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