X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/e5568f75972dfc723778653c11cb6b4dc825716a..2d21ac55c334faf3a56e5634905ed6987fc787d4:/osfmk/vm/vm_kern.c?ds=sidebyside diff --git a/osfmk/vm/vm_kern.c b/osfmk/vm/vm_kern.c index b8585d73a..f8b306855 100644 --- a/osfmk/vm/vm_kern.c +++ b/osfmk/vm/vm_kern.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ @@ -57,7 +63,6 @@ * Kernel memory management. */ -#include #include #include #include @@ -72,6 +77,10 @@ #include #include + +#include +#include + /* * Variables exported by this module. */ @@ -79,13 +88,15 @@ vm_map_t kernel_map; vm_map_t kernel_pageable_map; +extern boolean_t vm_kernel_ready; + /* * Forward declarations for internal functions. */ extern kern_return_t kmem_alloc_pages( register vm_object_t object, register vm_object_offset_t offset, - register vm_size_t size); + register vm_object_size_t size); extern void kmem_remap_pages( register vm_object_t object, @@ -96,18 +107,21 @@ extern void kmem_remap_pages( kern_return_t kmem_alloc_contig( - vm_map_t map, - vm_offset_t *addrp, - vm_size_t size, - vm_offset_t mask, - int flags) + vm_map_t map, + vm_offset_t *addrp, + vm_size_t size, + vm_offset_t mask, + ppnum_t max_pnum, + int flags) { vm_object_t object; - vm_page_t m, pages; - kern_return_t kr; - vm_offset_t addr, i; vm_object_offset_t offset; + vm_map_offset_t map_addr; + vm_map_offset_t map_mask; + vm_map_size_t map_size, i; vm_map_entry_t entry; + vm_page_t m, pages; + kern_return_t kr; if (map == VM_MAP_NULL || (flags && (flags ^ KMA_KOBJECT))) return KERN_INVALID_ARGUMENT; @@ -117,68 +131,74 @@ kmem_alloc_contig( return KERN_INVALID_ARGUMENT; } - size = round_page_32(size); - if ((flags & KMA_KOBJECT) == 0) { - object = vm_object_allocate(size); - kr = vm_map_find_space(map, &addr, size, mask, &entry); - } - else { - object = kernel_object; - kr = vm_map_find_space(map, &addr, size, mask, &entry); - } + map_size = vm_map_round_page(size); + map_mask = (vm_map_offset_t)mask; - if ((flags & KMA_KOBJECT) == 0) { - entry->object.vm_object = object; - entry->offset = offset = 0; + /* + * Allocate a new object (if necessary) and the reference we + * will be donating to the map entry. We must do this before + * locking the map, or risk deadlock with the default pager. + */ + if ((flags & KMA_KOBJECT) != 0) { + object = kernel_object; + vm_object_reference(object); } else { - offset = addr - VM_MIN_KERNEL_ADDRESS; - - if (entry->object.vm_object == VM_OBJECT_NULL) { - vm_object_reference(object); - entry->object.vm_object = object; - entry->offset = offset; - } + object = vm_object_allocate(map_size); } - if (kr != KERN_SUCCESS) { - if ((flags & KMA_KOBJECT) == 0) - vm_object_deallocate(object); + kr = vm_map_find_space(map, &map_addr, map_size, map_mask, 0, &entry); + if (KERN_SUCCESS != kr) { + vm_object_deallocate(object); return kr; } + entry->object.vm_object = object; + entry->offset = offset = (object == kernel_object) ? + map_addr - VM_MIN_KERNEL_ADDRESS : 0; + + /* Take an extra object ref in case the map entry gets deleted */ + vm_object_reference(object); vm_map_unlock(map); - kr = cpm_allocate(size, &pages, FALSE); + kr = cpm_allocate(CAST_DOWN(vm_size_t, map_size), &pages, max_pnum, FALSE); if (kr != KERN_SUCCESS) { - vm_map_remove(map, addr, addr + size, 