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 "vgabios.h" // find_vga_entry
11 #include "stdvga.h" // vgahw_grdc_write
14 /****************************************************************
16 ****************************************************************/
19 memcpy_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines)
21 for (; lines; lines--, dst+=stride, src+=stride)
22 memcpy_far(seg, dst, seg, src, copylen);
27 memset_stride(u16 seg, void *dst, u8 val, int setlen, int stride, int lines)
29 for (; lines; lines--, dst+=stride)
30 memset_far(seg, dst, val, setlen);
34 memset16_stride(u16 seg, void *dst, u16 val, int setlen, int stride, int lines)
36 for (; lines; lines--, dst+=stride)
37 memset16_far(seg, dst, val, setlen);
41 scroll_pl4(struct vgamode_s *vmode_g, int nblines, int attr
42 , struct cursorpos ul, struct cursorpos lr)
44 u8 cheight = GET_GLOBAL(vmode_g->cheight);
45 int stride = GET_BDA(video_cols);
46 void *src_far, *dest_far;
48 dest_far = (void*)(ul.y * cheight * stride + ul.x);
49 src_far = dest_far + nblines * cheight * stride;
53 dest_far = (void*)(lr.y * cheight * stride + ul.x);
54 src_far = dest_far - nblines * cheight * stride;
57 int cols = lr.x - ul.x + 1;
58 int rows = lr.y - ul.y + 1;
60 vgahw_grdc_write(0x05, 0x01);
61 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols, stride
62 , (rows - nblines) * cheight);
66 vgahw_grdc_write(0x05, 0x02);
67 memset_stride(SEG_GRAPH, dest_far, attr, cols, stride, nblines * cheight);
68 vgahw_grdc_write(0x05, 0x00);
72 scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
73 , struct cursorpos ul, struct cursorpos lr)
75 u8 cheight = GET_GLOBAL(vmode_g->cheight);
76 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
77 int stride = GET_BDA(video_cols) * bpp;
78 void *src_far, *dest_far;
80 dest_far = (void*)(ul.y * cheight * stride + ul.x * bpp);
81 src_far = dest_far + nblines * cheight * stride;
85 dest_far = (void*)(lr.y * cheight * stride + ul.x * bpp);
86 src_far = dest_far - nblines * cheight * stride;
89 int cols = (lr.x - ul.x + 1) * bpp;
90 int rows = lr.y - ul.y + 1;
92 memcpy_stride(SEG_CTEXT, dest_far + 0x2000, src_far + 0x2000, cols
93 , stride, (rows - nblines) * cheight / 2);
94 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols
95 , stride, (rows - nblines) * cheight / 2);
99 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols
100 , stride, nblines * cheight / 2);
101 memset_stride(SEG_CTEXT, dest_far, attr, cols
102 , stride, nblines * cheight / 2);
106 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
107 , struct cursorpos ul, struct cursorpos lr)
109 u16 nbrows = GET_BDA(video_rows) + 1;
110 u16 nbcols = GET_BDA(video_cols);
111 void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
112 int stride = nbcols * 2;
114 dest_far += ul.y * stride + ul.x * 2;
115 src_far = dest_far + nblines * stride;
119 dest_far += lr.y * stride + ul.x * 2;
120 src_far = dest_far - nblines * stride;
123 int cols = (lr.x - ul.x + 1) * 2;
124 int rows = lr.y - ul.y + 1;
125 u16 seg = GET_GLOBAL(vmode_g->sstart);
127 dest_far = memcpy_stride(seg, dest_far, src_far, cols, stride
131 attr = (attr << 8) | ' ';
132 memset16_stride(seg, dest_far, attr, cols, stride, nblines);
136 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
139 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
143 // FIXME gfx mode not complete
144 switch (GET_GLOBAL(vmode_g->memmodel)) {
147 scroll_text(vmode_g, nblines, attr, ul, lr);
151 scroll_pl4(vmode_g, nblines, attr, ul, lr);
154 scroll_cga(vmode_g, nblines, attr, ul, lr);
157 dprintf(1, "Scroll in graphics mode\n");
162 clear_screen(struct vgamode_s *vmode_g)
164 switch (GET_GLOBAL(vmode_g->memmodel)) {
167 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0720, 32*1024);
170 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 32*1024);
173 // XXX - old code gets/sets/restores sequ register 2 to 0xf -
174 // but it should always be 0xf anyway.
