14 #define VMEM_PTR ((void*)(0xa0000 + __djgpp_conventional_base))
16 #define VMEM_PTR ((void*)0xa0000)
19 #define SAME_BPP(a, b) \
20 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
21 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
23 void (*blit_frame)(void*, int);
25 static void blit_frame_lfb(void *pixels, int vsync);
26 static void blit_frame_banked(void *pixels, int vsync);
27 static uint32_t calc_mask(int sz, int pos);
29 static void enable_wrcomb(uint32_t addr, int len);
30 static const char *mtrr_type_name(int type);
31 static void print_mtrr(void);
33 static struct video_mode *vmodes;
34 static int num_vmodes;
36 static int vbe_init_ver;
37 static struct vbe_info vbe;
40 static struct video_mode *curmode;
41 static void *vpgaddr[2];
42 static int frontidx, backidx;
43 static int pgcount, pgsize, fbsize;
48 int i, num, max_modes;
49 struct video_mode *vmptr;
51 if(vbe_info(&vbe) == -1) {
52 fprintf(stderr, "failed to retrieve VBE information\n");
55 vbe_print_info(stdout, &vbe);
59 if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
60 fprintf(stderr, "failed to allocate video modes list\n");
64 num = vbe_num_modes(&vbe);
65 for(i=0; i<num; i++) {
66 struct vbe_mode_info minf;
68 if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
72 if(num_vmodes >= max_modes) {
73 int newmax = max_modes ? (max_modes << 1) : 16;
74 if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
75 fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
83 vmptr = vmodes + num_vmodes++;
84 memset(vmptr, 0, sizeof *vmptr);
85 vmptr->mode = vbe.modes[i];
86 vmptr->xsz = minf.xres;
87 vmptr->ysz = minf.yres;
88 vmptr->bpp = minf.bpp;
89 vmptr->pitch = minf.scanline_bytes;
90 if(minf.mem_model == VBE_TYPE_DIRECT) {
91 vmptr->rbits = minf.rsize;
92 vmptr->gbits = minf.gsize;
93 vmptr->bbits = minf.bsize;
94 vmptr->rshift = minf.rpos;
95 vmptr->gshift = minf.gpos;
96 vmptr->bshift = minf.bpos;
97 vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
98 vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
99 vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
100 /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
102 if(minf.attr & VBE_ATTR_LFB) {
103 vmptr->fb_addr = minf.fb_addr;
105 vmptr->max_pages = minf.num_img_pages;
106 vmptr->win_gran = minf.win_gran;
108 printf("%04x: ", vbe.modes[i]);
109 vbe_print_mode_info(stdout, &minf);
113 vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
117 void cleanup_video(void)
122 struct video_mode *video_modes(void)
127 int num_video_modes(void)
132 struct video_mode *get_video_mode(int idx)
134 if(idx == VMODE_CURRENT) {
140 int match_video_mode(int xsz, int ysz, int bpp)
143 struct video_mode *vm;
145 for(i=0; i<num_vmodes; i++) {
147 if(vm->xsz != xsz || vm->ysz != ysz) continue;
148 if(SAME_BPP(vm->bpp, bpp)) {
151 if(vm->bpp == bpp) break;
155 fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
161 int find_video_mode(int mode)
164 struct video_mode *vm;
167 for(i=0; i<num_vmodes; i++) {
168 if(vm->mode == mode) return i;
173 void *set_video_mode(int idx, int nbuf)
176 struct video_mode *vm = vmodes + idx;
178 if(curmode == vm) return vpgaddr[0];
180 printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
181 vm->xsz, vm->ysz, vm->bpp);
184 mode = vm->mode | VBE_MODE_LFB;
185 if(vbe_setmode(mode) == -1) {
187 if(vbe_setmode(mode) == -1) {
188 fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
191 printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
194 /* unmap previous video memory mapping, if there was one (switching modes) */
195 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
196 dpmi_munmap(vpgaddr[0]);
197 vpgaddr[0] = vpgaddr[1] = 0;
201 if(nbuf < 1) nbuf = 1;
202 if(nbuf > 2) nbuf = 2;
203 pgcount = nbuf > vm->max_pages + 1 ? vm->max_pages + 1 : nbuf;
204 pgsize = vm->ysz * vm->pitch;
205 fbsize = pgcount * pgsize;
208 printf("rgb mask: %x %x %x\n", (unsigned int)vm->rmask,
209 (unsigned int)vm->gmask, (unsigned int)vm->bmask);
210 printf("rgb shift: %d %d %d\n", vm->rshift, vm->gshift, vm->bshift);
212 printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
214 printf("phys addr: %p\n", (void*)vm->fb_addr);
219 vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
221 fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
222 (unsigned long)vm->fb_addr, fbsize);
226 memset(vpgaddr[0], 0xaa, pgsize);
229 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
231 page_flip(FLIP_NOW); /* start with the second page visible */
233 frontidx = backidx = 0;
237 blit_frame = blit_frame_lfb;
239 /* only attempt to set up write combining if the CPU we're running on
240 * supports memory type range registers, and we're running on ring 0
