe, WORD(p), &vm) < 0)
continue;
if(strcmp(vm.name, mode) == 0)
goto havemode;
}
if(1){
fprint(2, "warning: scanning for unoffered vesa modes\n");
for(i=0x100; i<0x200; i++){
if(vbemodeinfo(vbe, i, &vm) < 0)
continue;
if(strcmp(vm.name, mode) == 0)
goto havemode;
}
}
werrstr("no such vesa mode");
return nil;
havemode:
m = alloc(sizeof(Mode));
strcpy(m->type, "vesa");
strcpy(m->size, vm.name);
strcpy(m->chan, vm.chan);
m->frequency = 100;
m->x = vm.dx;
m->y = vm.dy;
m->z = vm.depth;
m->ht = m->x;
m->shb = m->x;
m->ehb = m->x;
m->shs = m->x;
m->ehs = m->x;
m->vt = m->y;
m->vrs = m->y;
m->vre = m->y;
m->attr = alloc(sizeof(Attr));
m->attr->attr = "id";
m->attr->val = alloc(32);
sprint(m->attr->val, "0x%x", vm.id);
return m;
}
static void
snarf(Vga* vga, Ctlr* ctlr)
{
if(!vbe)
vbe = mkvbe();
if(vbe)
vga->vesa = ctlr;
vbesnarf(vbe, vga);
vga->linear = 1;
ctlr->flag |= Hlinear|Ulinear;
}
static void
load(Vga* vga, Ctlr* ctlr)
{
if(vbe == nil)
error("no vesa bios\n");
if(vbesetmode(vbe, atoi(dbattr(vga->mode->attr, "id"))) < 0){
ctlr->flag |= Ferror;
fprint(2, "vbesetmode: %r\n");
}
}
static void
dump(Vga*, Ctlr*)
{
int i;
char did[0x200];
uchar *p, *ep;
if(!vbe){
Bprint(&stdout, "no vesa bios\n");
return;
}
memset(did, 0, sizeof did);
vbeprintinfo(vbe);
p = vbemodes(vbe);
if(p){
for(ep=p+1024; (p[0]!=0xFF || p[1]!=0xFF) && p<ep; p+=2){
vbeprintmodeinfo(vbe, WORD(p), "");
if(WORD(p) < nelem(did))
did[WORD(p)] = 1;
}
}
for(i=0x100; i<0x1FF; i++)
if(!did[i])
vbeprintmodeinfo(vbe, i, " (unoffered)");
if(vbeddcedid(vbe, &edid) < 0)
fprint(2, "warning: reading edid: %r\n");
else
printedid(&edid);
}
Ctlr vesa = {
"vesa", /* name */
snarf, /* snarf */
0, /* options */
0, /* init */
load, /* load */
dump, /* dump */
};
Ctlr softhwgc = {
"soft",
};
/*
* VESA bios extension
*/
typedef struct Flag Flag;
struct Flag {
int bit;
char *desc;
};
static Flag capabilityflag[] = {
0x01, "8-bit-dac",
0x02, "not-vga",
0x04, "ramdac-needs-blank",
0x08, "stereoscopic",
0x10, "stereo-evc",
0
};
static Flag modeattributesflags[] = {
1<<0, "supported",
1<<2, "tty",
1<<3, "color",
1<<4, "graphics",
1<<5, "not-vga",
1<<6, "no-windowed-vga",
1<<7, "linear",
1<<8, "double-scan",
1<<9, "interlace",
1<<10, "triple-buffer",
1<<11, "stereoscopic",
1<<12, "dual-start-addr",
0
};
static Flag winattributesflags[] = {
1<<0, "relocatable",
1<<1, "readable",
1<<2, "writeable",
0
};
static Flag directcolorflags[] = {
1<<0, "programmable-color-ramp",
1<<1, "x-usable",
0
};
static char *modelstr[] = {
"text", "cga", "hercules", "planar", "packed", "non-chain4", "direct", "YUV"
};
static void
printflags(Flag *f, int b)
{
int i;
for(i=0; f[i].bit; i++)
if(f[i].bit & b)
Bprint(&stdout, " %s", f[i].desc);
Bprint(&stdout, "\n");
}
Vbe*
mkvbe(void)
{
Vbe *vbe;
vbe = alloc(sizeof(Vbe));
