1 /*- 2 * Copyright (c) 2003 The FreeBSD Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/malloc.h> 34 #include <sys/mutex.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 #include <sys/vmmeter.h> 38 #include <vm/vm.h> 39 #include <vm/vm_page.h> 40 #include <vm/vm_kern.h> 41 #include <vm/vm_pageout.h> 42 #include <vm/vm_extern.h> 43 #include <vm/uma.h> 44 #include <vm/uma.h> 45 #include <vm/uma_int.h> 46 #include <machine/md_var.h> 47 #include <machine/vmparam.h> 48 49 static int hw_uma_mdpages; 50 SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0, 51 "UMA MD pages in use"); 52 53 void * 54 uma_small_alloc(uma_zone_t zone, vm_size_t bytes, u_int8_t *flags, int wait) 55 { 56 void *va; 57 vm_paddr_t pa; 58 vm_page_t m; 59 60 *flags = UMA_SLAB_PRIV; 61 62 m = vm_page_alloc(NULL, 0, 63 malloc2vm_flags(wait) | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ); 64 if (m == NULL) 65 return (NULL); 66 67 pa = VM_PAGE_TO_PHYS(m); 68 69 /* On book-e sizeof(void *) < sizeof(vm_paddr_t) */ 70 if ((vm_offset_t)pa != pa) 71 return (NULL); 72 73 va = (void *)(vm_offset_t)pa; 74 75 if (!hw_direct_map) 76 pmap_kenter((vm_offset_t)va, VM_PAGE_TO_PHYS(m)); 77 78 if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0) 79 bzero(va, PAGE_SIZE); 80 atomic_add_int(&hw_uma_mdpages, 1); 81 82 return (va); 83 } 84 85 void 86 uma_small_free(void *mem, vm_size_t size, u_int8_t flags) 87 { 88 vm_page_t m; 89 90 if (!hw_direct_map) 91 pmap_remove(kernel_pmap,(vm_offset_t)mem, 92 (vm_offset_t)mem + PAGE_SIZE); 93 94 m = PHYS_TO_VM_PAGE((vm_offset_t)mem); 95 m->wire_count--; 96 vm_page_free(m); 97 atomic_subtract_int(&vm_cnt.v_wire_count, 1); 98 atomic_subtract_int(&hw_uma_mdpages, 1); 99 } 100