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- /*
- * Mach Operating System
- * Copyright (c) 1993,1991,1990,1989 Carnegie Mellon University
- * All Rights Reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
- * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
- * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie Mellon
- * the rights to redistribute these changes.
- */
- /*
- * Author: David B. Golub, Carnegie Mellon University
- * Date: 3/89
- */
- /*
- * Mach device server routines (i386at version).
- *
- * Copyright (c) 1996 The University of Utah and
- * the Computer Systems Laboratory at the University of Utah (CSL).
- * All rights reserved.
- *
- * Permission to use, copy, modify and distribute this software is hereby
- * granted provided that (1) source code retains these copyright, permission,
- * and disclaimer notices, and (2) redistributions including binaries
- * reproduce the notices in supporting documentation, and (3) all advertising
- * materials mentioning features or use of this software display the following
- * acknowledgement: ``This product includes software developed by the
- * Computer Systems Laboratory at the University of Utah.''
- *
- * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
- * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
- * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * CSL requests users of this software to return to csl-dist@cs.utah.edu any
- * improvements that they make and grant CSL redistribution rights.
- *
- * Author: Shantanu Goel, University of Utah CSL
- */
- #include <kern/printf.h>
- #include <string.h>
- #include <mach/boolean.h>
- #include <mach/kern_return.h>
- #include <mach/mig_errors.h>
- #include <mach/port.h>
- #include <mach/vm_param.h>
- #include <mach/notify.h>
- #include <machine/locore.h>
- #include <machine/machspl.h> /* spl definitions */
- #include <ipc/ipc_port.h>
- #include <ipc/ipc_space.h>
- #include <kern/ast.h>
- #include <kern/counters.h>
- #include <kern/debug.h>
- #include <kern/printf.h>
- #include <kern/queue.h>
- #include <kern/slab.h>
- #include <kern/thread.h>
- #include <kern/task.h>
- #include <kern/sched_prim.h>
- #include <vm/memory_object.h>
- #include <vm/vm_map.h>
- #include <vm/vm_kern.h>
- #include <vm/vm_user.h>
- #include <device/device_types.h>
- #include <device/dev_hdr.h>
- #include <device/conf.h>
- #include <device/io_req.h>
- #include <device/ds_routines.h>
- #include <device/net_status.h>
- #include <device/device_port.h>
- #include <device/device_reply.user.h>
- #include <device/device_emul.h>
- #include <machine/machspl.h>
- #ifdef LINUX_DEV
- extern struct device_emulation_ops linux_block_emulation_ops;
- #ifdef CONFIG_INET
- extern struct device_emulation_ops linux_net_emulation_ops;
- extern void free_skbuffs (void);
- #ifdef CONFIG_PCMCIA
- extern struct device_emulation_ops linux_pcmcia_emulation_ops;
- #endif /* CONFIG_PCMCIA */
- #endif /* CONFIG_INET */
- #endif /* LINUX_DEV */
- #ifdef MACH_HYP
- extern struct device_emulation_ops hyp_block_emulation_ops;
- extern struct device_emulation_ops hyp_net_emulation_ops;
- #endif /* MACH_HYP */
- extern struct device_emulation_ops mach_device_emulation_ops;
- /* List of emulations. */
- static struct device_emulation_ops *emulation_list[] =
- {
- #ifdef LINUX_DEV
- &linux_block_emulation_ops,
- #ifdef CONFIG_INET
- &linux_net_emulation_ops,
- #ifdef CONFIG_PCMCIA
- &linux_pcmcia_emulation_ops,
- #endif /* CONFIG_PCMCIA */
- #endif /* CONFIG_INET */
- #endif /* LINUX_DEV */
- #ifdef MACH_HYP
- &hyp_block_emulation_ops,
- &hyp_net_emulation_ops,
- #endif /* MACH_HYP */
- &mach_device_emulation_ops,
- };
- static struct vm_map device_io_map_store;
- vm_map_t device_io_map = &device_io_map_store;
- #define NUM_EMULATION (sizeof (emulation_list) / sizeof (emulation_list[0]))
- io_return_t
- ds_device_open (ipc_port_t open_port, ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type, dev_mode_t mode,
- char *name, device_t *devp)
- {
- unsigned i;
- io_return_t err;
- /* Open must be called on the master device port. */
- if (open_port != master_device_port)
- return D_INVALID_OPERATION;
- /* There must be a reply port. */
- if (! IP_VALID (reply_port))
- {
- printf ("ds_* invalid reply port\n");
- SoftDebugger ("ds_* reply_port");
- return MIG_NO_REPLY;
- }
- /* Call each emulation's open routine to find the device. */
- for (i = 0; i < NUM_EMULATION; i++)
- {
- err = (*emulation_list[i]->open) (reply_port, reply_port_type,
- mode, name, devp);
- if (err != D_NO_SUCH_DEVICE)
- break;
- }
- return err;
- }
- io_return_t
- ds_device_close (device_t dev)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- return (dev->emul_ops->close
- ? (*dev->emul_ops->close) (dev->emul_data)
- : D_SUCCESS);
- }
- io_return_t
- ds_device_write (device_t dev, ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type, dev_mode_t mode,
- recnum_t recnum, io_buf_ptr_t data, unsigned int count,
- int *bytes_written)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (data == 0)
- return D_INVALID_SIZE;
- if (! dev->emul_ops->write)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->write) (dev->emul_data, reply_port,
- reply_port_type, mode, recnum,
- data, count, bytes_written);
- }
- io_return_t