if((vbe->rmfd = open("/dev/realmode", ORDWR)) < 0)
return nil;
if((vbe->memfd = open("/dev/realmodemem", ORDWR)) < 0)
return nil;
vbe->mem = alloc(MemSize);
vbe->isvalid = alloc(MemSize/PageSize);
vbe->buf = alloc(PageSize);
vbe->modebuf = alloc(PageSize);
return vbe;
}
static void
loadpage(Vbe *vbe, int p)
{
if(p >= MemSize/PageSize || vbe->isvalid[p])
return;
if(pread(vbe->memfd, vbe->mem+p*PageSize, PageSize, p*PageSize) != PageSize)
error("read /dev/realmodemem: %r\n");
vbe->isvalid[p] = 1;
}
static void*
unfarptr(Vbe *vbe, uchar *p)
{
int seg, off;
seg = WORD(p+2);
off = WORD(p);
if(seg==0 && off==0)
return nil;
off += seg<<4;
if(off >= MemSize)
return nil;
loadpage(vbe, off/PageSize);
loadpage(vbe, off/PageSize+1); /* just in case */
return vbe->mem+off;
}
uchar*
vbesetup(Vbe *vbe, Ureg *u, int ax)
{
memset(vbe->buf, 0, PageSize);
memset(u, 0, sizeof *u);
u->ax = ax;
u->es = (RealModeBuf>>4)&0xF000;
u->di = RealModeBuf&0xFFFF;
return vbe->buf;
}
int
vbecall(Vbe *vbe, Ureg *u)
{
u->trap = 0x10;
if(pwrite(vbe->memfd, vbe->buf, PageSize, RealModeBuf) != PageSize)
error("write /dev/realmodemem: %r\n");
if(pwrite(vbe->rmfd, u, sizeof *u, 0) != sizeof *u)
error("write /dev/realmode: %r\n");
if(pread(vbe->rmfd, u, sizeof *u, 0) != sizeof *u)
error("read /dev/realmode: %r\n");
if(pread(vbe->memfd, vbe->buf, PageSize, RealModeBuf) != PageSize)
error("read /dev/realmodemem: %r\n");
if((u->ax&0xFFFF) != 0x004F){
werrstr("VBE error %#.4lux", u->ax&0xFFFF);
return -1;
}
memset(vbe->isvalid, 0, MemSize/PageSize);
return 0;
}
int
vbecheck(Vbe *vbe)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F00);
strcpy((char*)p, "VBE2");
if(vbecall(vbe, &u) < 0)
return -1;
if(memcmp(p, "VESA", 4) != 0 || p[5] < 2){
werrstr("invalid vesa signature %.4H %.4H\n", p, p+4);
return -1;
}
return 0;
}
int
vbesnarf(Vbe *vbe, Vga *vga)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F00);
strcpy((char*)p, "VBE2");
if(vbecall(vbe, &u) < 0)
return -1;
if(memcmp(p, "VESA", 4) != 0 || p[5] < 2)
return -1;
vga->apz = WORD(p+18)*0x10000UL;
return 0;
}
void
vbeprintinfo(Vbe *vbe)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F00);
strcpy((char*)p, "VBE2");
if(vbecall(vbe, &u) < 0)
return;
printitem("vesa", "sig");
Bprint(&stdout, "%.4s %d.%d\n", (char*)p, p[5], p[4]);
if(p[5] < 2)
return;
printitem("vesa", "oem");
Bprint(&stdout, "%s %d.%d\n", unfarptr(vbe, p+6), p[21], p[20]);
printitem("vesa", "vendor");
Bprint(&stdout, "%s\n", unfarptr(vbe, p+22));
printitem("vesa", "product");
Bprint(&stdout, "%s\n", unfarptr(vbe, p+26));
printitem("vesa", "rev");
Bprint(&stdout, "%s\n", unfarptr(vbe, p+30));
printitem("vesa", "cap");
printflags(capabilityflag, p[10]);
printitem("vesa", "mem");
Bprint(&stdout, "%lud\n", WORD(p+18)*0x10000UL);
}
uchar*
