void
rumptest_busypage()
{
struct lwp *newl;
int rv;
cv_init(&tcv, "napina");
uobj = uao_create(1, 0);
mutex_enter(uobj->vmobjlock);
testpg = uvm_pagealloc(uobj, 0, NULL, 0);
mutex_exit(uobj->vmobjlock);
if (testpg == NULL)
panic("couldn't create vm page");
rv = kthread_create(PRI_NONE, KTHREAD_MUSTJOIN | KTHREAD_MPSAFE, NULL,
thread, NULL, &newl, "jointest");
if (rv)
panic("thread creation failed: %d", rv);
mutex_enter(uobj->vmobjlock);
while (!threadrun)
cv_wait(&tcv, uobj->vmobjlock);
uvm_page_unbusy(&testpg, 1);
mutex_exit(uobj->vmobjlock);
rv = kthread_join(newl);
if (rv)
panic("thread join failed: %d", rv);
}
void
uvm_km_init(vaddr_t start, vaddr_t end)
{
vaddr_t base = VM_MIN_KERNEL_ADDRESS;
/*
* next, init kernel memory objects.
*/
/* kernel_object: for pageable anonymous kernel memory */
uao_init();
uvm.kernel_object = uao_create(VM_MAX_KERNEL_ADDRESS -
VM_MIN_KERNEL_ADDRESS, UAO_FLAG_KERNOBJ);
/*
* init the map and reserve already allocated kernel space
* before installing.
*/
uvm_map_setup(&kernel_map_store, base, end, VM_MAP_PAGEABLE);
kernel_map_store.pmap = pmap_kernel();
if (base != start && uvm_map(&kernel_map_store, &base, start - base,
NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL,
UVM_INH_NONE, UVM_ADV_RANDOM,UVM_FLAG_FIXED)) != 0)
panic("uvm_km_init: could not reserve space for kernel");
/*
* install!
*/
kernel_map = &kernel_map_store;
}
int
exec_sigcode_map(struct proc *p, struct emul *e)
{
vsize_t sz;
sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode;
/*
* If we don't have a sigobject for this emulation, create one.
*
* sigobject is an anonymous memory object (just like SYSV shared
* memory) that we keep a permanent reference to and that we map
* in all processes that need this sigcode. The creation is simple,
* we create an object, add a permanent reference to it, map it in
* kernel space, copy out the sigcode to it and unmap it.
* Then we map it with PROT_READ|PROT_EXEC into the process just
* the way sys_mmap would map it.
*/
if (e->e_sigobject == NULL) {
vaddr_t va;
int r;
e->e_sigobject = uao_create(sz, 0);
uao_reference(e->e_sigobject); /* permanent reference */
va = vm_map_min(kernel_map); /* hint */
if ((r = uvm_map(kernel_map, &va, round_page(sz), e->e_sigobject,
0, 0, UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW,
UVM_INH_SHARE, UVM_ADV_RANDOM, 0)))) {
uao_detach(e->e_sigobject);
return (ENOMEM);
}
memcpy((void *)va, e->e_sigcode, sz);
uvm_unmap(kernel_map, va, va + round_page(sz));
}
/* Just a hint to uvm_mmap where to put it. */
p->p_sigcode = uvm_map_hint(p, VM_PROT_READ|VM_PROT_EXECUTE);
uao_reference(e->e_sigobject);
if (uvm_map(&p->p_vmspace->vm_map, &p->p_sigcode, round_page(sz),
e->e_sigobject, 0, 0, UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX,
UVM_INH_SHARE, UVM_ADV_RANDOM, 0))) {
uao_detach(e->e_sigobject);
return (ENOMEM);
}
return (0);
}
int
exec_sigcode_map(struct process *pr, struct emul *e)
{
vsize_t sz;
sz = (vaddr_t)e->e_esigcode - (vaddr_t)e->e_sigcode;
/*
* If we don't have a sigobject for this emulation, create one.
*
* sigobject is an anonymous memory object (just like SYSV shared
* memory) that we keep a permanent reference to and that we map
* in all processes that need this sigcode. The creation is simple,
* we create an object, add a permanent reference to it, map it in
* kernel space, copy out the sigcode to it and unmap it.
