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->pixbits);
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_text(struct vgamode_s *vmode_g, int nblines, int attr
109 , struct cursorpos ul, struct cursorpos lr)
113 u16 nbrows = GET_BDA(video_rows) + 1;
114 u16 nbcols = GET_BDA(video_cols);
115 int stride = nbcols * cwidth;
116 void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
118 dest_far += ul.y * cheight * stride + ul.x * cwidth;
119 src_far = dest_far + nblines * cheight * stride;
123 dest_far += lr.y * cheight * stride + ul.x * cwidth;
124 src_far = dest_far - nblines * cheight * stride;
127 int cols = lr.x - ul.x + 1;
128 int rows = lr.y - ul.y + 1;
129 u16 seg = GET_GLOBAL(vmode_g->sstart);
131 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
132 , stride, (rows - nblines) * cheight);
135 attr = (attr << 8) | ' ';
136 memset16_stride(seg, dest_far, attr, cols * cwidth
137 , stride, nblines * cheight);
141 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
144 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
148 // FIXME gfx mode not complete
149 switch (GET_GLOBAL(vmode_g->memmodel)) {
152 scroll_text(vmode_g, nblines, attr, ul, lr);
156 scroll_pl4(vmode_g, nblines, attr, ul, lr);
159 scroll_cga(vmode_g, nblines, attr, ul, lr);
162 dprintf(1, "Scroll in graphics mode\n");
167 /****************************************************************
168 * Read/write characters to screen
169 ****************************************************************/
172 write_gfx_char_pl4(struct vgamode_s *vmode_g
173 , struct cursorpos cp, struct carattr ca)
175 u16 nbcols = GET_BDA(video_cols);
179 u8 cheight = GET_GLOBAL(vmode_g->cheight);
191 u16 addr = cp.x + cp.y * cheight * nbcols;
192 u16 src = ca.car * cheight;
193 stdvga_sequ_write(0x02, 0x0f);
194 stdvga_grdc_write(0x05, 0x02);
196 stdvga_grdc_write(0x03, 0x18);
198 stdvga_grdc_write(0x03, 0x00);
200 for (i = 0; i < cheight; i++) {
201 u8 *dest_far = (void*)(addr + i * nbcols);
203 for (j = 0; j < 8; j++) {
205 stdvga_grdc_write(0x08, mask);
206 GET_FARVAR(SEG_GRAPH, *(volatile u8*)dest_far);
207 if (GET_GLOBAL(fdata_g[src + i]) & mask)
208 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
210 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
213 stdvga_grdc_write(0x08, 0xff);
214 stdvga_grdc_write(0x05, 0x00);
215 stdvga_grdc_write(0x03, 0x00);
219 write_gfx_char_cga(struct vgamode_s *vmode_g
220 , struct cursorpos cp, struct carattr ca)
222 u16 nbcols = GET_BDA(video_cols);
226 u8 *fdata_g = vgafont8;
227 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
228 u16 addr = (cp.x * bpp) + cp.y * 320;
229 u16 src = ca.car * 8;
231 for (i = 0; i < 8; i++) {
232 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
239 data = GET_FARVAR(SEG_CTEXT, *dest_far);
241 for (j = 0; j < 8; j++) {
242 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
244 data ^= (ca.attr & 0x01) << (7 - j);
246 data |= (ca.attr & 0x01) << (7 - j);
250 SET_FARVAR(SEG_CTEXT, *dest_far, data);
255 data = GET_FARVAR(SEG_CTEXT, *dest_far);
257 for (j = 0; j < 4; j++) {
258 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
260 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
262 data |= (ca.attr & 0x03) << ((3 - j) * 2);
266 SET_FARVAR(SEG_CTEXT, *dest_far, data);
274 write_gfx_char_lin(struct vgamode_s *vmode_g
275 , struct cursorpos cp, struct carattr ca)
277 // Get the dimensions
278 u16 nbcols = GET_BDA(video_cols);
282 u8 *fdata_g = vgafont8;
283 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
284 u16 src = ca.car * 8;
286 for (i = 0; i < 8; i++) {
287 u8 *dest_far = (void*)(addr + i * nbcols * 8);
290 for (j = 0; j < 8; j++) {