vbemodes(Vbe *vbe)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F00);
strcpy((char*)p, "VBE2");
if(vbecall(vbe, &u) < 0)
return nil;
memmove(vbe->modebuf, unfarptr(vbe, p+14), 1024);
return vbe->modebuf;
}
int
vbemodeinfo(Vbe *vbe, int id, Vmode *m)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F01);
u.cx = id;
if(vbecall(vbe, &u) < 0)
return -1;
m->id = id;
m->attr = WORD(p);
m->bpl = WORD(p+16);
m->dx = WORD(p+18);
m->dy = WORD(p+20);
m->depth = p[25];
m->model = p[27] < nelem(modelstr) ? modelstr[p[27]] : "unknown";
m->r = p[31];
m->g = p[33];
m->b = p[35];
m->x = p[37];
m->ro = p[32];
m->go = p[34];
m->bo = p[36];
m->xo = p[38];
m->directcolor = p[39];
m->paddr = LONG(p+40);
snprint(m->name, sizeof m->name, "%dx%dx%d",
m->dx, m->dy, m->depth);
if(m->depth <= 8)
snprint(m->chan, sizeof m->chan, "m%d", m->depth);
else if(m->xo)
snprint(m->chan, sizeof m->chan, "x%dr%dg%db%d", m->x, m->r, m->g, m->b);
else
snprint(m->chan, sizeof m->chan, "r%dg%db%d", m->r, m->g, m->b);
return 0;
}
void
vbeprintmodeinfo(Vbe *vbe, int id, char *suffix)
{
Vmode m;
if(vbemodeinfo(vbe, id, &m) < 0){
// Bprint(&stdout, "vesa: cannot get mode 0x%ux: %r\n", id);
return;
}
printitem("vesa", "mode");
Bprint(&stdout, "0x%ux %s %s %s%s\n",
m.id, m.name, m.chan, m.model, suffix);
}
int
vbegetmode(Vbe *vbe)
{
Ureg u;
vbesetup(vbe, &u, 0x4F03);
if(vbecall(vbe, &u) < 0)
return 0;
return u.bx;
}
int
vbesetmode(Vbe *vbe, int id)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F02);
if(id != 3)
id |= 3<<14; /* graphics: use linear, do not clear */
u.bx = id;
USED(p);
/*
* can set mode specifics (ht hss hse vt vss vse 0 clockhz refreshhz):
*
u.bx |= 1<<11;
n = atoi(argv[2]); PWORD(p, n); p+=2;
n = atoi(argv[3]); PWORD(p, n); p+=2;
n = atoi(argv[4]); PWORD(p, n); p+=2;
n = atoi(argv[5]); PWORD(p, n); p+=2;
n = atoi(argv[6]); PWORD(p, n); p+=2;
n = atoi(argv[7]); PWORD(p, n); p+=2;
*p++ = atoi(argv[8]);
n = atoi(argv[9]); PLONG(p, n); p += 4;
n = atoi(argv[10]); PWORD(p, n); p += 2;
if(p != vbe.buf+19){
fprint(2, "prog error\n");
return;
}
*
*/
return vbecall(vbe, &u);
}
void
vesatextmode(void)
{
if(vbe == nil){
vbe = mkvbe();
if(!vbe)
error("mkvbe: %r\n");
}
if(vbecheck(vbe) < 0)
error("vbecheck: %r\n");
if(vbesetmode(vbe, 3) < 0)
error("vbesetmode: %r\n");
}
static Flag edidflags[] = {
Fdigital, "digital",
Fdpmsstandby, "standby",
Fdpmssuspend, "suspend",
Fdpmsactiveoff, "activeoff",
Fmonochrome, "monochrome",
Fgtf, "gtf",
0
};
int parseedid128(Edid *e, void *v);
int
vbeddcedid(Vbe *vbe, Edid *e)
{
uchar *p;
Ureg u;
p = vbesetup(vbe, &u, 0x4F15);
u.bx = 0x0001;
if(vbecall(vbe, &u) < 0)
return -1;
if(parseedid128(e, p) < 0){
werrstr("parseedid128: %r");
return -1;
}
return 0;
}
void
printedid(Edid *e)
{
Modelist *l;
printitem("edid", "mfr");