* Then we map it with PROT_READ|PROT_EXEC into the process just
* the way sys_mmap would map it.
*/
if (e->e_sigobject == NULL) {
vaddr_t va;
int r;
e->e_sigobject = uao_create(sz, 0);
uao_reference(e->e_sigobject); /* permanent reference */
if ((r = uvm_map(kernel_map, &va, round_page(sz), e->e_sigobject,
0, 0, UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_READ | PROT_WRITE,
MAP_INHERIT_SHARE, MADV_RANDOM, 0)))) {
uao_detach(e->e_sigobject);
return (ENOMEM);
}
memcpy((void *)va, e->e_sigcode, sz);
uvm_unmap(kernel_map, va, va + round_page(sz));
}
pr->ps_sigcode = 0; /* no hint */
uao_reference(e->e_sigobject);
if (uvm_map(&pr->ps_vmspace->vm_map, &pr->ps_sigcode, round_page(sz),
e->e_sigobject, 0, 0, UVM_MAPFLAG(PROT_READ | PROT_EXEC,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_INHERIT_COPY,
MADV_RANDOM, UVM_FLAG_COPYONW))) {
uao_detach(e->e_sigobject);
return (ENOMEM);
}
return (0);
}
/**
* Initialize an already allocated GEM object of the specified size with
* shmfs backing store.
*/
int drm_gem_object_init(struct drm_device *dev,
struct drm_gem_object *obj, size_t size)
{
BUG_ON((size & (PAGE_SIZE - 1)) != 0);
obj->dev = dev;
#ifdef __NetBSD__
obj->gemo_shm_uao = uao_create(size, 0);
KASSERT(drm_core_check_feature(dev, DRIVER_GEM));
KASSERT(dev->driver->gem_uvm_ops != NULL);
uvm_obj_init(&obj->gemo_uvmobj, dev->driver->gem_uvm_ops, true, 1);
#else
obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
if (IS_ERR(obj->filp))
return PTR_ERR(obj->filp);
#endif
kref_init(&obj->refcount);
atomic_set(&obj->handle_count, 0);
obj->size = size;
return 0;
}
void
uvm_init()
{
vaddr_t kvm_start, kvm_end;
/*
* step 0: ensure that the hardware set the page size
*/
if (uvmexp.pagesize == 0) {
panic("uvm_init: page size not set");
}
/*
* step 1: zero the uvm structure
*/
memset(&uvm, 0, sizeof(uvm));
#ifndef OSKIT
averunnable.fscale = FSCALE;
#endif
/*
* step 2: init the page sub-system. this includes allocating the
* vm_page structures, and setting up all the page queues (and
* locks). available memory will be put in the "free" queue.
* kvm_start and kvm_end will be set to the area of kernel virtual
* memory which is available for general use.
*/
uvm_page_init(&kvm_start, &kvm_end);
/*
* step 3: init the map sub-system. allocates the static pool of
* vm_map_entry structures that are used for "special" kernel maps
* (e.g. kernel_map, kmem_map, etc...).
*/
uvm_map_init();
/*
* step 4: setup the kernel's virtual memory data structures. this
* includes setting up the kernel_map/kernel_object and the kmem_map/
* kmem_object.
*/
uvm_km_init(kvm_start, kvm_end);
/*
* step 5: init the pmap module. the pmap module is free to allocate
* memory for its private use (e.g. pvlists).
*/
pmap_init();
/*
* step 6: init the kernel memory allocator. after this call the
* kernel memory allocator (malloc) can be used.
*/
kmeminit();
/*
* step 7: init all pagers and the pager_map.
*/
uvm_pager_init();
/*
* step 8: init anonymous memory systems (both amap and anons)
*/
amap_init(); /* init amap module */
uvm_anon_init(); /* allocate initial anons */
/*
* the VM system is now up! now that malloc is up we can resize the
* <obj,off> => <page> hash table for general use and enable paging
* of kernel objects.
