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/* Mach devices.
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <device/device.h>
#include <assert.h>
#include <hurd/pager.h>
#include "dev.h"
#include "iostate.h"
/* ---------------------------------------------------------------- */
/* Returns a pointer to a new device structure in DEV for the kernel device
NAME, with the given FLAGS. If BLOCK_SIZE is non-zero, it should be the
desired block size, and must be a multiple of the device block size.
If an error occurs, the error code is returned, otherwise 0. */
error_t
dev_open(char *name, int flags, int block_size, struct dev **dev)
{
error_t err = 0;
static mach_port_t device_master = MACH_PORT_NULL;
*dev = malloc(sizeof (struct dev));
if (!(flags & DEV_SERIAL))
flags |= DEV_SEEKABLE;
if (*dev == NULL)
return ENOMEM;
(*dev)->name = malloc (strlen (name) + 1);
if ((*dev)->name)
strcpy ((*dev)->name, name);
else
err = ENOMEM;
(*dev)->port = MACH_PORT_NULL;
if (!err && device_master == MACH_PORT_NULL)
err = get_privileged_ports(NULL, &device_master);
if (!err)
err = device_open(device_master,
D_READ | (flags & DEV_READONLY ? D_WRITE : 0),
name, &(*dev)->port);
if (!err)
{
int count = DEV_GET_SIZE_COUNT;
int sizes[DEV_GET_SIZE_COUNT];
/* Get info about the device: total size (in bytes) and block size (in
bytes). Block size is unit in which device addressing is done. */
err = device_get_status((*dev)->port, DEV_GET_SIZE, sizes, &count);
if (!err)
{
(*dev)->size = sizes[DEV_GET_SIZE_DEVICE_SIZE];
(*dev)->dev_block_size = sizes[DEV_GET_SIZE_RECORD_SIZE];
}
}
if (!err)
{
if (block_size > 0)
if (block_size > (*dev)->dev_block_size
&& block_size % (*dev)->dev_block_size == 0)
(*dev)->block_size = block_size;
else
err = EINVAL;
else
(*dev)->block_size = (*dev)->dev_block_size;
if ((*dev)->dev_block_size == 1)
flags |= DEV_SERIAL;
(*dev)->flags = flags;
(*dev)->owner = 0;
}
if (!err)
err = io_state_init(&(*dev)->io_state, *dev);
if (err)
{
if ((*dev)->port != MACH_PORT_NULL)
mach_port_deallocate(mach_task_self(), (*dev)->port);
free(*dev);
}
return err;
}
/* Free DEV and any resources it consumes. */
void
dev_close(struct dev *dev)
{
if (!dev_is(dev, DEV_READONLY))
{
if (dev->pager != NULL)
pager_shutdown(dev->pager);
io_state_sync(&dev->io_state, dev);
}
device_close(dev->port);
io_state_finalize(&dev->io_state);
free(dev);
}
/* ---------------------------------------------------------------- */
/* Try and write out any pending writes to DEV. If WAIT is true, will wait
for any paging activity to cease. */
error_t
dev_sync(struct dev *dev, int wait)
{
error_t err = 0;
if (!dev_is(dev, DEV_READONLY))
{
struct io_state *ios = &dev->io_state;
io_state_lock(ios);
/* Sync any paged backing store. */
if (dev->pager != NULL)
pager_sync(dev->pager, wait);
/* Write out any stuff buffered in our io_state. */
err = io_state_sync(ios, dev);
io_state_unlock(ios);
}
return err;
}
/* ---------------------------------------------------------------- */
/* Writes AMOUNT bytes from the buffer pointed to by BUF to the device DEV.
*OFFS is incremented to reflect the amount read/written. Both AMOUNT and
*OFFS must be multiples of DEV's block size, and either BUF must be
page-aligned, or dev_write_valid() must return true for these arguments.
If an error occurs, the error code is returned, otherwise 0. */
error_t
dev_write(struct dev *dev,
vm_address_t buf, vm_size_t amount, vm_offset_t *offs)
{
int bsize = dev->dev_block_size;
vm_offset_t written = 0;
vm_offset_t block = (bsize == 1 ? *offs : *offs / bsize);
error_t err;
assert(dev_write_valid(dev, buf, amount, *offs));
assert(*offs % bsize == 0);
assert(amount % bsize == 0);
if (amount < IO_INBAND_MAX)
err =
device_write_inband (dev->port, 0, block,
(io_buf_ptr_t)buf, amount, &written);
else
err =
device_write (dev->port, 0, block, (io_buf_ptr_t)buf, amount, &written);
if (!err)
*offs += written;
return err;
}
/* Reads AMOUNT bytes from DEV and returns it in BUF and BUF_LEN (using the
standard mach out-array convention). *OFFS is incremented to reflect the
amount read/written. Both LEN and *OFFS must be multiples of DEV's block
size. If an error occurs, the error code is returned, otherwise 0. */
error_t
dev_read(struct dev *dev,
vm_address_t *buf, vm_size_t *buf_len, vm_size_t amount,
vm_offset_t *offs)
{
error_t err = 0;
int bsize = dev->dev_block_size;
vm_offset_t read = 0;
vm_offset_t block = (bsize == 1 ? *offs : *offs / bsize);
assert(*offs % bsize == 0);
assert(amount % bsize == 0);
if (amount < IO_INBAND_MAX)
{
if (*buf_len < amount)
err = vm_allocate(mach_task_self(), buf, amount, 1);
if (!err)
err =
device_read_inband(dev->port, 0, block,
amount, (io_buf_ptr_t)*buf, &read);
}
else
err =
device_read(dev->port, 0, block, amount, (io_buf_ptr_t *)buf, &read);
if (!err)
{
*offs += read;
*buf_len = read;
}
return err;
}
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