Bprint(&stdout, "%s\n", e->mfr);
printitem("edid", "serialstr");
Bprint(&stdout, "%s\n", e->serialstr);
printitem("edid", "name");
Bprint(&stdout, "%s\n", e->name);
printitem("edid", "product");
Bprint(&stdout, "%d\n", e->product);
printitem("edid", "serial");
Bprint(&stdout, "%lud\n", e->serial);
printitem("edid", "version");
Bprint(&stdout, "%d.%d\n", e->version, e->revision);
printitem("edid", "mfrdate");
Bprint(&stdout, "%d.%d\n", e->mfryear, e->mfrweek);
printitem("edid", "size (cm)");
Bprint(&stdout, "%dx%d\n", e->dxcm, e->dycm);
printitem("edid", "gamma");
Bprint(&stdout, "%.2f\n", e->gamma/100.);
printitem("edid", "vert (Hz)");
Bprint(&stdout, "%d-%d\n", e->rrmin, e->rrmax);
printitem("edid", "horz (Hz)");
Bprint(&stdout, "%d-%d\n", e->hrmin, e->hrmax);
printitem("edid", "pclkmax");
Bprint(&stdout, "%lud\n", e->pclkmax);
printitem("edid", "flags");
printflags(edidflags, e->flags);
for(l=e->modelist; l; l=l->next){
printitem("edid", l->name);
Bprint(&stdout, "\n\t\tclock=%g\n\t\tshb=%d ehb=%d ht=%d\n\t\tvrs=%d vre=%d vt=%d\n\t\thsync=%c vsync=%c %s\n",
l->frequency/1.e6, l->shb, l->ehb, l->ht, l->vrs, l->vre, l->vt, l->hsync?l->hsync:'?', l->vsync?l->vsync:'?', l->interlace?"interlace=v" : "");
}
}
Modelist*
addmode(Modelist *l, Mode m)
{
int rr;
Modelist **lp;
//m.z = 8; // BUG
rr = (m.frequency+m.ht*m.vt/2)/(m.ht*m.vt);
snprint(m.name, sizeof m.name, "%dx%dx%d@%dHz", m.x, m.y, m.z, rr);
if(m.shs == 0)
m.shs = m.shb;
if(m.ehs == 0)
m.ehs = m.ehb;
if(m.vbs == 0)
m.vbs = m.vrs;
if(m.vbe == 0)
m.vbe = m.vbs+1;
for(lp=&l; *lp; lp=&(*lp)->next){
if(strcmp((*lp)->name, m.name) == 0){
(*lp)->Mode = m;
return l;
}
}
*lp = alloc(sizeof(**lp));
(*lp)->Mode = m;
return l;
}
/*
* Parse VESA EDID information. Based on the VESA
* Extended Display Identification Data standard, Version 3,
* November 13, 1997. See /public/doc/vesa/edidv3.pdf.
*
* This only handles 128-byte EDID blocks. Until I find
* a monitor that produces 256-byte blocks, I'm not going
* to try to decode them.
*/
/*
* Established timings block. There is a bitmap
* that says whether each mode is supported. Most
* of these have VESA definitions. Those that don't are marked
* as such, and we ignore them (the lookup fails).
*/
static char *estabtime[] = {
"720x400@70Hz", /* non-VESA: IBM, VGA */
"720x400@88Hz", /* non-VESA: IBM, XGA2 */
"640x480@60Hz",
"640x480@67Hz", /* non-VESA: Apple, Mac II */
"640x480@72Hz",
"640x480@75Hz",
"800x600@56Hz",
"800x600@60Hz",
"800x600@72Hz",
"800x600@75Hz",
"832x624@75Hz", /* non-VESA: Apple, Mac II */
"1024x768i@87Hz", /* non-VESA: IBM */
"1024x768@60Hz",
"1024x768@70Hz",
"1024x768@75Hz",
"1280x1024@75Hz",
"1152x870@75Hz", /* non-VESA: Apple, Mac II */
};
/*
* Decode the EDID detailed timing block. See pp. 20-21 of the standard.