*/
uvm_page_rehash();
uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
UAO_FLAG_KERNSWAP);
/*
* done!
*/
return;
}
void
uvm_init()
{
vaddr_t kvm_start, kvm_end;
/*
* step 0: ensure that the hardware set the page size
*/
if (uvmexp.pagesize == 0) {
panic("uvm_init: page size not set");
}
/*
* step 1: zero the uvm structure
*/
memset(&uvm, 0, sizeof(uvm));
averunnable.fscale = FSCALE;
/*
* step 2: init the page sub-system. this includes allocating the
* vm_page structures, and setting up all the page queues (and
* locks). available memory will be put in the "free" queue.
* kvm_start and kvm_end will be set to the area of kernel virtual
* memory which is available for general use.
*/
uvm_page_init(&kvm_start, &kvm_end);
/*
* step 3: init the map sub-system. allocates the static pool of
* vm_map_entry structures that are used for "special" kernel maps
* (e.g. kernel_map, kmem_map, etc...).
*/
uvm_map_init();
/*
* step 4: setup the kernel's virtual memory data structures. this
* includes setting up the kernel_map/kernel_object and the kmem_map/
* kmem_object.
*/
uvm_km_init(kvm_start, kvm_end);
/*
* step 5: init the pmap module. the pmap module is free to allocate
* memory for its private use (e.g. pvlists).
*/
pmap_init();
/*
* step 6: init the kernel memory allocator. after this call the
* kernel memory allocator (malloc) can be used.
*/
uvm_km_page_init();
kmeminit();
#if !defined(__HAVE_PMAP_DIRECT)
kthread_create_deferred(uvm_km_createthread, NULL);
#endif
/*
* step 7: init all pagers and the pager_map.
*/
uvm_pager_init();
/*
* step 8: init anonymous memory system
*/
amap_init(); /* init amap module */
/*
* the VM system is now up! now that malloc is up we can resize the
* <obj,off> => <page> hash table for general use and enable paging
* of kernel objects.
*/
uvm_page_rehash();
uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
UAO_FLAG_KERNSWAP);
/*
* reserve some unmapped space for malloc/pool use after free usage
*/
#ifdef DEADBEEF0
kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE;
if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF0);
#endif
#ifdef DEADBEEF1
kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE;
if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF1);
#endif
/*
* init anonymous memory systems
*/
uvm_anon_init();
}
void
uvm_init(void)
{
vaddr_t kvm_start, kvm_end;
/*
* step 0: ensure that the hardware set the page size
*/
if (uvmexp.pagesize == 0) {
panic("uvm_init: page size not set");
}
/*
* step 1: zero the uvm structure
*/
memset(&uvm, 0, sizeof(uvm));
averunnable.fscale = FSCALE;
uvm_amap_init();
/*
* step 2: init the page sub-system. this includes allocating the
* vm_page structures, and setting up all the page queues (and
* locks). available memory will be put in the "free" queue.
* kvm_start and kvm_end will be set to the area of kernel virtual
* memory which is available for general use.
*/
uvm_page_init(&kvm_start, &kvm_end);
/*
* step 3: init the map sub-system. allocates the static pool of
* vm_map_entry structures that are used for "special" kernel maps
* (e.g. kernel_map, kmem_map, etc...).
*/
uvm_map_init();
/*
* step 4: setup the kernel's virtual memory data structures. this
* includes setting up the kernel_map/kernel_object.
*/
uvm_km_init(kvm_start, kvm_end);
/*
* step 5: init the pmap module. the pmap module is free to allocate
* memory for its private use (e.g. pvlists).
*/
pmap_init();
/*
* step 6: init the kernel memory allocator. after this call the
* kernel memory allocator (malloc) can be used. this includes
* setting up the kmem_map.
*/
kmeminit();
#ifdef DEBUG
debug_init();
#endif
/*
* step 7: init all pagers and the pager_map.
*/
uvm_pager_init();
/*
* step 8: init the uvm_loan() facility.
*/
uvm_loan_init();
/*
* Initialize pools. This must be done before anyone manipulates
* any vm_maps because we use a pool for some map entry structures.
