/*
- * 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 <mach/kern_return.h>
#include <mach/vm_param.h>
#include <kern/assert.h>
-#include <kern/lock.h>
#include <kern/thread.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
+#include <vm/vm_compressor.h>
#include <vm/vm_pageout.h>
#include <kern/misc_protos.h>
#include <vm/cpm.h>
#include <string.h>
+
+#include <libkern/OSDebug.h>
+#include <libkern/crypto/sha2.h>
+#include <sys/kdebug.h>
+
+#include <san/kasan.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.
*/
extern kern_return_t kmem_alloc_pages(
- register vm_object_t object,
- register vm_object_offset_t offset,
- register vm_object_size_t size);
-
-extern void kmem_remap_pages(
- register vm_object_t object,
- register vm_object_offset_t offset,
- register vm_offset_t start,
- register vm_offset_t end,
- vm_prot_t protection);
+ vm_object_t object,
+ vm_object_offset_t offset,
+ vm_object_size_t size);
kern_return_t
kmem_alloc_contig(
vm_offset_t *addrp,
vm_size_t size,
vm_offset_t mask,
- int flags)
+ ppnum_t max_pnum,
+ ppnum_t pnum_mask,
+ int flags,
+ vm_tag_t tag)
{
vm_object_t object;
vm_object_offset_t offset;
vm_page_t m, pages;
kern_return_t kr;
- if (map == VM_MAP_NULL || (flags && (flags ^ KMA_KOBJECT)))
+ assert(VM_KERN_MEMORY_NONE != tag);
+
+ if (map == VM_MAP_NULL || (flags & ~(KMA_KOBJECT | KMA_LOMEM | KMA_NOPAGEWAIT)))
return KERN_INVALID_ARGUMENT;
+
+ map_size = vm_map_round_page(size,
+ VM_MAP_PAGE_MASK(map));
+ map_mask = (vm_map_offset_t)mask;
- if (size == 0) {
+ /* Check for zero allocation size (either directly or via overflow) */
+ if (map_size == 0) {
*addrp = 0;
return KERN_INVALID_ARGUMENT;
}
- map_size = vm_map_round_page(size);
- map_mask = (vm_map_offset_t)mask;
-
/*
* Allocate a new object (if necessary) and the reference we
* will be donating to the map entry. We must do this before
object = vm_object_allocate(map_size);
}
- kr = vm_map_find_space(map, &map_addr, map_size, map_mask, &entry);
+ kr = vm_map_find_space(map, &map_addr, map_size, map_mask, 0,
+ VM_MAP_KERNEL_FLAGS_NONE, tag, &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;
+ if (object == kernel_object) {
+ offset = map_addr;
+ } else {
+ offset = 0;
+ }
+ VME_OBJECT_SET(entry, object);
+ VME_OFFSET_SET(entry, offset);
/* Take an extra object ref in case the map entry gets deleted */
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, pnum_mask, FALSE, flags);
if (kr != KERN_SUCCESS) {
- vm_map_remove(map, vm_map_trunc_page(map_addr),
- vm_map_round_page(map_addr + map_size), 0);
+ vm_map_remove(map,
+ vm_map_trunc_page(map_addr,
+ VM_MAP_PAGE_MASK(map)),
+ vm_map_round_page(map_addr + map_size,
+ VM_MAP_PAGE_MASK(map)),
+ VM_MAP_REMOVE_NO_FLAGS);
vm_object_deallocate(object);
*addrp = 0;
return kr;
for (i = 0; i < map_size; i += PAGE_SIZE) {
m = pages;
pages = NEXT_PAGE(m);
- m->busy = FALSE;
+ *(NEXT_PAGE_PTR(m)) = VM_PAGE_NULL;
+ m->vmp_busy = FALSE;
vm_page_insert(m, object, offset + i);
}
vm_object_unlock(object);
- 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) {
+ kr = vm_map_wire_kernel(map,
+ vm_map_trunc_page(map_addr,
+ VM_MAP_PAGE_MASK(map)),
+ vm_map_round_page(map_addr + map_size,
+ VM_MAP_PAGE_MASK(map)),
+ VM_PROT_DEFAULT, tag,
+ FALSE);
+
+ if (kr != KERN_SUCCESS) {
if (object == kernel_object) {
vm_object_lock(object);
vm_object_page_remove(object, offset, offset + map_size);
vm_object_unlock(object);
}
- vm_map_remove(map, vm_map_trunc_page(map_addr),
- vm_map_round_page(map_addr + map_size), 0);
+ vm_map_remove(map,
+ vm_map_trunc_page(map_addr,
+ VM_MAP_PAGE_MASK(map)),
+ vm_map_round_page(map_addr + map_size,
+ VM_MAP_PAGE_MASK(map)),
+ VM_MAP_REMOVE_NO_FLAGS);
vm_object_deallocate(object);
return kr;
}
vm_object_deallocate(object);
- if (object == kernel_object)
+ if (object == kernel_object) {
vm_map_simplify(map, map_addr);
+ vm_tag_update_size(tag, map_size);
+ }
+ *addrp = (vm_offset_t) map_addr;
+ assert((vm_map_offset_t) *addrp == map_addr);
- *addrp = map_addr;
return KERN_SUCCESS;
}
* 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
kernel_memory_allocate(
- register vm_map_t map,
- register vm_offset_t *addrp,
- register vm_size_t size,
- register vm_offset_t mask,
- int flags)
+ vm_map_t map,
+ vm_offset_t *addrp,
+ vm_size_t size,
+ vm_offset_t mask,
+ int flags,
+ vm_tag_t tag)
{
vm_object_t object;
vm_object_offset_t offset;
- vm_map_entry_t entry;
- vm_map_offset_t map_addr;
+ vm_object_offset_t pg_offset;
+ vm_map_entry_t entry = NULL;
+ vm_map_offset_t map_addr, fill_start;
vm_map_offset_t map_mask;
- vm_map_size_t map_size;
- vm_map_size_t i;
- kern_return_t kr;
+ vm_map_size_t map_size, fill_size;
