11 #define VMEM_PTR ((void*)(0xa0000 + __djgpp_conventional_base))
13 #define VMEM_PTR ((void*)0xa0000)
16 #define SAME_BPP(a, b) \
17 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
18 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
20 void (*blit_frame)(void*, int);
22 int resizefb(int x, int y, int bpp, int pitch);
24 static void blit_frame_lfb(void *pixels, int vsync);
25 static void blit_frame_banked(void *pixels, int vsync);
26 static uint32_t calc_mask(int sz, int pos);
28 static void enable_wrcomb(uint32_t addr, int len);
29 static void print_mtrr(void);
31 static struct video_mode *vmodes;
32 static int num_vmodes;
34 static int vbe_init_ver;
35 static struct vbe_info vbe;
38 static struct video_mode *curmode;
39 static void *vpgaddr[2];
40 static int frontidx, backidx;
41 static int pgcount, pgsize, fbsize;
46 int i, num, max_modes;
47 struct video_mode *vmptr;
49 if(vbe_info(&vbe) == -1) {
50 fprintf(stderr, "failed to retrieve VBE information\n");
53 vbe_print_info(stdout, &vbe);
57 if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
58 fprintf(stderr, "failed to allocate video modes list\n");
62 num = vbe_num_modes(&vbe);
63 for(i=0; i<num; i++) {
64 struct vbe_mode_info minf;
66 if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
70 if(num_vmodes >= max_modes) {
71 int newmax = max_modes ? (max_modes << 1) : 16;
72 if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
73 fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
81 vmptr = vmodes + num_vmodes++;
82 memset(vmptr, 0, sizeof *vmptr);
83 vmptr->mode = vbe.modes[i];
84 vmptr->xsz = minf.xres;
85 vmptr->ysz = minf.yres;
86 vmptr->bpp = minf.bpp;
87 vmptr->pitch = minf.scanline_bytes;
88 if(minf.mem_model == VBE_TYPE_DIRECT) {
89 vmptr->rbits = minf.rsize;
90 vmptr->gbits = minf.gsize;
91 vmptr->bbits = minf.bsize;
92 vmptr->rshift = minf.rpos;
93 vmptr->gshift = minf.gpos;
94 vmptr->bshift = minf.bpos;
95 vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
96 vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
97 vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
98 /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
100 if(minf.attr & VBE_ATTR_LFB) {
101 vmptr->fb_addr = minf.fb_addr;
103 vmptr->max_pages = minf.num_img_pages;
104 vmptr->win_gran = minf.win_gran;
106 printf("%04x: ", vbe.modes[i]);
107 vbe_print_mode_info(stdout, &minf);
111 vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
115 void cleanup_video(void)
120 struct video_mode *video_modes(void)
125 int num_video_modes(void)
130 struct video_mode *get_video_mode(int idx)
132 if(idx == VMODE_CURRENT) {
138 int match_video_mode(int xsz, int ysz, int bpp)
141 struct video_mode *vm;
143 for(i=0; i<num_vmodes; i++) {
145 if(vm->xsz != xsz || vm->ysz != ysz) continue;
146 if(SAME_BPP(vm->bpp, bpp)) {
149 if(vm->bpp == bpp) break;
153 fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
159 int find_video_mode(int mode)
162 struct video_mode *vm;
165 for(i=0; i<num_vmodes; i++) {
166 if(vm->mode == mode) return i;
171 void *set_video_mode(int idx, int nbuf)
174 struct video_mode *vm = vmodes + idx;
175 struct cpuid_info cpu;
177 if(curmode == vm) return vpgaddr[0];
179 printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
180 vm->xsz, vm->ysz, vm->bpp);
183 mode = vm->mode | VBE_MODE_LFB;
184 if(vbe_setmode(mode) == -1) {
186 if(vbe_setmode(mode) == -1) {
187 fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
190 printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
193 /* unmap previous video memory mapping, if there was one (switching modes) */
194 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
195 dpmi_munmap(vpgaddr[0]);
196 vpgaddr[0] = vpgaddr[1] = 0;
200 if(nbuf < 1) nbuf = 1;
201 if(nbuf > 2) nbuf = 2;
202 pgcount = nbuf > vm->max_pages + 1 ? vm->max_pages + 1 : nbuf;
203 pgsize = vm->ysz * vm->pitch;
204 fbsize = pgcount * pgsize;
207 printf("rgb mask: %x %x %x\n", (unsigned int)vm->rmask,
208 (unsigned int)vm->gmask, (unsigned int)vm->bmask);
209 printf("rgb shift: %d %d %d\n", vm->rshift, vm->gshift, vm->bshift);
211 printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
213 printf("phys addr: %p\n", (void*)vm->fb_addr);
218 vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
220 fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
221 (unsigned long)vm->fb_addr, fbsize);
225 memset(vpgaddr[0], 0xaa, pgsize);
228 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
230 page_flip(FLIP_NOW); /* start with the second page visible */
232 frontidx = backidx = 0;
236 blit_frame = blit_frame_lfb;
