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 "vgabios.h" // vgafb_scroll
9 #include "biosvar.h" // GET_BDA
10 #include "util.h" // memset_far
11 #include "stdvga.h" // stdvga_planar4_plane
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;
60 int cols = lr.x - ul.x + 1;
61 int rows = lr.y - ul.y + 1;
64 stdvga_planar4_plane(i);
65 void *dest = dest_far;
67 dest = memcpy_stride(SEG_GRAPH, dest, src_far, cols * cwidth
68 , stride, (rows - nblines) * cheight);
69 u8 pixels = (attr & (1<<i)) ? 0xff : 0x00;
70 memset_stride(SEG_GRAPH, dest, pixels, cols * cwidth
71 , stride, nblines * cheight);
73 stdvga_planar4_plane(-1);
77 scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
78 , struct cursorpos ul, struct cursorpos lr)
80 int cheight = GET_GLOBAL(vmode_g->cheight) / 2;
81 int cwidth = GET_GLOBAL(vmode_g->depth);
82 int stride = GET_BDA(video_cols) * cwidth;
83 void *src_far, *dest_far;
85 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
86 src_far = dest_far + nblines * cheight * stride;
90 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
91 src_far = dest_far - nblines * cheight * stride;
97 attr = (attr&1) | ((attr&1)<<1);
99 attr |= (attr<<2) | (attr<<4) | (attr<<6);
100 int cols = lr.x - ul.x + 1;
101 int rows = lr.y - ul.y + 1;
102 if (nblines < rows) {
103 memcpy_stride(SEG_CTEXT, dest_far+0x2000, src_far+0x2000, cols * cwidth
104 , stride, (rows - nblines) * cheight);
105 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols * cwidth
106 , stride, (rows - nblines) * cheight);
108 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols * cwidth
109 , stride, nblines * cheight);
110 memset_stride(SEG_CTEXT, dest_far, attr, cols * cwidth
111 , stride, nblines * cheight);
115 scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr
116 , struct cursorpos ul, struct cursorpos lr)
120 int stride = GET_BDA(video_cols) * cwidth;
121 void *src_far, *dest_far;
123 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
124 src_far = dest_far + nblines * cheight * stride;
128 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
129 src_far = dest_far - nblines * cheight * stride;
134 int cols = lr.x - ul.x + 1;
135 int rows = lr.y - ul.y + 1;
137 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
138 , stride, (rows - nblines) * cheight);
139 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
140 , stride, nblines * cheight);
144 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
145 , struct cursorpos ul, struct cursorpos lr)
149 int stride = GET_BDA(video_cols) * cwidth;
150 void *src_far, *dest_far = (void*)(GET_BDA(video_pagesize) * ul.page);
152 dest_far += ul.y * cheight * stride + ul.x * cwidth;
153 src_far = dest_far + nblines * cheight * stride;
157 dest_far += lr.y * cheight * stride + ul.x * cwidth;
158 src_far = dest_far - nblines * cheight * stride;
163 attr = (attr << 8) | ' ';
164 int cols = lr.x - ul.x + 1;
165 int rows = lr.y - ul.y + 1;
166 u16 seg = GET_GLOBAL(vmode_g->sstart);
168 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
169 , stride, (rows - nblines) * cheight);
170 memset16_stride(seg, dest_far, attr, cols * cwidth
171 , stride, nblines * cheight);
175 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
178 struct vgamode_s *vmode_g = get_current_mode();
182 // FIXME gfx mode not complete
183 switch (GET_GLOBAL(vmode_g->memmodel)) {
185 scroll_text(vmode_g, nblines, attr, ul, lr);
188 scroll_pl4(vmode_g, nblines, attr, ul, lr);
191 scroll_cga(vmode_g, nblines, attr, ul, lr);
195 scroll_lin(vmode_g, nblines, attr, ul, lr);
201 /****************************************************************
202 * Read/write characters to screen
203 ****************************************************************/
206 write_gfx_char_pl4(struct vgamode_s *vmode_g
207 , struct cursorpos cp, struct carattr ca)
209 u16 nbcols = GET_BDA(video_cols);
213 u8 cheight = GET_GLOBAL(vmode_g->cheight);
225 u16 addr = cp.x + cp.y * cheight * nbcols;
226 u16 src = ca.car * cheight;
228 for (i=0; i<4; i++) {
229 stdvga_planar4_plane(i);
230 u8 colors = ((ca.attr & (1<<i)) ? 0xff : 0x00);
232 for (j = 0; j < cheight; j++) {
233 u8 *dest_far = (void*)(addr + j * nbcols);
234 u8 pixels = colors & GET_GLOBAL(fdata_g[src + j]);
