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" // 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 u16 nbrows = GET_BDA(video_rows) + 1;
143 u16 nbcols = GET_BDA(video_cols);
144 int stride = nbcols * cwidth;
145 void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
147 dest_far += ul.y * cheight * stride + ul.x * cwidth;
148 src_far = dest_far + nblines * cheight * stride;
152 dest_far += lr.y * cheight * stride + ul.x * cwidth;
153 src_far = dest_far - nblines * cheight * stride;
156 int cols = lr.x - ul.x + 1;
157 int rows = lr.y - ul.y + 1;
158 u16 seg = GET_GLOBAL(vmode_g->sstart);
160 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
161 , stride, (rows - nblines) * cheight);
164 attr = (attr << 8) | ' ';
165 memset16_stride(seg, dest_far, attr, cols * cwidth
166 , stride, nblines * cheight);
170 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
173 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
177 // FIXME gfx mode not complete
178 switch (GET_GLOBAL(vmode_g->memmodel)) {
180 scroll_text(vmode_g, nblines, attr, ul, lr);
183 scroll_pl4(vmode_g, nblines, attr, ul, lr);
186 scroll_cga(vmode_g, nblines, attr, ul, lr);
190 scroll_lin(vmode_g, nblines, attr, ul, lr);
196 /****************************************************************
197 * Read/write characters to screen
198 ****************************************************************/
201 write_gfx_char_pl4(struct vgamode_s *vmode_g
202 , struct cursorpos cp, struct carattr ca)
204 u16 nbcols = GET_BDA(video_cols);
208 u8 cheight = GET_GLOBAL(vmode_g->cheight);
220 u16 addr = cp.x + cp.y * cheight * nbcols;
221 u16 src = ca.car * cheight;
222 stdvga_sequ_write(0x02, 0x0f);
223 stdvga_grdc_write(0x05, 0x02);
225 stdvga_grdc_write(0x03, 0x18);
227 stdvga_grdc_write(0x03, 0x00);
229 for (i = 0; i < cheight; i++) {
230 u8 *dest_far = (void*)(addr + i * nbcols);
232 for (j = 0; j < 8; j++) {
234 stdvga_grdc_write(0x08, mask);
235 GET_FARVAR(SEG_GRAPH, *(volatile u8*)dest_far);
236 if (GET_GLOBAL(fdata_g[src + i]) & mask)
237 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
239 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
242 stdvga_grdc_write(0x08, 0xff);
243 stdvga_grdc_write(0x05, 0x00);
244 stdvga_grdc_write(0x03, 0x00);
248 write_gfx_char_cga(struct vgamode_s *vmode_g
249 , struct cursorpos cp, struct carattr ca)
251 u16 nbcols = GET_BDA(video_cols);
255 u8 *fdata_g = vgafont8;
256 u8 bpp = GET_GLOBAL(vmode_g->depth);
257 u16 addr = (cp.x * bpp) + cp.y * 320;
258 u16 src = ca.car * 8;
260 for (i = 0; i < 8; i++) {
261 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
268 data = GET_FARVAR(SEG_CTEXT, *dest_far);
270 for (j = 0; j < 8; j++) {
271 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
273 data ^= (ca.attr & 0x01) << (7 - j);
275 data |= (ca.attr & 0x01) << (7 - j);
279 SET_FARVAR(SEG_CTEXT, *dest_far, data);
284 data = GET_FARVAR(SEG_CTEXT, *dest_far);
286 for (j = 0; j < 4; j++) {
287 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
289 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
291 data |= (ca.attr & 0x03) << ((3 - j) * 2);
295 SET_FARVAR(SEG_CTEXT, *dest_far, data);
303 write_gfx_char_lin(struct vgamode_s *vmode_g
304 , struct cursorpos cp, struct carattr ca)
306 // Get the dimensions
307 u16 nbcols = GET_BDA(video_cols);
311 u8 *fdata_g = vgafont8;
312 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
313 u16 src = ca.car * 8;
315 for (i = 0; i < 8; i++) {
316 u8 *dest_far = (void*)(addr + i * nbcols * 8);
319 for (j = 0; j < 8; j++) {
