summaryrefslogtreecommitdiff
path: root/i386/i386at/gpl/linux/scsi/scsicam.c
diff options
context:
space:
mode:
Diffstat (limited to 'i386/i386at/gpl/linux/scsi/scsicam.c')
-rw-r--r--i386/i386at/gpl/linux/scsi/scsicam.c214
1 files changed, 0 insertions, 214 deletions
diff --git a/i386/i386at/gpl/linux/scsi/scsicam.c b/i386/i386at/gpl/linux/scsi/scsicam.c
deleted file mode 100644
index e4e4e76..0000000
--- a/i386/i386at/gpl/linux/scsi/scsicam.c
+++ /dev/null
@@ -1,214 +0,0 @@
-/*
- * scsicam.c - SCSI CAM support functions, use for HDIO_GETGEO, etc.
- *
- * Copyright 1993, 1994 Drew Eckhardt
- * Visionary Computing
- * (Unix and Linux consulting and custom programming)
- * drew@Colorado.EDU
- * +1 (303) 786-7975
- *
- * For more information, please consult the SCSI-CAM draft.
- */
-
-/*
- * Don't import our own symbols, as this would severely mess up our
- * symbol tables.
- */
-#define _SCSI_SYMS_VER_
-#define __NO_VERSION__
-#include <linux/module.h>
-
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/kernel.h>
-#include <linux/blk.h>
-#include "scsi.h"
-#include "hosts.h"
-#include "sd.h"
-
-static int partsize(struct buffer_head *bh, unsigned long capacity,
- unsigned int *cyls, unsigned int *hds, unsigned int *secs);
-static int setsize(unsigned long capacity,unsigned int *cyls,unsigned int *hds,
- unsigned int *secs);
-
-/*
- * Function : int scsicam_bios_param (Disk *disk, int dev, int *ip)
- *
- * Purpose : to determine the BIOS mapping used for a drive in a
- * SCSI-CAM system, storing the results in ip as required
- * by the HDIO_GETGEO ioctl().
- *
- * Returns : -1 on failure, 0 on success.
- *
- */
-
-int scsicam_bios_param (Disk *disk, /* SCSI disk */
- kdev_t dev, /* Device major, minor */
- int *ip /* Heads, sectors, cylinders in that order */) {
-
- struct buffer_head *bh;
- int ret_code;
- int size = disk->capacity;
-
- if (!(bh = bread(MKDEV(MAJOR(dev), MINOR(dev)&~0xf), 0, 1024)))
- return -1;
-
-#ifdef DEBUG
- printk ("scsicam_bios_param : trying existing mapping\n");
-#endif
- ret_code = partsize (bh, (unsigned long) size, (unsigned int *) ip + 2,
- (unsigned int *) ip + 0, (unsigned int *) ip + 1);
- brelse (bh);
-
- if (ret_code == -1) {
-#ifdef DEBUG
- printk ("scsicam_bios_param : trying optimal mapping\n");
-#endif
- ret_code = setsize ((unsigned long) size, (unsigned int *) ip + 2,
- (unsigned int *) ip + 0, (unsigned int *) ip + 1);
- }
-
- return ret_code;
-}
-
-/*
- * Function : static int partsize(struct buffer_head *bh, unsigned long
- * capacity,unsigned int *cyls, unsigned int *hds, unsigned int *secs);
- *
- * Purpose : to determine the BIOS mapping used to create the partition
- * table, storing the results in *cyls, *hds, and *secs
- *
- * Returns : -1 on failure, 0 on success.
