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 "vgahw.h" // vgahw_find_mode
11 #include "stdvga.h" // stdvga_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 int cheight = GET_GLOBAL(vmode_g->cheight);
46 int stride = GET_BDA(video_cols) * cwidth;
47 void *src_far, *dest_far;
49 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
50 src_far = dest_far + nblines * cheight * stride;
54 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
55 src_far = dest_far - nblines * cheight * stride;
58 int cols = lr.x - ul.x + 1;
59 int rows = lr.y - ul.y + 1;
61 stdvga_grdc_write(0x05, 0x01);
62 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
63 , stride, (rows - nblines) * cheight);
67 stdvga_grdc_write(0x05, 0x02);
68 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
69 , stride, nblines * cheight);
70 stdvga_grdc_write(0x05, 0x00);
74 scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
75 , struct cursorpos ul, struct cursorpos lr)
77 int cheight = GET_GLOBAL(vmode_g->cheight) / 2;
78 int cwidth = GET_GLOBAL(vmode_g->depth);
79 int stride = GET_BDA(video_cols) * cwidth;
80 void *src_far, *dest_far;
82 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
83 src_far = dest_far + nblines * cheight * stride;
87 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
88 src_far = dest_far - nblines * cheight * stride;
91 int cols = lr.x - ul.x + 1;
92 int rows = lr.y - ul.y + 1;
94 memcpy_stride(SEG_CTEXT, dest_far+0x2000, src_far+0x2000, cols * cwidth
95 , stride, (rows - nblines) * cheight);
96 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols * cwidth
97 , stride, (rows - nblines) * cheight);
101 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols * cwidth
102 , stride, nblines * cheight);
103 memset_stride(SEG_CTEXT, dest_far, attr, cols * cwidth
104 , stride, nblines * cheight);
108 scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr
109 , struct cursorpos ul, struct cursorpos lr)
113 int stride = GET_BDA(video_cols) * cwidth;
114 void *src_far, *dest_far;
116 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
117 src_far = dest_far + nblines * cheight * stride;
121 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
122 src_far = dest_far - nblines * cheight * stride;
125 int cols = lr.x - ul.x + 1;
126 int rows = lr.y - ul.y + 1;
128 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
129 , stride, (rows - nblines) * cheight);
132 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
133 , stride, nblines * cheight);
137 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
138 , struct cursorpos ul, struct cursorpos lr)
142 int stride = GET_BDA(video_cols) * cwidth;
143 void *src_far, *dest_far = (void*)(GET_BDA(video_pagesize) * ul.page);
145 dest_far += ul.y * cheight * stride + ul.x * cwidth;
146 src_far = dest_far + nblines * cheight * stride;
150 dest_far += lr.y * cheight * stride + ul.x * cwidth;
151 src_far = dest_far - nblines * cheight * stride;
154 int cols = lr.x - ul.x + 1;
155 int rows = lr.y - ul.y + 1;
156 u16 seg = GET_GLOBAL(vmode_g->sstart);
158 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
159 , stride, (rows - nblines) * cheight);
162 attr = (attr << 8) | ' ';
163 memset16_stride(seg, dest_far, attr, cols * cwidth
164 , stride, nblines * cheight);
168 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
171 struct vgamode_s *vmode_g = vgahw_find_mode(GET_BDA(video_mode));
175 // FIXME gfx mode not complete
176 switch (GET_GLOBAL(vmode_g->memmodel)) {
178 scroll_text(vmode_g, nblines, attr, ul, lr);
181 scroll_pl4(vmode_g, nblines, attr, ul, lr);
184 scroll_cga(vmode_g, nblines, attr, ul, lr);
188 scroll_lin(vmode_g, nblines, attr, ul, lr);
194 /****************************************************************
195 * Read/write characters to screen
196 ****************************************************************/
199 write_gfx_char_pl4(struct vgamode_s *vmode_g
200 , struct cursorpos cp, struct carattr ca)
202 u16 nbcols = GET_BDA(video_cols);
206 u8 cheight = GET_GLOBAL(vmode_g->cheight);
218 u16 addr = cp.x + cp.y * cheight * nbcols;
219 u16 src = ca.car * cheight;
220 stdvga_sequ_write(0x02, 0x0f);
221 stdvga_grdc_write(0x05, 0x02);
223 stdvga_grdc_write(0x03, 0x18);
225 stdvga_grdc_write(0x03, 0x00);
227 for (i = 0; i < cheight; i++) {
228 u8 *dest_far = (void*)(addr + i * nbcols);
230 for (j = 0; j < 8; j++) {
232 stdvga_grdc_write(0x08, mask);
233 GET_FARVAR(SEG_GRAPH, *(volatile u8*)dest_far);
234 if (GET_GLOBAL(fdata_g[src + i]) & mask)
235 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
237 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
240 stdvga_grdc_write(0x08, 0xff);
241 stdvga_grdc_write(0x05, 0x00);
242 stdvga_grdc_write(0x03, 0x00);