321 if (GET_GLOBAL(fdata_g[src + i]) & mask)
323 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
330 write_text_char(struct vgamode_s *vmode_g
331 , struct cursorpos cp, struct carattr ca)
333 // Get the dimensions
334 u16 nbrows = GET_BDA(video_rows) + 1;
335 u16 nbcols = GET_BDA(video_cols);
337 // Compute the address
338 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
339 + (cp.x + cp.y * nbcols) * 2);
342 u16 dummy = (ca.attr << 8) | ca.car;
343 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
345 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
350 vgafb_write_char(struct cursorpos cp, struct carattr ca)
353 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
357 // FIXME gfx mode not complete
358 switch (GET_GLOBAL(vmode_g->memmodel)) {
360 write_text_char(vmode_g, cp, ca);
363 write_gfx_char_pl4(vmode_g, cp, ca);
366 write_gfx_char_cga(vmode_g, cp, ca);
370 write_gfx_char_lin(vmode_g, cp, ca);
376 vgafb_read_char(struct cursorpos cp)
379 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
383 if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) {
385 dprintf(1, "Read char in graphics mode\n");
389 // Get the dimensions
390 u16 nbrows = GET_BDA(video_rows) + 1;
391 u16 nbcols = GET_BDA(video_cols);
393 // Compute the address
394 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
395 + (cp.x + cp.y * nbcols) * 2);
396 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
397 struct carattr ca = {v, v>>8, 0};
401 struct carattr ca2 = {0, 0, 0};
406 /****************************************************************
408 ****************************************************************/
411 vgafb_write_pixel(u8 color, u16 x, u16 y)
414 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
418 u8 *addr_far, mask, attr, data;
419 switch (GET_GLOBAL(vmode_g->memmodel)) {
421 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
422 mask = 0x80 >> (x & 0x07);
423 stdvga_grdc_write(0x08, mask);
424 stdvga_grdc_write(0x05, 0x02);
425 GET_FARVAR(SEG_GRAPH, *(volatile u8*)addr_far);
427 stdvga_grdc_write(0x03, 0x18);
428 SET_FARVAR(SEG_GRAPH, *addr_far, color);
429 stdvga_grdc_write(0x08, 0xff);
430 stdvga_grdc_write(0x05, 0x00);
431 stdvga_grdc_write(0x03, 0x00);
434 if (GET_GLOBAL(vmode_g->depth) == 2)
435 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
437 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
440 data = GET_FARVAR(SEG_CTEXT, *addr_far);
441 if (GET_GLOBAL(vmode_g->depth) == 2) {
442 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
443 mask = 0x03 << ((3 - (x & 0x03)) * 2);
445 attr = (color & 0x01) << (7 - (x & 0x07));
446 mask = 0x01 << (7 - (x & 0x07));
454 SET_FARVAR(SEG_CTEXT, *addr_far, data);
458 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
459 SET_FARVAR(SEG_GRAPH, *addr_far, color);
467 vgafb_read_pixel(u16 x, u16 y)
470 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
474 u8 *addr_far, mask, attr=0, data, i;
475 switch (GET_GLOBAL(vmode_g->memmodel)) {
477 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
478 mask = 0x80 >> (x & 0x07);
480 for (i = 0; i < 4; i++) {
481 stdvga_grdc_write(0x04, i);
482 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
488 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
491 data = GET_FARVAR(SEG_CTEXT, *addr_far);
492 if (GET_GLOBAL(vmode_g->depth) == 2)
493 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
495 attr = (data >> (7 - (x & 0x07))) & 0x01;
499 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
500 attr = GET_FARVAR(SEG_GRAPH, *addr_far);