7cd468a3d7
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* Copyright (c) 2015 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* physmem.h: virtual <-> physical memory mapping for VLIB buffers
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*
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* Copyright (c) 2008 Eliot Dresselhaus
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef included_vlib_physmem_h
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#define included_vlib_physmem_h
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typedef struct
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{
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uword start, end, size;
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} vlib_physmem_region_t;
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typedef struct
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{
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vlib_physmem_region_t virtual;
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uword log2_n_bytes_per_page;
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/* 1 << log2_n_bytes_per_page - 1. */
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uword page_mask;
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u64 *page_table;
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/* is fake physmem */
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u8 is_fake;
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} vlib_physmem_main_t;
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always_inline u64
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vlib_physmem_offset_to_physical (vlib_physmem_main_t * pm, uword o)
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{
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uword page_index = o >> pm->log2_n_bytes_per_page;
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ASSERT (o < pm->virtual.size);
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ASSERT (pm->page_table[page_index] != 0);
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return (vec_elt (pm->page_table, page_index) + (o & pm->page_mask));
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}
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always_inline int
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vlib_physmem_is_virtual (vlib_physmem_main_t * pm, uword p)
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{
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return p >= pm->virtual.start && p < pm->virtual.end;
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}
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always_inline uword
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vlib_physmem_offset_of (vlib_physmem_main_t * pm, void *p)
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{
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uword a = pointer_to_uword (p);
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uword o;
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ASSERT (vlib_physmem_is_virtual (pm, a));
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o = a - pm->virtual.start;
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/* Offset must fit in 32 bits. */
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ASSERT ((uword) o == a - pm->virtual.start);
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return o;
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}
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always_inline void *
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vlib_physmem_at_offset (vlib_physmem_main_t * pm, uword offset)
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{
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ASSERT (offset < pm->virtual.size);
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return uword_to_pointer (pm->virtual.start + offset, void *);
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}
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#endif /* included_vlib_physmem_h */
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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