- ds_device_write_inband (device_t dev, ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode, recnum_t recnum,
- io_buf_ptr_inband_t data, unsigned count,
- int *bytes_written)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (data == 0)
- return D_INVALID_SIZE;
- if (! dev->emul_ops->write_inband)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->write_inband) (dev->emul_data, reply_port,
- reply_port_type, mode, recnum,
- data, count, bytes_written);
- }
- io_return_t
- ds_device_read (device_t dev, ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type, dev_mode_t mode,
- recnum_t recnum, int count, io_buf_ptr_t *data,
- unsigned *bytes_read)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->read)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->read) (dev->emul_data, reply_port,
- reply_port_type, mode, recnum,
- count, data, bytes_read);
- }
- io_return_t
- ds_device_read_inband (device_t dev, ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type, dev_mode_t mode,
- recnum_t recnum, int count, char *data,
- unsigned *bytes_read)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->read_inband)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->read_inband) (dev->emul_data, reply_port,
- reply_port_type, mode, recnum,
- count, data, bytes_read);
- }
- io_return_t
- ds_device_set_status (device_t dev, dev_flavor_t flavor,
- dev_status_t status, mach_msg_type_number_t status_count)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->set_status)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->set_status) (dev->emul_data, flavor, status,
- status_count);
- }
- io_return_t
- ds_device_get_status (device_t dev, dev_flavor_t flavor, dev_status_t status,
- mach_msg_type_number_t *status_count)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->get_status)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->get_status) (dev->emul_data, flavor, status,
- status_count);
- }
- io_return_t
- ds_device_set_filter (device_t dev, ipc_port_t receive_port, int priority,
- filter_t *filter, unsigned filter_count)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->set_filter)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->set_filter) (dev->emul_data, receive_port,
- priority, filter, filter_count);
- }
- io_return_t
- ds_device_map (device_t dev, vm_prot_t prot, vm_offset_t offset,
- vm_size_t size, ipc_port_t *pager, boolean_t unmap)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->map)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->map) (dev->emul_data, prot,
- offset, size, pager, unmap);
- }
- boolean_t
- ds_notify (mach_msg_header_t *msg)
- {
- if (msg->msgh_id == MACH_NOTIFY_NO_SENDERS)
- {
- device_t dev;
- mach_no_senders_notification_t *ns;
- ns = (mach_no_senders_notification_t *) msg;
- dev = dev_port_lookup((ipc_port_t) ns->not_header.msgh_remote_port);
- assert(dev);
- if (dev->emul_ops->no_senders)
- (*dev->emul_ops->no_senders) (ns);
- return TRUE;
- }
- printf ("ds_notify: strange notification %d\n", msg->msgh_id);
- return FALSE;
- }
- io_return_t
- ds_device_write_trap (device_t dev, dev_mode_t mode,
- recnum_t recnum, vm_offset_t data, vm_size_t count)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->write_trap)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->write_trap) (dev->emul_data,
- mode, recnum, data, count);
- }
- io_return_t
- ds_device_writev_trap (device_t dev, dev_mode_t mode,
- recnum_t recnum, io_buf_vec_t *iovec, vm_size_t count)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return D_NO_SUCH_DEVICE;
- if (! dev->emul_ops->writev_trap)
- return D_INVALID_OPERATION;
- return (*dev->emul_ops->writev_trap) (dev->emul_data,
- mode, recnum, iovec, count);
- }
- void
- device_reference (device_t dev)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return;
- if (dev->emul_ops->reference)
- (*dev->emul_ops->reference) (dev->emul_data);
- }
- void
- device_deallocate (device_t dev)
- {
- /* Refuse if device is dead or not completely open. */
- if (dev == DEVICE_NULL)
- return;
- if (dev->emul_ops->dealloc)
- (*dev->emul_ops->dealloc) (dev->emul_data);
- }
- /*
- * What follows is the interface for the native Mach devices.
- */
- ipc_port_t
- mach_convert_device_to_port (mach_device_t device)
- {
- ipc_port_t port;
- if (! device)
- return IP_NULL;
- device_lock(device);
- if (device->state == DEV_STATE_OPEN)
- port = ipc_port_make_send(device->port);
- else
- port = IP_NULL;
- device_unlock(device);
- mach_device_deallocate(device);
- return port;
- }
- static io_return_t
- device_open(const ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode,
- char * name,
- device_t *device_p)
- {
- mach_device_t device;
- kern_return_t result;
- io_req_t ior;
- ipc_port_t notify;
- /*
- * Find the device.
- */
- device = device_lookup(name);
- if (device == MACH_DEVICE_NULL)
- return (D_NO_SUCH_DEVICE);
- /*
- * If the device is being opened or closed,
- * wait for that operation to finish.
- */
- device_lock(device);
- while (device->state == DEV_STATE_OPENING ||
- device->state == DEV_STATE_CLOSING) {
- device->io_wait = TRUE;
- thread_sleep((event_t)device, simple_lock_addr(device->lock), TRUE);
- device_lock(device);
- }
- /*
- * If the device is already open, increment the open count
- * and return.