236 pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far);
237 SET_FARVAR(SEG_GRAPH, *dest_far, pixels);
240 stdvga_planar4_plane(-1);
244 write_gfx_char_cga(struct vgamode_s *vmode_g
245 , struct cursorpos cp, struct carattr ca)
247 u16 nbcols = GET_BDA(video_cols);
251 u8 *fdata_g = vgafont8;
252 u8 bpp = GET_GLOBAL(vmode_g->depth);
253 u16 addr = (cp.x * bpp) + cp.y * 320;
254 u16 src = ca.car * 8;
256 for (i = 0; i < 8; i++) {
257 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
261 u8 colors = (ca.attr & 0x01) ? 0xff : 0x00;
262 u8 pixels = colors & GET_GLOBAL(fdata_g[src + i]);
264 pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far);
265 SET_FARVAR(SEG_CTEXT, *dest_far, pixels);
268 u8 fontline = GET_GLOBAL(fdata_g[src + i]);
270 for (j = 0; j < 8; j++)
271 if (fontline & (1<<j))
272 pixels |= (ca.attr & 0x03) << (j*2);
273 pixels = htons(pixels);
275 pixels ^= GET_FARVAR(SEG_GRAPH, *(u16*)dest_far);
276 SET_FARVAR(SEG_CTEXT, *(u16*)dest_far, pixels);
282 write_gfx_char_lin(struct vgamode_s *vmode_g
283 , struct cursorpos cp, struct carattr ca)
285 // Get the dimensions
286 u16 nbcols = GET_BDA(video_cols);
290 u8 *fdata_g = vgafont8;
291 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
292 u16 src = ca.car * 8;
294 for (i = 0; i < 8; i++) {
295 u8 *dest_far = (void*)(addr + i * nbcols * 8);
296 u8 fontline = GET_GLOBAL(fdata_g[src + i]);
298 for (j = 0; j < 8; j++) {
299 u8 pixel = (fontline & (0x80>>j)) ? ca.attr : 0x00;
300 SET_FARVAR(SEG_GRAPH, dest_far[j], pixel);
306 write_text_char(struct vgamode_s *vmode_g
307 , struct cursorpos cp, struct carattr ca)
309 // Compute the address
310 u16 nbcols = GET_BDA(video_cols);
311 void *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
312 + (cp.x + cp.y * nbcols) * 2);
315 u16 dummy = (ca.attr << 8) | ca.car;
316 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
318 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
323 vgafb_write_char(struct cursorpos cp, struct carattr ca)
326 struct vgamode_s *vmode_g = get_current_mode();
330 // FIXME gfx mode not complete
331 switch (GET_GLOBAL(vmode_g->memmodel)) {
333 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);
343 write_gfx_char_lin(vmode_g, cp, ca);
349 vgafb_read_char(struct cursorpos cp)
352 struct vgamode_s *vmode_g = get_current_mode();
356 if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) {
358 dprintf(1, "Read char in graphics mode\n");
362 // Compute the address
363 u16 nbcols = GET_BDA(video_cols);
364 u16 *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
365 + (cp.x + cp.y * nbcols) * 2);
366 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
367 struct carattr ca = {v, v>>8, 0};
371 struct carattr ca2 = {0, 0, 0};
376 /****************************************************************
378 ****************************************************************/
381 vgafb_write_pixel(u8 color, u16 x, u16 y)
384 struct vgamode_s *vmode_g = get_current_mode();
388 u8 *addr_far, mask, attr, data, i;
389 switch (GET_GLOBAL(vmode_g->memmodel)) {
391 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
392 mask = 0x80 >> (x & 0x07);
393 for (i=0; i<4; i++) {
394 stdvga_planar4_plane(i);
395 u8 colors = (color & (1<<i)) ? 0xff : 0x00;
396 u8 orig = GET_FARVAR(SEG_GRAPH, *addr_far);
399 SET_FARVAR(SEG_GRAPH, *addr_far, (colors & mask) | (orig & ~mask));
401 stdvga_planar4_plane(-1);
404 if (GET_GLOBAL(vmode_g->depth) == 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->depth) == 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);
428 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
429 SET_FARVAR(SEG_GRAPH, *addr_far, color);
437 vgafb_read_pixel(u16 x, u16 y)
440 struct vgamode_s *vmode_g = get_current_mode();
444 u8 *addr_far, mask, attr=0, data, i;
445 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_planar4_plane(i);
452 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
456 stdvga_planar4_plane(-1);
459 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
462 data = GET_FARVAR(SEG_CTEXT, *addr_far);
463 if (GET_GLOBAL(vmode_g->depth) == 2)
464 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
466 attr = (data >> (7 - (x & 0x07))) & 0x01;
470 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
471 attr = GET_FARVAR(SEG_GRAPH, *addr_far);