+ kern_return_t kr, pe_result;
+ vm_page_t mem;
+ vm_page_t guard_page_list = NULL;
+ vm_page_t wired_page_list = NULL;
+ int guard_page_count = 0;
+ int wired_page_count = 0;
+ int page_grab_count = 0;
+ int i;
+ int vm_alloc_flags;
+ vm_map_kernel_flags_t vmk_flags;
+ vm_prot_t kma_prot;
+
+ if (! vm_kernel_ready) {
+ panic("kernel_memory_allocate: VM is not ready");
+ }
+
+ map_size = vm_map_round_page(size,
+ VM_MAP_PAGE_MASK(map));
+ map_mask = (vm_map_offset_t) mask;
- if (size == 0) {
+ vm_alloc_flags = 0; //VM_MAKE_TAG(tag);
+ vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
+
+ /* Check for zero allocation size (either directly or via overflow) */
+ if (map_size == 0) {
*addrp = 0;
return KERN_INVALID_ARGUMENT;
}
- map_size = vm_map_round_page(size);
- map_mask = (vm_map_offset_t) mask;
+ /*
+ * limit the size of a single extent of wired memory
+ * to try and limit the damage to the system if
+ * too many pages get wired down
+ * limit raised to 2GB with 128GB max physical limit,
+ * but scaled by installed memory above this
+ */
+ if (!(flags & (KMA_VAONLY | KMA_PAGEABLE)) &&
+ map_size > MAX(1ULL<<31, sane_size/64)) {
+ return KERN_RESOURCE_SHORTAGE;
+ }
+
+ /*
+ * 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) {
+ vmk_flags.vmkf_guard_before = TRUE;
+ 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;
+ }
+ guard_page_count++;
+ }
+ if (flags & KMA_GUARD_LAST) {
+ vmk_flags.vmkf_guard_after = TRUE;
+ fill_size -= PAGE_SIZE_64;
+ if (map_size <= fill_start + fill_size) {
+ /* no space for a guard page */
+ *addrp = 0;
+ return KERN_INVALID_ARGUMENT;
+ }
+ guard_page_count++;
+ }
+ wired_page_count = (int) (fill_size / PAGE_SIZE_64);
+ assert(wired_page_count * PAGE_SIZE_64 == fill_size);
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_START, size, 0, 0, 0);
+#endif
+
+ for (i = 0; i < guard_page_count; i++) {
+ for (;;) {
+ mem = vm_page_grab_guard();
+
+ if (mem != VM_PAGE_NULL)
+ break;
+ if (flags & KMA_NOPAGEWAIT) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ vm_page_more_fictitious();
+ }
+ mem->vmp_snext = guard_page_list;
+ guard_page_list = mem;
+ }
+
+ if (!(flags & (KMA_VAONLY | KMA_PAGEABLE))) {
+ for (i = 0; i < wired_page_count; i++) {
+ uint64_t unavailable;
+
+ for (;;) {
+ if (flags & KMA_LOMEM)
+ mem = vm_page_grablo();
+ else
+ mem = vm_page_grab();
+
+ if (mem != VM_PAGE_NULL)
+ break;
+
+ if (flags & KMA_NOPAGEWAIT) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ if ((flags & KMA_LOMEM) && (vm_lopage_needed == TRUE)) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ unavailable = (vm_page_wire_count + vm_page_free_target) * PAGE_SIZE;
+
+ if (unavailable > max_mem || map_size > (max_mem - unavailable)) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ VM_PAGE_WAIT();
+ }
+ page_grab_count++;
+ if (KMA_ZERO & flags) vm_page_zero_fill(mem);
+ mem->vmp_snext = wired_page_list;
+ wired_page_list = mem;
+ }
+ }
/*
* Allocate a new object (if necessary). We must do this before
if ((flags & KMA_KOBJECT) != 0) {
object = kernel_object;
vm_object_reference(object);
+ } else if ((flags & KMA_COMPRESSOR) != 0) {
+ object = compressor_object;
+ vm_object_reference(object);
} else {
object = vm_object_allocate(map_size);
}
- kr = vm_map_find_space(map, &map_addr, map_size, map_mask, &entry);
+ if (flags & KMA_ATOMIC)
+ vmk_flags.vmkf_atomic_entry = TRUE;
+
+ kr = vm_map_find_space(map, &map_addr,
+ fill_size, map_mask,
+ vm_alloc_flags, vmk_flags, tag, &entry);
if (KERN_SUCCESS != kr) {
vm_object_deallocate(object);
- return kr;
+ goto out;
}
- entry->object.vm_object = object;
- entry->offset = offset = (object == kernel_object) ?
- map_addr - VM_MIN_KERNEL_ADDRESS : 0;
+ if (object == kernel_object || object == compressor_object) {
+ offset = map_addr;
+ } else {
+ offset = 0;
+ }
+ VME_OBJECT_SET(entry, object);
+ VME_OFFSET_SET(entry, offset);
+
+ if (!(flags & (KMA_COMPRESSOR | KMA_PAGEABLE)))
+ entry->wired_count++;
- vm_object_reference(object);
- vm_map_unlock(map);
+ if (flags & KMA_PERMANENT)
+ entry->permanent = TRUE;
+
+ if (object != kernel_object && object != compressor_object)
+ vm_object_reference(object);
vm_object_lock(object);
- for (i = 0; i < map_size; i += PAGE_SIZE) {
- vm_page_t mem;
+ vm_map_unlock(map);
- while (VM_PAGE_NULL ==
- (mem = vm_page_alloc(object, offset + i))) {
- 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;
- }
+ pg_offset = 0;
+
+ if (fill_start) {
+ if (guard_page_list == NULL)
+ panic("kernel_memory_allocate: guard_page_list == NULL");
+
+ mem = guard_page_list;
+ guard_page_list = mem->vmp_snext;
+ mem->vmp_snext = NULL;
+
+ vm_page_insert(mem, object, offset + pg_offset);