- */
- if (device->state == DEV_STATE_OPEN) {
- if (device->flag & D_EXCL_OPEN) {
- /*
- * Cannot open a second time.
- */
- device_unlock(device);
- mach_device_deallocate(device);
- return (D_ALREADY_OPEN);
- }
- device->open_count++;
- device_unlock(device);
- *device_p = &device->dev;
- return (D_SUCCESS);
- /*
- * Return deallocates device reference while acquiring
- * port.
- */
- }
- /*
- * Allocate the device port and register the device before
- * opening it.
- */
- device->state = DEV_STATE_OPENING;
- device_unlock(device);
- /*
- * Allocate port, keeping a reference for it.
- */
- device->port = ipc_port_alloc_kernel();
- if (device->port == IP_NULL) {
- device_lock(device);
- device->state = DEV_STATE_INIT;
- device->port = IP_NULL;
- if (device->io_wait) {
- device->io_wait = FALSE;
- thread_wakeup((event_t)device);
- }
- device_unlock(device);
- mach_device_deallocate(device);
- return (KERN_RESOURCE_SHORTAGE);
- }
- dev_port_enter(device);
- /*
- * Request no-senders notifications on device port.
- */
- notify = ipc_port_make_sonce(device->port);
- ip_lock(device->port);
- ipc_port_nsrequest(device->port, 1, notify, ¬ify);
- assert(notify == IP_NULL);
- /*
- * Open the device.
- */
- io_req_alloc(ior, 0);
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_OPEN | IO_CALL;
- ior->io_mode = mode;
- ior->io_error = 0;
- ior->io_done = ds_open_done;
- ior->io_reply_port = reply_port;
- ior->io_reply_port_type = reply_port_type;
- result = (*device->dev_ops->d_open)(device->dev_number, (int)mode, ior);
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Return result via ds_open_done.
- */
- ior->io_error = result;
- (void) ds_open_done(ior);
- io_req_free(ior);
- return (MIG_NO_REPLY); /* reply already sent */
- }
- boolean_t
- ds_open_done(const io_req_t ior)
- {
- kern_return_t result;
- mach_device_t device;
- device = ior->io_device;
- result = ior->io_error;
- if (result != D_SUCCESS) {
- /*
- * Open failed. Deallocate port and device.
- */
- dev_port_remove(device);
- ipc_port_dealloc_kernel(device->port);
- device->port = IP_NULL;
- device_lock(device);
- device->state = DEV_STATE_INIT;
- if (device->io_wait) {
- device->io_wait = FALSE;
- thread_wakeup((event_t)device);
- }
- device_unlock(device);
- mach_device_deallocate(device);
- device = MACH_DEVICE_NULL;
- }
- else {
- /*
- * Open succeeded.
- */
- device_lock(device);
- device->state = DEV_STATE_OPEN;
- device->open_count = 1;
- if (device->io_wait) {
- device->io_wait = FALSE;
- thread_wakeup((event_t)device);
- }
- device_unlock(device);
- /* donate device reference to get port */
- }
- /*
- * Must explicitly convert device to port, since
- * device_reply interface is built as 'user' side
- * (thus cannot get translation).
- */
- if (IP_VALID(ior->io_reply_port)) {
- (void) ds_device_open_reply(ior->io_reply_port,
- ior->io_reply_port_type,
- result,
- mach_convert_device_to_port(device));
- } else
- mach_device_deallocate(device);
- return (TRUE);
- }
- static io_return_t
- device_close(void *dev)
- {
- mach_device_t device = dev;
- device_lock(device);
- /*
- * If device will remain open, do nothing.
- */
- if (--device->open_count > 0) {
- device_unlock(device);
- return (D_SUCCESS);
- }
- /*
- * If device is being closed, do nothing.
- */
- if (device->state == DEV_STATE_CLOSING) {
- device_unlock(device);
- return (D_SUCCESS);
- }
- /*
- * Mark device as closing, to prevent new IO.
- * Outstanding IO will still be in progress.
- */
- device->state = DEV_STATE_CLOSING;
- device_unlock(device);
- /*
- * ? wait for IO to end ?
- * only if device wants to
- */
- /*
- * Remove the device-port association.
- */
- dev_port_remove(device);
- ipc_port_dealloc_kernel(device->port);
- /*
- * Close the device
- */
- (*device->dev_ops->d_close)(device->dev_number, 0);
- /*
- * Finally mark it closed. If someone else is trying
- * to open it, the open can now proceed.
- */
- device_lock(device);
- device->state = DEV_STATE_INIT;
- if (device->io_wait) {
- device->io_wait = FALSE;
- thread_wakeup((event_t)device);
- }
- device_unlock(device);
- return (D_SUCCESS);
- }
- /*
- * Write to a device.
- */
- static io_return_t
- device_write(void *dev,
- const ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode,
- recnum_t recnum,
- const io_buf_ptr_t data,
- unsigned int data_count,
- int *bytes_written)
- {
- mach_device_t device = dev;
- io_req_t ior;
- io_return_t result;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /*
- * XXX Need logic to reject ridiculously big requests.
- */
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * Package the write request for the device driver
- */
- io_req_alloc(ior, data_count);
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_WRITE | IO_CALL;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = data;
- ior->io_count = data_count;
- ior->io_total = data_count;
- ior->io_alloc_size = 0;
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_write_done;
- ior->io_reply_port = reply_port;
- ior->io_reply_port_type = reply_port_type;
- ior->io_copy = VM_MAP_COPY_NULL;
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * And do the write ...