0); + vm_map_remove(map, vm_map_trunc_page(map_addr), + vm_map_round_page(map_addr + map_size), 0); + vm_object_deallocate(object); *addrp = 0; return kr; } vm_object_lock(object); - for (i = 0; i < size; i += PAGE_SIZE) { + for (i = 0; i < map_size; i += PAGE_SIZE) { m = pages; pages = NEXT_PAGE(m); + *(NEXT_PAGE_PTR(m)) = VM_PAGE_NULL; m->busy = FALSE; vm_page_insert(m, object, offset + i); } vm_object_unlock(object); - if ((kr = vm_map_wire(map, addr, addr + size, VM_PROT_DEFAULT, FALSE)) + if ((kr = vm_map_wire(map, vm_map_trunc_page(map_addr), + vm_map_round_page(map_addr + map_size), VM_PROT_DEFAULT, FALSE)) != KERN_SUCCESS) { if (object == kernel_object) { vm_object_lock(object); - vm_object_page_remove(object, offset, offset + size); + vm_object_page_remove(object, offset, offset + map_size); vm_object_unlock(object); } - vm_map_remove(map, addr, addr + size, 0); + vm_map_remove(map, vm_map_trunc_page(map_addr), + vm_map_round_page(map_addr + map_size), 0); + vm_object_deallocate(object); return kr; } + vm_object_deallocate(object); + if (object == kernel_object) - vm_map_simplify(map, addr); + vm_map_simplify(map, map_addr); - *addrp = addr; + *addrp = map_addr; return KERN_SUCCESS; } @@ -193,6 +213,10 @@ kmem_alloc_contig( * KMA_HERE *addrp is base address, else "anywhere" * KMA_NOPAGEWAIT don't wait for pages if unavailable * KMA_KOBJECT use kernel_object + * KMA_LOMEM support for 32 bit devices in a 64 bit world + * if set and a lomemory pool is available + * grab pages from it... this also implies + * KMA_NOPAGEWAIT */ kern_return_t @@ -203,112 +227,197 @@ kernel_memory_allocate( register vm_offset_t mask, int flags) { - vm_object_t object = VM_OBJECT_NULL; + vm_object_t object; + vm_object_offset_t offset; vm_map_entry_t entry; - vm_object_offset_t offset; - vm_offset_t addr; - vm_offset_t i; + vm_map_offset_t map_addr, fill_start; + vm_map_offset_t map_mask; + vm_map_size_t map_size, fill_size; + vm_map_size_t i; kern_return_t kr; + vm_page_t mem; + int vm_alloc_flags; - size = round_page_32(size); - if ((flags & KMA_KOBJECT) == 0) { - /* - * Allocate a new object. We must do this before locking - * the map, or risk deadlock with the default pager: - * device_read_alloc uses kmem_alloc, - * which tries to allocate an object, - * which uses kmem_alloc_wired to get memory, - * which blocks for pages. - * then the default pager needs to read a block - * to process a memory_object_data_write, - * and device_read_alloc calls kmem_alloc - * and deadlocks on the map lock. - */ - object = vm_object_allocate(size); - kr = vm_map_find_space(map, &addr, size, mask, &entry); + if (! vm_kernel_ready) { + panic("kernel_memory_allocate: VM is not ready"); } - else { - object = kernel_object; - kr = vm_map_find_space(map, &addr, size, mask, &entry); + + if (size == 0) { + *addrp = 0; + return KERN_INVALID_ARGUMENT; } - if (kr != KERN_SUCCESS) { - if ((flags & KMA_KOBJECT) == 0) - vm_object_deallocate(object); - return kr; + if (flags & KMA_LOMEM) { + if ( !