12 #define enable _enable
13 #define disable _disable
17 #define VMEM_PTR ((void*)(0xa0000 + __djgpp_conventional_base))
19 #define VMEM_PTR ((void*)0xa0000)
22 #define SAME_BPP(a, b) \
23 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
24 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
26 void (*blit_frame)(void*, int);
28 int resizefb(int x, int y, int bpp, int pitch);
30 static void blit_frame_lfb(void *pixels, int vsync);
31 static void blit_frame_banked(void *pixels, int vsync);
32 static uint32_t calc_mask(int sz, int pos);
34 static void enable_wrcomb(uint32_t addr, int len);
35 static const char *mtrr_type_name(int type);
36 static void print_mtrr(void);
38 static struct video_mode *vmodes;
39 static int num_vmodes;
41 static int vbe_init_ver;
42 static struct vbe_info vbe;
45 static struct video_mode *curmode;
46 static void *vpgaddr[2];
47 static int frontidx, backidx;
48 static int pgcount, pgsize, fbsize;
53 int i, num, max_modes;
54 struct video_mode *vmptr;
56 if(vbe_info(&vbe) == -1) {
57 fprintf(stderr, "failed to retrieve VBE information\n");
60 vbe_print_info(stdout, &vbe);
64 if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
65 fprintf(stderr, "failed to allocate video modes list\n");
69 num = vbe_num_modes(&vbe);
70 for(i=0; i<num; i++) {
71 struct vbe_mode_info minf;
73 if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
77 if(num_vmodes >= max_modes) {
78 int newmax = max_modes ? (max_modes << 1) : 16;
79 if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
80 fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
88 vmptr = vmodes + num_vmodes++;
89 memset(vmptr, 0, sizeof *vmptr);
90 vmptr->mode = vbe.modes[i];
91 vmptr->xsz = minf.xres;
92 vmptr->ysz = minf.yres;
93 vmptr->bpp = minf.bpp;
94 vmptr->pitch = minf.scanline_bytes;
95 if(minf.mem_model == VBE_TYPE_DIRECT) {
96 vmptr->rbits = minf.rsize;
97 vmptr->gbits = minf.gsize;
98 vmptr->bbits = minf.bsize;
99 vmptr->rshift = minf.rpos;
100 vmptr->gshift = minf.gpos;
101 vmptr->bshift = minf.bpos;
102 vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
103 vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
104 vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
105 /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
108 if(minf.attr & VBE_ATTR_LFB) {
109 vmptr->fb_addr = minf.fb_addr;
112 vmptr->max_pages = minf.num_img_pages;
113 vmptr->win_gran = minf.win_gran;
115 printf("%04x: ", vbe.modes[i]);
116 vbe_print_mode_info(stdout, &minf);
120 vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
124 void cleanup_video(void)
129 struct video_mode *video_modes(void)
134 int num_video_modes(void)
139 struct video_mode *get_video_mode(int idx)
141 if(idx == VMODE_CURRENT) {
147 int match_video_mode(int xsz, int ysz, int bpp)
150 struct video_mode *vm;
152 for(i=0; i<num_vmodes; i++) {
154 if(vm->xsz != xsz || vm->ysz != ysz) continue;
155 if(SAME_BPP(vm->bpp, bpp)) {
158 if(vm->bpp == bpp) break;
162 fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
168 int find_video_mode(int mode)
171 struct video_mode *vm;
174 for(i=0; i<num_vmodes; i++) {
175 if(vm->mode == mode) return i;
181 void *set_video_mode(int idx, int nbuf)
184 struct video_mode *vm = vmodes + idx;
185 struct cpuid_info cpu;
187 if(curmode == vm) return vpgaddr[0];
189 printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
190 vm->xsz, vm->ysz, vm->bpp);
194 mode = vm->mode | VBE_MODE_LFB;
195 if(vbe_setmode(mode) == -1) {
198 if(vbe_setmode(mode) == -1) {
199 fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
202 printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
207 /* unmap previous video memory mapping, if there was one (switching modes) */
208 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
209 dpmi_munmap(vpgaddr[0]);
210 vpgaddr[0] = vpgaddr[1] = 0;
214 if(nbuf < 1) nbuf = 1;
215 if(nbuf > 2) nbuf = 2;
216 pgcount = nbuf > vm->max_pages + 1 ? vm->max_pages + 1 : nbuf;
217 pgsize = vm->ysz * vm->pitch;
218 fbsize = pgcount * pgsize;
221 printf("rgb mask: %x %x %x\n", (unsigned int)vm->rmask,
222 (unsigned int)vm->gmask, (unsigned int)vm->bmask);
223 printf("rgb shift: %d %d %d\n", vm->rshift, vm->gshift, vm->bshift);
225 printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
227 printf("phys addr: %p\n", (void*)vm->fb_addr);
232 vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
234 fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
235 (unsigned long)vm->fb_addr, fbsize);
239 memset(vpgaddr[0], 0xaa, pgsize);
242 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
244 page_flip(FLIP_NOW); /* start with the second page visible */
246 frontidx = backidx = 0;
250 blit_frame = blit_frame_lfb;
253 if(read_cpuid(&cpu) != -1 && cpu.feat & CPUID_FEAT_MTRR) {
254 uint32_t len = (uint32_t)vbe.vmem_blk << 16;
256 /* if vmem_blk is 0 or if the reported size is absurd (more than
257 * 256mb), just use the framebuffer size for this mode to setup the