- *
- * device_write_dealoc returns false if there's more
- * to do; it has updated the ior appropriately and expects
- * its caller to reinvoke it on the device.
- */
- do {
- result = (*device->dev_ops->d_write)(device->dev_number, ior);
- /*
- * If the IO was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Discard the local mapping of the data.
- */
- } while (!device_write_dealloc(ior));
- /*
- * Return the number of bytes actually written.
- */
- *bytes_written = ior->io_total - ior->io_residual;
- /*
- * Remove the extra reference.
- */
- mach_device_deallocate(device);
- io_req_free(ior);
- return (result);
- }
- /*
- * Write to a device, but memory is in message.
- */
- static io_return_t
- device_write_inband(void *dev,
- const ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode,
- recnum_t recnum,
- io_buf_ptr_inband_t data,
- unsigned int data_count,
- int *bytes_written)
- {
- mach_device_t device = dev;
- io_req_t ior;
- io_return_t result;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * Package the write request for the device driver.
- */
- io_req_alloc(ior, 0);
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_WRITE | IO_CALL | IO_INBAND;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = data;
- ior->io_count = data_count;
- ior->io_total = data_count;
- ior->io_alloc_size = 0;
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_write_done;
- ior->io_reply_port = reply_port;
- ior->io_reply_port_type = reply_port_type;
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * And do the write.
- */
- result = (*device->dev_ops->d_write)(device->dev_number, ior);
- /*
- * If the IO was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Return the number of bytes actually written.
- */
- *bytes_written = ior->io_total - ior->io_residual;
- /*
- * Remove the extra reference.
- */
- mach_device_deallocate(device);
- io_req_free(ior);
- return (result);
- }
- /*
- * Wire down incoming memory to give to device.
- */
- kern_return_t
- device_write_get(
- io_req_t ior,
- boolean_t *wait)
- {
- vm_map_copy_t io_copy;
- vm_offset_t new_addr;
- kern_return_t result;
- int bsize;
- vm_size_t min_size;
- /*
- * By default, caller does not have to wait.
- */
- *wait = FALSE;
- /*
- * Nothing to do if no data.
- */
- if (ior->io_count == 0)
- return (KERN_SUCCESS);
- /*
- * Loaned iors already have valid data.
- */
- if (ior->io_op & IO_LOANED)
- return (KERN_SUCCESS);
- /*
- * Inband case.
- */
- if (ior->io_op & IO_INBAND) {
- assert(ior->io_count <= sizeof (io_buf_ptr_inband_t));
- new_addr = kmem_cache_alloc(&io_inband_cache);
- memcpy((void*)new_addr, ior->io_data, ior->io_count);
- ior->io_data = (io_buf_ptr_t)new_addr;
- ior->io_alloc_size = sizeof (io_buf_ptr_inband_t);
- return (KERN_SUCCESS);
- }
- /*
- * Figure out how much data to move this time. If the device
- * won't return a block size, then we have to do the whole
- * request in one shot (ditto if this is a block fragment),
- * otherwise, move at least one block's worth.
- */
- result = (*ior->io_device->dev_ops->d_dev_info)(
- ior->io_device->dev_number,
- D_INFO_BLOCK_SIZE,
- &bsize);
- if (result != KERN_SUCCESS || ior->io_count < (vm_size_t) bsize)
- min_size = (vm_size_t) ior->io_count;
- else
- min_size = (vm_size_t) bsize;
- /*
- * Map the pages from this page list into memory.
- * io_data records location of data.
- * io_alloc_size is the vm size of the region to deallocate.
- */
- io_copy = (vm_map_copy_t) ior->io_data;
- result = kmem_io_map_copyout(device_io_map,
- (vm_offset_t*)&ior->io_data, &new_addr,
- &ior->io_alloc_size, io_copy, min_size);
- if (result != KERN_SUCCESS)
- return (result);
- if ((ior->io_data + ior->io_count) >
- (((char *)new_addr) + ior->io_alloc_size)) {
- /*
- * Operation has to be split. Reset io_count for how
- * much we can do this time.
- */
- assert(vm_map_copy_has_cont(io_copy));
- assert(ior->io_count == io_copy->size);
- ior->io_count = ior->io_alloc_size -
- (ior->io_data - ((char *)new_addr));
- /*
- * Caller must wait synchronously.
- */
- ior->io_op &= ~IO_CALL;
- *wait = TRUE;
- }
- ior->io_copy = io_copy; /* vm_map_copy to discard */
- return (KERN_SUCCESS);
- }
- /*
- * Clean up memory allocated for IO.
- */
- boolean_t
- device_write_dealloc(io_req_t ior)
- {
- vm_map_copy_t new_copy = VM_MAP_COPY_NULL;
- vm_map_copy_t io_copy;
- kern_return_t result;
- vm_offset_t size_to_do;
- int bsize;
- if (ior->io_alloc_size == 0)
- return (TRUE);
- /*
- * Inband case.
