diff options
author | Ed Warnicke <eaw@cisco.com> | 2015-12-08 15:45:58 -0700 |
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committer | Ed Warnicke <eaw@cisco.com> | 2015-12-08 15:47:27 -0700 |
commit | cb9cadad578297ffd78fa8a33670bdf1ab669e7e (patch) | |
tree | 6ac2be912482cc7849a26f0ab845561c3d7f4e26 /vlib/vlib/physmem.h | |
parent | fb0815d4ae4bb0fe27bd9313f34b45c8593b907e (diff) |
Initial commit of vpp code.v1.0.0
Change-Id: Ib246f1fbfce93274020ee93ce461e3d8bd8b9f17
Signed-off-by: Ed Warnicke <eaw@cisco.com>
Diffstat (limited to 'vlib/vlib/physmem.h')
-rw-r--r-- | vlib/vlib/physmem.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/vlib/vlib/physmem.h b/vlib/vlib/physmem.h new file mode 100644 index 00000000000..6e70291c1d9 --- /dev/null +++ b/vlib/vlib/physmem.h @@ -0,0 +1,93 @@ +/* + * 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; +} 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 */ |