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 "vgatables.h" // find_vga_entry
13 // * extract hw code from framebuffer code
14 // * normalize params (don't use AX/BX/CX/etc.)
17 /****************************************************************
19 ****************************************************************/
22 memcpy_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines)
24 for (; lines; lines--, dst+=stride, src+=stride)
25 memcpy_far(seg, dst, seg, src, copylen);
30 memset_stride(u16 seg, void *dst, u8 val, int setlen, int stride, int lines)
32 for (; lines; lines--, dst+=stride)
33 memset_far(seg, dst, val, setlen);
37 memset16_stride(u16 seg, void *dst, u16 val, int setlen, int stride, int lines)
39 for (; lines; lines--, dst+=stride)
40 memset16_far(seg, dst, val, setlen);
44 scroll_pl4(struct vgamode_s *vmode_g, int nblines, int attr
45 , struct cursorpos ul, struct cursorpos lr)
47 struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
48 u8 cheight = GET_GLOBAL(vparam_g->cheight);
49 int stride = GET_BDA(video_cols);
50 void *src_far, *dest_far;
52 dest_far = (void*)(ul.y * cheight * stride + ul.x);
53 src_far = dest_far + nblines * cheight * stride;
57 dest_far = (void*)(lr.y * cheight * stride + ul.x);
58 src_far = dest_far - nblines * cheight * stride;
61 int cols = lr.x - ul.x + 1;
62 int rows = lr.y - ul.y + 1;
64 outw(0x0105, VGAREG_GRDC_ADDRESS);
65 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols, stride
66 , (rows - nblines) * cheight);
70 outw(0x0205, VGAREG_GRDC_ADDRESS);
71 memset_stride(SEG_GRAPH, dest_far, attr, cols, stride, nblines * cheight);
72 outw(0x0005, VGAREG_GRDC_ADDRESS);
76 scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
77 , struct cursorpos ul, struct cursorpos lr)
79 struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
80 u8 cheight = GET_GLOBAL(vparam_g->cheight);
81 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
82 int stride = GET_BDA(video_cols) * bpp;
83 void *src_far, *dest_far;
85 dest_far = (void*)(ul.y * cheight * stride + ul.x * bpp);
86 src_far = dest_far + nblines * cheight * stride;
90 dest_far = (void*)(lr.y * cheight * stride + ul.x * bpp);
91 src_far = dest_far - nblines * cheight * stride;
94 int cols = (lr.x - ul.x + 1) * bpp;
95 int rows = lr.y - ul.y + 1;
97 memcpy_stride(SEG_CTEXT, dest_far + 0x2000, src_far + 0x2000, cols
98 , stride, (rows - nblines) * cheight / 2);
99 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols
100 , stride, (rows - nblines) * cheight / 2);
104 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols
105 , stride, nblines * cheight / 2);
106 memset_stride(SEG_CTEXT, dest_far, attr, cols
107 , stride, nblines * cheight / 2);
111 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
112 , struct cursorpos ul, struct cursorpos lr)
114 u16 nbrows = GET_BDA(video_rows) + 1;
115 u16 nbcols = GET_BDA(video_cols);
116 void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
117 int stride = nbcols * 2;
119 dest_far += ul.y * stride + ul.x * 2;
120 src_far = dest_far + nblines * stride;
124 dest_far += lr.y * stride + ul.x * 2;
125 src_far = dest_far - nblines * stride;
128 int cols = (lr.x - ul.x + 1) * 2;
129 int rows = lr.y - ul.y + 1;
130 u16 seg = GET_GLOBAL(vmode_g->sstart);
132 dest_far = memcpy_stride(seg, dest_far, src_far, cols, stride
136 attr = (attr << 8) | ' ';
137 memset16_stride(seg, dest_far, attr, cols, stride, nblines);
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 clear_screen(struct vgamode_s *vmode_g)
169 switch (GET_GLOBAL(vmode_g->memmodel)) {
