^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * scsicam.c - SCSI CAM support functions, use for HDIO_GETGEO, etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 1993, 1994 Drew Eckhardt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Visionary Computing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (Unix and Linux consulting and custom programming)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * drew@Colorado.EDU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * +1 (303) 786-7975
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * For more information, please consult the SCSI-CAM draft.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/genhd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/msdos_partition.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <scsi/scsicam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * scsi_bios_ptable - Read PC partition table out of first sector of device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @dev: from this device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Description: Reads the first sector from the device and returns %0x42 bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * starting at offset %0x1be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Returns: partition table in kmalloc(GFP_KERNEL) memory, or NULL on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned char *scsi_bios_ptable(struct block_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct address_space *mapping = dev->bd_contains->bd_inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned char *res = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) page = read_mapping_page(mapping, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (IS_ERR(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!PageError(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) res = kmemdup(page_address(page) + 0x1be, 66, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) EXPORT_SYMBOL(scsi_bios_ptable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * scsi_partsize - Parse cylinders/heads/sectors from PC partition table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @bdev: block device to parse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * @capacity: size of the disk in sectors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * @geom: output in form of [hds, cylinders, sectors]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Determine the BIOS mapping/geometry used to create the partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * table, storing the results in @geom.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Returns: %false on failure, %true on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) bool scsi_partsize(struct block_device *bdev, sector_t capacity, int geom[3])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int cyl, ext_cyl, end_head, end_cyl, end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned int logical_end, physical_end, ext_physical_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct msdos_partition *p, *largest = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) buf = scsi_bios_ptable(bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (*(unsigned short *) (buf + 64) == 0xAA55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int largest_cyl = -1, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) for (i = 0, p = buf; i < 4; i++, p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!p->sys_ind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) printk("scsicam_bios_param : partition %d has system \n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) cyl = p->cyl + ((p->sector & 0xc0) << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (cyl > largest_cyl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) largest_cyl = cyl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) largest = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (largest) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) end_cyl = largest->end_cyl + ((largest->end_sector & 0xc0) << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) end_head = largest->end_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) end_sector = largest->end_sector & 0x3f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (end_head + 1 == 0 || end_sector == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto out_free_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) printk("scsicam_bios_param : end at h = %d, c = %d, s = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) end_head, end_cyl, end_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) physical_end = end_cyl * (end_head + 1) * end_sector +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) end_head * end_sector + end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* This is the actual _sector_ number at the end */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) logical_end = get_unaligned_le32(&largest->start_sect)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) + get_unaligned_le32(&largest->nr_sects);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* This is for >1023 cylinders */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) ext_cyl = (logical_end - (end_head * end_sector + end_sector))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) / (end_head + 1) / end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ext_physical_end = ext_cyl * (end_head + 1) * end_sector +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) end_head * end_sector + end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) printk("scsicam_bios_param : logical_end=%d physical_end=%d ext_physical_end=%d ext_cyl=%d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ,logical_end, physical_end, ext_physical_end, ext_cyl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (logical_end == physical_end ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) (end_cyl == 1023 && ext_physical_end == logical_end)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) geom[0] = end_head + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) geom[1] = end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) geom[2] = (unsigned long)capacity /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ((end_head + 1) * end_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ret = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) goto out_free_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) printk("scsicam_bios_param : logical (%u) != physical (%u)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) logical_end, physical_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) out_free_buf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) EXPORT_SYMBOL(scsi_partsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * Function : static int setsize(unsigned long capacity,unsigned int *cyls,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * unsigned int *hds, unsigned int *secs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Purpose : to determine a near-optimal int 0x13 mapping for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * SCSI disk in terms of lost space of size capacity, storing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * the results in *cyls, *hds, and *secs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * Returns : -1 on failure, 0 on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * Extracted from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * WORKING X3T9.2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * DRAFT 792D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * see http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * Revision 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * 10-MAR-94
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * Information technology -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * SCSI-2 Common access method
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * transport and SCSI interface module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * ANNEX A :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * setsize() converts a read capacity value to int 13h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * head-cylinder-sector requirements. It minimizes the value for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * number of heads and maximizes the number of cylinders. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * will support rather large disks before the number of heads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * will not fit in 4 bits (or 6 bits). This algorithm also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * minimizes the number of sectors that will be unused at the end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * of the disk while allowing for very large disks to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * accommodated. This algorithm does not use physical geometry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) unsigned int *secs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) unsigned int rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unsigned long heads, sectors, cylinders, temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) cylinders = 1024L; /* Set number of cylinders to max */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) sectors = 62L; /* Maximize sectors per track */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) temp = cylinders * sectors; /* Compute divisor for heads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) heads = capacity / temp; /* Compute value for number of heads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (capacity % temp) { /* If no remainder, done! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) heads++; /* Else, increment number of heads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) temp = cylinders * heads; /* Compute divisor for sectors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) sectors = capacity / temp; /* Compute value for sectors per
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) track */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (capacity % temp) { /* If no remainder, done! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) sectors++; /* Else, increment number of sectors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) temp = heads * sectors; /* Compute divisor for cylinders */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) cylinders = capacity / temp; /* Compute number of cylinders */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (cylinders == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) rv = (unsigned) -1; /* Give error if 0 cylinders */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) *cyls = (unsigned int) cylinders; /* Stuff return values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) *secs = (unsigned int) sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) *hds = (unsigned int) heads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return (rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * scsicam_bios_param - Determine geometry of a disk in cylinders/heads/sectors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * @bdev: which device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * @capacity: size of the disk in sectors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * @ip: return value: ip[0]=heads, ip[1]=sectors, ip[2]=cylinders
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Description : determine the BIOS mapping/geometry used for a drive in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * SCSI-CAM system, storing the results in ip as required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * by the HDIO_GETGEO ioctl().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * Returns : -1 on failure, 0 on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int scsicam_bios_param(struct block_device *bdev, sector_t capacity, int *ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) u64 capacity64 = capacity; /* Suppress gcc warning */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /* try to infer mapping from partition table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (scsi_partsize(bdev, capacity, ip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (capacity64 < (1ULL << 32)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Pick some standard mapping with at most 1024 cylinders, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * at most 62 sectors per track - this works up to 7905 MB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) ret = setsize((unsigned long)capacity, (unsigned int *)ip + 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) (unsigned int *)ip + 0, (unsigned int *)ip + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * If something went wrong, then apparently we have to return a geometry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * with more than 1024 cylinders.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (ret || ip[0] > 255 || ip[1] > 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if ((capacity >> 11) > 65534) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ip[0] = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) ip[1] = 63;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ip[0] = 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) ip[1] = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (capacity > 65535*63*255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) ip[2] = 65535;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) ip[2] = (unsigned long)capacity / (ip[0] * ip[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) EXPORT_SYMBOL(scsicam_bios_param);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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