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linux-pinenote/drivers/ide/ide-taskfile.c
Alan Cox 3a42bb223f [PATCH] ide: add sanity checking to ide taskfile ioctl 
Without this the user can feed in bogus values and get very bogus
results. Security impact is minimal as this ioctl isn't available to
unpriviledged processes anyway.

Reported to the l/k list and found with an auditing tool.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-16 08:27:54 -07:00

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/*
* linux/drivers/ide/ide-taskfile.c Version 0.38 March 05, 2003
*
* Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org>
* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2001-2002 Klaus Smolin
* IBM Storage Technology Division
* Copyright (C) 2003-2004 Bartlomiej Zolnierkiewicz
*
* The big the bad and the ugly.
*
* Problems to be fixed because of BH interface or the lack therefore.
*
* Fill me in stupid !!!
*
* HOST:
* General refers to the Controller and Driver "pair".
* DATA HANDLER:
* Under the context of Linux it generally refers to an interrupt handler.
* However, it correctly describes the 'HOST'
* DATA BLOCK:
* The amount of data needed to be transfered as predefined in the
* setup of the device.
* STORAGE ATOMIC:
* The 'DATA BLOCK' associated to the 'DATA HANDLER', and can be as
* small as a single sector or as large as the entire command block
* request.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
static void ata_bswap_data (void *buffer, int wcount)
{
u16 *p = buffer;
while (wcount--) {
*p = *p << 8 | *p >> 8; p++;
*p = *p << 8 | *p >> 8; p++;
}
}
static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
HWIF(drive)->ata_input_data(drive, buffer, wcount);
if (drive->bswap)
ata_bswap_data(buffer, wcount);
}
static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
if (drive->bswap) {
ata_bswap_data(buffer, wcount);
HWIF(drive)->ata_output_data(drive, buffer, wcount);
ata_bswap_data(buffer, wcount);
} else {
HWIF(drive)->ata_output_data(drive, buffer, wcount);
}
}
int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
if (drive->media == ide_disk)
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_IDENTIFY;
else
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_PIDENTIFY;
args.command_type = IDE_DRIVE_TASK_IN;
args.data_phase = TASKFILE_IN;
args.handler = &task_in_intr;
return ide_raw_taskfile(drive, &args, buf);
}
ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
{
ide_hwif_t *hwif = HWIF(drive);
task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
u8 HIHI = (drive->addressing == 1) ? 0xE0 : 0xEF;
/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
if (IDE_CONTROL_REG) {
/* clear nIEN */
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
}
SELECT_MASK(drive, 0);
if (drive->addressing == 1) {
hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
}
hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
if (task->handler != NULL) {
if (task->prehandler != NULL) {
hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
ndelay(400); /* FIXME */
return task->prehandler(drive, task->rq);
}
ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
return ide_started;
}
if (!drive->using_dma)
return ide_stopped;
switch (taskfile->command) {
case WIN_WRITEDMA_ONCE:
case WIN_WRITEDMA:
case WIN_WRITEDMA_EXT:
case WIN_READDMA_ONCE:
case WIN_READDMA:
case WIN_READDMA_EXT:
case WIN_IDENTIFY_DMA:
if (!hwif->dma_setup(drive)) {
hwif->dma_exec_cmd(drive, taskfile->command);
hwif->dma_start(drive);
return ide_started;
}
break;
default:
if (task->handler == NULL)
return ide_stopped;
}
return ide_stopped;
}
/*
* set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
*/
ide_startstop_t set_multmode_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
drive->mult_count = drive->mult_req;
} else {
drive->mult_req = drive->mult_count = 0;
drive->special.b.recalibrate = 1;
(void) ide_dump_status(drive, "set_multmode", stat);
}
return ide_stopped;
}
/*
* set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
*/
ide_startstop_t set_geometry_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
int retries = 5;
u8 stat;
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
udelay(10);
if (OK_STAT(stat, READY_STAT, BAD_STAT))
return ide_stopped;
if (stat & (ERR_STAT|DRQ_STAT))
return ide_error(drive, "set_geometry_intr", stat);
BUG_ON(HWGROUP(drive)->handler != NULL);
ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
/*
* recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
*/
ide_startstop_t recal_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
return ide_error(drive, "recal_intr", stat);
return ide_stopped;
}
/*
* Handler for commands without a data phase
*/
ide_startstop_t task_no_data_intr (ide_drive_t *drive)
{
ide_task_t *args = HWGROUP(drive)->rq->special;
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
local_irq_enable_in_hardirq();
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
return ide_error(drive, "task_no_data_intr", stat);
/* calls ide_end_drive_cmd */
}
if (args)
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
return ide_stopped;
}
EXPORT_SYMBOL(task_no_data_intr);
static u8 wait_drive_not_busy(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
int retries = 100;
u8 stat;
/*
* Last sector was transfered, wait until drive is ready.
