11 #define SAME_BPP(a, b) \
12 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
13 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
15 void (*blit_frame)(void*, int);
17 int resizefb(int x, int y, int bpp, int pitch);
19 static void blit_frame_lfb(void *pixels, int vsync);
20 static void blit_frame_banked(void *pixels, int vsync);
21 static uint32_t calc_mask(int sz, int pos);
23 static void enable_wrcomb(uint32_t addr, int len);
24 static void print_mtrr(void);
26 static struct video_mode *vmodes;
27 static int num_vmodes;
29 static int vbe_init_ver;
30 static struct vbe_info vbe;
33 static struct video_mode *curmode;
34 static void *vpgaddr[2];
35 static int frontidx, backidx;
36 static int pgcount, pgsize, fbsize;
41 int i, num, max_modes;
42 struct video_mode *vmptr;
44 if(vbe_info(&vbe) == -1) {
45 fprintf(stderr, "failed to retrieve VBE information\n");
48 vbe_print_info(stdout, &vbe);
52 if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
53 fprintf(stderr, "failed to allocate video modes list\n");
57 num = vbe_num_modes(&vbe);
58 for(i=0; i<num; i++) {
59 struct vbe_mode_info minf;
61 if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
65 if(num_vmodes >= max_modes) {
66 int newmax = max_modes ? (max_modes << 1) : 16;
67 if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
68 fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
76 vmptr = vmodes + num_vmodes++;
77 memset(vmptr, 0, sizeof *vmptr);
78 vmptr->mode = vbe.modes[i];
79 vmptr->xsz = minf.xres;
80 vmptr->ysz = minf.yres;
81 vmptr->bpp = minf.bpp;
82 vmptr->pitch = minf.scanline_bytes;
83 if(minf.mem_model == VBE_TYPE_DIRECT) {
84 vmptr->rbits = minf.rsize;
85 vmptr->gbits = minf.gsize;
86 vmptr->bbits = minf.bsize;
87 vmptr->rshift = minf.rpos;
88 vmptr->gshift = minf.gpos;
89 vmptr->bshift = minf.bpos;
90 vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
91 vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
92 vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
93 /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
95 if(minf.attr & VBE_ATTR_LFB) {
96 vmptr->fb_addr = minf.fb_addr;
98 vmptr->bank_size = (uint32_t)minf.bank_size * 1024;
99 if(!vmptr->bank_size) {
100 vmptr->bank_size = 65536;
103 vmptr->max_pages = minf.num_img_pages;
105 printf("%04x: ", vbe.modes[i]);
106 vbe_print_mode_info(stdout, &minf);
110 vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
114 void cleanup_video(void)
119 struct video_mode *video_modes(void)
124 int num_video_modes(void)
129 struct video_mode *get_video_mode(int idx)
131 if(idx == VMODE_CURRENT) {
137 int match_video_mode(int xsz, int ysz, int bpp)
140 struct video_mode *vm;
142 for(i=0; i<num_vmodes; i++) {
144 if(vm->xsz != xsz || vm->ysz != ysz) continue;
145 if(SAME_BPP(vm->bpp, bpp)) {
148 if(vm->bpp == bpp) break;
152 fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
158 int find_video_mode(int mode)
161 struct video_mode *vm;
164 for(i=0; i<num_vmodes; i++) {
165 if(vm->mode == mode) return i;
170 void *set_video_mode(int idx, int nbuf)
173 struct video_mode *vm = vmodes + idx;
175 if(curmode == vm) return vpgaddr[0];
177 printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
178 vm->xsz, vm->ysz, vm->bpp);
181 mode = vm->mode | VBE_MODE_LFB;
182 if(vbe_setmode(mode) == -1) {
184 if(vbe_setmode(mode) == -1) {
185 fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
188 printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
191 /* unmap previous video memory mapping, if there was one (switching modes) */
192 if(vpgaddr[0] && vpgaddr[0] != (void*)0xa0000) {
193 dpmi_munmap(vpgaddr[0]);
194 vpgaddr[0] = vpgaddr[1] = 0;
198 if(nbuf < 1) nbuf = 1;
199 if(nbuf > 2) nbuf = 2;
200 pgcount = nbuf > vm->max_pages ? vm->max_pages : nbuf;
201 pgsize = vm->ysz * vm->pitch;
202 fbsize = pgcount * pgsize;
204 printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
205 printf("phys addr: %p\n", (void*)vm->fb_addr);
209 vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
211 fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
212 (unsigned long)vm->fb_addr, fbsize);
216 memset(vpgaddr[0], 0xaa, pgsize);
219 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
221 page_flip(FLIP_NOW); /* start with the second page visible */
223 frontidx = backidx = 0;
