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1.1 nbrk 1: /* $OpenBSD: vesabios.c,v 1.4 2007/02/18 19:19:02 gwk Exp $ */
2:
3: /*
4: * Copyright (c) 2002, 2004
5: * Matthias Drochner. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions, and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26: * SUCH DAMAGE.
27: */
28:
29: #include <sys/cdefs.h>
30:
31: #include <sys/param.h>
32: #include <sys/systm.h>
33: #include <sys/device.h>
34: #include <sys/malloc.h>
35: #include <machine/frame.h>
36: #include <machine/kvm86.h>
37:
38: #include <dev/vesa/vesabiosvar.h>
39: #include <dev/vesa/vesabiosreg.h>
40: #include <dev/vesa/vbe.h>
41:
42: struct vbeinfoblock
43: {
44: char VbeSignature[4];
45: uint16_t VbeVersion;
46: uint32_t OemStringPtr;
47: uint32_t Capabilities;
48: uint32_t VideoModePtr;
49: uint16_t TotalMemory;
50: uint16_t OemSoftwareRev;
51: uint32_t OemVendorNamePtr, OemProductNamePtr, OemProductRevPtr;
52: /* data area, in total max 512 bytes for VBE 2.0 */
53: } __packed;
54:
55: #define FAR2FLATPTR(p) ((p & 0xffff) + ((p >> 12) & 0xffff0))
56:
57: int vesabios_match(struct device *, void *, void *);
58: void vesabios_attach(struct device *, struct device *, void *);
59: int vesabios_print(void *, const char *);
60:
61: int vbegetinfo(struct vbeinfoblock **);
62: void vbefreeinfo(struct vbeinfoblock *);
63: #ifdef VESABIOSVERBOSE
64: const char *mm2txt(unsigned int);
65: #endif
66:
67: struct vesabios_softc *vesabios_softc;
68:
69: struct cfattach vesabios_ca = {
70: sizeof(struct vesabios_softc), vesabios_match, vesabios_attach
71: };
72:
73: struct cfdriver vesabios_cd = {
74: NULL, "vesabios", DV_DULL
75: };
76:
77: int
78: vesabios_match(struct device *parent, void *match, void *aux)
79: {
80:
81: return (1);
82: }
83:
84: int
85: vbegetinfo(struct vbeinfoblock **vip)
86: {
87: unsigned char *buf;
88: struct trapframe tf;
89: int res, error;
90:
91: if ((buf = kvm86_bios_addpage(KVM86_CALL_TASKVA)) == NULL) {
92: printf("vbegetinfo: kvm86_bios_addpage failed\n");
93: return (ENOMEM);
94: }
95:
96: memcpy(buf, "VBE2", 4);
97:
98: memset(&tf, 0, sizeof(struct trapframe));
99: tf.tf_eax = VBE_FUNC_CTRLINFO;
100: tf.tf_vm86_es = 0;
101: tf.tf_edi = KVM86_CALL_TASKVA;
102:
103: res = kvm86_bioscall(BIOS_VIDEO_INTR, &tf);
104: if (res || VBECALL_SUPPORT(tf.tf_eax) != VBECALL_SUPPORTED) {
105: printf("vbecall: res=%d, ax=%x\n", res, tf.tf_eax);
106: error = ENXIO;
107: goto out;
108: }
109:
110: if (memcmp(((struct vbeinfoblock *)buf)->VbeSignature, "VESA", 4)) {
111: error = EIO;
112: goto out;
113: }
114:
115: if (vip)
116: *vip = (struct vbeinfoblock *)buf;
117: return (0);
118:
119: out:
120: kvm86_bios_delpage(KVM86_CALL_TASKVA, buf);
121: return (error);
122: }
123:
124: void
125: vbefreeinfo(struct vbeinfoblock *vip)
126: {
127:
128: kvm86_bios_delpage(KVM86_CALL_TASKVA, vip);
129: }
130:
131: int
132: vbeprobe(void)
133: {
134: struct vbeinfoblock *vi;
135: int found = 0;
136:
137: if (vbegetinfo(&vi))
138: return (0);
139: if (VBE_CTRLINFO_VERSION(vi->VbeVersion) > 1) {
140: /* VESA bios is at least version 2.0 */
141: found = 1;
142: }
143: vbefreeinfo(vi);
144: return (found);
145: }
146:
147: #ifdef VESABIOSVERBOSE
148: const char *
149: mm2txt(unsigned int mm)
150: {
151: static char buf[30];
152: static const char *names[] = {
153: "Text mode",
154: "CGA graphics",
155: "Hercules graphics",
156: "Planar",
157: "Packed pixel",
158: "Non-chain 4, 256 color",
159: "Direct Color",
160: "YUV"
161: };
162:
163: if (mm < sizeof(names)/sizeof(names[0]))
164: return (names[mm]);
165: snprintf(buf, sizeof(buf), "unknown memory model %d", mm);
166: return (buf);
167: }
168: #endif
169:
