| [e16e8f2] | 1 | /* ----------------------------------------------------------------------- * |
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| 2 | * |
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| 3 | * Copyright 1999-2008 H. Peter Anvin - All Rights Reserved |
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| 4 | * Copyright 2009 Intel Corporation; author: H. Peter Anvin |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person |
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| 7 | * obtaining a copy of this software and associated documentation |
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| 8 | * files (the "Software"), to deal in the Software without |
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| 9 | * restriction, including without limitation the rights to use, |
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| 10 | * copy, modify, merge, publish, distribute, sublicense, and/or |
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| 11 | * sell copies of the Software, and to permit persons to whom |
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| 12 | * the Software is furnished to do so, subject to the following |
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| 13 | * conditions: |
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| 14 | * |
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| 15 | * The above copyright notice and this permission notice shall |
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| 16 | * be included in all copies or substantial portions of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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| 19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
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| 20 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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| 21 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
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| 22 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
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| 23 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 24 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 25 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 26 | * |
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| 27 | * ----------------------------------------------------------------------- */ |
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| 28 | |
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| 29 | /* |
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| 30 | * initvesa.c |
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| 31 | * |
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| 32 | * Query the VESA BIOS and select a 640x480x32 mode with local mapping |
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| 33 | * support, if one exists. |
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| 34 | */ |
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| 35 | |
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| 36 | #include <inttypes.h> |
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| 37 | #include <com32.h> |
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| 38 | #include <stdlib.h> |
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| 39 | #include <string.h> |
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| 40 | #include <limits.h> |
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| 41 | #include <graphics.h> |
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| 42 | |
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| 43 | #include "vesa.h" |
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| 44 | #include "mboot.h" |
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| 45 | |
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| 46 | struct vesa_info vesa_info; |
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| 47 | |
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| 48 | void set_graphics_mode(const struct multiboot_header *mbh, |
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| 49 | struct multiboot_info *mbi) |
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| 50 | { |
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| 51 | com32sys_t rm; |
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| 52 | uint16_t mode, bestmode, *mode_ptr; |
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| 53 | struct vesa_general_info *gi; |
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| 54 | struct vesa_mode_info *mi; |
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| 55 | int pxf, bestpxf; |
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| 56 | int wantx, wanty; |
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| 57 | int err, besterr; |
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| 58 | bool better; |
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| 59 | addr_t viaddr; |
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| 60 | |
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| 61 | /* Only do this if requested by the OS image */ |
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| 62 | if (!(mbh->flags & MULTIBOOT_VIDEO_MODE) || mbh->mode_type != 0) |
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| 63 | return; |
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| 64 | |
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| 65 | gi = lmalloc(sizeof *gi); |
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| 66 | if (!gi) |
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| 67 | return; |
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| 68 | |
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| 69 | mi = lmalloc(sizeof *mi); |
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| 70 | if (!mi) |
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| 71 | goto out; |
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| 72 | |
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| 73 | memset(&rm, 0, sizeof rm); |
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| 74 | memset(gi, 0, sizeof *gi); |
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| 75 | |
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| 76 | gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */ |
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| 77 | rm.eax.w[0] = 0x4F00; /* Get SVGA general information */ |
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| 78 | rm.edi.w[0] = OFFS(gi); |
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| 79 | rm.es = SEG(gi); |
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| 80 | __intcall(0x10, &rm, &rm); |
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| 81 | |
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| 82 | if (rm.eax.w[0] != 0x004F) |
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| 83 | goto out; /* Function call failed */ |
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| 84 | if (gi->signature != VESA_MAGIC) |
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| 85 | goto out; /* No magic */ |
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| 86 | if (gi->version < 0x0102) |
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| 87 | goto out; /* VESA 1.2+ required */ |
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| 88 | |
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| 89 | memcpy(&vesa_info.gi, gi, sizeof *gi); |
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| 90 | |
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| 91 | /* Search for a suitable mode with a suitable color and memory model... */ |
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| 92 | |
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| 93 | mode_ptr = GET_PTR(gi->video_mode_ptr); |
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| 94 | bestmode = 0; |
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| 95 | bestpxf = 0; |
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| 96 | wantx = mbh->width ? mbh->width : 0xffff; |
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| 97 | wanty = mbh->height ? mbh->height : 0xffff; |
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| 98 | besterr = wantx + wanty; |
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| 99 | |
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| 100 | while ((mode = *mode_ptr++) != 0xFFFF) { |
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| 101 | mode &= 0x1FF; /* The rest are attributes of sorts */ |
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| 102 | |
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| 103 | memset(&rm, 0, sizeof rm); |
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| 104 | memset(mi, 0, sizeof *mi); |
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| 105 | rm.eax.w[0] = 0x4F01; /* Get SVGA mode information */ |
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| 106 | rm.ecx.w[0] = mode; |
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| 107 | rm.edi.w[0] = OFFS(mi); |
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| 108 | rm.es = SEG(mi); |
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| 109 | __intcall(0x10, &rm, &rm); |
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| 110 | |
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| 111 | /* Must be a supported mode */ |
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| 112 | if (rm.eax.w[0] != 0x004f) |
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| 113 | continue; |
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| 114 | |
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| 115 | /* Must be an LFB color graphics mode supported by the hardware. |
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| 116 | |
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| 117 | The bits tested are: |
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| 118 | 7 - linear frame buffer |
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| 119 | 4 - graphics mode |