227 blit_frame = blit_frame_lfb;
230 enable_wrcomb(vm->fb_addr, fbsize);
233 vpgaddr[0] = (void*)0xa0000;
236 blit_frame = blit_frame_banked;
239 /* allocate main memory framebuffer */
240 if(resizefb(vm->xsz, vm->ysz, vm->bpp, vm->pitch) == -1) {
241 fprintf(stderr, "failed to allocate %dx%d (%d bpp) framebuffer\n", vm->xsz,
251 int set_text_mode(void)
253 /* unmap previous video memory mapping, if there was one (switching modes) */
254 if(vpgaddr[0] && vpgaddr[0] != (void*)0xa0000) {
255 dpmi_munmap(vpgaddr[0]);
256 vpgaddr[0] = vpgaddr[1] = 0;
264 void *page_flip(int vsync)
267 /* page flipping not supported */
271 vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
273 backidx = (backidx + 1) & 1;
275 return vpgaddr[backidx];
279 static void blit_frame_lfb(void *pixels, int vsync)
281 if(vsync) wait_vsync();
282 memcpy64(vpgaddr[frontidx], pixels, pgsize >> 3);
285 static void blit_frame_banked(void *pixels, int vsync)
288 unsigned int pending;
289 unsigned char *pptr = pixels;
291 if(vsync) wait_vsync();
293 /* assume initial window offset at 0 */
297 sz = pending > curmode->bank_size ? curmode->bank_size : pending;
298 //memcpy64((void*)0xa0000, pptr, sz >> 3);
299 memcpy((void*)0xa0000, pptr, sz);
302 vbe_setwin(0, ++offs);
308 static uint32_t calc_mask(int sz, int pos)
312 mask = (mask << 1) | 1;
317 #define get_msr(msr, low, high) \
320 : "=a"(low), "=d"(high) \
323 #define set_msr(msr, low, high) \
326 :: "c"(msr), "a"(low), "d"(high))
328 #define MSR_MTRRCAP 0xfe
329 #define MSR_MTRRDEFTYPE 0x2ff
330 #define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
331 #define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
332 #define MTRRDEF_EN 0x800
333 #define MTRRCAP_HAVE_WC 0x400
334 #define MTRRMASK_VALID 0x800
338 static int get_page_memtype(uint32_t addr, int num_ranges)
341 uint32_t rlow, rhigh;
344 for(i=0; i<num_ranges; i++) {
345 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
346 if(!(rlow & MTRRMASK_VALID)) {
350 get_msr(MSR_MTRRBASE(i), rlow, rhigh);
351 base = rlow & 0xfffff000;
352 mask = rlow & 0xfffff000;
354 if((addr & mask) == (base & mask)) {
359 get_msr(MSR_MTRRDEFTYPE, rlow, rhigh);
363 static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
366 if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
375 static int alloc_mtrr(int num_ranges)
378 uint32_t rlow, rhigh;
380 for(i=0; i<num_ranges; i++) {
381 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
382 if(!(rlow & MTRRMASK_VALID)) {
389 static void enable_wrcomb(uint32_t addr, int len)
391 int num_ranges, mtrr;
392 uint32_t rlow, rhigh;
395 if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
396 fprintf(stderr, "failed to enable write combining, unaligned range: %p/%x\n",
397 (void*)addr, (unsigned int)len);
401 get_msr(MSR_MTRRCAP, rlow, rhigh);
402 num_ranges = rlow & 0xff;
404 printf("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
406 if(!(rlow & MTRRCAP_HAVE_WC)) {
407 fprintf(stderr, "failed to enable write combining, processor doesn't support it\n");
411 if(check_wrcomb_enabled(addr, len, num_ranges)) {
415 if((mtrr = alloc_mtrr(num_ranges)) == -1) {
416 fprintf(stderr, "failed to enable write combining, no free MTRRs\n");
426 mask = ~mask & 0xfffff000;
428 printf(" ... mask: %08x\n", (unsigned int)mask);
431 get_msr(MSR_MTRRDEFTYPE, def, rhigh);
432 set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
434 set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
435 set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
437 set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
441 static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
443 static const char *mtrr_type_name(int type)
445 if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
446 return mtrr_names[0];
448 return mtrr_names[type];
451 static void print_mtrr(void)
454 uint32_t rlow, rhigh, base, mask;
456 get_msr(MSR_MTRRCAP, rlow, rhigh);
457 num_ranges = rlow & 0xff;
459 for(i=0; i<num_ranges; i++) {
460 get_msr(MSR_MTRRBASE(i), base, rhigh);
461 get_msr(MSR_MTRRMASK(i), mask, rhigh);
463 if(mask & MTRRMASK_VALID) {
464 printf("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
465 (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
467 printf("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,