- */
- if (ior->io_op & IO_INBAND) {
- kmem_cache_free(&io_inband_cache, (vm_offset_t)ior->io_data);
- return (TRUE);
- }
- if ((io_copy = ior->io_copy) == VM_MAP_COPY_NULL)
- return (TRUE);
- /*
- * To prevent a possible deadlock with the default pager,
- * we have to release space in the device_io_map before
- * we allocate any memory. (Which vm_map_copy_invoke_cont
- * might do.) See the discussion in mach_device_init.
- */
- kmem_io_map_deallocate(device_io_map,
- trunc_page(ior->io_data),
- ior->io_alloc_size);
- if (vm_map_copy_has_cont(io_copy)) {
- /*
- * Remember how much is left, then
- * invoke or abort the continuation.
- */
- size_to_do = io_copy->size - ior->io_count;
- if (ior->io_error == 0) {
- vm_map_copy_invoke_cont(io_copy, &new_copy, &result);
- }
- else {
- vm_map_copy_abort_cont(io_copy);
- result = KERN_FAILURE;
- }
- if (result == KERN_SUCCESS && new_copy != VM_MAP_COPY_NULL) {
- int res;
- /*
- * We have a new continuation, reset the ior to
- * represent the remainder of the request. Must
- * adjust the recnum because drivers assume
- * that the residual is zero.
- */
- ior->io_op &= ~IO_DONE;
- ior->io_op |= IO_CALL;
- res = (*ior->io_device->dev_ops->d_dev_info)(
- ior->io_device->dev_number,
- D_INFO_BLOCK_SIZE,
- &bsize);
- if (res != D_SUCCESS)
- panic("device_write_dealloc: No block size");
- ior->io_recnum += ior->io_count/bsize;
- ior->io_count = new_copy->size;
- }
- else {
- /*
- * No continuation. Add amount we didn't get
- * to into residual.
- */
- ior->io_residual += size_to_do;
- }
- }
- /*
- * Clean up the state for the IO that just completed.
- */
- vm_map_copy_discard(ior->io_copy);
- ior->io_copy = VM_MAP_COPY_NULL;
- ior->io_data = (char *) new_copy;
- /*
- * Return FALSE if there's more IO to do.
- */
- return(new_copy == VM_MAP_COPY_NULL);
- }
- /*
- * Send write completion message to client, and discard the data.
- */
- boolean_t
- ds_write_done(const io_req_t ior)
- {
- /*
- * device_write_dealloc discards the data that has been
- * written, but may decide that there is more to write.
- */
- while (!device_write_dealloc(ior)) {
- io_return_t result;
- mach_device_t device;
- /*
- * More IO to do -- invoke it.
- */
- device = ior->io_device;
- result = (*device->dev_ops->d_write)(device->dev_number, ior);
- /*
- * If the IO was queued, return FALSE -- not done yet.
- */
- if (result == D_IO_QUEUED)
- return (FALSE);
- }
- /*
- * Now the write is really complete. Send reply.
- */
- if (IP_VALID(ior->io_reply_port)) {
- (void) (*((ior->io_op & IO_INBAND) ?
- ds_device_write_reply_inband :
- ds_device_write_reply))(ior->io_reply_port,
- ior->io_reply_port_type,
- ior->io_error,
- (int) (ior->io_total -
- ior->io_residual));
- }
- mach_device_deallocate(ior->io_device);
- return (TRUE);
- }
- /*
- * Read from a device.
- */
- static io_return_t
- device_read(void *dev,
- const ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode,
- recnum_t recnum,
- int bytes_wanted,
- io_buf_ptr_t *data,
- unsigned int *data_count)
- {
- mach_device_t device = dev;
- io_req_t ior;
- io_return_t result;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * There must be a reply port.
- */
- if (!IP_VALID(reply_port)) {
- printf("ds_* invalid reply port\n");
- SoftDebugger("ds_* reply_port");
- return (MIG_NO_REPLY); /* no sense in doing anything */
- }
- /*
- * Package the read request for the device driver
- */
- io_req_alloc(ior, 0);
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_READ | IO_CALL;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = 0; /* driver must allocate data */
- ior->io_count = bytes_wanted;
- ior->io_alloc_size = 0; /* no data allocated yet */
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_read_done;
- ior->io_reply_port = reply_port;
- ior->io_reply_port_type = reply_port_type;
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * And do the read.
- */
- result = (*device->dev_ops->d_read)(device->dev_number, ior);
- /*
- * If the IO was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Return result via ds_read_done.
- */
- ior->io_error = result;
- (void) ds_read_done(ior);
- io_req_free(ior);
- return (MIG_NO_REPLY); /* reply has already been sent. */
- }
- /*
- * Read from a device, but return the data 'inband.'
- */
- static io_return_t
- device_read_inband(void *dev,
- const ipc_port_t reply_port,
- mach_msg_type_name_t reply_port_type,
- dev_mode_t mode,
- recnum_t recnum,
- int bytes_wanted,
- char *data,
- unsigned int *data_count)
- {
- mach_device_t device = dev;
- io_req_t ior;
- io_return_t result;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * There must be a reply port.
- */
- if (!IP_VALID(reply_port)) {
- printf("ds_* invalid reply port\n");
- SoftDebugger("ds_* reply_port");
- return (MIG_NO_REPLY); /* no sense in doing anything */
- }
- /*
- * Package the read for the device driver
- */
- io_req_alloc(ior, 0);
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_READ | IO_CALL | IO_INBAND;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = 0; /* driver must allocate data */
- ior->io_count =
- ((bytes_wanted < sizeof(io_buf_ptr_inband_t)) ?
