204 lines
6.6 KiB
C
204 lines
6.6 KiB
C
/* $NetBSD: kern_malloc.c,v 1.146 2017/07/28 12:28:48 martin Exp $ */
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/*
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* Copyright (c) 1987, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_malloc.c 8.4 (Berkeley) 5/20/95
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*/
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/*
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* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_malloc.c 8.4 (Berkeley) 5/20/95
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*/
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/*
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* Wrapper interface for obsolete malloc(9).
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_malloc.c,v 1.146 2017/07/28 12:28:48 martin Exp $");
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/kmem.h>
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/*
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* Built-in malloc types. Note: ought to be removed.
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*/
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MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
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MALLOC_DEFINE(M_DMAMAP, "DMA map", "bus_dma(9) structures");
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MALLOC_DEFINE(M_FREE, "free", "should be on free list");
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MALLOC_DEFINE(M_TEMP, "temp", "misc. temporary data buffers");
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MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
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MALLOC_DEFINE(M_FTABLE, "fragtbl", "fragment reassembly header");
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MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure");
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MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
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MALLOC_DEFINE(M_MRTABLE, "mrt", "multicast routing tables");
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/*
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* Header contains total size, including the header itself.
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*/
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struct malloc_header {
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size_t mh_size;
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} __aligned(ALIGNBYTES + 1);
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void *
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kern_malloc(unsigned long size, int flags)
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{
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const int kmflags = (flags & M_NOWAIT) ? KM_NOSLEEP : KM_SLEEP;
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size_t allocsize, hdroffset;
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struct malloc_header *mh;
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void *p;
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if (size >= PAGE_SIZE) {
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if (size > (ULONG_MAX-PAGE_SIZE))
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allocsize = ULONG_MAX; /* this will fail later */
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else
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allocsize = PAGE_SIZE + size; /* for page alignment */
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hdroffset = PAGE_SIZE - sizeof(struct malloc_header);
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} else {
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allocsize = sizeof(struct malloc_header) + size;
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hdroffset = 0;
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}
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p = kmem_intr_alloc(allocsize, kmflags);
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if (p == NULL)
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return NULL;
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if ((flags & M_ZERO) != 0) {
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memset(p, 0, allocsize);
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}
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mh = (void *)((char *)p + hdroffset);
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mh->mh_size = allocsize - hdroffset;
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return mh + 1;
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}
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void
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kern_free(void *addr)
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{
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struct malloc_header *mh;
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mh = addr;
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mh--;
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if (mh->mh_size >= PAGE_SIZE + sizeof(struct malloc_header))
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kmem_intr_free((char *)addr - PAGE_SIZE,
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mh->mh_size + PAGE_SIZE - sizeof(struct malloc_header));
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else
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kmem_intr_free(mh, mh->mh_size);
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}
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void *
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kern_realloc(void *curaddr, unsigned long newsize, int flags)
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{
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struct malloc_header *mh;
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unsigned long cursize;
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void *newaddr;
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/*
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* realloc() with a NULL pointer is the same as malloc().
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*/
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if (curaddr == NULL)
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return malloc(newsize, ksp, flags);
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/*
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* realloc() with zero size is the same as free().
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*/
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if (newsize == 0) {
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free(curaddr, ksp);
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return NULL;
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}
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if ((flags & M_NOWAIT) == 0) {
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ASSERT_SLEEPABLE();
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}
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mh = curaddr;
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mh--;
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cursize = mh->mh_size - sizeof(struct malloc_header);
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/*
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* If we already actually have as much as they want, we're done.
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*/
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if (newsize <= cursize)
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return curaddr;
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/*
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* Can't satisfy the allocation with the existing block.
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* Allocate a new one and copy the data.
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*/
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newaddr = malloc(newsize, ksp, flags);
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if (__predict_false(newaddr == NULL)) {
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/*
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* malloc() failed, because flags included M_NOWAIT.
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* Return NULL to indicate that failure. The old
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* pointer is still valid.
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*/
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return NULL;
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}
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memcpy(newaddr, curaddr, cursize);
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/*
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* We were successful: free the old allocation and return
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* the new one.
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*/
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free(curaddr, ksp);
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return newaddr;
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}
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