1 // Code for manipulating VGA framebuffers.
3 // Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2001-2008 the LGPL VGABios developers Team
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "biosvar.h" // GET_BDA
9 #include "util.h" // memset_far
10 #include "vgatables.h" // find_vga_entry
13 // * extract hw code from framebuffer code
14 // * use clear_screen() in scroll code
15 // * read/write_char should take a position; should not take count
16 // * normalize params (don't use AX/BX/CX/etc.)
20 memcpy16_far(u16 d_seg, void *d_far, u16 s_seg, const void *s_far, size_t len)
22 memcpy_far(d_seg, d_far, s_seg, s_far, len);
26 /****************************************************************
28 ****************************************************************/
31 vgamem_copy_pl4(u8 xstart, u8 ysrc, u8 ydest, u8 cols, u8 nbcols,
34 u16 src = ysrc * cheight * nbcols + xstart;
35 u16 dest = ydest * cheight * nbcols + xstart;
36 outw(0x0105, VGAREG_GRDC_ADDRESS);
38 for (i = 0; i < cheight; i++)
39 memcpy_far(SEG_GRAPH, (void*)(dest + i * nbcols)
40 , SEG_GRAPH, (void*)(src + i * nbcols), cols);
41 outw(0x0005, VGAREG_GRDC_ADDRESS);
45 vgamem_fill_pl4(u8 xstart, u8 ystart, u8 cols, u8 nbcols, u8 cheight,
48 u16 dest = ystart * cheight * nbcols + xstart;
49 outw(0x0205, VGAREG_GRDC_ADDRESS);
51 for (i = 0; i < cheight; i++)
52 memset_far(SEG_GRAPH, (void*)(dest + i * nbcols), attr, cols);
53 outw(0x0005, VGAREG_GRDC_ADDRESS);
57 vgamem_copy_cga(u8 xstart, u8 ysrc, u8 ydest, u8 cols, u8 nbcols,
60 u16 src = ((ysrc * cheight * nbcols) >> 1) + xstart;
61 u16 dest = ((ydest * cheight * nbcols) >> 1) + xstart;
63 for (i = 0; i < cheight; i++)
65 memcpy_far(SEG_CTEXT, (void*)(0x2000 + dest + (i >> 1) * nbcols)
66 , SEG_CTEXT, (void*)(0x2000 + src + (i >> 1) * nbcols)
69 memcpy_far(SEG_CTEXT, (void*)(dest + (i >> 1) * nbcols)
70 , SEG_CTEXT, (void*)(src + (i >> 1) * nbcols), cols);
74 vgamem_fill_cga(u8 xstart, u8 ystart, u8 cols, u8 nbcols, u8 cheight,
77 u16 dest = ((ystart * cheight * nbcols) >> 1) + xstart;
79 for (i = 0; i < cheight; i++)
81 memset_far(SEG_CTEXT, (void*)(0x2000 + dest + (i >> 1) * nbcols)
84 memset_far(SEG_CTEXT, (void*)(dest + (i >> 1) * nbcols), attr, cols);
88 clear_screen(struct vgamode_s *vmode_g)
90 if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
91 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0720, 32*1024);
94 if (GET_GLOBAL(vmode_g->svgamode) < 0x0d) {
95 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 32*1024);
98 outb(0x02, VGAREG_SEQU_ADDRESS);
99 u8 mmask = inb(VGAREG_SEQU_DATA);
100 outb(0x0f, VGAREG_SEQU_DATA); // all planes
101 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 64*1024);
102 outb(mmask, VGAREG_SEQU_DATA);
106 biosfn_scroll(u8 nblines, u8 attr, u8 rul, u8 cul, u8 rlr, u8 clr, u8 page,
109 // page == 0xFF if current
116 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
120 // Get the dimensions
121 u16 nbrows = GET_BDA(video_rows) + 1;
122 u16 nbcols = GET_BDA(video_cols);
124 // Get the current page
126 page = GET_BDA(video_page);
132 if (nblines > nbrows)
134 u8 cols = clr - cul + 1;
136 if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