238 if(read_cpuid(&cpu) != -1 && cpu.feat & CPUID_FEAT_MTRR) {
240 enable_wrcomb(vm->fb_addr, fbsize);
244 vpgaddr[0] = VMEM_PTR;
247 blit_frame = blit_frame_banked;
249 /* calculate window granularity shift */
250 vm->win_gran_shift = 0;
251 vm->win_64k_step = 1;
252 if(vm->win_gran > 0 && vm->win_gran < 64) {
253 int gran = vm->win_gran;
255 vm->win_gran_shift++;
258 vm->win_64k_step = 1 << vm->win_gran_shift;
261 printf("granularity: %dk (step: %d)\n", vm->win_gran, vm->win_64k_step);
264 /* allocate main memory framebuffer */
265 if(resizefb(vm->xsz, vm->ysz, vm->bpp, vm->pitch) == -1) {
266 fprintf(stderr, "failed to allocate %dx%d (%d bpp) framebuffer\n", vm->xsz,
276 int set_text_mode(void)
278 /* unmap previous video memory mapping, if there was one (switching modes) */
279 if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
280 dpmi_munmap(vpgaddr[0]);
281 vpgaddr[0] = vpgaddr[1] = 0;
289 void *page_flip(int vsync)
292 /* page flipping not supported */
296 vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
298 backidx = (backidx + 1) & 1;
300 return vpgaddr[backidx];
304 static void blit_frame_lfb(void *pixels, int vsync)
306 if(vsync) wait_vsync();
307 memcpy64(vpgaddr[frontidx], pixels, pgsize >> 3);
310 static void blit_frame_banked(void *pixels, int vsync)
312 int sz, offs, pending;
313 unsigned char *pptr = pixels;
315 if(vsync) wait_vsync();
317 /* assume initial window offset at 0 */
321 sz = pending > 65536 ? 65536 : pending;
322 /*memcpy64(VMEM_PTR, pptr, sz >> 3);*/
323 memcpy(VMEM_PTR, pptr, sz);
326 offs += curmode->win_64k_step;
332 static uint32_t calc_mask(int sz, int pos)
336 mask = (mask << 1) | 1;
341 #define get_msr(msr, low, high) \
344 : "=a"(low), "=d"(high) \
347 #define set_msr(msr, low, high) \
350 :: "c"(msr), "a"(low), "d"(high))
352 #define MSR_MTRRCAP 0xfe
353 #define MSR_MTRRDEFTYPE 0x2ff
354 #define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
355 #define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
356 #define MTRRDEF_EN 0x800
357 #define MTRRCAP_HAVE_WC 0x400
358 #define MTRRMASK_VALID 0x800
362 static int get_page_memtype(uint32_t addr, int num_ranges)
365 uint32_t rlow, rhigh;
368 for(i=0; i<num_ranges; i++) {
369 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
370 if(!(rlow & MTRRMASK_VALID)) {
374 get_msr(MSR_MTRRBASE(i), rlow, rhigh);
375 base = rlow & 0xfffff000;
376 mask = rlow & 0xfffff000;
378 if((addr & mask) == (base & mask)) {
383 get_msr(MSR_MTRRDEFTYPE, rlow, rhigh);
387 static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
390 if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
399 static int alloc_mtrr(int num_ranges)
402 uint32_t rlow, rhigh;
404 for(i=0; i<num_ranges; i++) {
405 get_msr(MSR_MTRRMASK(i), rlow, rhigh);
406 if(!(rlow & MTRRMASK_VALID)) {
413 static void enable_wrcomb(uint32_t addr, int len)
415 int num_ranges, mtrr;
416 uint32_t rlow, rhigh;
419 if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
420 fprintf(stderr, "failed to enable write combining, unaligned range: %p/%x\n",
421 (void*)addr, (unsigned int)len);
425 get_msr(MSR_MTRRCAP, rlow, rhigh);
426 num_ranges = rlow & 0xff;
428 printf("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
430 if(!(rlow & MTRRCAP_HAVE_WC)) {
431 fprintf(stderr, "failed to enable write combining, processor doesn't support it\n");
435 if(check_wrcomb_enabled(addr, len, num_ranges)) {
439 if((mtrr = alloc_mtrr(num_ranges)) == -1) {
440 fprintf(stderr, "failed to enable write combining, no free MTRRs\n");
450 mask = ~mask & 0xfffff000;
452 printf(" ... mask: %08x\n", (unsigned int)mask);
455 get_msr(MSR_MTRRDEFTYPE, def, rhigh);
456 set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
458 set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
459 set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
461 set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
465 static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
467 static const char *mtrr_type_name(int type)
469 if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
470 return mtrr_names[0];
472 return mtrr_names[type];
475 static void print_mtrr(void)
478 uint32_t rlow, rhigh, base, mask;
480 get_msr(MSR_MTRRCAP, rlow, rhigh);
481 num_ranges = rlow & 0xff;
483 for(i=0; i<num_ranges; i++) {
484 get_msr(MSR_MTRRBASE(i), base, rhigh);
485 get_msr(MSR_MTRRMASK(i), mask, rhigh);
487 if(mask & MTRRMASK_VALID) {
488 printf("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
489 (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
491 printf("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,