- bytes_wanted : sizeof(io_buf_ptr_inband_t));
- ior->io_alloc_size = 0; /* no data allocated yet */
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_read_done;
- ior->io_reply_port = reply_port;
- ior->io_reply_port_type = reply_port_type;
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * Do the read.
- */
- result = (*device->dev_ops->d_read)(device->dev_number, ior);
- /*
- * If the io was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Return result, via ds_read_done.
- */
- ior->io_error = result;
- (void) ds_read_done(ior);
- io_req_free(ior);
- return (MIG_NO_REPLY); /* reply has already been sent. */
- }
- /*
- * Allocate wired-down memory for device read.
- */
- kern_return_t device_read_alloc(
- io_req_t ior,
- vm_size_t size)
- {
- vm_offset_t addr;
- kern_return_t kr;
- /*
- * Nothing to do if no data.
- */
- if (ior->io_count == 0)
- return (KERN_SUCCESS);
- if (ior->io_op & IO_INBAND) {
- ior->io_data = (io_buf_ptr_t) kmem_cache_alloc(&io_inband_cache);
- ior->io_alloc_size = sizeof(io_buf_ptr_inband_t);
- } else {
- size = round_page(size);
- kr = kmem_alloc(kernel_map, &addr, size);
- if (kr != KERN_SUCCESS)
- return (kr);
- ior->io_data = (io_buf_ptr_t) addr;
- ior->io_alloc_size = size;
- }
- return (KERN_SUCCESS);
- }
- boolean_t ds_read_done(const io_req_t ior)
- {
- vm_offset_t start_data, end_data;
- vm_offset_t start_sent, end_sent;
- vm_size_t size_read;
- if (ior->io_error)
- size_read = 0;
- else
- size_read = ior->io_count - ior->io_residual;
- start_data = (vm_offset_t)ior->io_data;
- end_data = start_data + size_read;
- start_sent = (ior->io_op & IO_INBAND) ? start_data :
- trunc_page(start_data);
- end_sent = (ior->io_op & IO_INBAND) ?
- start_data + ior->io_alloc_size : round_page(end_data);
- /*
- * Zero memory that the device did not fill.
- */
- if (start_sent < start_data)
- memset((void *)start_sent, 0, start_data - start_sent);
- if (end_sent > end_data)
- memset((void *)end_data, 0, end_sent - end_data);
- /*
- * Touch the data being returned, to mark it dirty.
- * If the pages were filled by DMA, the pmap module
- * may think that they are clean.
- */
- {
- vm_offset_t touch;
- int c;
- for (touch = start_sent; touch < end_sent; touch += PAGE_SIZE) {
- c = *(volatile char *)touch;
- *(volatile char *)touch = c;
- }
- }
- /*
- * Send the data to the reply port - this
- * unwires and deallocates it.
- */
- if (ior->io_op & IO_INBAND) {
- (void)ds_device_read_reply_inband(ior->io_reply_port,
- ior->io_reply_port_type,
- ior->io_error,
- (char *) start_data,
- size_read);
- } else {
- vm_map_copy_t copy;
- kern_return_t kr;
- kr = vm_map_copyin_page_list(kernel_map, start_data,
- size_read, TRUE, TRUE,
- ©, FALSE);
- if (kr != KERN_SUCCESS)
- panic("read_done: vm_map_copyin_page_list failed");
- (void)ds_device_read_reply(ior->io_reply_port,
- ior->io_reply_port_type,
- ior->io_error,
- (char *) copy,
- size_read);
- }
- /*
- * Free any memory that was allocated but not sent.
- */
- if (ior->io_count != 0) {
- if (ior->io_op & IO_INBAND) {
- if (ior->io_alloc_size > 0)
- kmem_cache_free(&io_inband_cache, (vm_offset_t)ior->io_data);
- } else {
- vm_offset_t end_alloc;
- end_alloc = start_sent + round_page(ior->io_alloc_size);
- if (end_alloc > end_sent)
- (void) vm_deallocate(kernel_map,
- end_sent,
- end_alloc - end_sent);
- }
- }
- mach_device_deallocate(ior->io_device);
- return (TRUE);
- }
- static io_return_t
- device_set_status(
- void *dev,
- dev_flavor_t flavor,
- dev_status_t status,
- mach_msg_type_number_t status_count)
- {
- mach_device_t device = dev;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- return ((*device->dev_ops->d_setstat)(device->dev_number,
- flavor,
- status,
- status_count));
- }
- io_return_t
- mach_device_get_status(
- void *dev,
- dev_flavor_t flavor,
- dev_status_t status, /* pointer to OUT array */
- mach_msg_type_number_t *status_count) /* out */
- {
- mach_device_t device = dev;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- return ((*device->dev_ops->d_getstat)(device->dev_number,
- flavor,
- status,
- status_count));
- }
- static io_return_t
- device_set_filter(void *dev,
- const ipc_port_t receive_port,
- int priority,
- filter_t filter[],
- unsigned int filter_count)
- {
- mach_device_t device = dev;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * Request is absurd if no receive port is specified.
