/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <vm/cpm.h>
#include <string.h>
+
+#include <libkern/OSDebug.h>
+#include <sys/kdebug.h>
+
/*
* Variables exported by this module.
*/
vm_map_t kernel_map;
vm_map_t kernel_pageable_map;
+extern boolean_t vm_kernel_ready;
+
/*
* Forward declarations for internal functions.
*/
vm_offset_t *addrp,
vm_size_t size,
vm_offset_t mask,
+ ppnum_t max_pnum,
int flags)
{
vm_object_t object;
vm_object_reference(object);
vm_map_unlock(map);
- kr = cpm_allocate(CAST_DOWN(vm_size_t, map_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, vm_map_trunc_page(map_addr),
vm_object_t object;
vm_object_offset_t offset;
vm_map_entry_t entry;
- vm_map_offset_t map_addr;
+ vm_map_offset_t map_addr, fill_start;
vm_map_offset_t map_mask;
- vm_map_size_t map_size;
+ 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;
+
+ if (! vm_kernel_ready) {
+ panic("kernel_memory_allocate: VM is not ready");
+ }
if (size == 0) {
*addrp = 0;
map_size = vm_map_round_page(size);
map_mask = (vm_map_offset_t) mask;
+ vm_alloc_flags = 0;
+
+ /*
+ * 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;
+ }
+ }
/*
* Allocate a new object (if necessary). We must do this before
object = vm_object_allocate(map_size);
}
- kr = vm_map_find_space(map, &map_addr, map_size, map_mask, 0, &entry);
+ 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_map_unlock(map);
vm_object_lock(object);
- for (i = 0; i < map_size; i += PAGE_SIZE) {
- vm_page_t mem;
+ /*
+ * 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) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto nopage;
+ }
+ vm_object_unlock(object);
+ vm_page_more_fictitious();
+ vm_object_lock(object);
+ }
+ mem->busy = FALSE;
+ }
+
+ /*
+ * 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);
break;
if (flags & KMA_NOPAGEWAIT) {
- 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;
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto nopage;
}
vm_object_unlock(object);
VM_PAGE_WAIT();
}
mem->busy = FALSE;
}
- vm_object_unlock(object);
- if ((kr = vm_map_wire(map, map_addr, 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 + map_size);
+ /*
+ * 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, map_addr, map_addr + map_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)
*/
*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;
}
/*
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;
}
/*
{
kern_return_t kr;
+ 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);
/*
* Wire it down (again)
*/
- vm_page_lock_queues();
+ vm_page_lockspin_queues();
vm_page_wire(mem);
vm_page_unlock_queues();
vm_object_unlock(object);
/*
* Reserve virtual memory allocated up to this time.
*/
-
if (start != VM_MIN_KERNEL_ADDRESS) {
vm_map_offset_t map_addr;
VM_INHERIT_DEFAULT);
}
+
/*
* Account for kernel memory (text, data, bss, vm shenanigans).
* This may include inaccessible "holes" as determined by what
vm_page_wire_count = (atop_64(max_mem) - (vm_page_free_count
+ vm_page_active_count
+ vm_page_inactive_count));
+
+ /*
+ * 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.
+ */
+
+ 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 */
}
projects / apple / xnu.git / blobdiff