137 // Compute the address
138 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, page));
139 dprintf(3, "Scroll, address %p (%d %d %02x)\n"
140 , address_far, nbrows, nbcols, page);
142 if (nblines == 0 && rul == 0 && cul == 0 && rlr == nbrows - 1
143 && clr == nbcols - 1) {
144 memset16_far(GET_GLOBAL(vmode_g->sstart), address_far
145 , (u16)attr * 0x100 + ' ', nbrows * nbcols * 2);
146 } else { // if Scroll up
147 if (dir == SCROLL_UP) {
149 for (i = rul; i <= rlr; i++)
150 if ((i + nblines > rlr) || (nblines == 0))
151 memset16_far(GET_GLOBAL(vmode_g->sstart)
152 , address_far + (i * nbcols + cul) * 2
153 , (u16)attr * 0x100 + ' ', cols * 2);
155 memcpy16_far(GET_GLOBAL(vmode_g->sstart)
156 , address_far + (i * nbcols + cul) * 2
157 , GET_GLOBAL(vmode_g->sstart)
158 , (void*)(((i + nblines) * nbcols + cul) * 2)
162 for (i = rlr; i >= rul; i--) {
163 if ((i < rul + nblines) || (nblines == 0))
164 memset16_far(GET_GLOBAL(vmode_g->sstart)
165 , address_far + (i * nbcols + cul) * 2
166 , (u16)attr * 0x100 + ' ', cols * 2);
168 memcpy16_far(GET_GLOBAL(vmode_g->sstart)
169 , address_far + (i * nbcols + cul) * 2
170 , GET_GLOBAL(vmode_g->sstart)
171 , (void*)(((i - nblines) * nbcols + cul) * 2)
181 // FIXME gfx mode not complete
182 struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
183 u8 cheight = GET_GLOBAL(vparam_g->cheight);
184 switch (GET_GLOBAL(vmode_g->memmodel)) {
187 if (nblines == 0 && rul == 0 && cul == 0 && rlr == nbrows - 1
188 && clr == nbcols - 1) {
189 outw(0x0205, VGAREG_GRDC_ADDRESS);
190 memset_far(GET_GLOBAL(vmode_g->sstart), 0, attr,
191 nbrows * nbcols * cheight);
192 outw(0x0005, VGAREG_GRDC_ADDRESS);
193 } else { // if Scroll up
194 if (dir == SCROLL_UP) {
196 for (i = rul; i <= rlr; i++)
197 if ((i + nblines > rlr) || (nblines == 0))
198 vgamem_fill_pl4(cul, i, cols, nbcols, cheight,
201 vgamem_copy_pl4(cul, i + nblines, i, cols,
205 for (i = rlr; i >= rul; i--) {
206 if ((i < rul + nblines) || (nblines == 0))
207 vgamem_fill_pl4(cul, i, cols, nbcols, cheight,
210 vgamem_copy_pl4(cul, i, i - nblines, cols,
219 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
220 if (nblines == 0 && rul == 0 && cul == 0 && rlr == nbrows - 1
221 && clr == nbcols - 1) {
222 memset_far(GET_GLOBAL(vmode_g->sstart), 0, attr,
223 nbrows * nbcols * cheight * bpp);
231 if (dir == SCROLL_UP) {
233 for (i = rul; i <= rlr; i++)
234 if ((i + nblines > rlr) || (nblines == 0))
235 vgamem_fill_cga(cul, i, cols, nbcols, cheight,
238 vgamem_copy_cga(cul, i + nblines, i, cols,
242 for (i = rlr; i >= rul; i--) {
243 if ((i < rul + nblines) || (nblines == 0))
244 vgamem_fill_cga(cul, i, cols, nbcols, cheight,
247 vgamem_copy_cga(cul, i, i - nblines, cols,
257 dprintf(1, "Scroll in graphics mode\n");
262 /****************************************************************
263 * Read/write characters to screen
264 ****************************************************************/
267 write_gfx_char_pl4(struct cursorpos cp, struct carattr ca, u8 nbcols, u8 cheight)
280 u16 addr = cp.x + cp.y * cheight * nbcols;
281 u16 src = ca.car * cheight;
282 outw(0x0f02, VGAREG_SEQU_ADDRESS);