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| 120 | 3 - color mode |
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| 121 | 1 - mode information available (mandatory in VBE 1.2+) |
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| 122 | 0 - mode supported by hardware |
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| 123 | */ |
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| 124 | if ((mi->mode_attr & 0x009b) != 0x009b) |
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| 125 | continue; |
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| 126 | |
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| 127 | /* We don't support multibank (interlaced memory) modes */ |
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| 128 | /* |
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| 129 | * Note: The Bochs VESA BIOS (vbe.c 1.58 2006/08/19) violates the |
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| 130 | * specification which states that banks == 1 for unbanked modes; |
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| 131 | * fortunately it does report bank_size == 0 for those. |
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| 132 | */ |
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| 133 | if (mi->banks > 1 && mi->bank_size) |
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| 134 | continue; |
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| 135 | |
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| 136 | /* Must either be a packed-pixel mode or a direct color mode |
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| 137 | (depending on VESA version ); must be a supported pixel format */ |
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| 138 | |
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| 139 | if (mi->bpp == 32 && |
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| 140 | (mi->memory_layout == 4 || |
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| 141 | (mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 && |
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| 142 | mi->bpos == 0))) |
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| 143 | pxf = 32; |
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| 144 | else if (mi->bpp == 24 && |
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| 145 | (mi->memory_layout == 4 || |
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| 146 | (mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 && |
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| 147 | mi->bpos == 0))) |
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| 148 | pxf = 24; |
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| 149 | else if (mi->bpp == 16 && |
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| 150 | (mi->memory_layout == 4 || |
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| 151 | (mi->memory_layout == 6 && mi->rpos == 11 && mi->gpos == 5 && |
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| 152 | mi->bpos == 0))) |
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| 153 | pxf = 16; |
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| 154 | else if (mi->bpp == 15 && |
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| 155 | (mi->memory_layout == 4 || |
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| 156 | (mi->memory_layout == 6 && mi->rpos == 10 && mi->gpos == 5 && |
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| 157 | mi->bpos == 0))) |
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| 158 | pxf = 15; |
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| 159 | else |
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| 160 | continue; |
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| 161 | |
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| 162 | better = false; |
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| 163 | err = abs(mi->h_res - wantx) + abs(mi->v_res - wanty); |
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| 164 | |
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| 165 | #define IS_GOOD(mi, bestx, besty) \ |
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| 166 | ((mi)->h_res >= (bestx) && (mi)->v_res >= (besty)) |
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| 167 | |
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| 168 | if (!bestpxf) |
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| 169 | better = true; |
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| 170 | else if (!IS_GOOD(&vesa_info.mi, wantx, wanty) && |
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| 171 | IS_GOOD(mi, wantx, wanty)) |
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| 172 | /* This matches criteria, which the previous one didn't */ |
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| 173 | better = true; |
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| 174 | else if (IS_GOOD(&vesa_info.mi, wantx, wanty) && |
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| 175 | !IS_GOOD(mi, wantx, wanty)) |
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| 176 | /* This doesn't match criteria, and the previous one did */ |
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| 177 | better = false; |
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| 178 | else if (err < besterr) |
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| 179 | better = true; |
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| 180 | else if (err == besterr && (pxf == (int)mbh->depth || pxf > bestpxf)) |
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| 181 | better = true; |
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| 182 | |
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| 183 | if (better) { |
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| 184 | bestmode = mode; |
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| 185 | bestpxf = pxf; |
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| 186 | memcpy(&vesa_info.mi, mi, sizeof *mi); |
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| 187 | } |
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| 188 | } |
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| 189 | |
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| 190 | if (!bestpxf) |
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| 191 | goto out; /* No mode found */ |
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| 192 | |
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| 193 | mi = &vesa_info.mi; |
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| 194 | mode = bestmode; |
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| 195 | |
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| 196 | /* Now set video mode */ |
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| 197 | memset(&rm, 0, sizeof rm); |
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| 198 | rm.eax.w[0] = 0x4F02; /* Set SVGA video mode */ |
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| 199 | mode |= 0x4000; /* Request linear framebuffer */ |
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| 200 | rm.ebx.w[0] = mode; |
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| 201 | __intcall(0x10, &rm, &rm); |
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| 202 | if (rm.eax.w[0] != 0x004F) |
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| 203 | goto out; /* Failed to set mode */ |
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| 204 | |
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| 205 | mbi->flags |= MB_INFO_VIDEO_INFO; |
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| 206 | mbi->vbe_mode = mode; |
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| 207 | viaddr = map_data(&vesa_info, sizeof vesa_info, 4, 0); |
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| 208 | mbi->vbe_control_info = viaddr + offsetof(struct vesa_info, gi); |
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| 209 | mbi->vbe_mode_info = viaddr + offsetof(struct vesa_info, mi); |
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| 210 | |
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| 211 | /* Get the VBE 2.x PM entry point if supported */ |
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| 212 | rm.eax.w[0] = 0x4F0A; |
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| 213 | rm.ebx.w[0] = 0; |
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| 214 | __intcall(0x10, &rm, &rm); |
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| 215 | if (rm.eax.w[0] == 0x004F) { |
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| 216 | mbi->vbe_interface_seg = rm.es; |
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| 217 | mbi->vbe_interface_off = rm.edi.w[0]; |
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| 218 | mbi->vbe_interface_len = rm.ecx.w[0]; |
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| 219 | } |
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| 220 | |
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| 221 | /* In theory this should be: |
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| 222 | * |
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| 223 | * UsingVga = (mi->mode_attr & 4) ? 0x0007 : 0x000f; |
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| 224 | * |
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| 225 | * However, that would assume all systems that claim to handle text |
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| 226 | * output in VESA modes actually do that... |
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| 227 | */ |
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| 228 | graphics_using_vga(0x0F, vesa_info.mi.h_res, vesa_info.mi.v_res); |
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| 229 | |
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| 230 | out: |
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| 231 | lfree(mi); |
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| 232 | lfree(gi); |
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| 233 | } |
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