diff options
Diffstat (limited to 'sys/dev/isci/scil/sci_base_memory_descriptor_list.c')
| -rw-r--r-- | sys/dev/isci/scil/sci_base_memory_descriptor_list.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/dev/isci/scil/sci_base_memory_descriptor_list.c b/sys/dev/isci/scil/sci_base_memory_descriptor_list.c new file mode 100644 index 0000000..d470b8f --- /dev/null +++ b/sys/dev/isci/scil/sci_base_memory_descriptor_list.c @@ -0,0 +1,168 @@ +/*- + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * The full GNU General Public License is included in this distribution + * in the file called LICENSE.GPL. + * + * BSD LICENSE + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/** + * @file + * + * @brief This file contains the base implementation for the memory + * descriptor list. This is currently comprised of MDL iterator + * methods. + */ + +#include <dev/isci/scil/sci_base_memory_descriptor_list.h> + +//****************************************************************************** +//* P U B L I C M E T H O D S +//****************************************************************************** + +void sci_mdl_first_entry( + SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T mdl +) +{ + SCI_BASE_MEMORY_DESCRIPTOR_LIST_T * base_mdl = (SCI_BASE_MEMORY_DESCRIPTOR_LIST_T*) mdl; + + base_mdl->next_index = 0; + + // If this MDL is managing another MDL, then recursively rewind that MDL + // object as well. + if (base_mdl->next_mdl != SCI_INVALID_HANDLE) + sci_mdl_first_entry(base_mdl->next_mdl); +} + +// --------------------------------------------------------------------------- + +void sci_mdl_next_entry( + SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T mdl +) +{ + SCI_BASE_MEMORY_DESCRIPTOR_LIST_T * base_mdl = (SCI_BASE_MEMORY_DESCRIPTOR_LIST_T*) mdl; + + // If there is at least one more entry left in the array, then change + // the next pointer to it. + if (base_mdl->next_index < base_mdl->length) + base_mdl->next_index++; + else if (base_mdl->next_index == base_mdl->length) + { + // This MDL has exhausted it's set of entries. If this MDL is managing + // another MDL, then start iterating through that MDL. + if (base_mdl->next_mdl != SCI_INVALID_HANDLE) + sci_mdl_next_entry(base_mdl->next_mdl); + } +} + +// --------------------------------------------------------------------------- + +SCI_PHYSICAL_MEMORY_DESCRIPTOR_T * sci_mdl_get_current_entry( + SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T mdl +) +{ + SCI_BASE_MEMORY_DESCRIPTOR_LIST_T * base_mdl = (SCI_BASE_MEMORY_DESCRIPTOR_LIST_T*) mdl; + + if (base_mdl->next_index < base_mdl->length) + return & base_mdl->mde_array[base_mdl->next_index]; + else if (base_mdl->next_index == base_mdl->length) + { + // This MDL has exhausted it's set of entries. If this MDL is managing + // another MDL, then return it's current entry. + if (base_mdl->next_mdl != SCI_INVALID_HANDLE) + return sci_mdl_get_current_entry(base_mdl->next_mdl); + } + + return NULL; +} + +//****************************************************************************** +//* P R O T E C T E D M E T H O D S +//****************************************************************************** + +void sci_base_mdl_construct( + SCI_BASE_MEMORY_DESCRIPTOR_LIST_T * mdl, + SCI_PHYSICAL_MEMORY_DESCRIPTOR_T * mde_array, + U32 mde_array_length, + SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T next_mdl +) +{ + mdl->length = mde_array_length; + mdl->mde_array = mde_array; + mdl->next_index = 0; + mdl->next_mdl = next_mdl; +} + +// --------------------------------------------------------------------------- + +BOOL sci_base_mde_is_valid( + SCI_PHYSICAL_MEMORY_DESCRIPTOR_T * mde, + U32 alignment, + U32 size, + U16 attributes +) +{ + // Only need the lower 32 bits to ensure alignment is met. + U32 physical_address = sci_cb_physical_address_lower(mde->physical_address); + + if ( + ((physical_address & (alignment - 1)) != 0) + || (mde->constant_memory_alignment != alignment) + || (mde->constant_memory_size != size) + || (mde->virtual_address == NULL) + || (mde->constant_memory_attributes != attributes) + ) + { + return FALSE; + } + + return TRUE; +} + |