- *
- */
-
-static int partsize(struct buffer_head *bh, unsigned long capacity,
- unsigned int *cyls, unsigned int *hds, unsigned int *secs) {
- struct partition *p, *largest = NULL;
- int i, largest_cyl;
- int cyl, ext_cyl, end_head, end_cyl, end_sector;
- unsigned int logical_end, physical_end, ext_physical_end;
-
-
- if (*(unsigned short *) (bh->b_data+510) == 0xAA55) {
- for (largest_cyl = -1, p = (struct partition *)
- (0x1BE + bh->b_data), i = 0; i < 4; ++i, ++p) {
- if (!p->sys_ind)
- continue;
-#ifdef DEBUG
- printk ("scsicam_bios_param : partition %d has system \n",
- i);
-#endif
- cyl = p->cyl + ((p->sector & 0xc0) << 2);
- if (cyl > largest_cyl) {
- largest_cyl = cyl;
- largest = p;
- }
- }
- }
-
- if (largest) {
- end_cyl = largest->end_cyl + ((largest->end_sector & 0xc0) << 2);
- end_head = largest->end_head;
- end_sector = largest->end_sector & 0x3f;
-
-#ifdef DEBUG
- printk ("scsicam_bios_param : end at h = %d, c = %d, s = %d\n",
- end_head, end_cyl, end_sector);
-#endif
-
- physical_end = end_cyl * (end_head + 1) * end_sector +
- end_head * end_sector + end_sector;
-
- /* This is the actual _sector_ number at the end */
- logical_end = largest->start_sect + largest->nr_sects;
-
- /* This is for >1023 cylinders */
- ext_cyl= (logical_end-(end_head * end_sector + end_sector))
- /(end_head + 1) / end_sector;
- ext_physical_end = ext_cyl * (end_head + 1) * end_sector +
- end_head * end_sector + end_sector;
-
-#ifdef DEBUG
- printk("scsicam_bios_param : logical_end=%d physical_end=%d ext_physical_end=%d ext_cyl=%d\n"
- ,logical_end,physical_end,ext_physical_end,ext_cyl);
-#endif
-
- if ((logical_end == physical_end) ||
- (end_cyl==1023 && ext_physical_end==logical_end)) {
- *secs = end_sector;
- *hds = end_head + 1;
- *cyls = capacity / ((end_head + 1) * end_sector);
- return 0;
- }
-
-#ifdef DEBUG
- printk ("scsicam_bios_param : logical (%u) != physical (%u)\n",
- logical_end, physical_end);
-#endif
- }
- return -1;
-}
-
-/*
- * Function : static int setsize(unsigned long capacity,unsigned int *cyls,
- * unsigned int *hds, unsigned int *secs);
- *
- * Purpose : to determine a near-optimal int 0x13 mapping for a
- * SCSI disk in terms of lost space of size capacity, storing
- * the results in *cyls, *hds, and *secs.
- *
- * Returns : -1 on failure, 0 on success.
- *
- * Extracted from
- *
- * WORKING X3T9.2
- * DRAFT 792D
- *
- *
- * Revision 6
- * 10-MAR-94
- * Information technology -
- * SCSI-2 Common access method
- * transport and SCSI interface module
- *
- * ANNEX A :
- *
- * setsize() converts a read capacity value to int 13h
- * head-cylinder-sector requirements. It minimizes the value for
- * number of heads and maximizes the number of cylinders. This
- * will support rather large disks before the number of heads
- * will not fit in 4 bits (or 6 bits). This algorithm also
- * minimizes the number of sectors that will be unused at the end
- * of the disk while allowing for very large disks to be
- * accommodated. This algorithm does not use physical geometry.
- */
-
-static int setsize(unsigned long capacity,unsigned int *cyls,unsigned int *hds,
- unsigned int *secs) {
- unsigned int rv = 0;
- unsigned long heads, sectors, cylinders, temp;
-
- cylinders = 1024L; /* Set number of cylinders to max */
- sectors = 62L; /* Maximize sectors per track */
-
- temp = cylinders * sectors; /* Compute divisor for heads */
- heads = capacity / temp; /* Compute value for number of heads */
- if (capacity % temp) { /* If no remainder, done! */
- heads++; /* Else, increment number of heads */
- temp = cylinders * heads; /* Compute divisor for sectors */
- sectors = capacity / temp; /* Compute value for sectors per
- track */
- if (capacity % temp) { /* If no remainder, done! */
- sectors++; /* Else, increment number of sectors */
- temp = heads * sectors; /* Compute divisor for cylinders */
- cylinders = capacity / temp;/* Compute number of cylinders */
- }
- }
- if (cylinders == 0) rv=(unsigned)-1;/* Give error if 0 cylinders */
-
- *cyls = (unsigned int) cylinders; /* Stuff return values */
- *secs = (unsigned int) sectors;
- *hds = (unsigned int) heads;
- return(rv);
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-04-02 01:16:13 +0000