15d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/* 2cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner * Block driver for Connectix / Microsoft Virtual PC images 35d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 45d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Copyright (c) 2005 Alex Beregszaszi 55d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> 65d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 75d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Permission is hereby granted, free of charge, to any person obtaining a copy 85d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * of this software and associated documentation files (the "Software"), to deal 95d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * in the Software without restriction, including without limitation the rights 105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * copies of the Software, and to permit persons to whom the Software is 125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * furnished to do so, subject to the following conditions: 135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * The above copyright notice and this permission notice shall be included in 155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * all copies or substantial portions of the Software. 165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 175d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 185d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 195d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 205d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 215d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 225d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * THE SOFTWARE. 245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner */ 255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#include "qemu-common.h" 265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#include "block_int.h" 275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#include "module.h" 285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/**************************************************************/ 305d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#define HEADER_SIZE 512 325d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner//#define CACHE 345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerenum vhd_type { 365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner VHD_FIXED = 2, 375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner VHD_DYNAMIC = 3, 385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner VHD_DIFFERENCING = 4, 395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner}; 405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// Seconds since Jan 1, 2000 0:00:00 (UTC) 425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#define VHD_TIMESTAMP_BASE 946684800 435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// always big-endian 455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstruct vhd_footer { 465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner char creator[8]; // "conectix" 475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t features; 485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t version; 495d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 505d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Offset of next header structure, 0xFFFFFFFF if none 515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t data_offset; 525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 535d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Seconds since Jan 1, 2000 0:00:00 (UTC) 545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t timestamp; 555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 565d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner char creator_app[4]; // "vpc " 575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint16_t major; 585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint16_t minor; 595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner char creator_os[4]; // "Wi2k" 605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 615d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t orig_size; 625d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t size; 635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 645d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint16_t cyls; 655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t heads; 665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t secs_per_cyl; 675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t type; 695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Checksum of the Hard Disk Footer ("one's complement of the sum of all 715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // the bytes in the footer without the checksum field") 725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t checksum; 735d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // UUID used to identify a parent hard disk (backing file) 755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t uuid[16]; 765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t in_saved_state; 785d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner}; 795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstruct vhd_dyndisk_header { 815d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner char magic[8]; // "cxsparse" 825d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 835d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Offset of next header structure, 0xFFFFFFFF if none 845d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t data_offset; 855d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 865d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Offset of the Block Allocation Table (BAT) 875d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t table_offset; 885d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t version; 905d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t max_table_entries; // 32bit/entry 915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 925d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // 2 MB by default, must be a power of two 935d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t block_size; 945d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t checksum; 965d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t parent_uuid[16]; 975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t parent_timestamp; 985d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t reserved; 995d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1005d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Backing file name (in UTF-16) 1015d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t parent_name[512]; 1025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner struct { 1045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t platform; 1055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t data_space; 1065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t data_length; 1075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t reserved; 1085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t data_offset; 1095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } parent_locator[8]; 1105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner}; 1115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnertypedef struct BDRVVPCState { 1135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BlockDriverState *hd; 1145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t footer_buf[HEADER_SIZE]; 1165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t free_data_block_offset; 1175d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int max_table_entries; 1185d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t *pagetable; 1195d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t bat_offset; 1205d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t last_bitmap_offset; 1215d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1225d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t block_size; 1235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t bitmap_size; 1245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#ifdef CACHE 1265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t *pageentry_u8; 1275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t *pageentry_u32; 1285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint16_t *pageentry_u16; 1295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1305d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t last_bitmap; 1315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#endif 1325d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} BDRVVPCState; 1335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic uint32_t vpc_checksum(uint8_t* buf, size_t size) 1355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 