+
+ mem->vmp_busy = FALSE;
+ pg_offset += PAGE_SIZE_64;
+ }
+
+ kma_prot = VM_PROT_READ | VM_PROT_WRITE;
+
+#if KASAN
+ if (!(flags & KMA_VAONLY)) {
+ /* for VAONLY mappings we notify in populate only */
+ kasan_notify_address(map_addr, size);
+ }
+#endif
+
+ if (flags & (KMA_VAONLY | KMA_PAGEABLE)) {
+ pg_offset = fill_start + fill_size;
+ } else {
+ for (pg_offset = fill_start; pg_offset < fill_start + fill_size; pg_offset += PAGE_SIZE_64) {
+ if (wired_page_list == NULL)
+ panic("kernel_memory_allocate: wired_page_list == NULL");
+
+ mem = wired_page_list;
+ wired_page_list = mem->vmp_snext;
+ mem->vmp_snext = NULL;
+
+ assert(mem->vmp_wire_count == 0);
+ assert(mem->vmp_q_state == VM_PAGE_NOT_ON_Q);
+
+ mem->vmp_q_state = VM_PAGE_IS_WIRED;
+ mem->vmp_wire_count++;
+ if (__improbable(mem->vmp_wire_count == 0)) {
+ panic("kernel_memory_allocate(%p): wire_count overflow",
+ mem);
+ }
+
+ vm_page_insert_wired(mem, object, offset + pg_offset, tag);
+
+ mem->vmp_busy = FALSE;
+ mem->vmp_pmapped = TRUE;
+ mem->vmp_wpmapped = TRUE;
+
+ PMAP_ENTER_OPTIONS(kernel_pmap, map_addr + pg_offset, mem,
+ kma_prot, VM_PROT_NONE, ((flags & KMA_KSTACK) ? VM_MEM_STACK : 0), TRUE,
+ PMAP_OPTIONS_NOWAIT, pe_result);
+
+ if (pe_result == KERN_RESOURCE_SHORTAGE) {
vm_object_unlock(object);
- VM_PAGE_WAIT();
+
+ PMAP_ENTER(kernel_pmap, map_addr + pg_offset, mem,
+ kma_prot, VM_PROT_NONE, ((flags & KMA_KSTACK) ? VM_MEM_STACK : 0), TRUE,
+ pe_result);
+
vm_object_lock(object);
}
- 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);
- vm_object_unlock(object);
+ assert(pe_result == KERN_SUCCESS);
+
+ if (flags & KMA_NOENCRYPT) {
+ bzero(CAST_DOWN(void *, (map_addr + pg_offset)), PAGE_SIZE);
+
+ pmap_set_noencrypt(VM_PAGE_GET_PHYS_PAGE(mem));
}
- vm_map_remove(map, map_addr, map_addr + map_size, 0);
- vm_object_deallocate(object);
- return (kr);
}
- /* now that the page is wired, we no longer have to fear coalesce */
- vm_object_deallocate(object);
- if (object == kernel_object)
+ if (kernel_object == object) vm_tag_update_size(tag, fill_size);
+ }
+ if ((fill_start + fill_size) < map_size) {
+ if (guard_page_list == NULL)
+ panic("kernel_memory_allocate: guard_page_list == NULL");
+
+ mem = guard_page_list;
+ guard_page_list = mem->vmp_snext;
+ mem->vmp_snext = NULL;
+
+ vm_page_insert(mem, object, offset + pg_offset);
+
+ mem->vmp_busy = FALSE;
+ }
+ if (guard_page_list || wired_page_list)
+ panic("kernel_memory_allocate: non empty list\n");
+
+ if (!(flags & (KMA_VAONLY | KMA_PAGEABLE))) {
+ vm_page_lockspin_queues();
+ vm_page_wire_count += wired_page_count;
+ vm_page_unlock_queues();
+ }
+
+ vm_object_unlock(object);
+
+ /*
+ * now that the pages are wired, we no longer have to fear coalesce
+ */
+ if (object == kernel_object || object == compressor_object)
vm_map_simplify(map, map_addr);
+ else
+ vm_object_deallocate(object);
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0);
+#endif
/*
* Return the memory, not zeroed.
*/
*addrp = CAST_DOWN(vm_offset_t, map_addr);
return KERN_SUCCESS;
+
+out:
+ if (guard_page_list)
+ vm_page_free_list(guard_page_list, FALSE);
+
+ if (wired_page_list)
+ vm_page_free_list(wired_page_list, FALSE);
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0);
+#endif
+
+ return kr;
+}
+
+kern_return_t
+kernel_memory_populate(
+ vm_map_t map,
+ vm_offset_t addr,
+ vm_size_t size,
+ int flags,
+ vm_tag_t tag)
+{
+ vm_object_t object;
+ vm_object_offset_t offset, pg_offset;
+ kern_return_t kr, pe_result;
+ vm_page_t mem;
+ vm_page_t page_list = NULL;
+ int page_count = 0;
+ int page_grab_count = 0;
+ int i;
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_START, size, 0, 0, 0);
+#endif
+
+ page_count = (int) (size / PAGE_SIZE_64);
+
+ assert((flags & (KMA_COMPRESSOR|KMA_KOBJECT)) != (KMA_COMPRESSOR|KMA_KOBJECT));
+
+ if (flags & KMA_COMPRESSOR) {
+
+ pg_offset = page_count * PAGE_SIZE_64;
+
+ do {
+ for (;;) {
+ mem = vm_page_grab();
+
+ if (mem != VM_PAGE_NULL)
+ break;
+
+ VM_PAGE_WAIT();
+ }
+ page_grab_count++;
+ if (KMA_ZERO & flags) vm_page_zero_fill(mem);
+ mem->vmp_snext = page_list;
+ page_list = mem;
+
+ pg_offset -= PAGE_SIZE_64;
+
+ kr = pmap_enter_options(kernel_pmap,
+ addr + pg_offset, VM_PAGE_GET_PHYS_PAGE(mem),
+ VM_PROT_READ | VM_PROT_WRITE, VM_PROT_NONE, 0, TRUE,
+ PMAP_OPTIONS_INTERNAL, NULL);
+ assert(kr == KERN_SUCCESS);
+
+ } while (pg_offset);
+
+ offset = addr;
+ object = compressor_object;
+
+ vm_object_lock(object);
+
+ for (pg_offset = 0;
+ pg_offset < size;
+ pg_offset += PAGE_SIZE_64) {
+
+ mem = page_list;
+ page_list = mem->vmp_snext;
+ mem->vmp_snext = NULL;
+
+ vm_page_insert(mem, object, offset + pg_offset);