*/
static int
decodedtb(Mode *m, uchar *p)
{
int ha, hb, hso, hspw, rr, va, vb, vso, vspw;
/* int dxmm, dymm, hbord, vbord; */
memset(m, 0, sizeof *m);
m->frequency = ((p[1]<<8) | p[0]) * 10000;
ha = ((p[4] & 0xF0)<<4) | p[2]; /* horizontal active */
hb = ((p[4] & 0x0F)<<8) | p[3]; /* horizontal blanking */
va = ((p[7] & 0xF0)<<4) | p[5]; /* vertical active */
vb = ((p[7] & 0x0F)<<8) | p[6]; /* vertical blanking */
hso = ((p[11] & 0xC0)<<2) | p[8]; /* horizontal sync offset */
hspw = ((p[11] & 0x30)<<4) | p[9]; /* horizontal sync pulse width */
vso = ((p[11] & 0x0C)<<2) | ((p[10] & 0xF0)>>4); /* vertical sync offset */
vspw = ((p[11] & 0x03)<<4) | (p[10] & 0x0F); /* vertical sync pulse width */
/* dxmm = (p[14] & 0xF0)<<4) | p[12]; /* horizontal image size (mm) */
/* dymm = (p[14] & 0x0F)<<8) | p[13]; /* vertical image size (mm) */
/* hbord = p[15]; /* horizontal border (pixels) */
/* vbord = p[16]; /* vertical border (pixels) */
m->x = ha;
m->y = va;
m->ht = ha+hb;
m->shs = ha;
m->shb = ha+hso;
m->ehb = ha+hso+hspw;
m->ehs = ha+hb;
m->vt = va+vb;
m->vbs = va;
m->vrs = va+vso;
m->vre = va+vso+vspw;
m->vbe = va+vb;
if(p[17] & 0x80) /* interlaced */
m->interlace = 'v';
if(p[17] & 0x60) /* some form of stereo monitor mode; no support */
return -1;
/*
* Sync signal description. I have no idea how to properly handle the
* first three cases, which I think are aimed at things other than
* canonical SVGA monitors.
*/
switch((p[17] & 0x18)>>3) {
case 0: /* analog composite sync signal*/
case 1: /* bipolar analog composite sync signal */
/* p[17] & 0x04 means serration: hsync during vsync */
/* p[17] & 0x02 means sync pulse appears on RGB not just G */
break;
case 2: /* digital composite sync signal */
/* p[17] & 0x04 means serration: hsync during vsync */
/* p[17] & 0x02 means hsync positive outside vsync */
break;
case 3: /* digital separate sync signal; the norm */
m->vsync = (p[17] & 0x04) ? '+' : '-';
m->hsync = (p[17] & 0x02) ? '+' : '-';
break;
}
/* p[17] & 0x01 is another stereo bit, only referenced if p[17] & 0x60 != 0 */
rr = (m->frequency+m->ht*m->vt/2) / (m->ht*m->vt);
snprint(m->name, sizeof m->name, "%dx%d@%dHz", m->x, m->y, rr);
return 0;
}
extern Mode *vesamodes[];
int
vesalookup(Mode *m, char *name)
{
Mode **p;
for(p=vesamodes; *p; p++)
if(strcmp((*p)->name, name) == 0) {
*m = **p;
return 0;
}
return -1;
}
static int
decodesti(Mode *m, uchar *p)
{
int x, y, rr;
char str[20];
x = (p[0]+31)*8;
switch((p[1]>>6) & 3){
default:
case 0:
y = x;
break;
case 1:
y = (x*4)/3;
break;
case 2:
y = (x*5)/4;
break;
case 3:
y = (x*16)/9;
break;
}
rr = (p[1] & 0x1F) + 60;
sprint(str, "%dx%d@%dHz", x, y, rr);
return vesalookup(m, str);
}
int
parseedid128(Edid *e, void *v)
{
static uchar magic[8] = { 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00 };
uchar *p, *q, sum;
int dpms, estab, i, m, vid;
Mode mode;
memset(e, 0, sizeof *e);
p = (uchar*)v;
if(memcmp(p, magic, 8) != 0) {
werrstr("bad edid header");
return -1;
}
sum = 0;
for(i=0; i<128; i++)
sum += p[i];
if(sum != 0) {
werrstr("bad edid checksum");
return -1;
}
p += 8;
assert(p == (uchar*)v+8); /* assertion offsets from pp. 12-13 of the standard */
/*
* Manufacturer name is three 5-bit ascii letters, packed
* into a big endian [sic] short in big endian order. The high bit is unused.