(flags & KMA_NOPAGEWAIT) ) { + *addrp = 0; + return KERN_INVALID_ARGUMENT; + } } - if ((flags & KMA_KOBJECT) == 0) { - entry->object.vm_object = object; - entry->offset = offset = 0; - } else { - offset = addr - VM_MIN_KERNEL_ADDRESS; + map_size = vm_map_round_page(size); + map_mask = (vm_map_offset_t) mask; + vm_alloc_flags = 0; - if (entry->object.vm_object == VM_OBJECT_NULL) { - vm_object_reference(object); - entry->object.vm_object = object; - entry->offset = offset; + /* + * Guard pages: + * + * Guard pages are implemented as ficticious pages. By placing guard pages + * on either end of a stack, they can help detect cases where a thread walks + * off either end of its stack. They are allocated and set up here and attempts + * to access those pages are trapped in vm_fault_page(). + * + * The map_size we were passed may include extra space for + * guard pages. If those were requested, then back it out of fill_size + * since vm_map_find_space() takes just the actual size not including + * guard pages. Similarly, fill_start indicates where the actual pages + * will begin in the range. + */ + + fill_start = 0; + fill_size = map_size; + if (flags & KMA_GUARD_FIRST) { + vm_alloc_flags |= VM_FLAGS_GUARD_BEFORE; + fill_start += PAGE_SIZE_64; + fill_size -= PAGE_SIZE_64; + if (map_size < fill_start + fill_size) { + /* no space for a guard page */ + *addrp = 0; + return KERN_INVALID_ARGUMENT; + } + } + if (flags & KMA_GUARD_LAST) { + vm_alloc_flags |= VM_FLAGS_GUARD_AFTER; + fill_size -= PAGE_SIZE_64; + if (map_size <= fill_start + fill_size) { + /* no space for a guard page */ + *addrp = 0; + return KERN_INVALID_ARGUMENT; } } /* - * Since we have not given out this address yet, - * it is safe to unlock the map. Except of course - * we must make certain no one coalesces our address - * or does a blind vm_deallocate and removes the object - * an extra object reference will suffice to protect - * against both contingencies. + * Allocate a new object (if necessary). We must do this before + * locking the map, or risk deadlock with the default pager. */ + if ((flags & KMA_KOBJECT) != 0) { + object = kernel_object; + vm_object_reference(object); + } else { + object = vm_object_allocate(map_size); + } + + kr = vm_map_find_space(map, &map_addr, + fill_size, map_mask, + vm_alloc_flags, &entry); + if (KERN_SUCCESS != kr) { + vm_object_deallocate(object); + return kr; + } + + entry->object.vm_object = object; + entry->offset = offset = (object == kernel_object) ? + map_addr - VM_MIN_KERNEL_ADDRESS : 0; + vm_object_reference(object); vm_map_unlock(map); vm_object_lock(object); - for (i = 0; i < size; i += PAGE_SIZE) { - vm_page_t mem; - while ((mem = vm_page_alloc(object, - offset + (vm_object_offset_t)i)) - == VM_PAGE_NULL) { + /* + * Allocate the lower guard page if one was requested. The guard + * page extends up to fill_start which is where the real memory + * begins. + */ + + for (i = 0; i < fill_start; i += PAGE_SIZE) { + for (;;) { + mem = vm_page_alloc_guard(object, offset + i); + if (mem != VM_PAGE_NULL) + break; if (flags & KMA_NOPAGEWAIT) { - if (object == kernel_object) - vm_object_page_remove(object, offset, - offset + (vm_object_offset_t)i); - vm_object_unlock(object); - vm_map_remove(map, addr, addr + size, 0); - vm_object_deallocate(object); - return KERN_RESOURCE_SHORTAGE; + kr = KERN_RESOURCE_SHORTAGE; + goto nopage; } vm_object_unlock(object); - VM_PAGE_WAIT(); + vm_page_more_fictitious(); vm_object_lock(object); } mem->busy = FALSE; } - vm_object_unlock(object); - if ((kr = vm_map_wire(map, addr, addr + size, VM_PROT_DEFAULT, FALSE)) - != KERN_SUCCESS) { - if (object == kernel_object) { + /* + * Allocate the real memory here. This extends from offset fill_start + * for fill_size bytes. + */ + + for (i = fill_start; i < fill_start + fill_size; i += PAGE_SIZE) { + for (;;) { + if (flags & KMA_LOMEM) + mem = vm_page_alloclo(object, offset + i); + else + mem = vm_page_alloc(object, offset + i); + + if (mem != VM_PAGE_NULL) + break; + + if (flags & KMA_NOPAGEWAIT) { + kr = KERN_RESOURCE_SHORTAGE; + goto nopage; + } + vm_object_unlock(object); + VM_PAGE_WAIT(); vm_object_lock(object); - vm_object_page_remove(object, offset, offset + size); + } + mem->busy = FALSE; + } + + /* + * Lastly, allocate the ending guard page if requested. This starts at the ending + * address from the loop above up to the map_size that was originaly + * requested. + */ + + for (i = fill_start + fill_size; i < map_size; i += PAGE_SIZE) { + for (;;) { + mem = vm_page_alloc_guard(object, offset + i); + if (mem != VM_PAGE_NULL) + break; + if (flags & KMA_NOPAGEWAIT) { + kr = KERN_RESOURCE_SHORTAGE; + goto nopage; + } vm_object_unlock(object); + vm_page_more_fictitious(); + vm_object_lock(object); } - vm_map_remove(map, addr, addr + size, 0); - vm_object_deallocate(object); - return (kr); + mem->busy = FALSE; + } + vm_object_unlock(object); + + kr = vm_map_wire(map, map_addr, map_addr + map_size, + VM_PROT_DEFAULT, FALSE); + if (kr != KERN_SUCCESS) { + vm_object_lock(object); + goto nopage; } + /* now that the page is wired, we no longer have to fear coalesce */ vm_object_deallocate(object); if (object == kernel_object) - vm_map_simplify(map, addr); + vm_map_simplify(map, map_addr); /* * Return the memory, not zeroed. */ -#if (NCPUS > 1) && i860 - bzero( addr, size ); -#endif /* #if (NCPUS > 1) && i860 */ - *addrp = addr; + *addrp = CAST_DOWN(vm_offset_t, map_addr); return KERN_SUCCESS; + +nopage: + if (object == kernel_object) + vm_object_page_remove(object, offset, offset + i); + vm_object_unlock(object); + vm_map_remove(map, map_addr, map_addr + map_size, 0); + vm_object_deallocate(object); + return KERN_RESOURCE_SHORTAGE; } /* @@ -324,7 +433,9 @@ kmem_alloc( vm_offset_t *addrp, vm_size_t size) { - return kernel_memory_allocate(map, addrp, size, 0, 0); + kern_return_t kr = kernel_memory_allocate(map, addrp, size, 0, 0); + TRACE_MACHLEAKS(KMEM_ALLOC_CODE, KMEM_ALLOC_CODE_2, size, *addrp); + return kr; } /* @@ -339,24 +450,28 @@ kmem_alloc( */ kern_return_t kmem_realloc( - vm_map_t map, - vm_offset_t oldaddr, - vm_size_t oldsize, - vm_offset_t *newaddrp, - vm_size_t newsize) + vm_map_t map, + vm_offset_t oldaddr, + vm_size_t oldsize, + vm_offset_t *newaddrp, + vm_size_t newsize) { - vm_offset_t oldmin, oldmax; - vm_offset_t newaddr; - vm_offset_t offset; - vm_object_t object; - vm_map_entry_t oldentry, newentry; - vm_page_t mem; - kern_return_t kr; + vm_object_t object; + vm_object_offset_t offset; + vm_map_offset_t oldmapmin; + vm_map_offset_t oldmapmax; + vm_map_offset_t newmapaddr; + vm_map_size_t oldmapsize; + vm_map_size_t newmapsize; + vm_map_entry_t oldentry; + vm_map_entry_t newentry; + vm_page_t mem; + kern_return_t kr; - oldmin = trunc_page_32(oldaddr); - oldmax = round_page_32(oldaddr + oldsize); - oldsize = oldmax - oldmin; - newsize = round_page_32(newsize); + oldmapmin = vm_map_trunc_page(oldaddr); + oldmapmax = vm_map_round_page(oldaddr + oldsize); + oldmapsize = oldmapmax - oldmapmin; + newmapsize = vm_map_round_page(newsize); /* @@ -365,7 +480,7 @@ kmem_realloc( vm_map_lock(map); - if (!vm_map_lookup_entry(map, oldmin, &oldentry)) + if (!vm_map_lookup_entry(map, oldmapmin, &oldentry)) panic("kmem_realloc"); object = oldentry->object.vm_object; @@ -380,33 +495,33 @@ kmem_realloc( /* attempt is made to realloc a kmem_alloc'd area */ vm_object_lock(object); vm_map_unlock(map); - if (object->size != oldsize) + if (object->size != oldmapsize) panic("kmem_realloc"); - object->size = newsize; + object->size = newmapsize; vm_object_unlock(object); /* allocate the new pages while expanded portion of the */ /* object is still not mapped */ - kmem_alloc_pages(object, oldsize, newsize-oldsize); - + kmem_alloc_pages(object, vm_object_round_page(oldmapsize), + vm_object_round_page(newmapsize-oldmapsize)); /* * Find space for the new region. */ - kr = vm_map_find_space(map, &newaddr, newsize, (vm_offset_t) 0, - &newentry); + kr = vm_map_find_space(map, &newmapaddr, newmapsize, + (vm_map_offset_t) 0, 0, &newentry); if (kr != KERN_SUCCESS) { vm_object_lock(object); - for(offset = oldsize; - offsetsize = oldsize; + object->size = oldmapsize; vm_object_unlock(object); vm_object_deallocate(object); return kr; @@ -421,27 +536,25 @@ kmem_realloc( vm_object_reference(object); vm_map_unlock(map); - if ((kr = vm_map_wire(map, newaddr, newaddr + newsize, - VM_PROT_DEFAULT, FALSE)) != KERN_SUCCESS) { - vm_map_remove(map, newaddr, newaddr + newsize, 0); + kr = vm_map_wire(map, newmapaddr, newmapaddr + newmapsize, VM_PROT_DEFAULT, FALSE); + if (KERN_SUCCESS != kr) { + vm_map_remove(map, newmapaddr, newmapaddr + newmapsize, 0); vm_object_lock(object); - for(offset = oldsize; - offsetsize = oldsize; + object->size = oldmapsize; vm_object_unlock(object); vm_object_deallocate(object); return (kr); } vm_object_deallocate(object); - - *newaddrp = newaddr; + *newaddrp = CAST_DOWN(vm_offset_t, newmapaddr); return KERN_SUCCESS; } @@ -495,22 +608,26 @@ kmem_alloc_pageable( vm_offset_t *addrp, vm_size_t size) { - vm_offset_t addr; + vm_map_offset_t map_addr; + vm_map_size_t map_size; kern_return_t kr; #ifndef normal - addr = (vm_map_min(map)) + 0x1000; + map_addr = (vm_map_min(map)) + 0x1000; #else - addr = vm_map_min(map); + map_addr = vm_map_min(map); #endif - kr = vm_map_enter(map, &addr, round_page_32(size), - (vm_offset_t) 0, TRUE, + map_size = vm_map_round_page(size); + + kr = vm_map_enter(map, &map_addr, map_size, + (vm_map_offset_t) 0, VM_FLAGS_ANYWHERE, VM_OBJECT_NULL, (vm_object_offset_t) 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); + if (kr != KERN_SUCCESS) return kr; - *addrp = addr; + *addrp = CAST_DOWN(vm_offset_t, map_addr); return KERN_SUCCESS; } @@ -530,8 +647,10 @@ kmem_free( { kern_return_t kr; - kr = vm_map_remove(map, trunc_page_32(addr), - round_page_32(addr + size), + TRACE_MACHLEAKS(KMEM_FREE_CODE, KMEM_FREE_CODE_2, size, addr); + + kr = vm_map_remove(map, vm_map_trunc_page(addr), + vm_map_round_page(addr + size), VM_MAP_REMOVE_KUNWIRE); if (kr != KERN_SUCCESS) panic("kmem_free"); @@ -545,29 +664,29 @@ kern_return_t kmem_alloc_pages( register vm_object_t object, register vm_object_offset_t offset, - register vm_size_t