- */
- if (!IP_VALID(receive_port))
- return (D_INVALID_OPERATION);
- return ((*device->dev_ops->d_async_in)(device->dev_number,
- receive_port,
- priority,
- filter,
- filter_count));
- }
- static io_return_t
- device_map(
- void *dev,
- vm_prot_t protection,
- vm_offset_t offset,
- vm_size_t size,
- ipc_port_t *pager, /* out */
- boolean_t unmap) /* ? */
- {
- mach_device_t device = dev;
- if (protection & ~VM_PROT_ALL)
- return (KERN_INVALID_ARGUMENT);
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- return (device_pager_setup(device, protection, offset, size,
- (mach_port_t*)pager));
- }
- /*
- * Doesn't do anything (yet).
- */
- static void
- ds_no_senders(mach_no_senders_notification_t *notification)
- {
- printf("ds_no_senders called! device_port=0x%lx count=%d\n",
- notification->not_header.msgh_remote_port,
- notification->not_count);
- }
- queue_head_t io_done_list;
- decl_simple_lock_data(, io_done_list_lock)
- #define splio splsched /* XXX must block ALL io devices */
- void iodone(io_req_t ior)
- {
- spl_t s;
- /*
- * If this ior was loaned to us, return it directly.
- */
- if (ior->io_op & IO_LOANED) {
- (*ior->io_done)(ior);
- return;
- }
- /*
- * If !IO_CALL, some thread is waiting for this. Must lock
- * structure to interlock correctly with iowait(). Else can
- * toss on queue for io_done thread to call completion.
- */
- s = splio();
- if ((ior->io_op & IO_CALL) == 0) {
- ior_lock(ior);
- ior->io_op |= IO_DONE;
- ior->io_op &= ~IO_WANTED;
- ior_unlock(ior);
- thread_wakeup((event_t)ior);
- } else {
- ior->io_op |= IO_DONE;
- simple_lock(&io_done_list_lock);
- enqueue_tail(&io_done_list, (queue_entry_t)ior);
- thread_wakeup((event_t)&io_done_list);
- simple_unlock(&io_done_list_lock);
- }
- splx(s);
- }
- void __attribute__ ((noreturn)) io_done_thread_continue(void)
- {
- for (;;) {
- spl_t s;
- io_req_t ior;
- #if defined (LINUX_DEV) && defined (CONFIG_INET)
- free_skbuffs ();
- #endif
- s = splio();
- simple_lock(&io_done_list_lock);
- while ((ior = (io_req_t)dequeue_head(&io_done_list)) != 0) {
- simple_unlock(&io_done_list_lock);
- (void) splx(s);
- if ((*ior->io_done)(ior)) {
- /*
- * IO done - free io_req_elt
- */
- io_req_free(ior);
- }
- /* else routine has re-queued it somewhere */
- s = splio();
- simple_lock(&io_done_list_lock);
- }
- assert_wait(&io_done_list, FALSE);
- simple_unlock(&io_done_list_lock);
- (void) splx(s);
- counter(c_io_done_thread_block++);
- thread_block(io_done_thread_continue);
- }
- }
- void io_done_thread(void)
- {
- /*
- * Set thread privileges and highest priority.
- */
- current_thread()->vm_privilege = 1;
- stack_privilege(current_thread());
- thread_set_own_priority(0);
- io_done_thread_continue();
- /*NOTREACHED*/
- }
- #define DEVICE_IO_MAP_SIZE (16 * 1024 * 1024)
- static void mach_device_trap_init(void); /* forward */
- void mach_device_init(void)
- {
- vm_offset_t device_io_min, device_io_max;
- queue_init(&io_done_list);
- simple_lock_init(&io_done_list_lock);
- kmem_submap(device_io_map, kernel_map, &device_io_min, &device_io_max,
- DEVICE_IO_MAP_SIZE);
- /*
- * If the kernel receives many device_write requests, the
- * device_io_map might run out of space. To prevent
- * device_write_get from failing in this case, we enable
- * wait_for_space on the map. This causes kmem_io_map_copyout
- * to block until there is sufficient space.
- * (XXX Large writes may be starved by small writes.)
- *
- * There is a potential deadlock problem with this solution,
- * if a device_write from the default pager has to wait
- * for the completion of a device_write which needs to wait
- * for memory allocation. Hence, once device_write_get
- * allocates space in device_io_map, no blocking memory
- * allocations should happen until device_write_dealloc
- * frees the space. (XXX A large write might starve
- * a small write from the default pager.)
- */
- device_io_map->wait_for_space = TRUE;
- kmem_cache_init(&io_inband_cache, "io_buf_ptr_inband",
- sizeof(io_buf_ptr_inband_t), 0, NULL, 0);
- mach_device_trap_init();
- }
- void iowait(io_req_t ior)
- {
- spl_t s;
- s = splio();
- ior_lock(ior);
- while ((ior->io_op&IO_DONE)==0) {
- assert_wait((event_t)ior, FALSE);
- ior_unlock(ior);
- thread_block((void (*)()) 0);
- ior_lock(ior);
- }
- ior_unlock(ior);
- splx(s);
- }
- /*
- * Device trap support.
- */
- /*
- * Memory Management
- *
- * This currently has a single pool of 2k wired buffers
- * since we only handle writes to an ethernet device.
- * Should be more general.
- */
- #define IOTRAP_REQSIZE 2048
- struct kmem_cache io_trap_cache;
- /*
- * Initialization. Called from mach_device_init().