260 if(!len || len > 0x10000000) {
261 printf("reported vmem too large or overflowed, using fbsize for wrcomb setup\n");
265 enable_wrcomb(vm->fb_addr, len);
270 vpgaddr[0] = VMEM_PTR;
272 vpgaddr[1] = VMEM_PTR;
274 page_flip(FLIP_NOW); /* start with the second page visible */
276 frontidx = backidx = 0;
280 blit_frame = blit_frame_banked;
282 /* calculate window granularity shift */
283 vm->win_gran_shift = 0;
284 vm->win_64k_step = 1;
285 if(vm->win_gran > 0 && vm->win_gran < 64) {
286 int gran = vm->win_gran;
288 vm->win_gran_shift++;
291 vm->win_64k_step = 1 << vm->win_gran_shift;
294 printf("granularity: %dk (step: %d)\n", vm->win_gran, vm->win_64k_step);
301 int set_text_mode(void)
303 /* unmap previous video memory mapping, if there was one (switching modes) */
304 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
305 dpmi_munmap(vpgaddr[0]);
306 vpgaddr[0] = vpgaddr[1] = 0;
314 void *page_flip(int vsync)
317 /* page flipping not supported */
321 vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
323 backidx = (backidx + 1) & 1;
325 return vpgaddr[backidx];
329 static void blit_frame_lfb(void *pixels, int vsync)
331 if(vsync) wait_vsync();
332 memcpy64(vpgaddr[frontidx], pixels, pgsize >> 3);
335 static void blit_frame_banked(void *pixels, int vsync)
337 int sz, offs, pending;
338 unsigned char *pptr = pixels;
340 if(vsync) wait_vsync();
342 /* assume initial window offset at 0 */
346 sz = pending > 65536 ? 65536 : pending;
347 /*memcpy64(VMEM_PTR, pptr, sz >> 3);*/
348 memcpy(VMEM_PTR, pptr, sz);
351 offs += curmode->win_64k_step;
357 static uint32_t calc_mask(int sz, int pos)
361 mask = (mask << 1) | 1;
367 #define get_msr(msr, low, high) \
370 : "=a"(low), "=d"(high) \
373 #define set_msr(msr, low, high) \
376 :: "c"(msr), "a"(low), "d"(high))
378 #endif /* __GNUC__ */
381 #define get_msr(msr, low, high) get_msr_asm(msr, &low, &high)
383 void get_msr_asm(uint32_t msr, uint32_t *lowptr, uint32_t *highptr);
384 #pragma aux get_msr_asm = \
388 parm [ecx][ebx][esi] \
391 void set_msr(uint32_t msr, uint32_t low, uint32_t high);
392 #pragma aux set_msr = \
396 #endif /* __WATCOMC__ */
399 #define MSR_MTRRCAP 0xfe
400 #define MSR_MTRRDEFTYPE 0x2ff
401 #define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
402 #define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
403 #define MTRRDEF_EN 0x800
404 #define MTRRCAP_HAVE_WC 0x400
405 #define MTRRMASK_VALID 0x800
409 static int get_page_memtype(uint32_t addr, int num_ranges)
412 uint32_t rlow, rhigh;
415 for(i=0; i<num_ranges; i++) {
416 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
417 if(!(rlow & MTRRMASK_VALID)) {
420 mask = rlow & 0xfffff000;
422 get_msr(MSR_MTRRBASE(i), rlow, rhigh);
423 base = rlow & 0xfffff000;
425 if((addr & mask) == (base & mask)) {
430 get_msr(MSR_MTRRDEFTYPE, rlow, rhigh);
434 static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
437 if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
446 static int alloc_mtrr(int num_ranges)
449 uint32_t rlow, rhigh;
451 for(i=0; i<num_ranges; i++) {
452 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
453 if(!(rlow & MTRRMASK_VALID)) {
460 static void enable_wrcomb(uint32_t addr, int len)
462 int num_ranges, mtrr;
463 uint32_t rlow, rhigh;
466 if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
467 fprintf(stderr, "failed to enable write combining, unaligned range: %p/%x\n",
468 (void*)addr, (unsigned int)len);
472 get_msr(MSR_MTRRCAP, rlow, rhigh);
473 num_ranges = rlow & 0xff;
475 printf("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
477 if(!(rlow & MTRRCAP_HAVE_WC)) {
478 fprintf(stderr, "failed to enable write combining, processor doesn't support it\n");
482 if(check_wrcomb_enabled(addr, len, num_ranges)) {
486 if((mtrr = alloc_mtrr(num_ranges)) == -1) {
487 fprintf(stderr, "failed to enable write combining, no free MTRRs\n");
497 mask = ~mask & 0xfffff000;
499 printf(" ... mask: %08x\n", (unsigned int)mask);
502 get_msr(MSR_MTRRDEFTYPE, def, rhigh);
503 set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
505 set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
506 set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
508 set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
512 static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
514 static const char *mtrr_type_name(int type)
516 if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
517 return mtrr_names[0];
519 return mtrr_names[type];
522 static void print_mtrr(void)
525 uint32_t rlow, rhigh, base, mask;
527 get_msr(MSR_MTRRCAP, rlow, rhigh);
528 num_ranges = rlow & 0xff;
530 for(i=0; i<num_ranges; i++) {
531 get_msr(MSR_MTRRBASE(i), base, rhigh);
532 get_msr(MSR_MTRRMASK(i), mask, rhigh);
534 if(mask & MTRRMASK_VALID) {
535 printf("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
536 (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
538 printf("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,