size) + register vm_object_size_t size) { + vm_object_size_t alloc_size; - size = round_page_32(size); + alloc_size = vm_object_round_page(size); vm_object_lock(object); - while (size) { + while (alloc_size) { register vm_page_t mem; /* * Allocate a page */ - while ((mem = vm_page_alloc(object, offset)) - == VM_PAGE_NULL) { + while (VM_PAGE_NULL == + (mem = vm_page_alloc(object, offset))) { vm_object_unlock(object); VM_PAGE_WAIT(); vm_object_lock(object); } + mem->busy = FALSE; - + alloc_size -= PAGE_SIZE; offset += PAGE_SIZE; - size -= PAGE_SIZE; - mem->busy = FALSE; } vm_object_unlock(object); return KERN_SUCCESS; @@ -586,12 +705,19 @@ kmem_remap_pages( register vm_offset_t end, vm_prot_t protection) { + + vm_map_offset_t map_start; + vm_map_offset_t map_end; + /* * Mark the pmap region as not pageable. */ - pmap_pageable(kernel_pmap, start, end, FALSE); + map_start = vm_map_trunc_page(start); + map_end = vm_map_round_page(end); + + pmap_pageable(kernel_pmap, map_start, map_end, FALSE); - while (start < end) { + while (map_start < map_end) { register vm_page_t mem; vm_object_lock(object); @@ -605,21 +731,29 @@ kmem_remap_pages( /* * Wire it down (again) */ - vm_page_lock_queues(); + vm_page_lockspin_queues(); vm_page_wire(mem); vm_page_unlock_queues(); vm_object_unlock(object); + /* + * ENCRYPTED SWAP: + * The page is supposed to be wired now, so it + * shouldn't be encrypted at this point. It can + * safely be entered in the page table. + */ + ASSERT_PAGE_DECRYPTED(mem); + /* * Enter it in the kernel pmap. The page isn't busy, * but this shouldn't be a problem because it is wired. */ - PMAP_ENTER(kernel_pmap, start, mem, protection, + PMAP_ENTER(kernel_pmap, map_start, mem, protection, ((unsigned int)(mem->object->wimg_bits)) & VM_WIMG_MASK, TRUE); - start += PAGE_SIZE; + map_start += PAGE_SIZE; offset += PAGE_SIZE; } } @@ -645,13 +779,15 @@ kmem_suballoc( vm_offset_t *addr, vm_size_t size, boolean_t pageable, - boolean_t anywhere, + int flags, vm_map_t *new_map) { - vm_map_t map; - kern_return_t kr; + vm_map_t map; + vm_map_offset_t map_addr; + vm_map_size_t map_size; + kern_return_t kr; - size = round_page_32(size); + map_size = vm_map_round_page(size); /* * Need reference on submap object because it is internal @@ -660,10 +796,11 @@ kmem_suballoc( */ vm_object_reference(vm_submap_object); - if (anywhere == TRUE) - *addr = (vm_offset_t)vm_map_min(parent); - kr = vm_map_enter(parent, addr, size, - (vm_offset_t) 0, anywhere, + map_addr = (flags & VM_FLAGS_ANYWHERE) ? + vm_map_min(parent) : vm_map_trunc_page(*addr); + + kr = vm_map_enter(parent, &map_addr, map_size, + (vm_map_offset_t) 0, flags, vm_submap_object, (vm_object_offset_t) 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); if (kr != KERN_SUCCESS) { @@ -672,20 +809,21 @@ kmem_suballoc( } pmap_reference(vm_map_pmap(parent)); - map = vm_map_create(vm_map_pmap(parent), *addr, *addr + size, pageable); + map = vm_map_create(vm_map_pmap(parent), map_addr, map_addr + map_size, pageable); if (map == VM_MAP_NULL) panic("kmem_suballoc: vm_map_create failed"); /* "can't happen" */ - kr = vm_map_submap(parent, *addr, *addr + size, map, *addr, FALSE); + kr = vm_map_submap(parent, map_addr, map_addr + map_size, map, map_addr, FALSE); if (kr != KERN_SUCCESS) { /* * See comment preceding