1365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t res = 0; 1375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int i; 1385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner for (i = 0; i < size; i++) 1405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner res += buf[i]; 1415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return ~res; 1435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 1445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) 1475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 1485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) 1495d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 100; 1505d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 1515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 1525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 153cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turnerstatic int vpc_open(BlockDriverState *bs, int flags) 1545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 1555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 156cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner int i; 1575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner struct vhd_footer* footer; 1585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner struct vhd_dyndisk_header* dyndisk_header; 1595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t buf[HEADER_SIZE]; 1605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t checksum; 1615d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 162cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE) 1635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 1645d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer = (struct vhd_footer*) s->footer_buf; 1665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (strncmp(footer->creator, "conectix", 8)) 1675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 1685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner checksum = be32_to_cpu(footer->checksum); 1705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->checksum = 0; 1715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) 1725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner fprintf(stderr, "block-vpc: The header checksum of '%s' is " 173cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner "incorrect.\n", bs->filename); 1745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // The visible size of a image in Virtual PC depends on the geometry 1765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // rather than on the size stored in the footer (the size in the footer 1775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // is too large usually) 1785d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner bs->total_sectors = (int64_t) 1795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; 1805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 181cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE) 1825d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner != HEADER_SIZE) 1835d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 1845d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1855d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header = (struct vhd_dyndisk_header*) buf; 1865d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1875d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (strncmp(dyndisk_header->magic, "cxsparse", 8)) 1885d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 1895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1905d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->block_size = be32_to_cpu(dyndisk_header->block_size); 1925d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; 1935d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1945d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); 1955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->pagetable = qemu_malloc(s->max_table_entries * 4); 1965d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 1975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); 198cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (bdrv_pread(bs->file, s->bat_offset, s->pagetable, 1995d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->max_table_entries * 4) != s->max_table_entries * 4) 2005d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 2015d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->free_data_block_offset = 2035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; 2045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner for (i = 0; i < s->max_table_entries; i++) { 2065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner be32_to_cpus(&s->pagetable[i]); 2075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (s->pagetable[i] != 0xFFFFFFFF) { 2085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t next = (512 * (int64_t) s->pagetable[i]) + 2095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->bitmap_size + s->block_size; 2105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (next> s->free_data_block_offset) 2125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->free_data_block_offset = next; 2135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 2145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 2155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->last_bitmap_offset = (int64_t) -1; 2175d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2185d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#ifdef CACHE 2195d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->pageentry_u8 = qemu_malloc(512); 2205d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->pageentry_u32 = s->pageentry_u8; 2215d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->pageentry_u16 = s->pageentry_u8; 2225d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->last_pagetable = -1; 2235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#endif 2245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 2265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner fail: 2275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 2285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 2295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2305d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/* 2315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Returns the absolute byte offset of the given sector in the image file. 2325d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * If the sector is not allocated, -1 is returned instead. 2335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 2345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * The parameter write must be 1 if the offset will be used for a write 2355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * operation (the block bitmaps is updated then), 0 otherwise. 2365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner */ 2375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic inline int64_t get_sector_offset(BlockDriverState *bs, 2385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t sector_num, int write) 2395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 2405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 2415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t offset = sector_num * 512; 2425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint64_t bitmap_offset, block_offset; 2435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t pagetable_index, pageentry_index; 2445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner pagetable_index = offset / s->block_size; 2465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner pageentry_index = (offset % s->block_size) / 512; 2475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) 2495d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; // not allocated 2505d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; 2525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); 2535d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // We must ensure that we don't write to any sectors which are marked as 2555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // unused in the bitmap. We get away with setting all bits in the block 2565d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // bitmap each time we write to a new block. This might cause Virtual PC to 2575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // miss sparse read optimization, but it's not a problem in terms of 2585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // correctness. 