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-rw-r--r--kern/kalloc.c254
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diff --git a/kern/kalloc.c b/kern/kalloc.c
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--- a/kern/kalloc.c
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-/*
- * Mach Operating System
- * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University.
- * Copyright (c) 1993,1994 The University of Utah and
- * the Computer Systems Laboratory (CSL).
- * All rights reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
- * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
- * OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
- * THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie Mellon
- * the rights to redistribute these changes.
- */
-/*
- * File: kern/kalloc.c
- * Author: Avadis Tevanian, Jr.
- * Date: 1985
- *
- * General kernel memory allocator. This allocator is designed
- * to be used by the kernel to manage dynamic memory fast.
- */
-
-#include <mach/machine/vm_types.h>
-#include <mach/vm_param.h>
-
-#include <kern/debug.h>
-#include <kern/zalloc.h>
-#include <kern/kalloc.h>
-#include <vm/vm_kern.h>
-#include <vm/vm_object.h>
-#include <vm/vm_map.h>
-
-
-
-vm_map_t kalloc_map;
-vm_size_t kalloc_map_size = 64 * 1024 * 1024;
-vm_size_t kalloc_max;
-
-/*
- * All allocations of size less than kalloc_max are rounded to the
- * next highest power of 2. This allocator is built on top of
- * the zone allocator. A zone is created for each potential size
- * that we are willing to get in small blocks.
- *
- * We assume that kalloc_max is not greater than 64K;
- * thus 16 is a safe array size for k_zone and k_zone_name.
- */
-
-int first_k_zone = -1;
-struct zone *k_zone[16];
-static char *k_zone_name[16] = {
- "kalloc.1", "kalloc.2",
- "kalloc.4", "kalloc.8",
- "kalloc.16", "kalloc.32",
- "kalloc.64", "kalloc.128",
- "kalloc.256", "kalloc.512",
- "kalloc.1024", "kalloc.2048",
- "kalloc.4096", "kalloc.8192",
- "kalloc.16384", "kalloc.32768"
-};
-
-/*
- * Max number of elements per zone. zinit rounds things up correctly
- * Doing things this way permits each zone to have a different maximum size
- * based on need, rather than just guessing; it also
- * means its patchable in case you're wrong!
- */
-unsigned long k_zone_max[16] = {
- 1024, /* 1 Byte */
- 1024, /* 2 Byte */
- 1024, /* 4 Byte */
- 1024, /* 8 Byte */
- 1024, /* 16 Byte */
- 4096, /* 32 Byte */
- 4096, /* 64 Byte */
- 4096, /* 128 Byte */
- 4096, /* 256 Byte */
- 1024, /* 512 Byte */
- 1024, /* 1024 Byte */
- 1024, /* 2048 Byte */
- 1024, /* 4096 Byte */
- 4096, /* 8192 Byte */
- 64, /* 16384 Byte */
- 64, /* 32768 Byte */
-};
-
-/*
- * Initialize the memory allocator. This should be called only
- * once on a system wide basis (i.e. first processor to get here
- * does the initialization).
- *
- * This initializes all of the zones.
- */
-
-#ifndef NDEBUG
-static int kalloc_init_called;
-#endif
-
-void kalloc_init()
-{
- vm_offset_t min, max;
- vm_size_t size;
- register int i;
-
- assert (! kalloc_init_called);
-
- kalloc_map = kmem_suballoc(kernel_map, &min, &max,
- kalloc_map_size, FALSE);
-
- /*
- * Ensure that zones up to size 8192 bytes exist.
- * This is desirable because messages are allocated
- * with kalloc, and messages up through size 8192 are common.
- */
-
- if (PAGE_SIZE < 16*1024)
- kalloc_max = 16*1024;
- else
- kalloc_max = PAGE_SIZE;
-
- /*
- * Allocate a zone for each size we are going to handle.
- * We specify non-paged memory.
- */
- for (i = 0, size = 1; size < kalloc_max; i++, size <<= 1) {
- if (size < MINSIZE) {
- k_zone[i] = 0;
- continue;
- }
- if (size == MINSIZE) {
- first_k_zone = i;
- }
- k_zone[i] = zinit(size, 0, k_zone_max[i] * size, size,
- size >= PAGE_SIZE ? ZONE_COLLECTABLE : 0,
- k_zone_name[i]);
- }
-
-#ifndef NDEBUG
- kalloc_init_called = 1;
-#endif
-}
-
-vm_offset_t kalloc(size)
- vm_size_t size;
-{
- register int zindex;
- register vm_size_t allocsize;
- vm_offset_t addr;
-
- /* compute the size of the block that we will actually allocate */
-
- assert (kalloc_init_called);
-
- allocsize = size;
- if (size < kalloc_max) {
- allocsize = MINSIZE;
- zindex = first_k_zone;
- while (allocsize < size) {
- allocsize <<= 1;
- zindex++;
- }
- }
-
- /*
- * If our size is still small enough, check the queue for that size
- * and allocate.
- */
-
- if (allocsize < kalloc_max) {
- addr = zalloc(k_zone[zindex]);
- } else {
- if (kmem_alloc_wired(kalloc_map, &addr, allocsize)
- != KERN_SUCCESS)
- addr = 0;
- }
- return(addr);
-}
-
-vm_offset_t kget(size)
- vm_size_t size;
-{
- register int zindex;
- register vm_size_t allocsize;
- vm_offset_t addr;
-
- assert (kalloc_init_called);
-
- /* compute the size of the block that we will actually allocate */
-
- allocsize = size;
- if (size < kalloc_max) {
- allocsize = MINSIZE;
- zindex = first_k_zone;
- while (allocsize < size) {
- allocsize <<= 1;
- zindex++;
- }
- }
-
- /*
- * If our size is still small enough, check the queue for that size
- * and allocate.
- */
-
- if (allocsize < kalloc_max) {
- addr = zget(k_zone[zindex]);
- } else {
- /* This will never work, so we might as well panic */
- panic("kget");
- }
- return(addr);
-}
-
-void
-kfree(data, size)
- vm_offset_t data;
- vm_size_t size;
-{
- register int zindex;
- register vm_size_t freesize;
-
- assert (kalloc_init_called);
-
- freesize = size;
- if (size < kalloc_max) {
- freesize = MINSIZE;
- zindex = first_k_zone;
- while (freesize < size) {
- freesize <<= 1;
- zindex++;
- }
- }
-
- if (freesize < kalloc_max) {
- zfree(k_zone[zindex], data);
- } else {
- kmem_free(kalloc_map, data, freesize);
- }
-}
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