283 outw(0x0205, VGAREG_GRDC_ADDRESS);
285 outw(0x1803, VGAREG_GRDC_ADDRESS);
287 outw(0x0003, VGAREG_GRDC_ADDRESS);
289 for (i = 0; i < cheight; i++) {
290 u8 *dest_far = (void*)(addr + i * nbcols);
292 for (j = 0; j < 8; j++) {
294 outw((mask << 8) | 0x08, VGAREG_GRDC_ADDRESS);
295 GET_FARVAR(SEG_GRAPH, *dest_far);
296 if (GET_GLOBAL(fdata_g[src + i]) & mask)
297 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
299 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
302 outw(0xff08, VGAREG_GRDC_ADDRESS);
303 outw(0x0005, VGAREG_GRDC_ADDRESS);
304 outw(0x0003, VGAREG_GRDC_ADDRESS);
308 write_gfx_char_cga(struct cursorpos cp, struct carattr ca, u8 nbcols, u8 bpp)
310 u8 *fdata_g = vgafont8;
311 u16 addr = (cp.x * bpp) + cp.y * 320;
312 u16 src = ca.car * 8;
314 for (i = 0; i < 8; i++) {
315 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
322 data = GET_FARVAR(SEG_CTEXT, *dest_far);
324 for (j = 0; j < 8; j++) {
325 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
327 data ^= (ca.attr & 0x01) << (7 - j);
329 data |= (ca.attr & 0x01) << (7 - j);
333 SET_FARVAR(SEG_CTEXT, *dest_far, data);
338 data = GET_FARVAR(SEG_CTEXT, *dest_far);
340 for (j = 0; j < 4; j++) {
341 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
343 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
345 data |= (ca.attr & 0x03) << ((3 - j) * 2);
349 SET_FARVAR(SEG_CTEXT, *dest_far, data);
357 write_gfx_char_lin(struct cursorpos cp, struct carattr ca, u8 nbcols)
359 u8 *fdata_g = vgafont8;
360 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
361 u16 src = ca.car * 8;
363 for (i = 0; i < 8; i++) {
364 u8 *dest_far = (void*)(addr + i * nbcols * 8);
367 for (j = 0; j < 8; j++) {
369 if (GET_GLOBAL(fdata_g[src + i]) & mask)
371 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
378 vgafb_write_char(u8 page, struct carattr ca, u16 count)
381 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
385 // Get the cursor pos for the page
386 struct cursorpos cp = get_cursor_pos(page);
388 // Get the dimensions
389 u16 nbrows = GET_BDA(video_rows) + 1;
390 u16 nbcols = GET_BDA(video_cols);
392 if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
393 // Compute the address
394 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
395 + (cp.x + cp.y * nbcols) * 2);
398 u16 dummy = (ca.attr << 8) | ca.car;
399 memset16_far(GET_GLOBAL(vmode_g->sstart), address_far, dummy
402 while (count-- > 0) {
403 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far
411 // FIXME gfx mode not complete
412 struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
413 u8 cheight = GET_GLOBAL(vparam_g->cheight);
414 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
415 while ((count-- > 0) && (cp.x < nbcols)) {
416 switch (GET_GLOBAL(vmode_g->memmodel)) {
419 write_gfx_char_pl4(cp, ca, nbcols, cheight);
422 write_gfx_char_cga(cp, ca, nbcols, bpp);
425 write_gfx_char_lin(cp, ca, nbcols);
433 vgafb_read_char(u8 page)
436 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
440 // Get the cursor pos for the page
441 struct cursorpos cp = get_cursor_pos(page);
443 // Get the dimensions
444 u16 nbrows = GET_BDA(video_rows) + 1;