* This can take up to 10 usec, but we will wait max 1 ms
* (drive_cmd_intr() waits that long).
*/
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
udelay(10);
if (!retries)
printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
return stat;
}
static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
struct page *page;
#ifdef CONFIG_HIGHMEM
unsigned long flags;
#endif
unsigned int offset;
u8 *buf;
page = sg[hwif->cursg].page;
offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
#ifdef CONFIG_HIGHMEM
local_irq_save(flags);
#endif
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
hwif->nleft--;
hwif->cursg_ofs++;
if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
hwif->cursg++;
hwif->cursg_ofs = 0;
}
/* do the actual data transfer */
if (write)
taskfile_output_data(drive, buf, SECTOR_WORDS);
else
taskfile_input_data(drive, buf, SECTOR_WORDS);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
local_irq_restore(flags);
#endif
}
static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
{
unsigned int nsect;
nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
while (nsect--)
ide_pio_sector(drive, write);
}
static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
unsigned int write)
{
if (rq->bio) /* fs request */
rq->errors = 0;
touch_softlockup_watchdog();
switch (drive->hwif->data_phase) {
case TASKFILE_MULTI_IN:
case TASKFILE_MULTI_OUT:
ide_pio_multi(drive, write);
break;
default:
ide_pio_sector(drive, write);
break;
}
}
static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
const char *s, u8 stat)
{
if (rq->bio) {
ide_hwif_t *hwif = drive->hwif;
int sectors = hwif->nsect - hwif->nleft;
switch (hwif->data_phase) {
case TASKFILE_IN:
if (hwif->nleft)
break;
/* fall through */
case TASKFILE_OUT:
sectors--;
break;
case TASKFILE_MULTI_IN:
if (hwif->nleft)
break;
/* fall through */
case TASKFILE_MULTI_OUT:
sectors -= drive->mult_count;
default:
break;
}
if (sectors > 0) {
ide_driver_t *drv;
drv = *(ide_driver_t **)rq->rq_disk->private_data;
drv->end_request(drive, 1, sectors);
}
}
return ide_error(drive, s, stat);
}
static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = rq->special;
if (task->tf_out_flags.all) {
u8 err = drive->hwif->INB(IDE_ERROR_REG);
ide_end_drive_cmd(drive, stat, err);
return;
}
}
if (rq->rq_disk) {
ide_driver_t *drv;
drv = *(ide_driver_t **)rq->rq_disk->private_data;;
drv->end_request(drive, 1, rq->hard_nr_sectors);
} else
ide_end_request(drive, 1, rq->hard_nr_sectors);
}
/*
* Handler for command with PIO data-in phase (Read/Read Multiple).
*/
ide_startstop_t task_in_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
u8 stat = hwif->INB(IDE_STATUS_REG);
/* new way for dealing with premature shared PCI interrupts */
if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
if (stat & (ERR_STAT | DRQ_STAT))
return task_error(drive, rq, __FUNCTION__, stat);
/* No data yet, so wait for another IRQ. */
ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
ide_pio_datablock(drive, rq, 0);
/* If it was the last datablock check status and finish transfer. */
if (!hwif->nleft) {
stat = wait_drive_not_busy(drive);
if (!OK_STAT(stat, 0, BAD_R_STAT))
return task_error(drive, rq, __FUNCTION__, stat);
task_end_request(drive, rq, stat);
return ide_stopped;
}
/* Still data left to transfer. */
ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
EXPORT_SYMBOL(task_in_intr);
/*
* Handler for command with PIO data-out phase (Write/Write Multiple).
*/
static ide_startstop_t task_out_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
u8 stat = hwif->INB(IDE_STATUS_REG);
if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
return task_error(drive, rq, __FUNCTION__, stat);
/* Deal with unexpected ATA data phase. */
if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
return task_error(drive, rq, __FUNCTION__, stat);
if (!hwif->nleft) {
task_end_request(drive, rq, stat);
return ide_stopped;
}
/* Still data left to transfer. */
ide_pio_datablock(drive, rq, 1);
ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
{
ide_startstop_t startstop;
if (ide_wait_stat(&startstop, drive, DATA_READY,
drive->bad_wstat, WAIT_DRQ)) {
printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
drive->name,
drive->hwif->data_phase ? "MULT" : "",
drive->addressing ? "_EXT" : "");
return startstop;
}
if (!drive->unmask)
local_irq_disable();
ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
ide_pio_datablock(drive, rq, 1);
return ide_started;
}
EXPORT_SYMBOL(pre_task_out_intr);
static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
{
struct request rq;
memset(&rq, 0, sizeof(rq));
rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
rq.buffer = buf;
/*
* (ks) We transfer currently only whole sectors.
