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- #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");
- 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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