diff options
Diffstat (limited to 'qemu/hw/block/hd-geometry.c')
| -rw-r--r-- | qemu/hw/block/hd-geometry.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/qemu/hw/block/hd-geometry.c b/qemu/hw/block/hd-geometry.c deleted file mode 100644 index 6d02192db..000000000 --- a/qemu/hw/block/hd-geometry.c +++ /dev/null @@ -1,166 +0,0 @@ -/* - * Hard disk geometry utilities - * - * Copyright (C) 2012 Red Hat, Inc. - * - * This work is licensed under the terms of the GNU GPL, version 2 or later. - * See the COPYING file in the top-level directory. - * - * This file incorporates work covered by the following copyright and - * permission notice: - * - * Copyright (c) 2003 Fabrice Bellard - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -#include "qemu/osdep.h" -#include "sysemu/block-backend.h" -#include "hw/block/block.h" -#include "trace.h" - -struct partition { - uint8_t boot_ind; /* 0x80 - active */ - uint8_t head; /* starting head */ - uint8_t sector; /* starting sector */ - uint8_t cyl; /* starting cylinder */ - uint8_t sys_ind; /* What partition type */ - uint8_t end_head; /* end head */ - uint8_t end_sector; /* end sector */ - uint8_t end_cyl; /* end cylinder */ - uint32_t start_sect; /* starting sector counting from 0 */ - uint32_t nr_sects; /* nr of sectors in partition */ -} QEMU_PACKED; - -/* try to guess the disk logical geometry from the MSDOS partition table. - Return 0 if OK, -1 if could not guess */ -static int guess_disk_lchs(BlockBackend *blk, - int *pcylinders, int *pheads, int *psectors) -{ - uint8_t buf[BDRV_SECTOR_SIZE]; - int i, heads, sectors, cylinders; - struct partition *p; - uint32_t nr_sects; - uint64_t nb_sectors; - - blk_get_geometry(blk, &nb_sectors); - - /** - * The function will be invoked during startup not only in sync I/O mode, - * but also in async I/O mode. So the I/O throttling function has to - * be disabled temporarily here, not permanently. - */ - if (blk_read_unthrottled(blk, 0, buf, 1) < 0) { - return -1; - } - /* test msdos magic */ - if (buf[510] != 0x55 || buf[511] != 0xaa) { - return -1; - } - for (i = 0; i < 4; i++) { - p = ((struct partition *)(buf + 0x1be)) + i; - nr_sects = le32_to_cpu(p->nr_sects); - if (nr_sects && p->end_head) { - /* We make the assumption that the partition terminates on - a cylinder boundary */ - heads = p->end_head + 1; - sectors = p->end_sector & 63; - if (sectors == 0) { - continue; - } - cylinders = nb_sectors / (heads * sectors); - if (cylinders < 1 || cylinders > 16383) { - continue; - } - *pheads = heads; - *psectors = sectors; - *pcylinders = cylinders; - trace_hd_geometry_lchs_guess(blk, cylinders, heads, sectors); - return 0; - } - } - return -1; -} - -static void guess_chs_for_size(BlockBackend *blk, - uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs) -{ - uint64_t nb_sectors; - int cylinders; - - blk_get_geometry(blk, &nb_sectors); - - cylinders = nb_sectors / (16 * 63); - if (cylinders > 16383) { - cylinders = 16383; - } else if (cylinders < 2) { - cylinders = 2; - } - *pcyls = cylinders; - *pheads = 16; - *psecs = 63; -} - -void hd_geometry_guess(BlockBackend *blk, - uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs, - int *ptrans) -{ - int cylinders, heads, secs, translation; - HDGeometry geo; - - /* Try to probe the backing device geometry, otherwise fallback - to the old logic. (as of 12/2014 probing only succeeds on DASDs) */ - if (blk_probe_geometry(blk, &geo) == 0) { - *pcyls = geo.cylinders; - *psecs = geo.sectors; - *pheads = geo.heads; - translation = BIOS_ATA_TRANSLATION_NONE; - } else if (guess_disk_lchs(blk, &cylinders, &heads, &secs) < 0) { - /* no LCHS guess: use a standard physical disk geometry */ - guess_chs_for_size(blk, pcyls, pheads, psecs); - translation = hd_bios_chs_auto_trans(*pcyls, *pheads, *psecs); - } else if (heads > 16) { - /* LCHS guess with heads > 16 means that a BIOS LBA - translation was active, so a standard physical disk - geometry is OK */ - guess_chs_for_size(blk, pcyls, pheads, psecs); - translation = *pcyls * *pheads <= 131072 - ? BIOS_ATA_TRANSLATION_LARGE - : BIOS_ATA_TRANSLATION_LBA; - } else { - /* LCHS guess with heads <= 16: use as physical geometry */ - *pcyls = cylinders; - *pheads = heads; - *psecs = secs; - /* disable any translation to be in sync with - the logical geometry */ - translation = BIOS_ATA_TRANSLATION_NONE; - } - if (ptrans) { - *ptrans = translation; - } - trace_hd_geometry_guess(blk, *pcyls, *pheads, *psecs, translation); -} - -int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs) -{ - return cyls <= 1024 && heads <= 16 && secs <= 63 - ? BIOS_ATA_TRANSLATION_NONE - : BIOS_ATA_TRANSLATION_LBA; -} |