+ assert(mem->vmp_busy);
+
+ mem->vmp_busy = FALSE;
+ mem->vmp_pmapped = TRUE;
+ mem->vmp_wpmapped = TRUE;
+ mem->vmp_q_state = VM_PAGE_USED_BY_COMPRESSOR;
+ }
+ vm_object_unlock(object);
+
+#if KASAN
+ if (map == compressor_map) {
+ kasan_notify_address_nopoison(addr, size);
+ } else {
+ kasan_notify_address(addr, size);
+ }
+#endif
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0);
+#endif
+ return KERN_SUCCESS;
+ }
+
+ for (i = 0; i < page_count; i++) {
+ for (;;) {
+ if (flags & KMA_LOMEM)
+ mem = vm_page_grablo();
+ else
+ mem = vm_page_grab();
+
+ if (mem != VM_PAGE_NULL)
+ break;
+
+ if (flags & KMA_NOPAGEWAIT) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ if ((flags & KMA_LOMEM) &&
+ (vm_lopage_needed == TRUE)) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ goto out;
+ }
+ VM_PAGE_WAIT();
+ }
+ page_grab_count++;
+ if (KMA_ZERO & flags) vm_page_zero_fill(mem);
+ mem->vmp_snext = page_list;
+ page_list = mem;
+ }
+ if (flags & KMA_KOBJECT) {
+ offset = addr;
+ object = kernel_object;
+
+ vm_object_lock(object);
+ } else {
+ /*
+ * If it's not the kernel object, we need to:
+ * lock map;
+ * lookup entry;
+ * lock object;
+ * take reference on object;
+ * unlock map;
+ */
+ panic("kernel_memory_populate(%p,0x%llx,0x%llx,0x%x): "
+ "!KMA_KOBJECT",
+ map, (uint64_t) addr, (uint64_t) size, flags);
+ }
+
+ for (pg_offset = 0;
+ pg_offset < size;
+ pg_offset += PAGE_SIZE_64) {
+
+ if (page_list == NULL)
+ panic("kernel_memory_populate: page_list == NULL");
+
+ mem = page_list;
+ page_list = mem->vmp_snext;
+ mem->vmp_snext = NULL;
+
+ assert(mem->vmp_q_state == VM_PAGE_NOT_ON_Q);
+ mem->vmp_q_state = VM_PAGE_IS_WIRED;
+ mem->vmp_wire_count++;
+ if (__improbable(mem->vmp_wire_count == 0)) {
+ panic("kernel_memory_populate(%p): wire_count overflow", mem);
+ }
+
+ vm_page_insert_wired(mem, object, offset + pg_offset, tag);
+
+ mem->vmp_busy = FALSE;
+ mem->vmp_pmapped = TRUE;
+ mem->vmp_wpmapped = TRUE;
+
+ PMAP_ENTER_OPTIONS(kernel_pmap, addr + pg_offset, mem,
+ VM_PROT_READ | VM_PROT_WRITE, VM_PROT_NONE,
+ ((flags & KMA_KSTACK) ? VM_MEM_STACK : 0), TRUE,
+ PMAP_OPTIONS_NOWAIT, pe_result);
+
+ if (pe_result == KERN_RESOURCE_SHORTAGE) {
+
+ vm_object_unlock(object);
+
+ PMAP_ENTER(kernel_pmap, addr + pg_offset, mem,
+ VM_PROT_READ | VM_PROT_WRITE, VM_PROT_NONE,
+ ((flags & KMA_KSTACK) ? VM_MEM_STACK : 0), TRUE,
+ pe_result);
+
+ vm_object_lock(object);
+ }
+
+ assert(pe_result == KERN_SUCCESS);
+
+ if (flags & KMA_NOENCRYPT) {
+ bzero(CAST_DOWN(void *, (addr + pg_offset)), PAGE_SIZE);
+ pmap_set_noencrypt(VM_PAGE_GET_PHYS_PAGE(mem));
+ }
+ }
+ vm_page_lockspin_queues();
+ vm_page_wire_count += page_count;
+ vm_page_unlock_queues();
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0);
+#endif
+
+ if (kernel_object == object) vm_tag_update_size(tag, size);
+
+ vm_object_unlock(object);
+
+#if KASAN
+ if (map == compressor_map) {
+ kasan_notify_address_nopoison(addr, size);
+ } else {
+ kasan_notify_address(addr, size);
+ }
+#endif
+ return KERN_SUCCESS;
+
+out:
+ if (page_list)
+ vm_page_free_list(page_list, FALSE);
+
+#if DEBUG || DEVELOPMENT
+ VM_DEBUG_CONSTANT_EVENT(vm_kern_request, VM_KERN_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0);
+#endif
+
+ return kr;
+}
+
+
+void
+kernel_memory_depopulate(
+ vm_map_t map,
+ vm_offset_t addr,
+ vm_size_t size,
+ int flags)
+{
+ vm_object_t object;
+ vm_object_offset_t offset, pg_offset;
+ vm_page_t mem;
+ vm_page_t local_freeq = NULL;
+
+ assert((flags & (KMA_COMPRESSOR|KMA_KOBJECT)) != (KMA_COMPRESSOR|KMA_KOBJECT));
+
+ if (flags & KMA_COMPRESSOR) {
+ offset = addr;
+ object = compressor_object;
+
+ vm_object_lock(object);
+ } else if (flags & KMA_KOBJECT) {
+ offset = addr;
+ object = kernel_object;
+ vm_object_lock(object);
+ } else {
+ offset = 0;
+ object = NULL;
+ /*
+ * If it's not the kernel object, we need to:
+ * lock map;
+ * lookup entry;
+ * lock object;
+ * unlock map;
+ */
+ panic("kernel_memory_depopulate(%p,0x%llx,0x%llx,0x%x): "
+ "!KMA_KOBJECT",
+ map, (uint64_t) addr, (uint64_t) size, flags);
+ }
+ pmap_protect(kernel_map->pmap, offset, offset + size, VM_PROT_NONE);
+
+ for (pg_offset = 0;
+ pg_offset < size;
+ pg_offset += PAGE_SIZE_64) {
+
+ mem = vm_page_lookup(object, offset + pg_offset);
+
+ assert(mem);
+
+ if (mem->vmp_q_state != VM_PAGE_USED_BY_COMPRESSOR)
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(mem));
+
+ mem->vmp_busy = TRUE;
+
+ assert(mem->vmp_tabled);
+ vm_page_remove(mem, TRUE);
+ assert(mem->vmp_busy);
+
+ assert(mem->vmp_pageq.next == 0 && mem->vmp_pageq.prev == 0);
+ assert((mem->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) ||