292 if (GET_GLOBAL(fdata_g[src + i]) & mask)
294 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
301 write_text_char(struct vgamode_s *vmode_g
302 , struct cursorpos cp, struct carattr ca)
304 // Get the dimensions
305 u16 nbrows = GET_BDA(video_rows) + 1;
306 u16 nbcols = GET_BDA(video_cols);
308 // Compute the address
309 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
310 + (cp.x + cp.y * nbcols) * 2);
313 u16 dummy = (ca.attr << 8) | ca.car;
314 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
316 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
321 vgafb_write_char(struct cursorpos cp, struct carattr ca)
324 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
328 // FIXME gfx mode not complete
329 switch (GET_GLOBAL(vmode_g->memmodel)) {
332 write_text_char(vmode_g, cp, ca);
336 write_gfx_char_pl4(vmode_g, cp, ca);
339 write_gfx_char_cga(vmode_g, cp, ca);
342 write_gfx_char_lin(vmode_g, cp, ca);
348 vgafb_read_char(struct cursorpos cp)
351 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
355 if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
357 dprintf(1, "Read char in graphics mode\n");
361 // Get the dimensions
362 u16 nbrows = GET_BDA(video_rows) + 1;
363 u16 nbcols = GET_BDA(video_cols);
365 // Compute the address
366 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
367 + (cp.x + cp.y * nbcols) * 2);
368 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
369 struct carattr ca = {v, v>>8, 0};
373 struct carattr ca2 = {0, 0, 0};
378 /****************************************************************
380 ****************************************************************/
383 vgafb_write_pixel(u8 color, u16 x, u16 y)
386 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
389 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
392 u8 *addr_far, mask, attr, data;
393 switch (GET_GLOBAL(vmode_g->memmodel)) {
396 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
397 mask = 0x80 >> (x & 0x07);
398 stdvga_grdc_write(0x08, mask);
399 stdvga_grdc_write(0x05, 0x02);
400 GET_FARVAR(SEG_GRAPH, *(volatile u8*)addr_far);
402 stdvga_grdc_write(0x03, 0x18);
403 SET_FARVAR(SEG_GRAPH, *addr_far, color);
404 stdvga_grdc_write(0x08, 0xff);
405 stdvga_grdc_write(0x05, 0x00);
406 stdvga_grdc_write(0x03, 0x00);
409 if (GET_GLOBAL(vmode_g->pixbits) == 2)
410 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
412 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
415 data = GET_FARVAR(SEG_CTEXT, *addr_far);
416 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
417 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
418 mask = 0x03 << ((3 - (x & 0x03)) * 2);
420 attr = (color & 0x01) << (7 - (x & 0x07));
421 mask = 0x01 << (7 - (x & 0x07));
429 SET_FARVAR(SEG_CTEXT, *addr_far, data);
432 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
433 SET_FARVAR(SEG_GRAPH, *addr_far, color);
439 vgafb_read_pixel(u16 x, u16 y)
442 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
445 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
448 u8 *addr_far, mask, attr=0, data, i;
449 switch (GET_GLOBAL(vmode_g->memmodel)) {
452 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
453 mask = 0x80 >> (x & 0x07);
455 for (i = 0; i < 4; i++) {
456 stdvga_grdc_write(0x04, i);
457 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
463 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
466 data = GET_FARVAR(SEG_CTEXT, *addr_far);
467 if (GET_GLOBAL(vmode_g->pixbits) == 2)
468 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
470 attr = (data >> (7 - (x & 0x07))) & 0x01;
473 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
474 attr = GET_FARVAR(SEG_GRAPH, *addr_far);