175 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 64*1024);
180 /****************************************************************
181 * Read/write characters to screen
182 ****************************************************************/
185 write_gfx_char_pl4(struct vgamode_s *vmode_g
186 , struct cursorpos cp, struct carattr ca)
188 u16 nbcols = GET_BDA(video_cols);
192 u8 cheight = GET_GLOBAL(vmode_g->cheight);
204 u16 addr = cp.x + cp.y * cheight * nbcols;
205 u16 src = ca.car * cheight;
206 vgahw_sequ_write(0x02, 0x0f);
207 vgahw_grdc_write(0x05, 0x02);
209 vgahw_grdc_write(0x03, 0x18);
211 vgahw_grdc_write(0x03, 0x00);
213 for (i = 0; i < cheight; i++) {
214 u8 *dest_far = (void*)(addr + i * nbcols);
216 for (j = 0; j < 8; j++) {
218 vgahw_grdc_write(0x08, mask);
219 GET_FARVAR(SEG_GRAPH, *dest_far);
220 if (GET_GLOBAL(fdata_g[src + i]) & mask)
221 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
223 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
226 vgahw_grdc_write(0x08, 0xff);
227 vgahw_grdc_write(0x05, 0x00);
228 vgahw_grdc_write(0x03, 0x00);
232 write_gfx_char_cga(struct vgamode_s *vmode_g
233 , struct cursorpos cp, struct carattr ca)
235 u16 nbcols = GET_BDA(video_cols);
239 u8 *fdata_g = vgafont8;
240 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
241 u16 addr = (cp.x * bpp) + cp.y * 320;
242 u16 src = ca.car * 8;
244 for (i = 0; i < 8; i++) {
245 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
252 data = GET_FARVAR(SEG_CTEXT, *dest_far);
254 for (j = 0; j < 8; j++) {
255 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
257 data ^= (ca.attr & 0x01) << (7 - j);
259 data |= (ca.attr & 0x01) << (7 - j);
263 SET_FARVAR(SEG_CTEXT, *dest_far, data);
268 data = GET_FARVAR(SEG_CTEXT, *dest_far);
270 for (j = 0; j < 4; j++) {
271 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
273 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
275 data |= (ca.attr & 0x03) << ((3 - j) * 2);
279 SET_FARVAR(SEG_CTEXT, *dest_far, data);
287 write_gfx_char_lin(struct vgamode_s *vmode_g
288 , struct cursorpos cp, struct carattr ca)
290 // Get the dimensions
291 u16 nbcols = GET_BDA(video_cols);
295 u8 *fdata_g = vgafont8;
296 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
297 u16 src = ca.car * 8;
299 for (i = 0; i < 8; i++) {
300 u8 *dest_far = (void*)(addr + i * nbcols * 8);
303 for (j = 0; j < 8; j++) {
305 if (GET_GLOBAL(fdata_g[src + i]) & mask)
307 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
314 write_text_char(struct vgamode_s *vmode_g
315 , struct cursorpos cp, struct carattr ca)
317 // Get the dimensions
318 u16 nbrows = GET_BDA(video_rows) + 1;
319 u16 nbcols = GET_BDA(video_cols);
321 // Compute the address
322 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
323 + (cp.x + cp.y * nbcols) * 2);
326 u16 dummy = (ca.attr << 8) | ca.car;
327 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
329 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
334 vgafb_write_char(struct cursorpos cp, struct carattr ca)
337 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
341 // FIXME gfx mode not complete
342 switch (GET_GLOBAL(vmode_g->memmodel)) {
345 write_text_char(vmode_g, cp, ca);
349 write_gfx_char_pl4(vmode_g, cp, ca);
352 write_gfx_char_cga(vmode_g, cp, ca);
355 write_gfx_char_lin(vmode_g, cp, ca);
361 vgafb_read_char(struct cursorpos cp)
364 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
368 if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
370 dprintf(1, "Read char in graphics mode\n");
374 // Get the dimensions
375 u16 nbrows = GET_BDA(video_rows) + 1;
376 u16 nbcols = GET_BDA(video_cols);
378 // Compute the address
379 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
380 + (cp.x + cp.y * nbcols) * 2);
381 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
382 struct carattr ca = {v, v>>8, 0};
386 struct carattr ca2 = {0, 0, 0};
391 /****************************************************************
393 ****************************************************************/
396 vgafb_write_pixel(u8 color, u16 x, u16 y)
399 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
402 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
405 u8 *addr_far, mask, attr, data;
406 switch (GET_GLOBAL(vmode_g->memmodel)) {
409 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
410 mask = 0x80 >> (x & 0x07);
411 vgahw_grdc_write(0x08, mask);
412 vgahw_grdc_write(0x05, 0x02);
413 data = GET_FARVAR(SEG_GRAPH, *addr_far);
415 vgahw_grdc_write(0x03, 0x18);
416 SET_FARVAR(SEG_GRAPH, *addr_far, color);
417 vgahw_grdc_write(0x08, 0xff);
418 vgahw_grdc_write(0x05, 0x00);
419 vgahw_grdc_write(0x03, 0x00);
422 if (GET_GLOBAL(vmode_g->pixbits) == 2)
423 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
425 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
428 data = GET_FARVAR(SEG_CTEXT, *addr_far);
429 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
430 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
431 mask = 0x03 << ((3 - (x & 0x03)) * 2);
433 attr = (color & 0x01) << (7 - (x & 0x07));
434 mask = 0x01 << (7 - (x & 0x07));
442 SET_FARVAR(SEG_CTEXT, *addr_far, data);
445 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
446 SET_FARVAR(SEG_GRAPH, *addr_far, color);
452 vgafb_read_pixel(u16 x, u16 y)
455 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
458 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
461 u8 *addr_far, mask, attr=0, data, i;
462 switch (GET_GLOBAL(vmode_g->memmodel)) {
465 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
466 mask = 0x80 >> (x & 0x07);
468 for (i = 0; i < 4; i++) {
469 vgahw_grdc_write(0x04, i);
470 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
476 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
479 data = GET_FARVAR(SEG_CTEXT, *addr_far);
480 if (GET_GLOBAL(vmode_g->pixbits) == 2)
481 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
483 attr = (data >> (7 - (x & 0x07))) & 0x01;
486 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
487 attr = GET_FARVAR(SEG_GRAPH, *addr_far);
494 /****************************************************************
496 ****************************************************************/
499 vgafb_load_font(u16 seg, void *src_far, u16 count
500 , u16 start, u8 destflags, u8 fontsize)
503 u16 blockaddr = ((destflags & 0x03) << 14) + ((destflags & 0x04) << 11);
504 void *dest_far = (void*)(blockaddr + start*32);
506 for (i = 0; i < count; i++)
507 memcpy_far(SEG_GRAPH, dest_far + i*32
508 , seg, src_far + i*fontsize, fontsize);
509 release_font_access();