+ (mem->vmp_q_state == VM_PAGE_NOT_ON_Q));
+
+ mem->vmp_q_state = VM_PAGE_NOT_ON_Q;
+ mem->vmp_snext = local_freeq;
+ local_freeq = mem;
+ }
+ vm_object_unlock(object);
+
+ if (local_freeq)
+ vm_page_free_list(local_freeq, TRUE);
}
/*
*/
kern_return_t
-kmem_alloc(
+kmem_alloc_external(
vm_map_t map,
vm_offset_t *addrp,
vm_size_t size)
{
- return kernel_memory_allocate(map, addrp, size, 0, 0);
+ return (kmem_alloc(map, addrp, size, vm_tag_bt()));
+}
+
+
+kern_return_t
+kmem_alloc(
+ vm_map_t map,
+ vm_offset_t *addrp,
+ vm_size_t size,
+ vm_tag_t tag)
+{
+ return kmem_alloc_flags(map, addrp, size, tag, 0);
+}
+
+kern_return_t
+kmem_alloc_flags(
+ vm_map_t map,
+ vm_offset_t *addrp,
+ vm_size_t size,
+ vm_tag_t tag,
+ int flags)
+{
+ kern_return_t kr = kernel_memory_allocate(map, addrp, size, 0, flags, tag);
+ TRACE_MACHLEAKS(KMEM_ALLOC_CODE, KMEM_ALLOC_CODE_2, size, *addrp);
+ return kr;
}
/*
vm_offset_t oldaddr,
vm_size_t oldsize,
vm_offset_t *newaddrp,
- vm_size_t newsize)
+ vm_size_t newsize,
+ vm_tag_t tag)
{
vm_object_t object;
vm_object_offset_t offset;
vm_page_t mem;
kern_return_t kr;
- oldmapmin = vm_map_trunc_page(oldaddr);
- oldmapmax = vm_map_round_page(oldaddr + oldsize);
+ oldmapmin = vm_map_trunc_page(oldaddr,
+ VM_MAP_PAGE_MASK(map));
+ oldmapmax = vm_map_round_page(oldaddr + oldsize,
+ VM_MAP_PAGE_MASK(map));
oldmapsize = oldmapmax - oldmapmin;
- newmapsize = vm_map_round_page(newsize);
-
+ newmapsize = vm_map_round_page(newsize,
+ VM_MAP_PAGE_MASK(map));
+ if (newmapsize < newsize) {
+ /* overflow */
+ *newaddrp = 0;
+ return KERN_INVALID_ARGUMENT;
+ }
/*
* Find the VM object backing the old region.
if (!vm_map_lookup_entry(map, oldmapmin, &oldentry))
panic("kmem_realloc");
- object = oldentry->object.vm_object;
+ object = VME_OBJECT(oldentry);
/*
* Increase the size of the object and
/* attempt is made to realloc a kmem_alloc'd area */
vm_object_lock(object);
vm_map_unlock(map);
- if (object->size != oldmapsize)
+ if (object->vo_size != oldmapsize)
panic("kmem_realloc");
- object->size = newmapsize;
+ object->vo_size = newmapsize;
vm_object_unlock(object);
/* allocate the new pages while expanded portion of the */
*/
kr = vm_map_find_space(map, &newmapaddr, newmapsize,
- (vm_map_offset_t) 0, &newentry);
+ (vm_map_offset_t) 0, 0,
+ VM_MAP_KERNEL_FLAGS_NONE,
+ tag,
+ &newentry);
if (kr != KERN_SUCCESS) {
vm_object_lock(object);
for(offset = oldmapsize;
offset < newmapsize; offset += PAGE_SIZE) {
if ((mem = vm_page_lookup(object, offset)) != VM_PAGE_NULL) {
- vm_page_lock_queues();
- vm_page_free(mem);
- vm_page_unlock_queues();
+ VM_PAGE_FREE(mem);
}
}
- object->size = oldmapsize;
+ object->vo_size = oldmapsize;
vm_object_unlock(object);
vm_object_deallocate(object);
return kr;
}
- newentry->object.vm_object = object;
- newentry->offset = 0;
- assert (newentry->wired_count == 0);
+ VME_OBJECT_SET(newentry, object);
+ VME_OFFSET_SET(newentry, 0);
+ assert(newentry->wired_count == 0);
/* add an extra reference in case we have someone doing an */
vm_object_reference(object);
vm_map_unlock(map);
- kr = vm_map_wire(map, newmapaddr, newmapaddr + newmapsize, VM_PROT_DEFAULT, FALSE);
+ kr = vm_map_wire_kernel(map, newmapaddr, newmapaddr + newmapsize,
+ VM_PROT_DEFAULT, tag, FALSE);
if (KERN_SUCCESS != kr) {
- vm_map_remove(map, newmapaddr, newmapaddr + newmapsize, 0);
+ vm_map_remove(map, newmapaddr, newmapaddr + newmapsize, VM_MAP_REMOVE_NO_FLAGS);
vm_object_lock(object);
for(offset = oldsize; offset < newmapsize; offset += PAGE_SIZE) {
if ((mem = vm_page_lookup(object, offset)) != VM_PAGE_NULL) {
- vm_page_lock_queues();
- vm_page_free(mem);
- vm_page_unlock_queues();
+ VM_PAGE_FREE(mem);
}
}
- object->size = oldmapsize;
+ object->vo_size = oldmapsize;
vm_object_unlock(object);
vm_object_deallocate(object);
return (kr);
}
vm_object_deallocate(object);
+ if (kernel_object == object) vm_tag_update_size(tag, newmapsize);
+
*newaddrp = CAST_DOWN(vm_offset_t, newmapaddr);
return KERN_SUCCESS;
}
/*
- * kmem_alloc_wired:
+ * kmem_alloc_kobject:
*
* Allocate wired-down memory in the kernel's address map
* or a submap. The memory is not zero-filled.
*/
kern_return_t
-kmem_alloc_wired(
+kmem_alloc_kobject_external(
vm_map_t map,
vm_offset_t *addrp,
vm_size_t size)
{
- return kernel_memory_allocate(map, addrp, size, 0, KMA_KOBJECT);
+ return (kmem_alloc_kobject(map, addrp, size, vm_tag_bt()));
+}
+
+kern_return_t
+kmem_alloc_kobject(
+ vm_map_t map,
+ vm_offset_t *addrp,
+ vm_size_t size,
+ vm_tag_t tag)
+{
+ return kernel_memory_allocate(map, addrp, size, 0, KMA_KOBJECT, tag);
}
/*
* kmem_alloc_aligned:
*
- * Like kmem_alloc_wired, except that the memory is aligned.
