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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_funcs_h
#define included_vlib_physmem_funcs_h
always_inline vlib_physmem_region_t *
vlib_physmem_get_region (vlib_main_t * vm, u8 index)
{
vlib_physmem_main_t *vpm = &vm->physmem_main;
return pool_elt_at_index (vpm->regions, index);
}
always_inline u64
vlib_physmem_offset_to_physical (vlib_main_t * vm,
vlib_physmem_region_index_t idx, uword o)
{
vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
uword page_index = o >> pr->log2_page_size;
ASSERT (o < pr->size);
ASSERT (pr->page_table[page_index] != 0);
return (vec_elt (pr->page_table, page_index) + (o & pr->page_mask));
}
always_inline int
vlib_physmem_is_virtual (vlib_main_t * vm, vlib_physmem_region_index_t idx,
uword p)
{
vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
return p >= pointer_to_uword (pr->mem)
&& p < (pointer_to_uword (pr->mem) + pr->size);
}
always_inline uword
vlib_physmem_offset_of (vlib_main_t * vm, vlib_physmem_region_index_t idx,
void *p)
{
vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
uword a = pointer_to_uword (p);
uword o;
ASSERT (vlib_physmem_is_virtual (vm, idx, a));
o = a - pointer_to_uword (pr->mem);
/* Offset must fit in 32 bits. */
ASSERT ((uword) o == a - pointer_to_uword (pr->mem));
return o;
}
always_inline void *
vlib_physmem_at_offset (vlib_main_t * vm, vlib_physmem_region_index_t idx,
uword offset)
{
vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
ASSERT (offset < pr->size);
return uword_to_pointer (pointer_to_uword (pr->mem) + offset, void *);
}
always_inline void *
vlib_physmem_alloc_aligned (vlib_main_t * vm, vlib_physmem_region_index_t idx,
clib_error_t ** error,
uword n_bytes, uword alignment)
{
void *r = vm->os_physmem_alloc_aligned (vm, idx, n_bytes, alignment);
if (!r)
*error =
clib_error_return (0, "failed to allocate %wd bytes of I/O memory",
n_bytes);
else
*error = 0;
return r;
}
/* By default allocate I/O memory with cache line alignment. */
always_inline void *
vlib_physmem_alloc (vlib_main_t * vm, vlib_physmem_region_index_t idx,
clib_error_t ** error, uword n_bytes)
{
return vlib_physmem_alloc_aligned (vm, idx, error, n_bytes,
CLIB_CACHE_LINE_BYTES);
}
always_inline void
vlib_physmem_free (vlib_main_t * vm, vlib_physmem_region_index_t idx,
void *mem)
{
if (mem)
vm->os_physmem_free (vm, idx, mem);
}
always_inline u64
vlib_physmem_virtual_to_physical (vlib_main_t * vm,
vlib_physmem_region_index_t idx, void *mem)
{
vlib_physmem_main_t *vpm = &vm->physmem_main;
vlib_physmem_region_t *pr = pool_elt_at_index (vpm->regions, idx);
uword o = mem - pr->mem;
return vlib_physmem_offset_to_physical (vm, idx, o);
}
always_inline clib_error_t *
vlib_physmem_region_alloc (vlib_main_t * vm, char *name, u32 size,
u8 numa_node, u32 flags,
vlib_physmem_region_index_t * idx)
{
return vm->os_physmem_region_alloc (vm, name, size, numa_node, flags, idx);
}
always_inline void
vlib_physmem_region_free (struct vlib_main_t *vm,
vlib_physmem_region_index_t idx)
{
vm->os_physmem_region_free (vm, idx);
}
#endif /* included_vlib_physmem_funcs_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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