*/
pool_subsystem_init();
/*
* init slab memory allocator kmem(9).
*/
kmem_init();
/*
* the VM system is now up! now that kmem is up we can resize the
* <obj,off> => <page> hash table for general use and enable paging
* of kernel objects.
*/
uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
UAO_FLAG_KERNSWAP);
uvmpdpol_reinit();
/*
* init anonymous memory systems
*/
uvm_anon_init();
uvm_uarea_init();
/*
* init readahead module
*/
uvm_ra_init();
}
int
shmget_allocate_segment(struct proc *p,
struct sys_shmget_args /* {
syscallarg(key_t) key;
syscallarg(size_t) size;
syscallarg(int) shmflg;
} */ *uap,
int mode, register_t *retval)
{
size_t size;
key_t key;
int segnum;
struct ucred *cred = p->p_ucred;
struct shmid_ds *shmseg;
struct shm_handle *shm_handle;
int error = 0;
if (SCARG(uap, size) < shminfo.shmmin ||
SCARG(uap, size) > shminfo.shmmax)
return (EINVAL);
if (shm_nused >= shminfo.shmmni) /* any shmids left? */
return (ENOSPC);
size = round_page(SCARG(uap, size));
if (shm_committed + atop(size) > shminfo.shmall)
return (ENOMEM);
shm_nused++;
shm_committed += atop(size);
/*
* If a key has been specified and we had to wait for memory
* to be freed up we need to verify that no one has allocated
* the key we want in the meantime. Yes, this is ugly.
*/
key = SCARG(uap, key);
shmseg = pool_get(&shm_pool, key == IPC_PRIVATE ? PR_WAITOK :
PR_NOWAIT);
if (shmseg == NULL) {
shmseg = pool_get(&shm_pool, PR_WAITOK);
if (shm_find_segment_by_key(key) != -1) {
pool_put(&shm_pool, shmseg);
shm_nused--;
shm_committed -= atop(size);
return (EAGAIN);
}
}
/* XXX - hash shmids instead */
if (shm_last_free < 0) {
for (segnum = 0; segnum < shminfo.shmmni && shmsegs[segnum];
segnum++)
;
if (segnum == shminfo.shmmni)
panic("shmseg free count inconsistent");
} else {
segnum = shm_last_free;
if (++shm_last_free >= shminfo.shmmni || shmsegs[shm_last_free])
shm_last_free = -1;
}
shmsegs[segnum] = shmseg;
shm_handle = (struct shm_handle *)((caddr_t)shmseg + sizeof(*shmseg));
shm_handle->shm_object = uao_create(size, 0);
shmseg->shm_perm.cuid = shmseg->shm_perm.uid = cred->cr_uid;
shmseg->shm_perm.cgid = shmseg->shm_perm.gid = cred->cr_gid;
shmseg->shm_perm.mode = (mode & ACCESSPERMS);
shmseg->shm_perm.seq = shmseqs[segnum] = (shmseqs[segnum] + 1) & 0x7fff;
shmseg->shm_perm.key = key;
shmseg->shm_segsz = SCARG(uap, size);
shmseg->shm_cpid = p->p_p->ps_pid;
shmseg->shm_lpid = shmseg->shm_nattch = 0;
shmseg->shm_atime = shmseg->shm_dtime = 0;
shmseg->shm_ctime = time_second;
shmseg->shm_internal = shm_handle;
*retval = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm);
return (error);
}
void
uvm_init(void)
{
vaddr_t kvm_start, kvm_end;
/*
* step 0: ensure that the hardware set the page size
*/
if (uvmexp.pagesize == 0) {
panic("uvm_init: page size not set");
}
/*
* step 1: set up stats.
*/
averunnable.fscale = FSCALE;
/*
* step 2: init the page sub-system. this includes allocating the
* vm_page structures, and setting up all the page queues (and
* locks). available memory will be put in the "free" queue.
* kvm_start and kvm_end will be set to the area of kernel virtual
* memory which is available for general use.