+ * Like kmem_alloc_kobject, except that the memory is aligned.
* The size should be a power-of-2.
*/
kmem_alloc_aligned(
vm_map_t map,
vm_offset_t *addrp,
- vm_size_t size)
+ vm_size_t size,
+ vm_tag_t tag)
{
if ((size & (size - 1)) != 0)
panic("kmem_alloc_aligned: size not aligned");
- return kernel_memory_allocate(map, addrp, size, size - 1, KMA_KOBJECT);
+ return kernel_memory_allocate(map, addrp, size, size - 1, KMA_KOBJECT, tag);
}
/*
*/
kern_return_t
-kmem_alloc_pageable(
+kmem_alloc_pageable_external(
vm_map_t map,
vm_offset_t *addrp,
vm_size_t size)
+{
+ return (kmem_alloc_pageable(map, addrp, size, vm_tag_bt()));
+}
+
+kern_return_t
+kmem_alloc_pageable(
+ vm_map_t map,
+ vm_offset_t *addrp,
+ vm_size_t size,
+ vm_tag_t tag)
{
vm_map_offset_t map_addr;
vm_map_size_t map_size;
kern_return_t kr;
#ifndef normal
- map_addr = (vm_map_min(map)) + 0x1000;
+ map_addr = (vm_map_min(map)) + PAGE_SIZE;
#else
map_addr = vm_map_min(map);
#endif
- map_size = vm_map_round_page(size);
+ map_size = vm_map_round_page(size,
+ VM_MAP_PAGE_MASK(map));
+ if (map_size < size) {
+ /* overflow */
+ *addrp = 0;
+ return KERN_INVALID_ARGUMENT;
+ }
kr = vm_map_enter(map, &map_addr, map_size,
- (vm_map_offset_t) 0, VM_FLAGS_ANYWHERE,
+ (vm_map_offset_t) 0,
+ VM_FLAGS_ANYWHERE,
+ VM_MAP_KERNEL_FLAGS_NONE,
+ tag,
VM_OBJECT_NULL, (vm_object_offset_t) 0, FALSE,
VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
if (kr != KERN_SUCCESS)
return kr;
+#if KASAN
+ kasan_notify_address(map_addr, map_size);
+#endif
*addrp = CAST_DOWN(vm_offset_t, map_addr);
return KERN_SUCCESS;
}
* kmem_free:
*
* Release a region of kernel virtual memory allocated
- * with kmem_alloc, kmem_alloc_wired, or kmem_alloc_pageable,
+ * with kmem_alloc, kmem_alloc_kobject, or kmem_alloc_pageable,
* and return the physical pages associated with that region.
*/
{
kern_return_t kr;
- kr = vm_map_remove(map, vm_map_trunc_page(addr),
- vm_map_round_page(addr + size),
- VM_MAP_REMOVE_KUNWIRE);
+ assert(addr >= VM_MIN_KERNEL_AND_KEXT_ADDRESS);
+
+ TRACE_MACHLEAKS(KMEM_FREE_CODE, KMEM_FREE_CODE_2, size, addr);
+
+ if(size == 0) {
+#if MACH_ASSERT
+ printf("kmem_free called with size==0 for map: %p with addr: 0x%llx\n",map,(uint64_t)addr);
+#endif
+ return;
+ }
+
+ kr = vm_map_remove(map,
+ vm_map_trunc_page(addr,
+ VM_MAP_PAGE_MASK(map)),
+ vm_map_round_page(addr + size,
+ VM_MAP_PAGE_MASK(map)),
+ VM_MAP_REMOVE_KUNWIRE);
if (kr != KERN_SUCCESS)
panic("kmem_free");
}
kern_return_t
kmem_alloc_pages(
- register vm_object_t object,
- register vm_object_offset_t offset,
- register vm_object_size_t size)
+ vm_object_t object,
+ vm_object_offset_t offset,
+ vm_object_size_t size)
{
vm_object_size_t alloc_size;
alloc_size = vm_object_round_page(size);
vm_object_lock(object);
while (alloc_size) {
- register vm_page_t mem;
+ vm_page_t mem;
/*
VM_PAGE_WAIT();
vm_object_lock(object);
}
- mem->busy = FALSE;
+ mem->vmp_busy = FALSE;
alloc_size -= PAGE_SIZE;
offset += PAGE_SIZE;
return KERN_SUCCESS;
}
-/*
- * Remap wired pages in an object into a new region.
- * The object is assumed to be mapped into the kernel map or
- * a submap.
- */
-void
-kmem_remap_pages(
- register vm_object_t object,
- register vm_object_offset_t offset,
- register vm_offset_t start,
- 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.
- */
- map_start = vm_map_trunc_page(start);
- map_end = vm_map_round_page(end);
-
- pmap_pageable(kernel_pmap, map_start, map_end, FALSE);
-
- while (map_start < map_end) {
- register vm_page_t mem;
-
- vm_object_lock(object);
-
- /*
- * Find a page
- */
- if ((mem = vm_page_lookup(object, offset)) == VM_PAGE_NULL)
- panic("kmem_remap_pages");
-
- /*
- * Wire it down (again)
- */
- vm_page_lock_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, map_start, mem, protection,
- ((unsigned int)(mem->object->wimg_bits))
- & VM_WIMG_MASK,
- TRUE);
-
- map_start += PAGE_SIZE;
- offset += PAGE_SIZE;
- }
-}
-
/*
* kmem_suballoc:
*
vm_size_t size,
boolean_t pageable,
int flags,
+ vm_map_kernel_flags_t vmk_flags,
+ vm_tag_t tag,
vm_map_t *new_map)
{
vm_map_t map;
vm_map_size_t map_size;
kern_return_t kr;
- map_size = vm_map_round_page(size);
+ map_size = vm_map_round_page(size,
+ VM_MAP_PAGE_MASK(parent));
+ if (map_size < size) {
+ /* overflow */
+ *addr = 0;
+ return KERN_INVALID_ARGUMENT;
+ }
/*
* Need reference on submap object because it is internal
*/
vm_object_reference(vm_submap_object);
- map_addr = (flags & VM_FLAGS_ANYWHERE) ?