172 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0720, 32*1024);
175 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 32*1024);
178 outb(0x02, VGAREG_SEQU_ADDRESS);
179 u8 mmask = inb(VGAREG_SEQU_DATA);
180 outb(0x0f, VGAREG_SEQU_DATA); // all planes
181 memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 64*1024);
182 outb(mmask, VGAREG_SEQU_DATA);
188 /****************************************************************
189 * Read/write characters to screen
190 ****************************************************************/
193 write_gfx_char_pl4(struct vgamode_s *vmode_g
194 , struct cursorpos cp, struct carattr ca)
196 u16 nbcols = GET_BDA(video_cols);
200 struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
201 u8 cheight = GET_GLOBAL(vparam_g->cheight);
213 u16 addr = cp.x + cp.y * cheight * nbcols;
214 u16 src = ca.car * cheight;
215 outw(0x0f02, VGAREG_SEQU_ADDRESS);
216 outw(0x0205, VGAREG_GRDC_ADDRESS);
218 outw(0x1803, VGAREG_GRDC_ADDRESS);
220 outw(0x0003, VGAREG_GRDC_ADDRESS);
222 for (i = 0; i < cheight; i++) {
223 u8 *dest_far = (void*)(addr + i * nbcols);
225 for (j = 0; j < 8; j++) {
227 outw((mask << 8) | 0x08, VGAREG_GRDC_ADDRESS);
228 GET_FARVAR(SEG_GRAPH, *dest_far);
229 if (GET_GLOBAL(fdata_g[src + i]) & mask)
230 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
232 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
235 outw(0xff08, VGAREG_GRDC_ADDRESS);
236 outw(0x0005, VGAREG_GRDC_ADDRESS);
237 outw(0x0003, VGAREG_GRDC_ADDRESS);
241 write_gfx_char_cga(struct vgamode_s *vmode_g
242 , struct cursorpos cp, struct carattr ca)
244 u16 nbcols = GET_BDA(video_cols);
248 u8 *fdata_g = vgafont8;
249 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
250 u16 addr = (cp.x * bpp) + cp.y * 320;
251 u16 src = ca.car * 8;
253 for (i = 0; i < 8; i++) {
254 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
261 data = GET_FARVAR(SEG_CTEXT, *dest_far);
263 for (j = 0; j < 8; j++) {
264 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
266 data ^= (ca.attr & 0x01) << (7 - j);
268 data |= (ca.attr & 0x01) << (7 - j);
272 SET_FARVAR(SEG_CTEXT, *dest_far, data);
277 data = GET_FARVAR(SEG_CTEXT, *dest_far);
279 for (j = 0; j < 4; j++) {
280 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
282 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
284 data |= (ca.attr & 0x03) << ((3 - j) * 2);
288 SET_FARVAR(SEG_CTEXT, *dest_far, data);
296 write_gfx_char_lin(struct vgamode_s *vmode_g
297 , struct cursorpos cp, struct carattr ca)
299 // Get the dimensions
300 u16 nbcols = GET_BDA(video_cols);
304 u8 *fdata_g = vgafont8;
305 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
306 u16 src = ca.car * 8;
308 for (i = 0; i < 8; i++) {
309 u8 *dest_far = (void*)(addr + i * nbcols * 8);
312 for (j = 0; j < 8; j++) {
314 if (GET_GLOBAL(fdata_g[src + i]) & mask)
316 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
323 write_text_char(struct vgamode_s *vmode_g
324 , struct cursorpos cp, struct carattr ca)
326 // Get the dimensions
327 u16 nbrows = GET_BDA(video_rows) + 1;
328 u16 nbcols = GET_BDA(video_cols);
330 // Compute the address
331 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
332 + (cp.x + cp.y * nbcols) * 2);
335 u16 dummy = (ca.attr << 8) | ca.car;
336 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
338 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
343 vgafb_write_char(struct cursorpos cp, struct carattr ca)
346 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
350 // FIXME gfx mode not complete
