bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Block driver for Conectix/Microsoft Virtual PC images |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 4 | * Copyright (c) 2005 Alex Beregszaszi |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 24 | #include "qemu-common.h" |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 25 | #include "block_int.h" |
| 26 | |
| 27 | /**************************************************************/ |
| 28 | |
| 29 | #define HEADER_SIZE 512 |
| 30 | |
| 31 | //#define CACHE |
| 32 | |
| 33 | // always big-endian |
| 34 | struct vpc_subheader { |
| 35 | char magic[8]; // "conectix" / "cxsparse" |
| 36 | union { |
| 37 | struct { |
| 38 | uint32_t unk1[2]; |
| 39 | uint32_t unk2; // always zero? |
| 40 | uint32_t subheader_offset; |
| 41 | uint32_t unk3; // some size? |
| 42 | char creator[4]; // "vpc " |
| 43 | uint16_t major; |
| 44 | uint16_t minor; |
| 45 | char guest[4]; // "Wi2k" |
| 46 | uint32_t unk4[7]; |
| 47 | uint8_t vnet_id[16]; // virtual network id, purpose unknown |
| 48 | // next 16 longs are used, but dunno the purpose |
| 49 | // next 6 longs unknown, following 7 long maybe a serial |
| 50 | char padding[HEADER_SIZE - 84]; |
| 51 | } main; |
| 52 | struct { |
| 53 | uint32_t unk1[2]; // all bits set |
| 54 | uint32_t unk2; // always zero? |
| 55 | uint32_t pagetable_offset; |
| 56 | uint32_t unk3; |
| 57 | uint32_t pagetable_entries; // 32bit/entry |
| 58 | uint32_t pageentry_size; // 512*8*512 |
| 59 | uint32_t nb_sectors; |
| 60 | char padding[HEADER_SIZE - 40]; |
| 61 | } sparse; |
| 62 | char padding[HEADER_SIZE - 8]; |
| 63 | } type; |
| 64 | }; |
| 65 | |
| 66 | typedef struct BDRVVPCState { |
| 67 | int fd; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 68 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 69 | int pagetable_entries; |
| 70 | uint32_t *pagetable; |
| 71 | |
| 72 | uint32_t pageentry_size; |
| 73 | #ifdef CACHE |
| 74 | uint8_t *pageentry_u8; |
| 75 | uint32_t *pageentry_u32; |
| 76 | uint16_t *pageentry_u16; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 77 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 78 | uint64_t last_bitmap; |
| 79 | #endif |
| 80 | } BDRVVPCState; |
| 81 | |
| 82 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 83 | { |
ths | ffe8ab8 | 2007-12-16 03:16:05 +0000 | [diff] [blame] | 84 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 85 | return 100; |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 86 | return 0; |
| 87 | } |
| 88 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 89 | static int vpc_open(BlockDriverState *bs, const char *filename, int flags) |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 90 | { |
| 91 | BDRVVPCState *s = bs->opaque; |
| 92 | int fd, i; |
| 93 | struct vpc_subheader header; |
| 94 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 95 | fd = open(filename, O_RDONLY | O_BINARY); |
| 96 | if (fd < 0) |
| 97 | return -1; |
| 98 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 99 | bs->read_only = 1; // no write support yet |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 100 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 101 | s->fd = fd; |
| 102 | |
| 103 | if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE) |
| 104 | goto fail; |
| 105 | |
| 106 | if (strncmp(header.magic, "conectix", 8)) |
| 107 | goto fail; |
| 108 | lseek(s->fd, be32_to_cpu(header.type.main.subheader_offset), SEEK_SET); |
| 109 | |
| 110 | if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE) |
| 111 | goto fail; |
| 112 | |
| 113 | if (strncmp(header.magic, "cxsparse", 8)) |
| 114 | goto fail; |
| 115 | |
| 116 | bs->total_sectors = ((uint64_t)be32_to_cpu(header.type.sparse.pagetable_entries) * |
| 117 | be32_to_cpu(header.type.sparse.pageentry_size)) / 512; |
| 118 | |
| 119 | lseek(s->fd, be32_to_cpu(header.type.sparse.pagetable_offset), SEEK_SET); |
| 120 | |
| 121 | s->pagetable_entries = be32_to_cpu(header.type.sparse.pagetable_entries); |