246 write_gfx_char_cga(struct vgamode_s *vmode_g
247 , struct cursorpos cp, struct carattr ca)
249 u16 nbcols = GET_BDA(video_cols);
253 u8 *fdata_g = vgafont8;
254 u8 bpp = GET_GLOBAL(vmode_g->depth);
255 u16 addr = (cp.x * bpp) + cp.y * 320;
256 u16 src = ca.car * 8;
258 for (i = 0; i < 8; i++) {
259 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
266 data = GET_FARVAR(SEG_CTEXT, *dest_far);
268 for (j = 0; j < 8; j++) {
269 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
271 data ^= (ca.attr & 0x01) << (7 - j);
273 data |= (ca.attr & 0x01) << (7 - j);
277 SET_FARVAR(SEG_CTEXT, *dest_far, data);
282 data = GET_FARVAR(SEG_CTEXT, *dest_far);
284 for (j = 0; j < 4; j++) {
285 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
287 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
289 data |= (ca.attr & 0x03) << ((3 - j) * 2);
293 SET_FARVAR(SEG_CTEXT, *dest_far, data);
301 write_gfx_char_lin(struct vgamode_s *vmode_g
302 , struct cursorpos cp, struct carattr ca)
304 // Get the dimensions
305 u16 nbcols = GET_BDA(video_cols);
309 u8 *fdata_g = vgafont8;
310 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
311 u16 src = ca.car * 8;
313 for (i = 0; i < 8; i++) {
314 u8 *dest_far = (void*)(addr + i * nbcols * 8);
317 for (j = 0; j < 8; j++) {
319 if (GET_GLOBAL(fdata_g[src + i]) & mask)
321 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
328 write_text_char(struct vgamode_s *vmode_g
329 , struct cursorpos cp, struct carattr ca)
331 // Compute the address
332 u16 nbcols = GET_BDA(video_cols);
333 void *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
334 + (cp.x + cp.y * nbcols) * 2);
337 u16 dummy = (ca.attr << 8) | ca.car;
338 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
340 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
345 vgafb_write_char(struct cursorpos cp, struct carattr ca)
348 struct vgamode_s *vmode_g = vgahw_find_mode(GET_BDA(video_mode));
352 // FIXME gfx mode not complete
353 switch (GET_GLOBAL(vmode_g->memmodel)) {
355 write_text_char(vmode_g, cp, ca);
358 write_gfx_char_pl4(vmode_g, cp, ca);
361 write_gfx_char_cga(vmode_g, cp, ca);
365 write_gfx_char_lin(vmode_g, cp, ca);
371 vgafb_read_char(struct cursorpos cp)
374 struct vgamode_s *vmode_g = vgahw_find_mode(GET_BDA(video_mode));
378 if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) {
380 dprintf(1, "Read char in graphics mode\n");
384 // Compute the address
385 u16 nbcols = GET_BDA(video_cols);
386 u16 *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
387 + (cp.x + cp.y * nbcols) * 2);
388 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
389 struct carattr ca = {v, v>>8, 0};
393 struct carattr ca2 = {0, 0, 0};
398 /****************************************************************
400 ****************************************************************/
403 vgafb_write_pixel(u8 color, u16 x, u16 y)
406 struct vgamode_s *vmode_g = vgahw_find_mode(GET_BDA(video_mode));
410 u8 *addr_far, mask, attr, data;
411 switch (GET_GLOBAL(vmode_g->memmodel)) {
413 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
414 mask = 0x80 >> (x & 0x07);
415 stdvga_grdc_write(0x08, mask);
416 stdvga_grdc_write(0x05, 0x02);
417 GET_FARVAR(SEG_GRAPH, *(volatile u8*)addr_far);
419 stdvga_grdc_write(0x03, 0x18);
420 SET_FARVAR(SEG_GRAPH, *addr_far, color);
421 stdvga_grdc_write(0x08, 0xff);
422 stdvga_grdc_write(0x05, 0x00);
423 stdvga_grdc_write(0x03, 0x00);
426 if (GET_GLOBAL(vmode_g->depth) == 2)
427 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
429 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
432 data = GET_FARVAR(SEG_CTEXT, *addr_far);
433 if (GET_GLOBAL(vmode_g->depth) == 2) {
434 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
435 mask = 0x03 << ((3 - (x & 0x03)) * 2);
437 attr = (color & 0x01) << (7 - (x & 0x07));
438 mask = 0x01 << (7 - (x & 0x07));
446 SET_FARVAR(SEG_CTEXT, *addr_far, data);
450 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
451 SET_FARVAR(SEG_GRAPH, *addr_far, color);
459 vgafb_read_pixel(u16 x, u16 y)
462 struct vgamode_s *vmode_g = vgahw_find_mode(GET_BDA(video_mode));
466 u8 *addr_far, mask, attr=0, data, i;
467 switch (GET_GLOBAL(vmode_g->memmodel)) {
469 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
470 mask = 0x80 >> (x & 0x07);
472 for (i = 0; i < 4; i++) {
473 stdvga_grdc_write(0x04, i);
474 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
480 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
483 data = GET_FARVAR(SEG_CTEXT, *addr_far);
484 if (GET_GLOBAL(vmode_g->depth) == 2)
485 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
487 attr = (data >> (7 - (x & 0x07))) & 0x01;
491 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
492 attr = GET_FARVAR(SEG_GRAPH, *addr_far);