- vm_map_min(parent) : vm_map_trunc_page(*addr);
+ map_addr = ((flags & VM_FLAGS_ANYWHERE)
+ ? vm_map_min(parent)
+ : vm_map_trunc_page(*addr,
+ VM_MAP_PAGE_MASK(parent)));
kr = vm_map_enter(parent, &map_addr, map_size,
- (vm_map_offset_t) 0, flags,
+ (vm_map_offset_t) 0, flags, vmk_flags, tag,
vm_submap_object, (vm_object_offset_t) 0, FALSE,
VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
if (kr != KERN_SUCCESS) {
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" */
+ /* inherit the parent map's page size */
+ vm_map_set_page_shift(map, VM_MAP_PAGE_SHIFT(parent));
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, map_addr, map_addr + map_size, VM_MAP_NO_FLAGS);
+ vm_map_remove(parent, map_addr, map_addr + map_size,
+ VM_MAP_REMOVE_NO_FLAGS);
vm_map_deallocate(map); /* also removes ref to pmap */
vm_object_deallocate(vm_submap_object);
return (kr);
{
vm_map_offset_t map_start;
vm_map_offset_t map_end;
+ vm_map_kernel_flags_t vmk_flags;
- map_start = vm_map_trunc_page(start);
- map_end = vm_map_round_page(end);
+ vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
+ vmk_flags.vmkf_permanent = TRUE;
+ vmk_flags.vmkf_no_pmap_check = TRUE;
- kernel_map = vm_map_create(pmap_kernel(),VM_MIN_KERNEL_ADDRESS,
- map_end, FALSE);
+ map_start = vm_map_trunc_page(start,
+ VM_MAP_PAGE_MASK(kernel_map));
+ map_end = vm_map_round_page(end,
+ VM_MAP_PAGE_MASK(kernel_map));
+#if defined(__arm__) || defined(__arm64__)
+ kernel_map = vm_map_create(pmap_kernel(),VM_MIN_KERNEL_AND_KEXT_ADDRESS,
+ VM_MAX_KERNEL_ADDRESS, FALSE);
/*
* Reserve virtual memory allocated up to this time.
*/
-
- if (start != VM_MIN_KERNEL_ADDRESS) {
+ {
+ unsigned int region_select = 0;
+ vm_map_offset_t region_start;
+ vm_map_size_t region_size;
vm_map_offset_t map_addr;
+ kern_return_t kr;
+
+ while (pmap_virtual_region(region_select, ®ion_start, ®ion_size)) {
+
+ map_addr = region_start;
+ kr = vm_map_enter(kernel_map, &map_addr,
+ vm_map_round_page(region_size,
+ VM_MAP_PAGE_MASK(kernel_map)),
+ (vm_map_offset_t) 0,
+ VM_FLAGS_FIXED,
+ vmk_flags,
+ VM_KERN_MEMORY_NONE,
+ VM_OBJECT_NULL,
+ (vm_object_offset_t) 0, FALSE, VM_PROT_NONE, VM_PROT_NONE,
+ VM_INHERIT_DEFAULT);
+
+ if (kr != KERN_SUCCESS) {
+ panic("kmem_init(0x%llx,0x%llx): vm_map_enter(0x%llx,0x%llx) error 0x%x\n",
+ (uint64_t) start, (uint64_t) end, (uint64_t) region_start,
+ (uint64_t) region_size, kr);
+ }
+
+ region_select++;
+ }
+ }
+#else
+ kernel_map = vm_map_create(pmap_kernel(),VM_MIN_KERNEL_AND_KEXT_ADDRESS,
+ map_end, FALSE);
+ /*
+ * Reserve virtual memory allocated up to this time.
+ */
+ if (start != VM_MIN_KERNEL_AND_KEXT_ADDRESS) {
+ vm_map_offset_t map_addr;
+ kern_return_t kr;
+
+ vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
+ vmk_flags.vmkf_no_pmap_check = TRUE;
+
+ map_addr = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
+ kr = vm_map_enter(kernel_map,
+ &map_addr,
+ (vm_map_size_t)(map_start - VM_MIN_KERNEL_AND_KEXT_ADDRESS),
+ (vm_map_offset_t) 0,
+ VM_FLAGS_FIXED,
+ vmk_flags,
+ VM_KERN_MEMORY_NONE,
+ VM_OBJECT_NULL,
+ (vm_object_offset_t) 0, FALSE,
+ VM_PROT_NONE, VM_PROT_NONE,
+ VM_INHERIT_DEFAULT);
+
+ if (kr != KERN_SUCCESS) {
+ panic("kmem_init(0x%llx,0x%llx): vm_map_enter(0x%llx,0x%llx) error 0x%x\n",
+ (uint64_t) start, (uint64_t) end,
+ (uint64_t) VM_MIN_KERNEL_AND_KEXT_ADDRESS,
+ (uint64_t) (map_start - VM_MIN_KERNEL_AND_KEXT_ADDRESS),
+ kr);
+ }
+ }
+#endif
- map_addr = VM_MIN_KERNEL_ADDRESS;
- (void) vm_map_enter(kernel_map,
- &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_DEFAULT, VM_PROT_ALL,
- VM_INHERIT_DEFAULT);
- }
-
- /*
- * Account for kernel memory (text, data, bss, vm shenanigans).
- * This may include inaccessible "holes" as determined by what
- * the machine-dependent init code includes in max_mem.
- */
- 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
+ * amount of memory that are potentially usable by a user app (max_mem)
+ * minus a certain amount. This can be overridden via a sysctl.
+ */
+ vm_global_no_user_wire_amount = MIN(max_mem*20/100,
+ VM_NOT_USER_WIREABLE);
+ vm_global_user_wire_limit = max_mem - vm_global_no_user_wire_amount;
+
+ /* the default per user limit is the same as the global limit */
+ vm_user_wire_limit = vm_global_user_wire_limit;
}
return KERN_SUCCESS;
}
+/*
+ *
+ * The following two functions are to be used when exposing kernel
+ * addresses to userspace via any of the various debug or info
+ * facilities that exist. These are basically the same as VM_KERNEL_ADDRPERM()
+ * and VM_KERNEL_UNSLIDE_OR_PERM() except they use a different random seed and
+ * are exported to KEXTs.
