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;
96 int cols = lr.x - ul.x + 1;
97 int rows = lr.y - ul.y + 1;
99 memcpy_stride(SEG_CTEXT, dest_far+0x2000, src_far+0x2000, cols * cwidth
100 , stride, (rows - nblines) * cheight);
101 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols * cwidth
102 , stride, (rows - nblines) * cheight);
104 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols * cwidth
105 , stride, nblines * cheight);
106 memset_stride(SEG_CTEXT, dest_far, attr, cols * cwidth
107 , stride, nblines * cheight);
111 scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr
112 , struct cursorpos ul, struct cursorpos lr)
116 int stride = GET_BDA(video_cols) * cwidth;
117 void *src_far, *dest_far;
119 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
120 src_far = dest_far + nblines * cheight * stride;
124 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
125 src_far = dest_far - nblines * cheight * stride;
130 int cols = lr.x - ul.x + 1;
131 int rows = lr.y - ul.y + 1;
133 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
134 , stride, (rows - nblines) * cheight);
135 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
136 , stride, nblines * cheight);
140 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
141 , struct cursorpos ul, struct cursorpos lr)
145 int stride = GET_BDA(video_cols) * cwidth;
146 void *src_far, *dest_far = (void*)(GET_BDA(video_pagesize) * ul.page);
148 dest_far += ul.y * cheight * stride + ul.x * cwidth;
149 src_far = dest_far + nblines * cheight * stride;
153 dest_far += lr.y * cheight * stride + ul.x * cwidth;
154 src_far = dest_far - nblines * cheight * stride;
159 attr = (attr << 8) | ' ';
160 int cols = lr.x - ul.x + 1;
161 int rows = lr.y - ul.y + 1;
162 u16 seg = GET_GLOBAL(vmode_g->sstart);
164 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
165 , stride, (rows - nblines) * cheight);
166 memset16_stride(seg, dest_far, attr, cols * cwidth
167 , stride, nblines * cheight);
171 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
174 struct vgamode_s *vmode_g = get_current_mode();
178 // FIXME gfx mode not complete
179 switch (GET_GLOBAL(vmode_g->memmodel)) {
181 scroll_text(vmode_g, nblines, attr, ul, lr);
184 scroll_pl4(vmode_g, nblines, attr, ul, lr);
187 scroll_cga(vmode_g, nblines, attr, ul, lr);
191 scroll_lin(vmode_g, nblines, attr, ul, lr);
197 /****************************************************************
198 * Read/write characters to screen
199 ****************************************************************/
202 write_gfx_char_pl4(struct vgamode_s *vmode_g
203 , struct cursorpos cp, struct carattr ca)
205 u16 nbcols = GET_BDA(video_cols);
209 u8 cheight = GET_GLOBAL(vmode_g->cheight);
221 u16 addr = cp.x + cp.y * cheight * nbcols;
222 u16 src = ca.car * cheight;
224 for (i=0; i<4; i++) {
225 stdvga_planar4_plane(i);
226 u8 colors = ((ca.attr & (1<<i)) ? 0xff : 0x00);
228 for (j = 0; j < cheight; j++) {
229 u8 *dest_far = (void*)(addr + j * nbcols);
230 u8 pixels = colors & GET_GLOBAL(fdata_g[src + j]);
232 pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far);
233 SET_FARVAR(SEG_GRAPH, *dest_far, pixels);
236 stdvga_planar4_plane(-1);
240 write_gfx_char_cga(struct vgamode_s *vmode_g
241 , struct cursorpos cp, struct carattr ca)
243 u16 nbcols = GET_BDA(video_cols);
247 u8 *fdata_g = vgafont8;
248 u8 bpp = GET_GLOBAL(vmode_g->depth);
249 u16 addr = (cp.x * bpp) + cp.y * 320;
250 u16 src = ca.car * 8;
252 for (i = 0; i < 8; i++) {
253 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
257 u8 colors = (ca.attr & 0x01) ? 0xff : 0x00;
258 u8 pixels = colors & GET_GLOBAL(fdata_g[src + i]);
260 pixels ^= GET_FARVAR(SEG_GRAPH, *dest_far);
261 SET_FARVAR(SEG_CTEXT, *dest_far, pixels);
264 u8 fontline = GET_GLOBAL(fdata_g[src + i]);
266 for (j = 0; j < 8; j++)
267 if (fontline & (1<<j))
268 pixels |= (ca.attr & 0x03) << (j*2);
269 pixels = htons(pixels);