*/
uvm_page_init(&kvm_start, &kvm_end);
/*
* step 3: init the map sub-system. allocates the static pool of
* vm_map_entry structures that are used for "special" kernel maps
* (e.g. kernel_map, kmem_map, etc...).
*/
uvm_map_init();
/*
* step 4: setup the kernel's virtual memory data structures. this
* includes setting up the kernel_map/kernel_object and the kmem_map/
* kmem_object.
*/
uvm_km_init(kvm_start, kvm_end);
/*
* step 5: init the pmap module. the pmap module is free to allocate
* memory for its private use (e.g. pvlists).
*/
pmap_init();
/*
* step 6: init the kernel memory allocator. after this call the
* kernel memory allocator (malloc) can be used.
*/
kmeminit();
/*
* step 6.5: init the dma allocator, which is backed by pools.
*/
dma_alloc_init();
/*
* step 7: init all pagers and the pager_map.
*/
uvm_pager_init();
/*
* step 8: init anonymous memory system
*/
amap_init(); /* init amap module */
/*
* step 9: init uvm_km_page allocator memory.
*/
uvm_km_page_init();
/*
* the VM system is now up! now that malloc is up we can
* enable paging of kernel objects.
*/
uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
UAO_FLAG_KERNSWAP);
/*
* reserve some unmapped space for malloc/pool use after free usage
*/
#ifdef DEADBEEF0
kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE;
if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF0);
#endif
#ifdef DEADBEEF1
kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE;
if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF1);
#endif
/*
* init anonymous memory systems
*/
uvm_anon_init();
#ifndef SMALL_KERNEL
/*
* Switch kernel and kmem_map over to a best-fit allocator,
* instead of walking the tree.
*/
uvm_map_set_uaddr(kernel_map, &kernel_map->uaddr_any[3],
uaddr_bestfit_create(vm_map_min(kernel_map),
vm_map_max(kernel_map)));
uvm_map_set_uaddr(kmem_map, &kmem_map->uaddr_any[3],
uaddr_bestfit_create(vm_map_min(kmem_map),
vm_map_max(kmem_map)));
#endif /* !SMALL_KERNEL */
}
void
uvm_init(void)
{
vaddr_t kvm_start, kvm_end;
/*
* Ensure that the hardware set the page size, zero the UVM structure.
*/
if (uvmexp.pagesize == 0) {
panic("uvm_init: page size not set");
}
memset(&uvm, 0, sizeof(uvm));
averunnable.fscale = FSCALE;
/*
* Init the page sub-system. This includes allocating the vm_page
* structures, and setting up all the page queues (and locks).
* Available memory will be put in the "free" queue, kvm_start and
* kvm_end will be set to the area of kernel virtual memory which
* is available for general use.
*/
uvm_page_init(&kvm_start, &kvm_end);
/*
* Init the map sub-system.
*/
uvm_map_init();
/*
* Setup the kernel's virtual memory data structures. This includes
* setting up the kernel_map/kernel_object.
* Bootstrap all kernel memory allocators.
*/
uao_init();
uvm_km_bootstrap(kvm_start, kvm_end);
/*
* Setup uvm_map caches and init the amap.
*/
uvm_map_init_caches();
uvm_amap_init();
/*
* Init the pmap module. The pmap module is free to allocate
* memory for its private use (e.g. pvlists).
*/
pmap_init();
/*
* Make kernel memory allocators ready for use.
* After this call the pool/kmem memory allocators can be used.
*/
uvm_km_init();
#ifdef DEBUG
debug_init();
#endif
/*
* Init all pagers and the pager_map.
*/
uvm_pager_init();
/*
* Initialize the uvm_loan() facility.
*/
uvm_loan_init();
/*
* Init emap subsystem.
*/
uvm_emap_sysinit();
/*
* The VM system is now up! Now that kmem is up we can resize the
* <obj,off> => <page> hash table for general use and enable paging
* of kernel objects.
*/
uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
UAO_FLAG_KERNSWAP);
uvmpdpol_reinit();
/*
* Init anonymous memory systems.
*/
uvm_anon_init();
uvm_uarea_init();
/*
* Init readahead mechanism.
*/
uvm_ra_init();
}