2595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (write && (s->last_bitmap_offset != bitmap_offset)) { 2605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t bitmap[s->bitmap_size]; 2615d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2625d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->last_bitmap_offset = bitmap_offset; 2635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner memset(bitmap, 0xff, s->bitmap_size); 264cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); 2655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 2665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", 2685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// sector_num, pagetable_index, pageentry_index, 2695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// bitmap_offset, block_offset); 2705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner// disabled by reason 2725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#if 0 2735d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#ifdef CACHE 2745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (bitmap_offset != s->last_bitmap) 2755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner { 2765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner lseek(s->fd, bitmap_offset, SEEK_SET); 2775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2785d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->last_bitmap = bitmap_offset; 2795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Scary! Bitmap is stored as big endian 32bit entries, 2815d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // while we used to look it up byte by byte 2825d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner read(s->fd, s->pageentry_u8, 512); 2835d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner for (i = 0; i < 128; i++) 2845d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner be32_to_cpus(&s->pageentry_u32[i]); 2855d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 2865d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2875d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) 2885d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 2895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#else 2905d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); 2915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2925d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner read(s->fd, &bitmap_entry, 1); 2935d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2945d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if ((bitmap_entry >> (pageentry_index % 8)) & 1) 2955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; // not allocated 2965d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#endif 2975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#endif 2985d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 2995d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return block_offset; 3005d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 3015d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/* 3035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Writes the footer to the end of the image file. This is needed when the 3045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * file grows as it overwrites the old footer 3055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 3065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Returns 0 on success and < 0 on error 3075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner */ 3085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int rewrite_footer(BlockDriverState* bs) 3095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 3105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int ret; 3115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 3125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t offset = s->free_data_block_offset; 3135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 314cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); 3155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (ret < 0) 3165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return ret; 3175d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3185d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 3195d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 3205d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3215d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/* 3225d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Allocates a new block. This involves writing a new footer and updating 3235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * the Block Allocation Table to use the space at the old end of the image 3245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * file (overwriting the old footer) 3255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 3265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Returns the sectors' offset in the image file on success and < 0 on error 3275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner */ 3285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) 3295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 3305d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 3315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t bat_offset; 3325d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t index, bat_value; 3335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int ret; 3345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t bitmap[s->bitmap_size]; 3355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Check if sector_num is valid 3375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if ((sector_num < 0) || (sector_num > bs->total_sectors)) 3385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 3395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write entry into in-memory BAT 3415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner index = (sector_num * 512) / s->block_size; 3425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (s->pagetable[index] != 0xFFFFFFFF) 3435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 3445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->pagetable[index] = s->free_data_block_offset / 512; 3465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Initialize the block's bitmap 3485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner memset(bitmap, 0xff, s->bitmap_size); 349cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, 350cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner s->bitmap_size); 3515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write new footer (the old one will be overwritten) 3535d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->free_data_block_offset += s->block_size + s->bitmap_size; 3545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner ret = rewrite_footer(bs); 3555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (ret < 0) 3565d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 3575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write BAT entry to disk 3595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner bat_offset = s->bat_offset + (4 * index); 3605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner bat_value = be32_to_cpu(s->pagetable[index]); 361cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); 3625d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (ret < 0) 3635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner goto fail; 3645d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return get_sector_offset(bs, sector_num, 0); 3665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerfail: 3685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner s->free_data_block_offset -= (s->block_size + s->bitmap_size); 3695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 3705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 3715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int vpc_read(BlockDriverState *bs, int64_t sector_num, 3735d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t *buf, int nb_sectors) 3745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 3755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 3765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int ret; 3775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t offset; 378cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner int64_t sectors, sectors_per_block; 3795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 3805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner while (nb_sectors > 0) { 3815d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner offset = get_sector_offset(bs, sector_num, 0); 3825d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 383cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 384cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors = sectors_per_block - (sector_num % sectors_per_block); 385cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (sectors > nb_sectors) { 386cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors = nb_sectors; 387cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 388cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner 3895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (offset == -1) { 390cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner memset(buf, 0, sectors * BDRV_SECTOR_SIZE); 3915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } else { 392cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner ret = bdrv_pread(bs->file, offset, buf, 393cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors * BDRV_SECTOR_SIZE); 394cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (ret != sectors * BDRV_SECTOR_SIZE) { 3955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 396cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 3975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 3985d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 399cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner nb_sectors -= sectors; 400cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sector_num += sectors; 401cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner buf += sectors * BDRV_SECTOR_SIZE; 4025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 4045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 4055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int vpc_write(BlockDriverState *bs, int64_t sector_num, 4075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner const uint8_t *buf, int nb_sectors) 4085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 4095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 4105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t offset; 411cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner int64_t sectors, sectors_per_block; 4125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int ret; 4135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner while (nb_sectors > 0) { 4155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner offset = get_sector_offset(bs, sector_num, 1); 4165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 417cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 418cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors = sectors_per_block - (sector_num % sectors_per_block); 419cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (sectors > nb_sectors) { 420cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors = nb_sectors; 421cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 422cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner 4235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (offset == -1) { 4245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner offset = alloc_block(bs, sector_num); 4255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (offset < 0) 4265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 4275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 429cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); 430cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (ret != sectors * BDRV_SECTOR_SIZE) { 4315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -1; 432cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 4335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 434cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner nb_sectors -= sectors; 435cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sector_num += sectors; 436cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner buf += sectors * BDRV_SECTOR_SIZE; 4375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 4405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 4415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner/* 4445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Calculates the number of cylinders, heads and sectors per cylinder 4455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * based on a given number of sectors. This is the algorithm described 4465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * in the VHD specification. 4475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 4485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Note that the geometry doesn't always exactly match total_sectors but 4495d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * may round it down. 4505d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * 4515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner * Returns 0 on success, -EFBIG if the size is larger than 127 GB 4525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner */ 4535d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int calculate_geometry(int64_t total_sectors, uint16_t* cyls, 4545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t* heads, uint8_t* secs_per_cyl) 4555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 4565d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint32_t cyls_times_heads; 4575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (total_sectors > 65535 * 16 * 255) 4595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EFBIG; 4605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4615d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (total_sectors > 65535 * 16 * 63) { 4625d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *secs_per_cyl = 255; 4635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *heads = 16; 4645d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner cyls_times_heads = total_sectors / *secs_per_cyl; 4655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } else { 4665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *secs_per_cyl = 17; 4675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner cyls_times_heads = total_sectors / *secs_per_cyl; 4685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *heads = (cyls_times_heads + 1023) / 1024; 4695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (*heads < 4) 4715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *heads = 4; 4725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4735d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { 4745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *secs_per_cyl = 31; 4755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *heads = 16; 4765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner cyls_times_heads = total_sectors / *secs_per_cyl; 4775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4785d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (cyls_times_heads >= (*heads * 1024)) { 4805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *secs_per_cyl = 63; 4815d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner *heads = 16; 4825d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner cyls_times_heads = total_sectors / *secs_per_cyl; 4835d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4845d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 4855d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 486cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner *cyls = cyls_times_heads / *heads; 4875d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4885d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 4895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 4905d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 4915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic int vpc_create(const char *filename, QEMUOptionParameter *options) 4925d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 4935d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner uint8_t buf[1024]; 4945d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner struct vhd_footer* footer = (struct vhd_footer*) buf; 4955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner struct vhd_dyndisk_header* dyndisk_header = 4965d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner (struct vhd_dyndisk_header*) buf; 4975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int fd, i; 498cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner uint16_t cyls = 0; 499cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner uint8_t heads = 0; 500cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner uint8_t secs_per_cyl = 0; 5015d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner size_t block_size, num_bat_entries; 5025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner int64_t total_sectors = 0; 5035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Read out options 5055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner while (options && options->name) { 5065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (!strcmp(options->name, "size")) { 5075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner total_sectors = options->value.n / 512; 5085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 5095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner options++; 5105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner } 5115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Create the file 5135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); 5145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (fd < 0) 5155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 517cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner /* Calculate matching total_size and geometry. Increase the number of 518cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner sectors requested