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 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 stdvga_grdc_write(0x05, 0x01);
61 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols, stride
62 , (rows - nblines) * cheight);
66 stdvga_grdc_write(0x05, 0x02);
67 memset_stride(SEG_GRAPH, dest_far, attr, cols, stride, nblines * cheight);
68 stdvga_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) / 2;
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);
94 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols
95 , stride, (rows - nblines) * cheight);
99 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols
100 , stride, nblines * cheight);
101 memset_stride(SEG_CTEXT, dest_far, attr, cols
102 , stride, nblines * cheight);
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 /****************************************************************
163 * Read/write characters to screen
164 ****************************************************************/
167 write_gfx_char_pl4(struct vgamode_s *vmode_g
168 , struct cursorpos cp, struct carattr ca)
170 u16 nbcols = GET_BDA(video_cols);
174 u8 cheight = GET_GLOBAL(vmode_g->cheight);
186 u16 addr = cp.x + cp.y * cheight * nbcols;
187 u16 src = ca.car * cheight;
188 stdvga_sequ_write(0x02, 0x0f);
189 stdvga_grdc_write(0x05, 0x02);
191 stdvga_grdc_write(0x03, 0x18);
193 stdvga_grdc_write(0x03, 0x00);
195 for (i = 0; i < cheight; i++) {
196 u8 *dest_far = (void*)(addr + i * nbcols);
198 for (j = 0; j < 8; j++) {
200 stdvga_grdc_write(0x08, mask);
201 GET_FARVAR(SEG_GRAPH, *(volatile u8*)dest_far);
202 if (GET_GLOBAL(fdata_g[src + i]) & mask)
203 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
205 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
208 stdvga_grdc_write(0x08, 0xff);
209 stdvga_grdc_write(0x05, 0x00);
210 stdvga_grdc_write(0x03, 0x00);
214 write_gfx_char_cga(struct vgamode_s *vmode_g
215 , struct cursorpos cp, struct carattr ca)
217 u16 nbcols = GET_BDA(video_cols);
221 u8 *fdata_g = vgafont8;
222 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
223 u16 addr = (cp.x * bpp) + cp.y * 320;
224 u16 src = ca.car * 8;
226 for (i = 0; i < 8; i++) {
227 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
234 data = GET_FARVAR(SEG_CTEXT, *dest_far);
236 for (j = 0; j < 8; j++) {
237 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
239 data ^= (ca.attr & 0x01) << (7 - j);
241 data |= (ca.attr & 0x01) << (7 - j);
245 SET_FARVAR(SEG_CTEXT, *dest_far, data);
250 data = GET_FARVAR(SEG_CTEXT, *dest_far);
252 for (j = 0; j < 4; j++) {
253 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
255 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
257 data |= (ca.attr & 0x03) << ((3 - j) * 2);
261 SET_FARVAR(SEG_CTEXT, *dest_far, data);
269 write_gfx_char_lin(struct vgamode_s *vmode_g
270 , struct cursorpos cp, struct carattr ca)
272 // Get the dimensions
273 u16 nbcols = GET_BDA(video_cols);
277 u8 *fdata_g = vgafont8;
278 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
279 u16 src = ca.car * 8;
281 for (i = 0; i < 8; i++) {
282 u8 *dest_far = (void*)(addr + i * nbcols * 8);
285 for (j = 0; j < 8; j++) {
287 if (GET_GLOBAL(fdata_g[src + i]) & mask)
289 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
296 write_text_char(struct vgamode_s *vmode_g
297 , struct cursorpos cp, struct carattr ca)
299 // Get the dimensions
300 u16 nbrows = GET_BDA(video_rows) + 1;
301 u16 nbcols = GET_BDA(video_cols);
303 // Compute the address
304 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
305 + (cp.x + cp.y * nbcols) * 2);
308 u16 dummy = (ca.attr << 8) | ca.car;
309 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
311 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
316 vgafb_write_char(struct cursorpos cp, struct carattr ca)
319 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
323 // FIXME gfx mode not complete
324 switch (GET_GLOBAL(vmode_g->memmodel)) {
327 write_text_char(vmode_g, cp, ca);
331 write_gfx_char_pl4(vmode_g, cp, ca);
334 write_gfx_char_cga(vmode_g, cp, ca);
337 write_gfx_char_lin(vmode_g, cp, ca);
343 vgafb_read_char(struct cursorpos cp)
346 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
350 if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
352 dprintf(1, "Read char in graphics mode\n");
356 // Get the dimensions
357 u16 nbrows = GET_BDA(video_rows) + 1;
358 u16 nbcols = GET_BDA(video_cols);
360 // Compute the address
361 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
362 + (cp.x + cp.y * nbcols) * 2);
363 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
364 struct carattr ca = {v, v>>8, 0};
368 struct carattr ca2 = {0, 0, 0};
373 /****************************************************************
375 ****************************************************************/
378 vgafb_write_pixel(u8 color, u16 x, u16 y)
381 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
384 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
387 u8 *addr_far, mask, attr, data;
388 switch (GET_GLOBAL(vmode_g->memmodel)) {
391 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
392 mask = 0x80 >> (x & 0x07);
393 stdvga_grdc_write(0x08, mask);
394 stdvga_grdc_write(0x05, 0x02);
395 GET_FARVAR(SEG_GRAPH, *(volatile u8*)addr_far);
397 stdvga_grdc_write(0x03, 0x18);
398 SET_FARVAR(SEG_GRAPH, *addr_far, color);
399 stdvga_grdc_write(0x08, 0xff);
400 stdvga_grdc_write(0x05, 0x00);
401 stdvga_grdc_write(0x03, 0x00);
404 if (GET_GLOBAL(vmode_g->pixbits) == 2)
405 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
407 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
410 data = GET_FARVAR(SEG_CTEXT, *addr_far);
411 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
412 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
413 mask = 0x03 << ((3 - (x & 0x03)) * 2);
415 attr = (color & 0x01) << (7 - (x & 0x07));
416 mask = 0x01 << (7 - (x & 0x07));
424 SET_FARVAR(SEG_CTEXT, *addr_far, data);
427 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
428 SET_FARVAR(SEG_GRAPH, *addr_far, color);
434 vgafb_read_pixel(u16 x, u16 y)
437 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
440 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
443 u8 *addr_far, mask, attr=0, data, i;
444 switch (GET_GLOBAL(vmode_g->memmodel)) {
447 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
448 mask = 0x80 >> (x & 0x07);
450 for (i = 0; i < 4; i++) {
451 stdvga_grdc_write(0x04, i);
452 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
458 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
461 data = GET_FARVAR(SEG_CTEXT, *addr_far);
462 if (GET_GLOBAL(vmode_g->pixbits) == 2)
463 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
465 attr = (data >> (7 - (x & 0x07))) & 0x01;
468 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
469 attr = GET_FARVAR(SEG_GRAPH, *addr_far);