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1 /* ----------------------------------------------------------------------- *
2  *
3  *   Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
4  *
5  *   Permission is hereby granted, free of charge, to any person
6  *   obtaining a copy of this software and associated documentation
7  *   files (the "Software"), to deal in the Software without
8  *   restriction, including without limitation the rights to use,
9  *   copy, modify, merge, publish, distribute, sublicense, and/or
10  *   sell copies of the Software, and to permit persons to whom
11  *   the Software is furnished to do so, subject to the following
12  *   conditions:
13  *
14  *   The above copyright notice and this permission notice shall
15  *   be included in all copies or substantial portions of the Software.
16  *
17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24  *   OTHER DEALINGS IN THE SOFTWARE.
25  *
26  * ----------------------------------------------------------------------- */
27 
28 /*
29  * initvesa.c
30  *
31  * Query the VESA BIOS and select a 640x480x32 mode with local mapping
32  * support, if one exists.
33  */
34 
35 #include <inttypes.h>
36 #include <com32.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <sys/fpu.h>
40 #include <syslinux/video.h>
41 #include "vesa.h"
42 #include "video.h"
43 #include "fill.h"
44 #include "debug.h"
45 
46 struct vesa_info __vesa_info;
47 
48 struct vesa_char *__vesacon_text_display;
49 
50 int __vesacon_font_height;
51 int __vesacon_text_rows;
52 int __vesacon_text_cols;
53 enum vesa_pixel_format __vesacon_pixel_format = PXF_NONE;
54 unsigned int __vesacon_bytes_per_pixel;
55 uint8_t __vesacon_graphics_font[FONT_MAX_CHARS][FONT_MAX_HEIGHT];
56 
57 uint32_t *__vesacon_background, *__vesacon_shadowfb;
58 
unpack_font(uint8_t * dst,uint8_t * src,int height)59 static void unpack_font(uint8_t * dst, uint8_t * src, int height)
60 {
61     int i;
62 
63     for (i = 0; i < FONT_MAX_CHARS; i++) {
64 	memcpy(dst, src, height);
65 	memset(dst + height, 0, FONT_MAX_HEIGHT - height);
66 
67 	dst += FONT_MAX_HEIGHT;
68 	src += height;
69     }
70 }
71 
vesacon_set_mode(int * x,int * y)72 static int vesacon_set_mode(int *x, int *y)
73 {
74     uint8_t *rom_font;
75     struct vesa_mode_info *mi;
76     enum vesa_pixel_format bestpxf;
77     int rv;
78 
79     debug("Hello, World!\r\n");
80 
81     /* Free any existing data structures */
82     if (__vesacon_background) {
83 	free(__vesacon_background);
84 	__vesacon_background = NULL;
85     }
86     if (__vesacon_shadowfb) {
87 	free(__vesacon_shadowfb);
88 	__vesacon_shadowfb = NULL;
89     }
90 
91     rv = firmware->vesa->set_mode(&__vesa_info, x, y, &bestpxf);
92     if (rv)
93 	return rv;
94 
95     mi = &__vesa_info.mi;
96     __vesacon_bytes_per_pixel = (mi->bpp + 7) >> 3;
97     __vesacon_format_pixels = __vesacon_format_pixels_list[bestpxf];
98 
99     /* Download the SYSLINUX- or firmware-provided font */
100     __vesacon_font_height = syslinux_font_query(&rom_font);
101     if (!__vesacon_font_height)
102 	__vesacon_font_height = firmware->vesa->font_query(&rom_font);
103 
104     unpack_font((uint8_t *) __vesacon_graphics_font, rom_font,
105 		__vesacon_font_height);
106 
107     __vesacon_background = calloc(mi->h_res*mi->v_res, 4);
108     __vesacon_shadowfb = calloc(mi->h_res*mi->v_res, 4);
109 
110     __vesacon_init_copy_to_screen();
111 
112     /* Tell syslinux we changed video mode */
113     /* In theory this should be:
114 
115        flags = (mi->mode_attr & 4) ? 0x0007 : 0x000f;
116 
117        However, that would assume all systems that claim to handle text
118        output in VESA modes actually do that... */
119     syslinux_report_video_mode(0x000f, mi->h_res, mi->v_res);
120 
121     __vesacon_pixel_format = bestpxf;
122 
123     return 0;
124 }
125 
126 /* FIXME:
127  * Does init_text_display need an EFI counterpart?
128  * e.g. vesa_char may need to setup UNICODE char for EFI
129  * and the number of screen chars may need to be sized up
130  * accordingly. This may also require turning byte strings
131  * into unicode strings in the framebuffer
132  * Possibly, revisit vesacon_fill() for EFI.
133  */
init_text_display(void)134 static int init_text_display(void)
135 {
136     size_t nchars;
137     struct vesa_char *ptr;
138     struct vesa_char def_char = {
139 	.ch = ' ',
140 	.attr = 0,
141     };
142 
143     if (__vesacon_text_display)
144 	free(__vesacon_text_display);
145 
146     __vesacon_text_cols = TEXT_PIXEL_COLS / FONT_WIDTH;
147     __vesacon_text_rows = TEXT_PIXEL_ROWS / __vesacon_font_height;
148     nchars = (__vesacon_text_cols+2) * (__vesacon_text_rows+2);
149 
150     __vesacon_text_display = ptr = malloc(nchars * sizeof(struct vesa_char));
151 
152     if (!ptr)
153 	return -1;
154 
155     vesacon_fill(ptr, def_char, nchars);
156     __vesacon_init_cursor(__vesacon_font_height);
157 
158     return 0;
159 }
160 
161 /*
162  * On input, VESA initialization is passed a desirable resolution. On
163  * return, either the requested resolution is set or the system
164  * supported default resolution is set and returned to the caller.
165  */
__vesacon_init(int * x,int * y)166 int __vesacon_init(int *x, int *y)
167 {
168     int rv;
169 
170     /* We need the FPU for graphics, at least libpng et al will need it... */
171     if (x86_init_fpu())
172 	return 10;
173 
174     rv = vesacon_set_mode(x, y);
175     if (rv) {
176 	/* Try to see if we can just patch the BIOS... */
177 	if (__vesacon_i915resolution(*x, *y))
178 	    return rv;
179 	if (vesacon_set_mode(x, y))
180 	    return rv;
181     }
182 
183     init_text_display();
184 
185     debug("Mode set, now drawing at %#p\r\n", __vesa_info.mi.lfb_ptr);
186 
187     __vesacon_init_background();
188 
189     debug("Ready!\r\n");
190     return 0;
191 }
192