until we get enough (or fail). */ 519cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { 520cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner if (calculate_geometry(total_sectors + i, 521cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner &cyls, &heads, &secs_per_cyl)) { 522cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner return -EFBIG; 523cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 524cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner } 5255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner total_sectors = (int64_t) cyls * heads * secs_per_cyl; 5265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Prepare the Hard Disk Footer 5285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner memset(buf, 0, 1024); 5295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 530cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner memcpy(footer->creator, "conectix", 8); 5315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // TODO Check if "qemu" creator_app is ok for VPC 532cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner memcpy(footer->creator_app, "qemu", 4); 533cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner memcpy(footer->creator_os, "Wi2k", 4); 5345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->features = be32_to_cpu(0x02); 5365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->version = be32_to_cpu(0x00010000); 5375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->data_offset = be64_to_cpu(HEADER_SIZE); 5385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); 5395d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5405d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Version of Virtual PC 2007 5415d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->major = be16_to_cpu(0x0005); 5425d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->minor =be16_to_cpu(0x0003); 5435d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5445d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->orig_size = be64_to_cpu(total_sectors * 512); 5455d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->size = be64_to_cpu(total_sectors * 512); 5465d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5475d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->cyls = be16_to_cpu(cyls); 5485d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->heads = heads; 5495d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->secs_per_cyl = secs_per_cyl; 5505d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5515d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->type = be32_to_cpu(VHD_DYNAMIC); 5525d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5535d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // TODO uuid is missing 5545d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5555d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); 5565d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5575d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write the footer (twice: at the beginning and at the end) 5585d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner block_size = 0x200000; 5595d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); 5605d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5615d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) 5625d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5635d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5645d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) 5655d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5665d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) 5675d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5685d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5695d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write the initial BAT 5705d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (lseek(fd, 3 * 512, SEEK_SET) < 0) 5715d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5725d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5735d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner memset(buf, 0xFF, 512); 5745d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) 5755d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (write(fd, buf, 512) != 512) 5765d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5775d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5785d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5795d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Prepare the Dynamic Disk Header 5805d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner memset(buf, 0, 1024); 5815d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 582cb42a1b1461e02efb034582ac5d8f71534723b92David 'Digit' Turner memcpy(dyndisk_header->magic, "cxsparse", 8); 5835d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5845d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF); 5855d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->table_offset = be64_to_cpu(3 * 512); 5865d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->version = be32_to_cpu(0x00010000); 5875d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->block_size = be32_to_cpu(block_size); 5885d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); 5895d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5905d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); 5915d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5925d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner // Write the header 5935d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (lseek(fd, 512, SEEK_SET) < 0) 5945d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5955d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner if (write(fd, buf, 1024) != 1024) 5965d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return -EIO; 5975d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 5985d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner close(fd); 5995d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner return 0; 6005d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 6015d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6025d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic void vpc_close(BlockDriverState *bs) 6035d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 6045d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner BDRVVPCState *s = bs->opaque; 6055d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner qemu_free(s->pagetable); 6065d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#ifdef CACHE 6075d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner qemu_free(s->pageentry_u8); 6085d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner#endif 6095d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 6105d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6115d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic QEMUOptionParameter vpc_create_options[] = { 6125d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner { 6135d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .name = BLOCK_OPT_SIZE, 6145d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .type = OPT_SIZE, 6155d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .help = "Virtual disk size" 6165d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner }, 6175d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner { NULL } 6185d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner}; 6195d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6205d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic BlockDriver bdrv_vpc = { 6215d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .format_name = "vpc", 6225d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .instance_size = sizeof(BDRVVPCState), 6235d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_probe = vpc_probe, 6245d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_open = vpc_open, 6255d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_read = vpc_read, 6265d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_write = vpc_write, 6275d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_close = vpc_close, 6285d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .bdrv_create = vpc_create, 6295d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6305d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner .create_options = vpc_create_options, 6315d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner}; 6325d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6335d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerstatic void bdrv_vpc_init(void) 6345d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner{ 6355d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner bdrv_register(&bdrv_vpc); 6365d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner} 6375d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turner 6385d8f37ad78fc66901af50c762029a501561f3b23David 'Digit' Turnerblock_init(bdrv_vpc_init); 639