11 #define farptr_to_linear(rmaddr) \
12 ((((intptr_t)(rmaddr) >> 12) & 0xffff0) + ((intptr_t)(rmaddr) & 0xffff))
14 static int init(void);
15 static void cleanup(void);
16 static struct vid_modeinfo *find_mode(int mode);
17 static int setmode(int mode);
18 static int getmode(void);
19 static const char *memsize_str(long sz);
20 static int get_mode_info(int mode, struct vbe_mode_info *mi);
21 static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi);
22 static unsigned int calc_mask(int nbits, int pos);
24 static void pack(uint32_t *pix, int r, int g, int b);
25 static void unpack(uint32_t pix, int *r, int *g, int *b);
26 static void clear(uint32_t color);
27 static void blitfb_lfb(void *fb, int pitch);
28 static void blitfb_banked(void *fb, int pitch);
29 static void flip(int vsync);
31 static struct vid_driver drv;
32 static struct vid_drvops drvops = {init, cleanup, setmode, getmode};
33 static unsigned int vbe_ver;
36 static struct vid_modeinfo *cur_mi;
37 static int cur_pgsize;
40 void vid_register_vbe(void)
46 vid_drvlist[vid_numdrv++] = &drv;
52 struct dpmi_regs regs = {0};
54 struct vbe_mode_info vbemi;
55 unsigned short bufseg;
56 uint16_t *vbe_modelist, *modelist;
58 struct vid_modeinfo modeinf;
64 bufseg = (intptr_t)vbe >> 4;
66 /* call VBE function 00 (get controller information) */
67 memcpy(vbe->sig, "VBE2", 4); /* denote we want VBE 2.0 info */
70 dpmi_rmint(0x10, ®s);
71 if((regs.eax & 0xffff) != 0x4f || memcmp(vbe->sig, "VESA", 4) != 0) {
72 errormsg("failed to get VBE controller information\n");
78 infomsg("Found VBE %d.%d\n", VBE_VER_MAJOR(vbe_ver), VBE_VER_MINOR(vbe_ver));
79 infomsg("OEM: %s\n", (char*)farptr_to_linear(vbe->oem_name));
80 if(vbe_ver >= 0x0200) {
81 infomsg("%s - %s (%s)\n", (char*)farptr_to_linear(vbe->vendor),
82 (char*)farptr_to_linear(vbe->product),
83 (char*)farptr_to_linear(vbe->revstr));
85 infomsg("Video RAM: %s\n", memsize_str((long)vbe->vmem_blk * 65536));
87 vbe_modelist = (uint16_t*)farptr_to_linear(vbe->modelist_addr);
89 for(i=0; i<1024; i++) {
90 if(vbe_modelist[i] == 0xffff) break;
94 if(!(modelist = malloc(count * sizeof *modelist))) {
95 errormsg("failed to allocate mode list\n");
98 for(i=0; i<count; i++) {
99 modelist[i] = vbe_modelist[i];
102 if(!(drv.modes = malloc(count * sizeof *drv.modes))) {
103 errormsg("failed to allocate mode list\n");
109 for(i=0; i<count; i++) {
110 if(get_mode_info(modelist[i], &vbemi) == -1) {
113 if(conv_vbeinfo(modelist[i], drv.modes + drv.num_modes, &vbemi) == -1) {
123 static void cleanup(void)
130 static struct vid_modeinfo *find_mode(int mode)
133 for(i=0; i<drv.num_modes; i++) {
134 if(drv.modes[i].modeno == mode) {
135 return drv.modes + i;
141 static int setmode(int mode)
143 struct vid_modeinfo *minf;
144 struct dpmi_regs regs = {0};
146 if((minf = find_mode(mode)) && minf->lfb) {
147 mode |= VBE_MODE_LFB;
153 dpmi_rmint(0x10, ®s);
155 if((regs.eax & 0xffff) != 0x4f) {
156 if(mode & VBE_MODE_LFB) {
157 mode &= ~VBE_MODE_LFB;
164 if(!(cur_mi = minf)) return 0;
166 cur_pgsize = minf->height * minf->pitch;
168 if(mode & VBE_MODE_LFB) {
169 minf->ops.blitfb = blitfb_lfb;
171 minf->ops.blitfb = blitfb_banked;
176 static int getmode(void)
181 static const char *memsize_str(long sz)
183 static const char *suffix[] = {"bytes", "kb", "mb", "gb", 0};
187 while(sz > 1024 && suffix[cnt + 1]) {
192 sprintf(buf, "%ld %s", sz, suffix[cnt]);
196 static int get_mode_info(int mode, struct vbe_mode_info *mi)
198 struct dpmi_regs regs = {0};
199 struct vbe_mode_info *miptr;
202 miptr = dpmi_lowbuf();