351 switch (GET_GLOBAL(vmode_g->memmodel)) {
354 write_text_char(vmode_g, cp, ca);
358 write_gfx_char_pl4(vmode_g, cp, ca);
361 write_gfx_char_cga(vmode_g, cp, ca);
364 write_gfx_char_lin(vmode_g, cp, ca);
370 vgafb_read_char(struct cursorpos cp)
373 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
377 if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
379 dprintf(1, "Read char in graphics mode\n");
383 // Get the dimensions
384 u16 nbrows = GET_BDA(video_rows) + 1;
385 u16 nbcols = GET_BDA(video_cols);
387 // Compute the address
388 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
389 + (cp.x + cp.y * nbcols) * 2);
390 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
391 struct carattr ca = {v, v>>8, 0};
395 struct carattr ca2 = {0, 0, 0};
400 /****************************************************************
402 ****************************************************************/
405 biosfn_write_pixel(u8 BH, u8 AL, u16 CX, u16 DX)
408 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
411 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
414 u8 *addr_far, mask, attr, data;
415 switch (GET_GLOBAL(vmode_g->memmodel)) {
418 addr_far = (void*)(CX / 8 + DX * GET_BDA(video_cols));
419 mask = 0x80 >> (CX & 0x07);
420 outw((mask << 8) | 0x08, VGAREG_GRDC_ADDRESS);
421 outw(0x0205, VGAREG_GRDC_ADDRESS);
422 data = GET_FARVAR(SEG_GRAPH, *addr_far);
424 outw(0x1803, VGAREG_GRDC_ADDRESS);
425 SET_FARVAR(SEG_GRAPH, *addr_far, AL);
426 outw(0xff08, VGAREG_GRDC_ADDRESS);
427 outw(0x0005, VGAREG_GRDC_ADDRESS);
428 outw(0x0003, VGAREG_GRDC_ADDRESS);
431 if (GET_GLOBAL(vmode_g->pixbits) == 2)
432 addr_far = (void*)((CX >> 2) + (DX >> 1) * 80);
434 addr_far = (void*)((CX >> 3) + (DX >> 1) * 80);
437 data = GET_FARVAR(SEG_CTEXT, *addr_far);
438 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
439 attr = (AL & 0x03) << ((3 - (CX & 0x03)) * 2);
440 mask = 0x03 << ((3 - (CX & 0x03)) * 2);
442 attr = (AL & 0x01) << (7 - (CX & 0x07));
443 mask = 0x01 << (7 - (CX & 0x07));
451 SET_FARVAR(SEG_CTEXT, *addr_far, data);
454 addr_far = (void*)(CX + DX * (GET_BDA(video_cols) * 8));
455 SET_FARVAR(SEG_GRAPH, *addr_far, AL);
461 biosfn_read_pixel(u8 BH, u16 CX, u16 DX, u16 *AX)
464 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
467 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
470 u8 *addr_far, mask, attr=0, data, i;
471 switch (GET_GLOBAL(vmode_g->memmodel)) {
474 addr_far = (void*)(CX / 8 + DX * GET_BDA(video_cols));
475 mask = 0x80 >> (CX & 0x07);
477 for (i = 0; i < 4; i++) {
478 outw((i << 8) | 0x04, VGAREG_GRDC_ADDRESS);
479 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
485 addr_far = (void*)((CX >> 2) + (DX >> 1) * 80);
488 data = GET_FARVAR(SEG_CTEXT, *addr_far);
489 if (GET_GLOBAL(vmode_g->pixbits) == 2)
490 attr = (data >> ((3 - (CX & 0x03)) * 2)) & 0x03;
492 attr = (data >> (7 - (CX & 0x07))) & 0x01;
495 addr_far = (void*)(CX + DX * (GET_BDA(video_cols) * 8));
496 attr = GET_FARVAR(SEG_GRAPH, *addr_far);
499 *AX = (*AX & 0xff00) | attr;
503 /****************************************************************
505 ****************************************************************/
508 vgafb_load_font(u16 seg, void *src_far, u16 count
509 , u16 start, u8 destflags, u8 fontsize)
512 u16 blockaddr = ((destflags & 0x03) << 14) + ((destflags & 0x04) << 11);
513 void *dest_far = (void*)(blockaddr + start*32);
515 for (i = 0; i < count; i++)
516 memcpy_far(SEG_GRAPH, dest_far + i*32
517 , seg, src_far + i*fontsize, fontsize);
518 release_font_access();