+ *
+ * NOTE: USE THE MACRO VERSIONS OF THESE FUNCTIONS (in vm_param.h) FROM WITHIN THE KERNEL
+ */
-kern_return_t
-vm_conflict_check(
- vm_map_t map,
- vm_map_offset_t off,
- vm_map_size_t len,
- memory_object_t pager,
- vm_object_offset_t file_off)
+static void
+vm_kernel_addrhash_internal(
+ vm_offset_t addr,
+ vm_offset_t *hash_addr,
+ uint64_t salt)
{
- vm_map_entry_t entry;
- vm_object_t obj;
- vm_object_offset_t obj_off;
- vm_map_t base_map;
- vm_map_offset_t base_offset;
- vm_map_offset_t original_offset;
- kern_return_t kr;
- vm_map_size_t local_len;
+ assert(salt != 0);
- base_map = map;
- base_offset = off;
- original_offset = off;
- kr = KERN_SUCCESS;
- vm_map_lock(map);
- while(vm_map_lookup_entry(map, off, &entry)) {
- local_len = len;
+ if (addr == 0) {
+ *hash_addr = 0;
+ return;
+ }
- if (entry->object.vm_object == VM_OBJECT_NULL) {
- vm_map_unlock(map);
- return KERN_SUCCESS;
- }
- if (entry->is_sub_map) {
- vm_map_t old_map;
-
- old_map = map;
- vm_map_lock(entry->object.sub_map);
- map = entry->object.sub_map;
- off = entry->offset + (off - entry->vme_start);
- vm_map_unlock(old_map);
- continue;
- }
- obj = entry->object.vm_object;
- obj_off = (off - entry->vme_start) + entry->offset;
- while(obj->shadow) {
- obj_off += obj->shadow_offset;
- obj = obj->shadow;
- }
- if((obj->pager_created) && (obj->pager == pager)) {
- if(((obj->paging_offset) + obj_off) == file_off) {
- if(off != base_offset) {
- vm_map_unlock(map);
- return KERN_FAILURE;
- }
- kr = KERN_ALREADY_WAITING;
- } else {
- vm_object_offset_t obj_off_aligned;
- vm_object_offset_t file_off_aligned;
-
- obj_off_aligned = obj_off & ~PAGE_MASK;
- file_off_aligned = file_off & ~PAGE_MASK;
-
- if (file_off_aligned == (obj->paging_offset + obj_off_aligned)) {
- /*
- * the target map and the file offset start in the same page
- * but are not identical...
- */
- vm_map_unlock(map);
- return KERN_FAILURE;
- }
- if ((file_off < (obj->paging_offset + obj_off_aligned)) &&
- ((file_off + len) > (obj->paging_offset + obj_off_aligned))) {
- /*
- * some portion of the tail of the I/O will fall
- * within the encompass of the target map
- */
- vm_map_unlock(map);
- return KERN_FAILURE;
- }
- if ((file_off_aligned > (obj->paging_offset + obj_off)) &&
- (file_off_aligned < (obj->paging_offset + obj_off) + len)) {
- /*
- * the beginning page of the file offset falls within
- * the target map's encompass
- */
- vm_map_unlock(map);
- return KERN_FAILURE;
- }
- }
- } else if(kr != KERN_SUCCESS) {
- vm_map_unlock(map);
- return KERN_FAILURE;
- }
+ if (VM_KERNEL_IS_SLID(addr)) {
+ *hash_addr = VM_KERNEL_UNSLIDE(addr);
+ return;
+ }
- if(len <= ((entry->vme_end - entry->vme_start) -
- (off - entry->vme_start))) {
- vm_map_unlock(map);
- return kr;
- } else {
- len -= (entry->vme_end - entry->vme_start) -
- (off - entry->vme_start);
- }
- base_offset = base_offset + (local_len - len);
- file_off = file_off + (local_len - len);
- off = base_offset;
- if(map != base_map) {
- vm_map_unlock(map);
- vm_map_lock(base_map);
- map = base_map;
- }
+ vm_offset_t sha_digest[SHA256_DIGEST_LENGTH/sizeof(vm_offset_t)];
+ SHA256_CTX sha_ctx;
+
+ SHA256_Init(&sha_ctx);
+ SHA256_Update(&sha_ctx, &salt, sizeof(salt));
+ SHA256_Update(&sha_ctx, &addr, sizeof(addr));
+ SHA256_Final(sha_digest, &sha_ctx);
+
+ *hash_addr = sha_digest[0];
+}
+
+void
+vm_kernel_addrhash_external(
+ vm_offset_t addr,
+ vm_offset_t *hash_addr)
+{
+ return vm_kernel_addrhash_internal(addr, hash_addr, vm_kernel_addrhash_salt_ext);
+}
+
+vm_offset_t
+vm_kernel_addrhash(vm_offset_t addr)
+{
+ vm_offset_t hash_addr;
+ vm_kernel_addrhash_internal(addr, &hash_addr, vm_kernel_addrhash_salt);
+ return hash_addr;
+}
+
+void
+vm_kernel_addrhide(
+ vm_offset_t addr,
+ vm_offset_t *hide_addr)
+{
+ *hide_addr = VM_KERNEL_ADDRHIDE(addr);
+}
+
+/*
+ * vm_kernel_addrperm_external:
+ * vm_kernel_unslide_or_perm_external:
+ *
+ * Use these macros when exposing an address to userspace that could come from
+ * either kernel text/data *or* the heap.
+ */
+void
+vm_kernel_addrperm_external(
+ vm_offset_t addr,
+ vm_offset_t *perm_addr)
+{
+ if (VM_KERNEL_IS_SLID(addr)) {
+ *perm_addr = VM_KERNEL_UNSLIDE(addr);
+ } else if (VM_KERNEL_ADDRESS(addr)) {
+ *perm_addr = addr + vm_kernel_addrperm_ext;
+ } else {
+ *perm_addr = addr;
}
+}
- vm_map_unlock(map);
- return kr;
+void
+vm_kernel_unslide_or_perm_external(
+ vm_offset_t addr,
+ vm_offset_t *up_addr)
+{
+ vm_kernel_addrperm_external(addr, up_addr);
}
projects / apple / xnu.git / blobdiff