445 u16 nbcols = GET_BDA(video_cols);
447 if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
448 // Compute the address
449 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
450 + (cp.x + cp.y * nbcols) * 2);
451 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
452 struct carattr ca = {v, v>>8, 0};
457 dprintf(1, "Read char in graphics mode\n");
459 struct carattr ca = {0, 0, 0};
464 /****************************************************************
466 ****************************************************************/
469 biosfn_write_pixel(u8 BH, u8 AL, u16 CX, u16 DX)
472 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
475 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
478 u8 *addr_far, mask, attr, data;
479 switch (GET_GLOBAL(vmode_g->memmodel)) {
482 addr_far = (void*)(CX / 8 + DX * GET_BDA(video_cols));
483 mask = 0x80 >> (CX & 0x07);
484 outw((mask << 8) | 0x08, VGAREG_GRDC_ADDRESS);
485 outw(0x0205, VGAREG_GRDC_ADDRESS);
486 data = GET_FARVAR(SEG_GRAPH, *addr_far);
488 outw(0x1803, VGAREG_GRDC_ADDRESS);
489 SET_FARVAR(SEG_GRAPH, *addr_far, AL);
490 outw(0xff08, VGAREG_GRDC_ADDRESS);
491 outw(0x0005, VGAREG_GRDC_ADDRESS);
492 outw(0x0003, VGAREG_GRDC_ADDRESS);
495 if (GET_GLOBAL(vmode_g->pixbits) == 2)
496 addr_far = (void*)((CX >> 2) + (DX >> 1) * 80);
498 addr_far = (void*)((CX >> 3) + (DX >> 1) * 80);
501 data = GET_FARVAR(SEG_CTEXT, *addr_far);
502 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
503 attr = (AL & 0x03) << ((3 - (CX & 0x03)) * 2);
504 mask = 0x03 << ((3 - (CX & 0x03)) * 2);
506 attr = (AL & 0x01) << (7 - (CX & 0x07));
507 mask = 0x01 << (7 - (CX & 0x07));
515 SET_FARVAR(SEG_CTEXT, *addr_far, data);
518 addr_far = (void*)(CX + DX * (GET_BDA(video_cols) * 8));
519 SET_FARVAR(SEG_GRAPH, *addr_far, AL);
525 biosfn_read_pixel(u8 BH, u16 CX, u16 DX, u16 *AX)
528 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
531 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
534 u8 *addr_far, mask, attr=0, data, i;
535 switch (GET_GLOBAL(vmode_g->memmodel)) {
538 addr_far = (void*)(CX / 8 + DX * GET_BDA(video_cols));
539 mask = 0x80 >> (CX & 0x07);
541 for (i = 0; i < 4; i++) {
542 outw((i << 8) | 0x04, VGAREG_GRDC_ADDRESS);
543 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
549 addr_far = (void*)((CX >> 2) + (DX >> 1) * 80);
552 data = GET_FARVAR(SEG_CTEXT, *addr_far);
553 if (GET_GLOBAL(vmode_g->pixbits) == 2)
554 attr = (data >> ((3 - (CX & 0x03)) * 2)) & 0x03;
556 attr = (data >> (7 - (CX & 0x07))) & 0x01;
559 addr_far = (void*)(CX + DX * (GET_BDA(video_cols) * 8));
560 attr = GET_FARVAR(SEG_GRAPH, *addr_far);
563 *AX = (*AX & 0xff00) | attr;
567 /****************************************************************
569 ****************************************************************/
572 vgafb_load_font(u16 seg, void *src_far, u16 count
573 , u16 start, u8 destflags, u8 fontsize)
576 u16 blockaddr = ((destflags & 0x03) << 14) + ((destflags & 0x04) << 11);
577 void *dest_far = (void*)(blockaddr + start*32);
579 for (i = 0; i < count; i++)
580 memcpy_far(SEG_GRAPH, dest_far + i*32
581 , seg, src_far + i*fontsize, fontsize);
582 release_font_access();