203 bufseg = (intptr_t)miptr >> 4;
208 dpmi_rmint(0x10, ®s);
209 if((regs.eax & 0xffff) != 0x4f) {
217 int vid_setwin(int wid, int pos)
219 struct dpmi_regs regs = {0};
224 dpmi_rmint(0x10, ®s);
225 if((regs.eax & 0xffff) != 0x4f) {
231 static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi)
233 static int gran_shift;
234 static const struct { int width, height, bpp; } stdmode[] = {
235 {640, 400, 8}, /* 100h */
236 {640, 480, 8}, /* 101h */
237 {800, 600, 4}, {800, 600, 8}, /* 102h - 103h */
238 {1024, 768, 4}, {1024, 768, 8}, /* 104h - 105h */
239 {1280, 1024, 4}, {1280, 1024, 8}, /* 106h - 107h */
240 {80, 60, 4}, {132, 25, 4}, {132, 43, 4}, {132, 50, 4}, {132, 60, 4},
241 {320, 200, 15}, {320, 200, 16}, {320, 200, 24}, /* 10dh - 10fh */
242 {640, 480, 15}, {640, 480, 16}, {640, 480, 24}, /* 110h - 112h */
243 {800, 600, 15}, {800, 600, 16}, {800, 600, 24}, /* 113h - 115h */
244 {1024, 768, 15}, {1024, 768, 16}, {1024, 768, 24}, /* 116h - 118h */
245 {1280, 1024, 15}, {1280, 1024, 16}, {1280, 1024, 24} /* 119h - 11bh */
248 if(!(vbemi->attr & VBE_ATTR_AVAIL)) {
249 return -1; /* ignore unsupported modes */
251 if(!(vbemi->attr & VBE_ATTR_GFX)) {
252 return -1; /* ignore text modes */
254 if(vbemi->attr & VBE_ATTR_LFB) {
260 mi->vmem_addr = 0xa0000;
262 if(vbe_ver >= 0x0102) {
263 mi->width = vbemi->xres;
264 mi->height = vbemi->yres;
265 mi->bpp = vbemi->bpp;
266 mi->rshift = vbemi->rpos;
267 mi->gshift = vbemi->gpos;
268 mi->bshift = vbemi->bpos;
269 mi->rmask = calc_mask(vbemi->rsize, vbemi->rpos);
270 mi->gmask = calc_mask(vbemi->gsize, vbemi->gpos);
271 mi->bmask = calc_mask(vbemi->bsize, vbemi->bpos);
272 mi->pages = vbemi->num_img_pages + 1;
274 if(vbe_ver >= 0x0200) {
275 mi->vmem_addr = vbemi->fb_addr;
276 mi->vmem_size = vbemi->scanline_bytes * mi->height * mi->pages;
279 if((mode & 0xff) > 7) {
282 mi->width = stdmode[mode & 0xff].width;
283 mi->height = stdmode[mode & 0xff].height;
284 mi->bpp = stdmode[mode & 0xff].bpp;
286 mi->ncolors = 1 << mi->bpp;
287 mi->pitch = vbemi->scanline_bytes;
288 mi->win_size = vbemi->win_size;
289 mi->win_gran = vbemi->win_gran;
293 if(mi->win_gran > 0 && mi->win_gran < 64) {
294 int gran = mi->win_gran;
299 mi->win_step = 1 << gran_shift;
303 mi->ops.unpack = unpack;
304 mi->ops.setpal = vga_setpal;
305 mi->ops.getpal = vga_getpal;
306 mi->ops.vsync = vid_vsync;
307 mi->ops.clear = clear;
313 static unsigned int calc_mask(int nbits, int pos)
316 unsigned int mask = 0;
318 for(i=0; i<nbits; i++) {
319 mask = (mask << 1) | 1;
325 static void pack(uint32_t *pix, int r, int g, int b)
327 *pix = (((uint32_t)r << cur_mi->rshift) & cur_mi->rmask) |
328 (((uint32_t)g << cur_mi->gshift) & cur_mi->gmask) |
329 (((uint32_t)b << cur_mi->bshift) & cur_mi->bmask);
332 static void unpack(uint32_t pix, int *r, int *g, int *b)
334 *r = (pix & cur_mi->rmask) >> cur_mi->rshift;
335 *g = (pix & cur_mi->gmask) >> cur_mi->gshift;
336 *b = (pix & cur_mi->bmask) >> cur_mi->bshift;
339 static void clear(uint32_t color)
343 static void blitfb_lfb(void *fb, int pitch)
346 unsigned char *dest, *src;
351 for(i=0; i<cur_mi->height; i++) {
352 memcpy(dest, src, cur_mi->pitch);
353 dest += cur_mi->pitch;
358 static void blitfb_banked(void *fb, int pitch)
360 int sz, offs, pending, winsz;
361 unsigned char *pptr = fb;
363 winsz = cur_mi->win_size << 10;
365 /* assume initial window offset at 0 */
367 pending = cur_pgsize;
369 sz = pending > winsz ? winsz : pending;
370 memcpy((void*)0xa0000, pptr, sz);
373 offs += cur_mi->win_step;
379 static void flip(int vsync)