*/
i = (p[0]<<8) | p[1];
p += 2;
e->mfr[0] = 'A'-1 + ((i>>10) & 0x1F);
e->mfr[1] = 'A'-1 + ((i>>5) & 0x1F);
e->mfr[2] = 'A'-1 + (i & 0x1F);
e->mfr[3] = '\0';
/*
* Product code is a little endian short.
*/
e->product = (p[1]<<8) | p[0];
p += 2;
/*
* Serial number is a little endian long, 0x01010101 = unused.
*/
e->serial = (p[3]<<24) | (p[2]<<16) | (p[1]<<8) | p[0];
p += 4;
if(e->serial == 0x01010101)
e->serial = 0;
e->mfrweek = *p++;
e->mfryear = 1990 + *p++;
assert(p == (uchar*)v+8+10);
/*
* Structure version is next two bytes: major.minor.
*/
e->version = *p++;
e->revision = *p++;
assert(p == (uchar*)v+8+10+2);
/*
* Basic display parameters / features.
*/
/*
* Video input definition byte: 0x80 tells whether it is
* an analog or digital screen; we ignore the other bits.
* See p. 15 of the standard.
*/
vid = *p++;
if(vid & 0x80)
e->flags |= Fdigital;
e->dxcm = *p++;
e->dycm = *p++;
e->gamma = 100 + *p++;
dpms = *p++;
if(dpms & 0x80)
e->flags |= Fdpmsstandby;
if(dpms & 0x40)
e->flags |= Fdpmssuspend;
if(dpms & 0x20)
e->flags |= Fdpmsactiveoff;
if((dpms & 0x18) == 0x00)
e->flags |= Fmonochrome;
if(dpms & 0x01)
e->flags |= Fgtf;
assert(p == (uchar*)v+8+10+2+5);
/*
* Color characteristics currently ignored.
*/
p += 10;
assert(p == (uchar*)v+8+10+2+5+10);
/*
* Established timings: a bitmask of 19 preset timings.
*/
estab = (p[0]<<16) | (p[1]<<8) | p[2];
p += 3;
for(i=0, m=1<<23; i<nelem(estabtime); i++, m>>=1)
if(estab & m)
if(vesalookup(&mode, estabtime[i]) == 0)
e->modelist = addmode(e->modelist, mode);
assert(p == (uchar*)v+8+10+2+5+10+3);
/*
* Standard Timing Identifications: eight 2-byte selectors
* of more standard timings.
*/
for(i=0; i<8; i++, p+=2)
if(decodesti(&mode, p+2*i) == 0)
e->modelist = addmode(e->modelist, mode);
assert(p == (uchar*)v+8+10+2+5+10+3+16);
/*
* Detailed Timings
*/
fprint(2, "dt\n");
for(i=0; i<4; i++, p+=18) {
fprint(2, "%.8H\n", p);
if(p[0] || p[1]) { /* detailed timing block: p[0] or p[1] != 0 */
if(decodedtb(&mode, p) == 0)
e->modelist = addmode(e->modelist, mode);
} else if(p[2]==0) { /* monitor descriptor block */
switch(p[3]) {
case 0xFF: /* monitor serial number (13-byte ascii, 0A terminated) */
if(q = memchr(p+5, 0x0A, 13))
*q = '\0';
memset(e->serialstr, 0, sizeof(e->serialstr));
strncpy(e->serialstr, (char*)p+5, 13);
break;
case 0xFE: /* ascii string (13-byte ascii, 0A terminated) */
break;
case 0xFD: /* monitor range limits */
print("fd %.18H\n", p);
e->rrmin = p[5];
e->rrmax = p[6];
e->hrmin = p[7]*1000;
e->hrmax = p[8]*1000;
if(p[9] != 0xFF)
e->pclkmax = p[9]*10*1000000;
break;
case 0xFC: /* monitor name (13-byte ascii, 0A terminated) */
if(q = memchr(p+5, 0x0A, 13))
*q = '\0';
memset(e->name, 0, sizeof(e->name));
strncpy(e->name, (char*)p+5, 13);
break;
case 0xFB: /* extra color point data */
break;
case 0xFA: /* extra standard timing identifications */
for(i=0; i<6; i++)
if(decodesti(&mode, p+5+2*i) == 0)
e->modelist = addmode(e->modelist, mode);
break;
}
}
}
assert(p == (uchar*)v+8+10+2+5+10+3+16+72);
return 0;
}
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