- */
- static void
- mach_device_trap_init(void)
- {
- kmem_cache_init(&io_trap_cache, "io_req", IOTRAP_REQSIZE, 0,
- NULL, 0);
- }
- /*
- * Allocate an io_req_t.
- * Currently allocates from io_trap_cache.
- *
- * Could have lists of different size caches.
- * Could call a device-specific routine.
- */
- io_req_t
- ds_trap_req_alloc(const mach_device_t device, vm_size_t data_size)
- {
- return (io_req_t) kmem_cache_alloc(&io_trap_cache);
- }
- /*
- * Called by iodone to release ior.
- */
- boolean_t
- ds_trap_write_done(const io_req_t ior)
- {
- mach_device_t dev;
- dev = ior->io_device;
- /*
- * Should look at reply port and maybe send a message.
- */
- kmem_cache_free(&io_trap_cache, (vm_offset_t) ior);
- /*
- * Give up device reference from ds_write_trap.
- */
- mach_device_deallocate(dev);
- return TRUE;
- }
- /*
- * Like device_write except that data is in user space.
- */
- static io_return_t
- device_write_trap (mach_device_t device, dev_mode_t mode,
- recnum_t recnum, vm_offset_t data, vm_size_t data_count)
- {
- io_req_t ior;
- io_return_t result;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * Get a buffer to hold the ioreq.
- */
- ior = ds_trap_req_alloc(device, data_count);
- /*
- * Package the write request for the device driver.
- */
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_WRITE | IO_CALL | IO_LOANED;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = (io_buf_ptr_t)
- (vm_offset_t)ior + sizeof(struct io_req);
- ior->io_count = data_count;
- ior->io_total = data_count;
- ior->io_alloc_size = 0;
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_trap_write_done;
- ior->io_reply_port = IP_NULL; /* XXX */
- ior->io_reply_port_type = 0; /* XXX */
- /*
- * Copy the data from user space.
- */
- if (data_count > 0)
- copyin((void *)data, ior->io_data, data_count);
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * And do the write.
- */
- result = (*device->dev_ops->d_write)(device->dev_number, ior);
- /*
- * If the IO was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Remove the extra reference.
- */
- mach_device_deallocate(device);
- kmem_cache_free(&io_trap_cache, (vm_offset_t) ior);
- return (result);
- }
- static io_return_t
- device_writev_trap (mach_device_t device, dev_mode_t mode,
- recnum_t recnum, io_buf_vec_t *iovec, vm_size_t iocount)
- {
- io_req_t ior;
- io_return_t result;
- io_buf_vec_t stack_iovec[16]; /* XXX */
- vm_size_t data_count;
- unsigned i;
- if (device->state != DEV_STATE_OPEN)
- return (D_NO_SUCH_DEVICE);
- /* XXX note that a CLOSE may proceed at any point */
- /*
- * Copyin user addresses.
- */
- if (iocount > 16)
- return KERN_INVALID_VALUE; /* lame */
- copyin(iovec,
- stack_iovec,
- iocount * sizeof(io_buf_vec_t));
- for (data_count = 0, i = 0; i < iocount; i++)
- data_count += stack_iovec[i].count;
- /*
- * Get a buffer to hold the ioreq.
- */
- ior = ds_trap_req_alloc(device, data_count);
- /*
- * Package the write request for the device driver.
- */
- ior->io_device = device;
- ior->io_unit = device->dev_number;
- ior->io_op = IO_WRITE | IO_CALL | IO_LOANED;
- ior->io_mode = mode;
- ior->io_recnum = recnum;
- ior->io_data = (io_buf_ptr_t)
- (vm_offset_t)ior + sizeof(struct io_req);
- ior->io_count = data_count;
- ior->io_total = data_count;
- ior->io_alloc_size = 0;
- ior->io_residual = 0;
- ior->io_error = 0;
- ior->io_done = ds_trap_write_done;
- ior->io_reply_port = IP_NULL; /* XXX */
- ior->io_reply_port_type = 0; /* XXX */
- /*
- * Copy the data from user space.
- */
- if (data_count > 0) {
- vm_offset_t p;
- p = (vm_offset_t) ior->io_data;
- for (i = 0; i < iocount; i++) {
- copyin((void *) stack_iovec[i].data,
- (void *) p,
- stack_iovec[i].count);
- p += stack_iovec[i].count;
- }
- }
- /*
- * The ior keeps an extra reference for the device.
- */
- mach_device_reference(device);
- /*
- * And do the write.
- */
- result = (*device->dev_ops->d_write)(device->dev_number, ior);
- /*
- * If the IO was queued, delay reply until it is finished.
- */
- if (result == D_IO_QUEUED)
- return (MIG_NO_REPLY);
- /*
- * Remove the extra reference.
- */
- mach_device_deallocate(device);
- kmem_cache_free(&io_trap_cache, (vm_offset_t) ior);
- return (result);
- }
- struct device_emulation_ops mach_device_emulation_ops =
- {
- (void*) mach_device_reference,
- (void*) mach_device_deallocate,
- (void*) mach_convert_device_to_port,
- device_open,
- device_close,
- device_write,
- device_write_inband,
- device_read,
- device_read_inband,
- device_set_status,
- mach_device_get_status,
- device_set_filter,
- device_map,
- ds_no_senders,
- (void*) device_write_trap,
- (void*) device_writev_trap
- };
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