10 #define farptr_to_linear(rmaddr) \
11 ((((intptr_t)(rmaddr) >> 12) & 0xffff0) + ((intptr_t)(rmaddr) & 0xffff))
13 static int init(void);
14 static void cleanup(void);
15 static struct vid_modeinfo *find_mode(int mode);
16 static int setmode(int mode);
17 static int getmode(void);
18 static const char *memsize_str(long sz);
19 static int get_mode_info(int mode, struct vbe_mode_info *mi);
20 static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi);
21 static unsigned int calc_mask(int nbits, int pos);
23 static void pack(uint32_t *pix, int r, int g, int b);
24 static void unpack(uint32_t pix, int *r, int *g, int *b);
25 static void clear(uint32_t color);
26 static void blitfb_lfb(void *fb, int pitch);
27 static void blitfb_banked(void *fb, int pitch);
28 static void flip(int vsync);
30 static struct vid_driver drv;
31 static struct vid_drvops drvops = {init, cleanup, setmode, getmode};
32 static unsigned int vbe_ver;
35 static struct vid_modeinfo *cur_mi;
36 static int cur_pgsize;
39 void vid_register_vbe(void)
45 vid_drvlist[vid_numdrv++] = &drv;
51 struct dpmi_regs regs = {0};
53 struct vbe_mode_info vbemi;
54 unsigned short bufseg;
55 uint16_t *vbe_modelist, *modelist;
57 struct vid_modeinfo modeinf;
63 bufseg = (intptr_t)vbe >> 4;
65 /* call VBE function 00 (get controller information) */
66 memcpy(vbe->sig, "VBE2", 4); /* denote we want VBE 2.0 info */
69 dpmi_rmint(0x10, ®s);
70 if((regs.eax & 0xffff) != 0x4f || memcmp(vbe->sig, "VESA", 4) != 0) {
71 fprintf(stderr, "failed to get VBE controller information\n");
77 printf("Found VBE %d.%d\n", VBE_VER_MAJOR(vbe_ver), VBE_VER_MINOR(vbe_ver));
78 printf("OEM: %s\n", (char*)farptr_to_linear(vbe->oem_name));
79 if(vbe_ver >= 0x0200) {
80 printf("%s - %s (%s)\n", (char*)farptr_to_linear(vbe->vendor),
81 (char*)farptr_to_linear(vbe->product),
82 (char*)farptr_to_linear(vbe->revstr));
84 printf("Video RAM: %s\n", memsize_str((long)vbe->vmem_blk * 65536));
86 vbe_modelist = (uint16_t*)farptr_to_linear(vbe->modelist_addr);
88 for(i=0; i<1024; i++) {
89 if(vbe_modelist[i] == 0xffff) break;
93 if(!(modelist = malloc(count * sizeof *modelist))) {
94 fprintf(stderr, "failed to allocate mode list\n");
97 for(i=0; i<count; i++) {
98 modelist[i] = vbe_modelist[i];
101 if(!(drv.modes = malloc(count * sizeof *drv.modes))) {
102 fprintf(stderr, "failed to allocate mode list\n");
108 for(i=0; i<count; i++) {
109 if(get_mode_info(modelist[i], &vbemi) == -1) {
112 if(conv_vbeinfo(modelist[i], drv.modes + drv.num_modes, &vbemi) == -1) {
122 static void cleanup(void)
129 static struct vid_modeinfo *find_mode(int mode)
132 for(i=0; i<drv.num_modes; i++) {
133 if(drv.modes[i].modeno == mode) {
134 return drv.modes + i;
140 static int setmode(int mode)
142 struct vid_modeinfo *minf;
143 struct dpmi_regs regs = {0};
145 if((minf = find_mode(mode)) && minf->lfb) {
146 mode |= VBE_MODE_LFB;
152 dpmi_rmint(0x10, ®s);
154 if((regs.eax & 0xffff) != 0x4f) {
155 if(mode & VBE_MODE_LFB) {
156 mode &= ~VBE_MODE_LFB;
163 if(!(cur_mi = minf)) return 0;
165 cur_pgsize = minf->height * minf->pitch;
167 if(mode & VBE_MODE_LFB) {
168 minf->ops.blitfb = blitfb_lfb;
170 minf->ops.blitfb = blitfb_banked;
175 static int getmode(void)
180 static const char *memsize_str(long sz)
182 static const char *suffix[] = {"bytes", "kb", "mb", "gb", 0};
186 while(sz > 1024 && suffix[cnt + 1]) {
191 sprintf(buf, "%ld %s", sz, suffix[cnt]);
195 static int get_mode_info(int mode, struct vbe_mode_info *mi)
197 struct dpmi_regs regs = {0};
198 struct vbe_mode_info *miptr;
