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nuclear@7
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1 #include <stdio.h>
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nuclear@7
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2 #include <string.h>
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3 #include "vbe.h"
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4 #include "dpmi.h"
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5
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6 /* VGA DAC registers used for palette setting in 8bpp modes */
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nuclear@7
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7 #define VGA_DAC_STATE 0x3c7
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nuclear@7
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8 #define VGA_DAC_ADDR_RD 0x3c7
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9 #define VGA_DAC_ADDR_WR 0x3c8
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10 #define VGA_DAC_DATA 0x3c9
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11
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12 #define MODE_LFB (1 << 14)
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13
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14
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15 struct vbe_info *vbe_get_info(void)
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16 {
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17 static unsigned short info_block_seg;
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18 static struct vbe_info *info;
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19 struct dpmi_real_regs regs;
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20
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21 if(!info) {
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22 /* allocate 32 paragraphs (512 bytes) */
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23 info_block_seg = dpmi_alloc(32);
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24 info = (struct vbe_info*)(info_block_seg << 4);
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25 }
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26
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27 memcpy(info->sig, "VBE2", 4);
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28
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29 memset(®s, 0, sizeof regs);
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30 regs.es = info_block_seg;
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31 regs.eax = 0x4f00;
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32
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33 dpmi_real_int(0x10, ®s);
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34
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35 return info;
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36 }
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37
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38 struct vbe_mode_info *vbe_get_mode_info(int mode)
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39 {
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40 static unsigned short mode_info_seg;
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41 static struct vbe_mode_info *mi;
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42 struct dpmi_real_regs regs;
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43
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44 if(!mi) {
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45 /* allocate 16 paragraphs (256 bytes) */
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46 mode_info_seg = dpmi_alloc(16);
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47 mi = (struct vbe_mode_info*)(mode_info_seg << 4);
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48 }
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49
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50 memset(®s, 0, sizeof regs);
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51 regs.es = mode_info_seg;
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52 regs.eax = 0x4f01;
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53 regs.ecx = mode;
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54 regs.es = mode_info_seg;
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55
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56 dpmi_real_int(0x10, ®s);
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57 if(regs.eax & 0xff00) {
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58 return 0;
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59 }
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60
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61 return mi;
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62 }
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63
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64 int vbe_set_mode(int mode)
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65 {
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66 struct dpmi_real_regs regs;
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67
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68 memset(®s, 0, sizeof regs);
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69 regs.eax = 0x4f02;
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70 regs.ebx = mode;
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71 dpmi_real_int(0x10, ®s);
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72
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73 if(regs.eax == 0x100) {
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74 return -1;
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75 }
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76 return 0;
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77 }
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78
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79 int vbe_set_palette_bits(int bits)
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80 {
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81 struct dpmi_real_regs regs;
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82
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83 memset(®s, 0, sizeof regs);
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84 regs.eax = 0x4f08;
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85 regs.ebx = bits << 8; /* bits in bh */
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86 dpmi_real_int(0x10, ®s);
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87
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88 if((regs.eax >> 8) & 0xff == 3) {
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89 return -1;
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90 }
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91 return regs.ebx >> 8 & 0xff; /* new color bits in bh */
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92 }
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93
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94 /* TODO: implement palette setting through the VBE2 interface for
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95 * non-VGA displays (actually don't).
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96 */
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97 void vbe_set_palette(int idx, int *col, int count, int bits)
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98 {
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99 int i, shift = 8 - bits;
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100
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101 __asm {
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102 mov dx, VGA_DAC_ADDR_WR
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103 mov eax, idx
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104 out dx, al
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105 }
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106
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107 for(i=0; i<count; i++) {
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108 unsigned char r = *col++;
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109 unsigned char g = *col++;
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110 unsigned char b = *col++;
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111
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112 if(shift) {
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113 r >>= shift;
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114 g >>= shift;
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115 b >>= shift;
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116 }
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117
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118 __asm {
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119 mov dx, VGA_DAC_DATA
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120 mov al, r
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121 out dx, al
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122 mov al, g
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123 out dx, al
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124 mov al, b
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125 out dx, al
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126 }
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127 }
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128 }
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129
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130 static unsigned int get_mask(int sz, int pos)
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131 {
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132 unsigned int i, mask = 0;
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133
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134 for(i=0; i<sz; i++) {
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135 mask |= 1 << i;
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136 }
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137 return mask << pos;
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138 }
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139
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140 void print_mode_info(FILE *fp, struct vbe_mode_info *mi)
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141 {
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142 fprintf(fp, "resolution: %dx%d\n", mi->xres, mi->yres);
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143 fprintf(fp, "color depth: %d\n", mi->bpp);
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144 fprintf(fp, "mode attributes: %x\n", mi->mode_attr);
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145 fprintf(fp, "bytes per scanline: %d\n", mi->scanline_bytes);
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146 fprintf(fp, "number of planes: %d\n", (int)mi->num_planes);
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147 fprintf(fp, "number of banks: %d\n", (int)mi->num_banks);
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148 fprintf(fp, "mem model: %d\n", (int)mi->mem_model);
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149 fprintf(fp, "red bits: %d (mask: %x)\n", (int)mi->rmask_size, get_mask(mi->rmask_size, mi->rpos));
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150 fprintf(fp, "green bits: %d (mask: %x)\n", (int)mi->gmask_size, get_mask(mi->gmask_size, mi->gpos));
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151 fprintf(fp, "blue bits: %d (mask: %x)\n", (int)mi->bmask_size, get_mask(mi->bmask_size, mi->bpos));
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152 fprintf(fp, "framebuffer address: %x\n", mi->fb_addr);
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153 }
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