170: void
171: vesabios_attach(struct device *parent, struct device *self, void *aux)
172: {
173: struct vesabios_softc *sc = (struct vesabios_softc *)self;
174: struct vbeinfoblock *vi;
175: unsigned char *buf;
176: struct trapframe tf;
177: int res;
178: char name[256];
179: #define MAXMODES 60
180: uint16_t modes[MAXMODES];
181: int rastermodes[MAXMODES];
182: int textmodes[MAXMODES];
183: int nmodes, nrastermodes, ntextmodes, i;
184: uint32_t modeptr;
185: struct modeinfoblock *mi;
186:
187: if (vbegetinfo(&vi)) {
188: printf("\n");
189: panic("vesabios_attach: disappeared");
190: }
191:
192: printf(": version %d.%d",
193: VBE_CTRLINFO_VERSION(vi->VbeVersion),
194: VBE_CTRLINFO_REVISION(vi->VbeVersion));
195:
196:
197: res = kvm86_bios_read(FAR2FLATPTR(vi->OemVendorNamePtr),
198: name, sizeof(name));
199:
200: sc->sc_size = vi->TotalMemory * 65536;
201: if (res > 0) {
202: name[res - 1] = 0;
203: printf(", %s", name);
204: res = kvm86_bios_read(FAR2FLATPTR(vi->OemProductNamePtr),
205: name, sizeof(name));
206: if (res > 0) {
207: name[res - 1] = 0;
208: printf(" %s", name);
209: }
210: }
211: printf("\n");
212:
213: nmodes = 0;
214: modeptr = FAR2FLATPTR(vi->VideoModePtr);
215: while (nmodes < MAXMODES) {
216: res = kvm86_bios_read(modeptr, (char *)&modes[nmodes], 2);
217: if (res != 2 || modes[nmodes] == 0xffff)
218: break;
219: nmodes++;
220: modeptr += 2;
221: }
222:
223: vbefreeinfo(vi);
224: if (nmodes == 0)
225: return;
226:
227: nrastermodes = ntextmodes = 0;
228:
229: buf = kvm86_bios_addpage(KVM86_CALL_TASKVA);
230: if (!buf) {
231: printf("%s: kvm86_bios_addpage failed\n",
232: self->dv_xname);
233: return;
234: }
235: for (i = 0; i < nmodes; i++) {
236:
237: memset(&tf, 0, sizeof(struct trapframe));
238: tf.tf_eax = VBE_FUNC_MODEINFO;
239: tf.tf_ecx = modes[i];
240: tf.tf_vm86_es = 0;
241: tf.tf_edi = KVM86_CALL_TASKVA;
242:
243: res = kvm86_bioscall(BIOS_VIDEO_INTR, &tf);
244: if (res || VBECALL_SUPPORT(tf.tf_eax) != VBECALL_SUPPORTED) {
245: printf("%s: vbecall: res=%d, ax=%x\n",
246: self->dv_xname, res, tf.tf_eax);
247: printf("%s: error getting info for mode %04x\n",
248: self->dv_xname, modes[i]);
249: continue;
250: }
251: mi = (struct modeinfoblock *)buf;
252: #ifdef VESABIOSVERBOSE
253: printf("%s: VESA mode %04x: attributes %04x",
254: self->dv_xname, modes[i], mi->ModeAttributes);
255: #endif
256: if (!(mi->ModeAttributes & 1)) {
257: #ifdef VESABIOSVERBOSE
258: printf("\n");
259: #endif
260: continue;
261: }
262: if (mi->ModeAttributes & 0x10) {
263: /* graphics */
264: #ifdef VESABIOSVERBOSE
265: printf(", %dx%d %dbbp %s\n",
266: mi->XResolution, mi->YResolution,
267: mi->BitsPerPixel, mm2txt(mi->MemoryModel));
268: #endif
269: if (mi->ModeAttributes & 0x80) {
270: /* flat buffer */
271: rastermodes[nrastermodes++] = modes[i];
272: }
273: } else {
274: /* text */
275: #ifdef VESABIOSVERBOSE
276: printf(", text %dx%d\n",
277: mi->XResolution, mi->YResolution);
278: #endif
279: if (!(mi->ModeAttributes & 0x20)) /* VGA compatible */
280: textmodes[ntextmodes++] = modes[i];
281: }
282: }
283: kvm86_bios_delpage(KVM86_CALL_TASKVA, buf);
284: if (nrastermodes > 0) {
285: sc->sc_modes =
286: (uint16_t *)malloc(sizeof(uint16_t)*nrastermodes,
287: M_DEVBUF, M_NOWAIT);
288: if (sc->sc_modes == NULL) {
289: sc->sc_nmodes = 0;
290: return;
291: }
292: sc->sc_nmodes = nrastermodes;
293: for (i = 0; i < nrastermodes; i++)
294: sc->sc_modes[i] = rastermodes[i];
295: }
296: vesabios_softc = sc;
297: }
298:
299: int
300: vesabios_print(aux, pnp)
301: void *aux;
302: const char *pnp;
303: {
304: char *busname = aux;
305:
306: if (pnp)
307: printf("%s at %s", busname, pnp);
308: return (UNCONF);
309: }