201 miptr = dpmi_lowbuf();
202 bufseg = (intptr_t)miptr >> 4;
207 dpmi_rmint(0x10, ®s);
208 if((regs.eax & 0xffff) != 0x4f) {
216 int vid_setwin(int wid, int pos)
218 struct dpmi_regs regs = {0};
223 dpmi_rmint(0x10, ®s);
224 if((regs.eax & 0xffff) != 0x4f) {
230 static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi)
232 static int gran_shift;
233 static const struct { int width, height, bpp; } stdmode[] = {
234 {640, 400, 8}, /* 100h */
235 {640, 480, 8}, /* 101h */
236 {800, 600, 4}, {800, 600, 8}, /* 102h - 103h */
237 {1024, 768, 4}, {1024, 768, 8}, /* 104h - 105h */
238 {1280, 1024, 4}, {1280, 1024, 8}, /* 106h - 107h */
239 {80, 60, 4}, {132, 25, 4}, {132, 43, 4}, {132, 50, 4}, {132, 60, 4},
240 {320, 200, 15}, {320, 200, 16}, {320, 200, 24}, /* 10dh - 10fh */
241 {640, 480, 15}, {640, 480, 16}, {640, 480, 24}, /* 110h - 112h */
242 {800, 600, 15}, {800, 600, 16}, {800, 600, 24}, /* 113h - 115h */
243 {1024, 768, 15}, {1024, 768, 16}, {1024, 768, 24}, /* 116h - 118h */
244 {1280, 1024, 15}, {1280, 1024, 16}, {1280, 1024, 24} /* 119h - 11bh */
247 if(!(vbemi->attr & VBE_ATTR_AVAIL)) {
248 return -1; /* ignore unsupported modes */
250 if(!(vbemi->attr & VBE_ATTR_GFX)) {
251 return -1; /* ignore text modes */
253 if(vbemi->attr & VBE_ATTR_LFB) {
259 mi->vmem_addr = 0xa0000;
261 if(vbe_ver >= 0x0102) {
262 mi->width = vbemi->xres;
263 mi->height = vbemi->yres;
264 mi->bpp = vbemi->bpp;
265 mi->rshift = vbemi->rpos;
266 mi->gshift = vbemi->gpos;
267 mi->bshift = vbemi->bpos;
268 mi->rmask = calc_mask(vbemi->rsize, vbemi->rpos);
269 mi->gmask = calc_mask(vbemi->gsize, vbemi->gpos);
270 mi->bmask = calc_mask(vbemi->bsize, vbemi->bpos);
271 mi->pages = vbemi->num_img_pages + 1;
273 if(vbe_ver >= 0x0200) {
274 mi->vmem_addr = vbemi->fb_addr;
275 mi->vmem_size = vbemi->scanline_bytes * mi->height * mi->pages;
278 if((mode & 0xff) > 7) {
281 mi->width = stdmode[mode & 0xff].width;
282 mi->height = stdmode[mode & 0xff].height;
283 mi->bpp = stdmode[mode & 0xff].bpp;
285 mi->ncolors = 1 << mi->bpp;
286 mi->pitch = vbemi->scanline_bytes;
287 mi->win_size = vbemi->win_size;
288 mi->win_gran = vbemi->win_gran;
292 if(mi->win_gran > 0 && mi->win_gran < 64) {
293 int gran = mi->win_gran;
298 mi->win_step = 1 << gran_shift;
302 mi->ops.unpack = unpack;
303 mi->ops.setpal = vga_setpal;
304 mi->ops.getpal = vga_getpal;
305 mi->ops.vsync = vid_vsync;
306 mi->ops.clear = clear;
312 static unsigned int calc_mask(int nbits, int pos)
315 unsigned int mask = 0;
317 for(i=0; i<nbits; i++) {
318 mask = (mask << 1) | 1;
324 static void pack(uint32_t *pix, int r, int g, int b)
326 *pix = (((uint32_t)r << cur_mi->rshift) & cur_mi->rmask) |
327 (((uint32_t)g << cur_mi->gshift) & cur_mi->gmask) |
328 (((uint32_t)b << cur_mi->bshift) & cur_mi->bmask);
331 static void unpack(uint32_t pix, int *r, int *g, int *b)
333 *r = (pix & cur_mi->rmask) >> cur_mi->rshift;
334 *g = (pix & cur_mi->gmask) >> cur_mi->gshift;
335 *b = (pix & cur_mi->bmask) >> cur_mi->bshift;
338 static void clear(uint32_t color)
342 static void blitfb_lfb(void *fb, int pitch)
345 unsigned char *dest, *src;
350 for(i=0; i<cur_mi->height; i++) {
351 memcpy(dest, src, cur_mi->pitch);
352 dest += cur_mi->pitch;
357 static void blitfb_banked(void *fb, int pitch)
359 int sz, offs, pending;
360 unsigned char *pptr = fb;
362 /* assume initial window offset at 0 */
364 pending = cur_pgsize;
366 sz = pending > 65536 ? 65536 : pending;
367 memcpy((void*)0xa0000, pptr, sz);
370 offs += cur_mi->win_step;
376 static void flip(int vsync)