vm_map_submap(). */ - vm_map_remove(parent, *addr, *addr + size, VM_MAP_NO_FLAGS); + vm_map_remove(parent, map_addr, map_addr + map_size, VM_MAP_NO_FLAGS); vm_map_deallocate(map); /* also removes ref to pmap */ vm_object_deallocate(vm_submap_object); return (kr); } + *addr = CAST_DOWN(vm_offset_t, map_addr); *new_map = map; return (KERN_SUCCESS); } @@ -701,25 +839,33 @@ kmem_init( vm_offset_t start, vm_offset_t end) { - kernel_map = vm_map_create(pmap_kernel(), - VM_MIN_KERNEL_ADDRESS, end, - FALSE); + vm_map_offset_t map_start; + vm_map_offset_t map_end; + + map_start = vm_map_trunc_page(start); + map_end = vm_map_round_page(end); + kernel_map = vm_map_create(pmap_kernel(),VM_MIN_KERNEL_ADDRESS, + map_end, FALSE); /* * Reserve virtual memory allocated up to this time. */ - if (start != VM_MIN_KERNEL_ADDRESS) { - vm_offset_t addr = VM_MIN_KERNEL_ADDRESS; + vm_map_offset_t map_addr; + + map_addr = VM_MIN_KERNEL_ADDRESS; (void) vm_map_enter(kernel_map, - &addr, start - VM_MIN_KERNEL_ADDRESS, - (vm_offset_t) 0, TRUE, - VM_OBJECT_NULL, - (vm_object_offset_t) 0, FALSE, - VM_PROT_DEFAULT, VM_PROT_ALL, - VM_INHERIT_DEFAULT); + &map_addr, + (vm_map_size_t)(map_start - VM_MIN_KERNEL_ADDRESS), + (vm_map_offset_t) 0, + VM_FLAGS_ANYWHERE | VM_FLAGS_NO_PMAP_CHECK, + VM_OBJECT_NULL, + (vm_object_offset_t) 0, FALSE, + VM_PROT_NONE, VM_PROT_NONE, + VM_INHERIT_DEFAULT); } + /* * Account for kernel memory (text, data, bss, vm shenanigans). * This may include inaccessible "holes" as determined by what @@ -728,78 +874,26 @@ kmem_init( vm_page_wire_count = (atop_64(max_mem) - (vm_page_free_count + vm_page_active_count + vm_page_inactive_count)); -} - - -/* - * kmem_io_object_trunc: - * - * Truncate an object vm_map_copy_t. - * Called by the scatter/gather list network code to remove pages from - * the tail end of a packet. Also unwires the objects pages. - */ - -kern_return_t -kmem_io_object_trunc(copy, new_size) - vm_map_copy_t copy; /* IN/OUT copy object */ - register vm_size_t new_size; /* IN new object size */ -{ - register vm_size_t offset, old_size; - assert(copy->type == VM_MAP_COPY_OBJECT); - - old_size = (vm_size_t)round_page_64(copy->size); - copy->size = new_size; - new_size = round_page_32(new_size); - - vm_object_lock(copy->cpy_object); - vm_object_page_remove(copy->cpy_object, - (vm_object_offset_t)new_size, (vm_object_offset_t)old_size); - for (offset = 0; offset < new_size; offset += PAGE_SIZE) { - register vm_page_t mem; - - if ((mem = vm_page_lookup(copy->cpy_object, - (vm_object_offset_t)offset)) == VM_PAGE_NULL) - panic("kmem_io_object_trunc: unable to find object page"); - - /* - * Make sure these pages are marked dirty - */ - mem->dirty = TRUE; - vm_page_lock_queues(); - vm_page_unwire(mem); - vm_page_unlock_queues(); - } - copy->cpy_object->size = new_size; /* adjust size of object */ - vm_object_unlock(copy->cpy_object); - return(KERN_SUCCESS); -} - -/* - * kmem_io_object_deallocate: - * - * Free an vm_map_copy_t. - * Called by the scatter/gather list network code to free a packet. - */ - -void -kmem_io_object_deallocate( - vm_map_copy_t copy) /* IN/OUT copy object */ -{ - kern_return_t ret; - - /* - * Clear out all the object pages (this will leave an empty object). - */ - ret = kmem_io_object_trunc(copy, 0); - if (ret != KERN_SUCCESS) - panic("kmem_io_object_deallocate: unable to truncate object"); /* - * ...and discard the copy object. + * Set the default global user wire limit which limits the amount of + * memory that can be locked via mlock(). We set this to the total number of + * pages that are potentially usable by a user app (max_mem) minus + * 1000 pages. This keeps 4MB in reserve for the kernel which will hopefully be + * enough to avoid memory deadlocks. If for some reason the system has less than + * 2000 pages of memory at this point, then we'll allow users to lock up to 80% + * of that. This can be overridden via a sysctl. */ - vm_map_copy_discard(copy); + + if (max_mem > 2000) + vm_global_user_wire_limit = max_mem - 1000; + else + vm_global_user_wire_limit = max_mem * 100 / 80; + + vm_user_wire_limit = vm_global_user_wire_limit; /* the default per user limit is the same as the global limit */ } + /* * Routine: copyinmap * Purpose: @@ -808,23 +902,36 @@ kmem_io_object_deallocate( * is incomplete; it handles the current user map * and the kernel map/submaps. */ -boolean_t +kern_return_t copyinmap( - vm_map_t map, - vm_offset_t fromaddr, - vm_offset_t toaddr, - vm_size_t length) + vm_map_t map, + vm_map_offset_t fromaddr, + void *todata, + vm_size_t length) { - if (vm_map_pmap(map) == pmap_kernel()) { + kern_return_t kr = KERN_SUCCESS; + vm_map_t oldmap; + + if (vm_map_pmap(map) == pmap_kernel()) + { /* assume a correct copy */ - memcpy((void *)toaddr, (void *)fromaddr, length); - return FALSE; + memcpy(todata, CAST_DOWN(void *, fromaddr), length); + } + else if (current_map() == map) + { + if (copyin(fromaddr, todata, length) != 0) + kr = KERN_INVALID_ADDRESS; } - - if (current_map() == map) - return copyin((char *)fromaddr, (char *)toaddr, length); - - return TRUE; + else + { + vm_map_reference(map); + oldmap = vm_map_switch(map); + if (copyin(fromaddr, todata, length) != 0) + kr = KERN_INVALID_ADDRESS; + vm_map_switch(oldmap); + vm_map_deallocate(map); + } + return kr; } /* @@ -835,42 +942,45 @@ copyinmap( * is incomplete; it handles the current user map * and the kernel map/submaps. */ -boolean_t +kern_return_t copyoutmap( - vm_map_t map, - vm_offset_t fromaddr, - vm_offset_t toaddr, - vm_size_t length) + vm_map_t map, + void *fromdata, + vm_map_address_t toaddr, + vm_size_t length) { if (vm_map_pmap(map) == pmap_kernel()) { /* assume a correct copy */ - memcpy((void *)toaddr, (void *)fromaddr, length); - return FALSE; + memcpy(CAST_DOWN(void *, toaddr), fromdata, length); + return KERN_SUCCESS; } - if (current_map() == map) - return copyout((char *)fromaddr, (char *)toaddr, length); + if (current_map() != map) + return KERN_NOT_SUPPORTED; - return TRUE; + if (copyout(fromdata, toaddr, length) != 0) + return KERN_INVALID_ADDRESS; + + return KERN_SUCCESS; } kern_return_t vm_conflict_check( vm_map_t map, - vm_offset_t off, - vm_size_t len, - memory_object_t pager, + vm_map_offset_t off, + vm_map_size_t len, + memory_object_t pager, vm_object_offset_t file_off) { vm_map_entry_t entry; vm_object_t obj; vm_object_offset_t obj_off; vm_map_t base_map; - vm_offset_t base_offset; - vm_offset_t original_offset; + vm_map_offset_t base_offset; + vm_map_offset_t original_offset; kern_return_t kr; - vm_size_t local_len; + vm_map_size_t local_len; base_map = map; base_offset = off;