* This is suffient for now. But, it would be great,
* if we would find a solution to transfer any size.
* To support special commands like READ LONG.
*/
if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
if (data_size == 0)
rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
else
rq.nr_sectors = data_size / SECTOR_SIZE;
if (!rq.nr_sectors) {
printk(KERN_ERR "%s: in/out command without data\n",
drive->name);
return -EFAULT;
}
rq.hard_nr_sectors = rq.nr_sectors;
rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
rq.cmd_flags |= REQ_RW;
}
rq.special = args;
args->rq = &rq;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
{
return ide_diag_taskfile(drive, args, 0, buf);
}
EXPORT_SYMBOL(ide_raw_taskfile);
int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
ide_task_request_t *req_task;
ide_task_t args;
u8 *outbuf = NULL;
u8 *inbuf = NULL;
task_ioreg_t *argsptr = args.tfRegister;
task_ioreg_t *hobsptr = args.hobRegister;
int err = 0;
int tasksize = sizeof(struct ide_task_request_s);
unsigned int taskin = 0;
unsigned int taskout = 0;
u8 io_32bit = drive->io_32bit;
char __user *buf = (char __user *)arg;
// printk("IDE Taskfile ...\n");
req_task = kzalloc(tasksize, GFP_KERNEL);
if (req_task == NULL) return -ENOMEM;
if (copy_from_user(req_task, buf, tasksize)) {
kfree(req_task);
return -EFAULT;
}
taskout = req_task->out_size;
taskin = req_task->in_size;
if (taskin > 65536 || taskout > 65536) {
err = -EINVAL;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
outbuf = kzalloc(taskout, GFP_KERNEL);
if (outbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(outbuf, buf + outtotal, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
inbuf = kzalloc(taskin, GFP_KERNEL);
if (inbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(inbuf, buf + intotal, taskin)) {
err = -EFAULT;
goto abort;
}
}
memset(&args, 0, sizeof(ide_task_t));
memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
args.tf_in_flags = req_task->in_flags;
args.tf_out_flags = req_task->out_flags;
args.data_phase = req_task->data_phase;
args.command_type = req_task->req_cmd;
drive->io_32bit = 0;
switch(req_task->data_phase) {
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
err = ide_diag_taskfile(drive, &args, taskout, outbuf);
break;
case TASKFILE_IN_DMAQ:
case TASKFILE_IN_DMA:
err = ide_diag_taskfile(drive, &args, taskin, inbuf);
break;
case TASKFILE_MULTI_OUT:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
printk(KERN_ERR "%s: %s Multimode Write " \
"multcount is not set\n",
drive->name, __FUNCTION__);
err = -EPERM;
goto abort;
}
/* fall through */
case TASKFILE_OUT:
args.prehandler = &pre_task_out_intr;
args.handler = &task_out_intr;
err = ide_diag_taskfile(drive, &args, taskout, outbuf);
break;
case TASKFILE_MULTI_IN:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
printk(KERN_ERR "%s: %s Multimode Read failure " \
"multcount is not set\n",
drive->name, __FUNCTION__);
err = -EPERM;
goto abort;
}
/* fall through */
case TASKFILE_IN:
args.handler = &task_in_intr;
err = ide_diag_taskfile(drive, &args, taskin, inbuf);
break;
case TASKFILE_NO_DATA:
args.handler = &task_no_data_intr;
err = ide_diag_taskfile(drive, &args, 0, NULL);
break;
default:
err = -EFAULT;
goto abort;
}
memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
req_task->in_flags = args.tf_in_flags;
req_task->out_flags = args.tf_out_flags;
if (copy_to_user(buf, req_task, tasksize)) {
err = -EFAULT;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
if (copy_to_user(buf + outtotal, outbuf, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
if (copy_to_user(buf + intotal, inbuf, taskin)) {
err = -EFAULT;
goto abort;
}
}
abort:
kfree(req_task);
kfree(outbuf);
kfree(inbuf);
// printk("IDE Taskfile ioctl ended. rc = %i\n", err);
drive->io_32bit = io_32bit;
return err;
}
int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
{
struct request rq;
u8 buffer[4];
if (!buf)
buf = buffer;
memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
ide_init_drive_cmd(&rq);
rq.buffer = buf;
*buf++ = cmd;
*buf++ = nsect;
*buf++ = feature;
*buf++ = sectors;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
/*
* FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
*/
int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
int err = 0;
u8 args[4], *argbuf = args;
u8 xfer_rate = 0;
int argsize = 4;
ide_task_t tfargs;
if (NULL == (void *) arg) {
struct request rq;
ide_init_drive_cmd(&rq);
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
if (copy_from_user(args, (void __user *)arg, 4))
return -EFAULT;
memset(&tfargs, 0, sizeof(ide_task_t));
tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
tfargs.tfRegister[IDE_SECTOR_OFFSET] = args[1];
tfargs.tfRegister[IDE_LCYL_OFFSET] = 0x00;
tfargs.tfRegister[IDE_HCYL_OFFSET] = 0x00;
tfargs.tfRegister[IDE_SELECT_OFFSET] = 0x00;
tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
if (args[3]) {
argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
argbuf = kzalloc(argsize, GFP_KERNEL);
if (argbuf == NULL)
return -ENOMEM;
}
if (set_transfer(drive, &tfargs)) {
xfer_rate = args[1];
if (ide_ata66_check(drive, &tfargs))
goto abort;
}
err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
if (!err && xfer_rate) {
/* active-retuning-calls future */
ide_set_xfer_rate(drive, xfer_rate);
ide_driveid_update(drive);
}
abort:
if (copy_to_user((void __user *)arg, argbuf, argsize))
err = -EFAULT;
if (argsize > 4)
kfree(argbuf);
return err;
}
static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
{
struct request rq;
ide_init_drive_cmd(&rq);
rq.cmd_type = REQ_TYPE_ATA_TASK;
rq.buffer = buf;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
/*
* FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
*/
int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
void __user *p = (void __user *)arg;
int err = 0;
u8 args[7], *argbuf = args;
int argsize = 7;
if (copy_from_user(args, p, 7))
return -EFAULT;
err = ide_wait_cmd_task(drive, argbuf);
if (copy_to_user(p, argbuf, argsize))
err = -EFAULT;
return err;
}
/*
* NOTICE: This is additions from IBM to provide a discrete interface,
* for selective taskregister access operations. Nice JOB Klaus!!!
* Glad to be able to work and co-develop this with you and IBM.
*/
ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
{
ide_hwif_t *hwif = HWIF(drive);
task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
if (task->data_phase == TASKFILE_MULTI_IN ||
task->data_phase == TASKFILE_MULTI_OUT) {
if (!drive->mult_count) {
printk(KERN_ERR "%s: multimode not set!\n", drive->name);
return ide_stopped;
}
}
/*
* (ks) Check taskfile in flags.
* If set, then execute as it is defined.
* If not set, then define default settings.
* The default values are:
* read all taskfile registers (except data)
* read the hob registers (sector, nsector, lcyl, hcyl)
*/
if (task->tf_in_flags.all == 0) {
task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
if (drive->addressing == 1)
task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
}
/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
if (IDE_CONTROL_REG)
/* clear nIEN */
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
SELECT_MASK(drive, 0);
if (task->tf_out_flags.b.data) {
u16 data = taskfile->data + (hobfile->data << 8);
hwif->OUTW(data, IDE_DATA_REG);
}
/* (ks) send hob registers first */
if (task->tf_out_flags.b.nsector_hob)
hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
if (task->tf_out_flags.b.sector_hob)
hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
if (task->tf_out_flags.b.lcyl_hob)
hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
if (task->tf_out_flags.b.hcyl_hob)
hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
/* (ks) Send now the standard registers */
if (task->tf_out_flags.b.error_feature)
hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
/* refers to number of sectors to transfer */
if (task->tf_out_flags.b.nsector)
hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
/* refers to sector offset or start sector */
if (task->tf_out_flags.b.sector)
hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
if (task->tf_out_flags.b.lcyl)
hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
if (task->tf_out_flags.b.hcyl)
hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
/*
* (ks) In the flagged taskfile approch, we will use all specified
* registers and the register value will not be changed, except the
* select bit (master/slave) in the drive_head register. We must make
* sure that the desired drive is selected.
*/
hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
switch(task->data_phase) {
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
case TASKFILE_IN_DMAQ:
case TASKFILE_IN_DMA:
hwif->dma_setup(drive);
hwif->dma_exec_cmd(drive, taskfile->command);
hwif->dma_start(drive);
break;
default:
if (task->handler == NULL)
return ide_stopped;
/* Issue the command */
if (task->prehandler) {
hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
ndelay(400); /* FIXME */
return task->prehandler(drive, task->rq);
}
ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
}
return ide_started;
}
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