115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
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/* Copyright (C) 2004 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include <sos/assert.h>
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#include <sos/macros.h>
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#include "physmem.h"
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#include "kmem_vmm.h"
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#include "kmem_slab.h"
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#include "kmalloc.h"
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/* The cache structures for these caches, the object size, their
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names, and some number of pages that contain them. They might not
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necessarily be powers of 2s. */
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static struct {
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const char *name;
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sos_size_t object_size;
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sos_count_t pages_per_slab;
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struct sos_kslab_cache *cache;
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} kmalloc_cache[] =
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{
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{ "kmalloc 8B objects", 8, 1 },
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{ "kmalloc 16B objects", 16, 1 },
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{ "kmalloc 32B objects", 32, 1 },
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{ "kmalloc 64B objects", 64, 1 },
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{ "kmalloc 128B objects", 128, 1 },
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{ "kmalloc 256B objects", 256, 2 },
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{ "kmalloc 1024B objects", 1024, 2 },
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{ "kmalloc 2048B objects", 2048, 3 },
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{ "kmalloc 4096B objects", 4096, 4 },
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{ "kmalloc 8192B objects", 8192, 8 },
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{ "kmalloc 16384B objects", 16384, 12 },
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{ NULL, 0, 0, NULL }
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};
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sos_ret_t sos_kmalloc_subsystem_setup()
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{
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int i;
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for (i = 0 ; kmalloc_cache[i].object_size != 0 ; i ++)
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{
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struct sos_kslab_cache *new_cache;
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new_cache = sos_kmem_cache_create(kmalloc_cache[i].name,
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kmalloc_cache[i].object_size,
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kmalloc_cache[i].pages_per_slab,
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0,
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SOS_KSLAB_CREATE_MAP
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);
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SOS_ASSERT_FATAL(new_cache != NULL);
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kmalloc_cache[i].cache = new_cache;
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}
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return SOS_OK;
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}
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sos_vaddr_t sos_kmalloc(sos_size_t size, sos_ui32_t flags)
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{
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/* Look for a suitable pre-allocated kmalloc cache */
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int i;
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SOS_ASSERT_FATAL(size > 0);
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for (i = 0 ; kmalloc_cache[i].object_size != 0 ; i ++)
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{
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if (kmalloc_cache[i].object_size >= size)
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return sos_kmem_cache_alloc(kmalloc_cache[i].cache,
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(flags
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& SOS_KMALLOC_ATOMIC)?
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SOS_KSLAB_ALLOC_ATOMIC:0);
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}
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/* none found yet => we directly use the kmem_vmm subsystem to
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allocate whole pages */
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return sos_kmem_vmm_alloc(SOS_PAGE_ALIGN_SUP(size) / SOS_PAGE_SIZE,
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( (flags
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& SOS_KMALLOC_ATOMIC)?
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SOS_KMEM_VMM_ATOMIC:0)
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| SOS_KMEM_VMM_MAP
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);
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}
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sos_ret_t sos_kfree(sos_vaddr_t vaddr)
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{
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/* The trouble here is that we aren't sure whether this object is a
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slab object in a pre-allocated kmalloc cache, or an object
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directly allocated as a kmem_vmm region. */
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/* We first pretend this object is allocated in a pre-allocated
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kmalloc cache */
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if (! sos_kmem_cache_free(vaddr))
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return SOS_OK; /* Great ! We guessed right ! */
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/* Here we're wrong: it appears not to be an object in a
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pre-allocated kmalloc cache. So we try to pretend this is a
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kmem_vmm area */
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return sos_kmem_vmm_free(vaddr);
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}
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