Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
#include <sys/ddi.h> #include <sys/sunddi.h> int devmap_devmem_setup(devmap_cookie_t dhp, dev_info_t *dip, struct devmap_callback_ctl *callbackops, uint_t rnumber, offset_t roff, size_t len, uint_t maxprot, uint_t flags, ddi_device_acc_attr_t *accattrp);
int devmap_umem_setup(devmap_cookie_t dhp, dev_info_t *dip, struct devmap_callback_ctl *callbackops, ddi_umem_cookie_t cookie, offset_t koff, size_t len, uint_t maxprot, uint_t flags, ddi_device_acc_attr_t *accattrp);
Solaris DDI specific (Solaris DDI).
devmap_devmem_setup() parameters:
dhp
An opaque mapping handle that the system uses to describe the mapping.
dip
Pointer to the device's dev_info structure.
callbackops
Pointer to a devmap_callback_ctl(9S) structure. The structure contains pointers to device driver-supplied functions that manage events on the device mapping. The framework will copy the structure to the system private memory.
rnumber
Index number to the register address space set.
roff
Offset into the register address space.
len
Length (in bytes) of the mapping to be mapped.
maxprot
Maximum protection flag possible for attempted mapping. Some combinations of possible settings are:
PROT_READ
Read access is allowed.
PROT_WRITE
Write access is allowed.
PROT_EXEC
Execute access is allowed.
PROT_USER
User-level access is allowed. The mapping is done as a result of a mmap(2) system call.
PROT_ALL
All access is allowed.
flags
Used to determine the cache attribute. Possible values of the cache attribute are:
IOMEM_DATA_CACHED
The CPU can cache the data it fetches and push it to memory at a later time. This is the default attribute that is used if no cache attributes are specified.
IOMEM_DATA_UC_WR_COMBINE
The CPU never caches the data, but writes can occur out of order or can be combined. Reordering is implied. If IOMEM_DATA_UC_WR_COMBINE is specified but not supported, IOMEM_DATA_UNCACHED is used instead.
IOMEM_DATA_UNCACHED
The CPU never caches data, but has uncacheable access to memory. Strict ordering is implied.
accattrp
Pointer to a ddi_device_acc_attr() structure of the device. See ddi_device_acc_attr(9S). The value in devacc_attr_dataorder is ignored in the current release. The value in devacc_attr_endian_flags is meaningful on the SPARC architecture only.
devmap_umem_setup() parameters:
dhp
An opaque data structure that the system uses to describe the mapping.
dip
Pointer to the device's dev_info structure.
callbackops
Pointer to a devmap_callback_ctl(9S) structure. The structure contains pointers to device driver-supplied functions that manage events on the device mapping.
cookie
A kernel memory cookie (see ddi_umem_alloc(9F)).
koff
Offset into the kernel memory defined by cookie.
len
Length (in bytes) of the mapping to be mapped.
maxprot
Maximum protection flag possible for attempted mapping. Some combinations of possible settings are:
PROT_READ
Read access is allowed.
PROT_WRITE
Write access is allowed.
PROT_EXEC
Execute access is allowed.
PROT_USER
User-level access is allowed (the mapping is being done as a result of a mmap(2) system call).
PROT_ALL
All access is allowed.
flags
Must be set to 0.
accattrp
Pointer to a ddi_device_acc_attr(9S) structure. Ignored in the current release. Reserved for future use.
The devmap_devmem_setup() and devmap_umem_setup() functions are used in the devmap(9E) entry point to pass mapping parameters from the driver to the system.
The dhp argument specifies a device mapping handle that the system uses to store all mapping parameters of a physical contiguous memory. The system copies the data pointed to by callbackops to a system private memory. This allows the driver to free the data after returning from either devmap_devmem_setup() or devmap_umem_setup(). The driver is notified of user events on the mappings via the entry points defined by devmap_callback_ctl(9S). The driver is notified of the following user events:
Mapping Setup
User has called mmap(2) to create a mapping to the device memory.
Access
User has accessed an address in the mapping that has no translations.
Duplication
User has duplicated the mapping. Mappings are duplicated when the process calls fork(2).
Unmapping
User has called munmap(2) on the mapping or is exiting, exit(2).
See devmap_map(9E), devmap_access(9E), devmap_dup(9E), and devmap_unmap(9E) for details on these entry points.
By specifying a valid callbackops to the system, device drivers can manage events on a device mapping. For example, the devmap_access(9E) entry point allows the drivers to perform context switching by unloading the mappings of other processes and to load the mapping of the calling process. Device drivers may specify NULL to callbackops which means the drivers do not want to be notified by the system.
The maximum protection allowed for the mapping is specified in maxprot. accattrp defines the device access attributes. See ddi_device_acc_attr(9S) for more details.
devmap_devmem_setup() is used for device memory to map in the register set given by rnumber and the offset into the register address space given by roff. The system uses rnumber and roff to go up the device tree to get the physical address that corresponds to roff. The range to be affected is defined by len and roff. The range from roff to roff + len must be a physical contiguous memory and page aligned.
Drivers use devmap_umem_setup() for kernel memory to map in the kernel memory described by cookie and the offset into the kernel memory space given by koff. cookie is a kernel memory pointer obtained from ddi_umem_alloc(9F). If cookie is NULL, devmap_umem_setup() returns -1. The range to be affected is defined by len and koff. The range from koff to koff + len must be within the limits of the kernel memory described by koff + len and must be page aligned.
Drivers use devmap_umem_setup() to export the kernel memory allocated by ddi_umem_alloc(9F) to user space. The system selects a user virtual address that is aligned with the kernel virtual address being mapped to avoid cache incoherence if the mapping is not MAP_FIXED.
0
Successful completion.
-1
An error occurred.
devmap_devmem_setup() and devmap_umem_setup() can be called from user, kernel, and interrupt context.
exit(2), fork(2), mmap(2), munmap(2), devmap(9E), ddi_umem_alloc(9F), ddi_device_acc_attr(9S), devmap_callback_ctl(9S)
Writing Device Drivers