245 fprintf(stderr, "Can't set framebuffer range to write-combining, running in ring %d\n", cpl);
247 uint32_t len = (uint32_t)vbe.vmem_blk << 16;
249 /* if vmem_blk is 0 or if the reported size is absurd (more than
250 * 256mb), just use the framebuffer size for this mode to setup the
253 if(!len || len > 0x10000000) {
254 printf("reported vmem too large or overflowed, using fbsize for wrcomb setup\n");
258 enable_wrcomb(vm->fb_addr, len);
263 vpgaddr[0] = VMEM_PTR;
266 blit_frame = blit_frame_banked;
268 /* calculate window granularity shift */
269 vm->win_gran_shift = 0;
270 vm->win_64k_step = 1;
271 if(vm->win_gran > 0 && vm->win_gran < 64) {
272 int gran = vm->win_gran;
274 vm->win_gran_shift++;
277 vm->win_64k_step = 1 << vm->win_gran_shift;
280 printf("granularity: %dk (step: %d)\n", vm->win_gran, vm->win_64k_step);
283 /* allocate main memory framebuffer */
285 if(demo_resizefb(vm->xsz, vm->ysz, vm->bpp) == -1) {
286 fprintf(stderr, "failed to allocate %dx%d (%d bpp) framebuffer\n", vm->xsz,
297 int set_text_mode(void)
299 /* unmap previous video memory mapping, if there was one (switching modes) */
300 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
301 dpmi_munmap(vpgaddr[0]);
302 vpgaddr[0] = vpgaddr[1] = 0;
310 void *page_flip(int vsync)
313 /* page flipping not supported */
317 vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
319 backidx = (backidx + 1) & 1;
321 return vpgaddr[backidx];
325 static void blit_frame_lfb(void *pixels, int vsync)
327 if(vsync) wait_vsync();
328 memcpy(vpgaddr[frontidx], pixels, pgsize);
331 static void blit_frame_banked(void *pixels, int vsync)
333 int sz, offs, pending;
334 unsigned char *pptr = pixels;
336 if(vsync) wait_vsync();
338 /* assume initial window offset at 0 */
342 sz = pending > 65536 ? 65536 : pending;
343 memcpy(VMEM_PTR, pptr, sz);
346 offs += curmode->win_64k_step;
352 static uint32_t calc_mask(int sz, int pos)
356 mask = (mask << 1) | 1;
361 #define MSR_MTRRCAP 0xfe
362 #define MSR_MTRRDEFTYPE 0x2ff
363 #define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
364 #define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
365 #define MTRRDEF_EN 0x800
366 #define MTRRCAP_HAVE_WC 0x400
367 #define MTRRMASK_VALID 0x800
371 static int get_page_memtype(uint32_t addr, int num_ranges)
374 uint32_t rlow, rhigh;
377 for(i=0; i<num_ranges; i++) {
378 get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
379 if(!(rlow & MTRRMASK_VALID)) {
382 mask = rlow & 0xfffff000;
384 get_msr(MSR_MTRRBASE(i), &rlow, &rhigh);
385 base = rlow & 0xfffff000;
387 if((addr & mask) == (base & mask)) {
392 get_msr(MSR_MTRRDEFTYPE, &rlow, &rhigh);
396 static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
399 if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
408 static int alloc_mtrr(int num_ranges)
411 uint32_t rlow, rhigh;
413 for(i=0; i<num_ranges; i++) {
414 get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
415 if(!(rlow & MTRRMASK_VALID)) {
422 static void enable_wrcomb(uint32_t addr, int len)
424 int num_ranges, mtrr;
425 uint32_t rlow, rhigh;
428 if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
429 fprintf(stderr, "failed to enable write combining, unaligned range: %p/%x\n",
430 (void*)addr, (unsigned int)len);
434 get_msr(MSR_MTRRCAP, &rlow, &rhigh);
435 num_ranges = rlow & 0xff;
437 printf("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
439 if(!(rlow & MTRRCAP_HAVE_WC)) {
440 fprintf(stderr, "failed to enable write combining, processor doesn't support it\n");
444 if(check_wrcomb_enabled(addr, len, num_ranges)) {
448 if((mtrr = alloc_mtrr(num_ranges)) == -1) {
449 fprintf(stderr, "failed to enable write combining, no free MTRRs\n");
459 mask = ~mask & 0xfffff000;
461 printf(" ... mask: %08x\n", (unsigned int)mask);
464 get_msr(MSR_MTRRDEFTYPE, &def, &rhigh);
465 set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
467 set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
468 set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
470 set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
474 static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
476 static const char *mtrr_type_name(int type)
478 if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
479 return mtrr_names[0];
481 return mtrr_names[type];
484 static void print_mtrr(void)
487 uint32_t rlow, rhigh, base, mask;
489 get_msr(MSR_MTRRCAP, &rlow, &rhigh);
490 num_ranges = rlow & 0xff;
492 for(i=0; i<num_ranges; i++) {
493 get_msr(MSR_MTRRBASE(i), &base, &rhigh);
494 get_msr(MSR_MTRRMASK(i), &mask, &rhigh);
496 if(mask & MTRRMASK_VALID) {
497 printf("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
498 (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
500 printf("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,