| 122 | s->pagetable = qemu_malloc(s->pagetable_entries * 4); |
| 123 | if (!s->pagetable) |
| 124 | goto fail; |
| 125 | if (read(s->fd, s->pagetable, s->pagetable_entries * 4) != |
| 126 | s->pagetable_entries * 4) |
| 127 | goto fail; |
| 128 | for (i = 0; i < s->pagetable_entries; i++) |
| 129 | be32_to_cpus(&s->pagetable[i]); |
| 130 | |
| 131 | s->pageentry_size = be32_to_cpu(header.type.sparse.pageentry_size); |
| 132 | #ifdef CACHE |
| 133 | s->pageentry_u8 = qemu_malloc(512); |
| 134 | if (!s->pageentry_u8) |
| 135 | goto fail; |
| 136 | s->pageentry_u32 = s->pageentry_u8; |
| 137 | s->pageentry_u16 = s->pageentry_u8; |
| 138 | s->last_pagetable = -1; |
| 139 | #endif |
| 140 | |
| 141 | return 0; |
| 142 | fail: |
| 143 | close(fd); |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) |
| 148 | { |
| 149 | BDRVVPCState *s = bs->opaque; |
| 150 | uint64_t offset = sector_num * 512; |
| 151 | uint64_t bitmap_offset, block_offset; |
| 152 | uint32_t pagetable_index, pageentry_index; |
| 153 | |
| 154 | pagetable_index = offset / s->pageentry_size; |
| 155 | pageentry_index = (offset % s->pageentry_size) / 512; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 156 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 157 | if (pagetable_index > s->pagetable_entries || s->pagetable[pagetable_index] == 0xffffffff) |
| 158 | return -1; // not allocated |
| 159 | |
| 160 | bitmap_offset = 512 * s->pagetable[pagetable_index]; |
| 161 | block_offset = bitmap_offset + 512 + (512 * pageentry_index); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 162 | |
bellard | 26a7646 | 2006-06-25 18:15:32 +0000 | [diff] [blame] | 163 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 164 | // sector_num, pagetable_index, pageentry_index, |
| 165 | // bitmap_offset, block_offset); |
| 166 | |
| 167 | // disabled by reason |
| 168 | #if 0 |
| 169 | #ifdef CACHE |
| 170 | if (bitmap_offset != s->last_bitmap) |
| 171 | { |
| 172 | lseek(s->fd, bitmap_offset, SEEK_SET); |
| 173 | |
| 174 | s->last_bitmap = bitmap_offset; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 175 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 176 | // Scary! Bitmap is stored as big endian 32bit entries, |
| 177 | // while we used to look it up byte by byte |
| 178 | read(s->fd, s->pageentry_u8, 512); |
| 179 | for (i = 0; i < 128; i++) |
| 180 | be32_to_cpus(&s->pageentry_u32[i]); |
| 181 | } |
| 182 | |
| 183 | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) |
| 184 | return -1; |
| 185 | #else |
| 186 | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 187 | |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 188 | read(s->fd, &bitmap_entry, 1); |
| 189 | |
| 190 | if ((bitmap_entry >> (pageentry_index % 8)) & 1) |
| 191 | return -1; // not allocated |
| 192 | #endif |
| 193 | #endif |
| 194 | lseek(s->fd, block_offset, SEEK_SET); |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 199 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
bellard | 6a0f9e8 | 2005-04-27 20:17:58 +0000 | [diff] [blame] | 200 | uint8_t *buf, int nb_sectors) |
| 201 | { |
| 202 | BDRVVPCState *s = bs->opaque; |
| 203 | int ret; |
| 204 | |
| 205 | while (nb_sectors > 0) { |
| 206 | if (!seek_to_sector(bs, sector_num)) |
| 207 | { |
| 208 | ret = read(s->fd, buf, 512); |
| 209 | if (ret != 512) |
| 210 | return -1; |
| 211 | } |
| 212 | else |
| 213 | memset(buf, 0, 512); |
| 214 | nb_sectors--; |
| 215 | sector_num++; |
| 216 | buf += 512; |
| 217 | } |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static void vpc_close(BlockDriverState *bs) |
| 222 | { |
| 223 | BDRVVPCState *s = bs->opaque; |
| 224 | qemu_free(s->pagetable); |
| 225 | #ifdef CACHE |
| 226 | qemu_free(s->pageentry_u8); |
| 227 | #endif |
| 228 | close(s->fd); |
| 229 | } |
| 230 | |
| 231 | BlockDriver bdrv_vpc = { |
| 232 | "vpc", |
| 233 | sizeof(BDRVVPCState), |
| 234 | vpc_probe, |
| 235 | vpc_open, |
| 236 | vpc_read, |
| 237 | NULL, |
| 238 | vpc_close, |
| 239 | }; |