271 pixels ^= GET_FARVAR(SEG_GRAPH, *(u16*)dest_far);
272 SET_FARVAR(SEG_CTEXT, *(u16*)dest_far, pixels);
278 write_gfx_char_lin(struct vgamode_s *vmode_g
279 , struct cursorpos cp, struct carattr ca)
281 // Get the dimensions
282 u16 nbcols = GET_BDA(video_cols);
286 u8 *fdata_g = vgafont8;
287 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
288 u16 src = ca.car * 8;
290 for (i = 0; i < 8; i++) {
291 u8 *dest_far = (void*)(addr + i * nbcols * 8);
292 u8 fontline = GET_GLOBAL(fdata_g[src + i]);
294 for (j = 0; j < 8; j++) {
295 u8 pixel = (fontline & (0x80>>j)) ? ca.attr : 0x00;
296 SET_FARVAR(SEG_GRAPH, dest_far[j], pixel);
302 write_text_char(struct vgamode_s *vmode_g
303 , struct cursorpos cp, struct carattr ca)
305 // Compute the address
306 u16 nbcols = GET_BDA(video_cols);
307 void *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
308 + (cp.x + cp.y * nbcols) * 2);
311 u16 dummy = (ca.attr << 8) | ca.car;
312 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
314 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
319 vgafb_write_char(struct cursorpos cp, struct carattr ca)
322 struct vgamode_s *vmode_g = get_current_mode();
326 // FIXME gfx mode not complete
327 switch (GET_GLOBAL(vmode_g->memmodel)) {
329 write_text_char(vmode_g, cp, ca);
332 write_gfx_char_pl4(vmode_g, cp, ca);
335 write_gfx_char_cga(vmode_g, cp, ca);
339 write_gfx_char_lin(vmode_g, cp, ca);
345 vgafb_read_char(struct cursorpos cp)
348 struct vgamode_s *vmode_g = get_current_mode();
352 if (GET_GLOBAL(vmode_g->memmodel) != MM_TEXT) {
354 dprintf(1, "Read char in graphics mode\n");
358 // Compute the address
359 u16 nbcols = GET_BDA(video_cols);
360 u16 *address_far = (void*)(GET_BDA(video_pagesize) * cp.page
361 + (cp.x + cp.y * nbcols) * 2);
362 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
363 struct carattr ca = {v, v>>8, 0};
367 struct carattr ca2 = {0, 0, 0};
372 /****************************************************************
374 ****************************************************************/
377 vgafb_write_pixel(u8 color, u16 x, u16 y)
380 struct vgamode_s *vmode_g = get_current_mode();
384 u8 *addr_far, mask, attr, data, i;
385 switch (GET_GLOBAL(vmode_g->memmodel)) {
387 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
388 mask = 0x80 >> (x & 0x07);
389 for (i=0; i<4; i++) {
390 stdvga_planar4_plane(i);
391 u8 colors = (color & (1<<i)) ? 0xff : 0x00;
392 u8 orig = GET_FARVAR(SEG_GRAPH, *addr_far);
395 SET_FARVAR(SEG_GRAPH, *addr_far, (colors & mask) | (orig & ~mask));
397 stdvga_planar4_plane(-1);
400 if (GET_GLOBAL(vmode_g->depth) == 2)
401 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
403 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
406 data = GET_FARVAR(SEG_CTEXT, *addr_far);
407 if (GET_GLOBAL(vmode_g->depth) == 2) {
408 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
409 mask = 0x03 << ((3 - (x & 0x03)) * 2);
411 attr = (color & 0x01) << (7 - (x & 0x07));
412 mask = 0x01 << (7 - (x & 0x07));
420 SET_FARVAR(SEG_CTEXT, *addr_far, data);
424 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
425 SET_FARVAR(SEG_GRAPH, *addr_far, color);
433 vgafb_read_pixel(u16 x, u16 y)
436 struct vgamode_s *vmode_g = get_current_mode();
440 u8 *addr_far, mask, attr=0, data, i;
441 switch (GET_GLOBAL(vmode_g->memmodel)) {
443 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
444 mask = 0x80 >> (x & 0x07);
446 for (i = 0; i < 4; i++) {
447 stdvga_planar4_plane(i);
448 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
452 stdvga_planar4_plane(-1);
455 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
458 data = GET_FARVAR(SEG_CTEXT, *addr_far);
459 if (GET_GLOBAL(vmode_g->depth) == 2)
460 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
462 attr = (data >> (7 - (x & 0x07))) & 0x01;
466 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
467 attr = GET_FARVAR(SEG_GRAPH, *addr_far);