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Diffstat (limited to 'sys/vm/vm_mmap.c')
-rw-r--r--sys/vm/vm_mmap.c101
1 files changed, 62 insertions, 39 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index e6759a756844..0a753040bf4e 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -37,7 +37,7 @@
*
* from: Utah $Hdr: vm_mmap.c 1.3 90/01/21$
* from: @(#)vm_mmap.c 7.5 (Berkeley) 6/28/91
- * $Id: vm_mmap.c,v 1.21 1994/01/31 04:20:26 davidg Exp $
+ * $Id: vm_mmap.c,v 1.23 1994/06/22 05:53:10 jkh Exp $
*/
/*
@@ -59,6 +59,7 @@
#include "vm_prot.h"
#include "vm_statistics.h"
#include "vm_user.h"
+#include "vm_page.h"
static boolean_t vm_map_is_allocated(vm_map_t, vm_offset_t, vm_offset_t,
boolean_t);
@@ -181,9 +182,7 @@ smmap(p, uap, retval)
/*
* Check address range for validity
*/
- if (addr + size >= VM_MAXUSER_ADDRESS)
- return(EINVAL);
- if (addr > addr + size)
+ if (addr + size > /* XXX */ VM_MAXUSER_ADDRESS || addr + size < addr)
return(EINVAL);
/*
@@ -255,8 +254,8 @@ smmap(p, uap, retval)
handle = NULL;
}
- error = vm_mmap(&p->p_vmspace->vm_map, &addr, size, prot, maxprot,
- flags, handle, (vm_offset_t)uap->pos);
+ error = vm_mmap(&p->p_vmspace->vm_map, &addr, size, prot,
+ maxprot, flags, handle, (vm_offset_t)uap->pos);
if (error == 0)
*retval = (int) addr;
return(error);
@@ -363,9 +362,7 @@ munmap(p, uap, retval)
size = (vm_size_t) round_page(uap->len);
if (size == 0)
return(0);
- if (addr + size >= VM_MAXUSER_ADDRESS)
- return(EINVAL);
- if (addr >= addr + size)
+ if (addr + size > /* XXX */ VM_MAXUSER_ADDRESS || addr + size < addr)
return(EINVAL);
if (!vm_map_is_allocated(&p->p_vmspace->vm_map, addr, addr+size,
FALSE))
@@ -475,6 +472,7 @@ mincore(p, uap, retval)
return (EOPNOTSUPP);
}
+void pmap_object_init_pt();
/*
* Internal version of mmap.
* Currently used by mmap, exec, and sys5 shared memory.
@@ -493,9 +491,9 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
caddr_t handle; /* XXX should be vp */
vm_offset_t foff;
{
- register vm_pager_t pager;
+ register vm_pager_t pager = 0;
boolean_t fitit;
- vm_object_t object;
+ vm_object_t object = 0;
struct vnode *vp = 0;
int type;
int rv = KERN_SUCCESS;
@@ -508,7 +506,10 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
*addr = round_page(*addr);
} else {
fitit = FALSE;
- (void) vm_deallocate(map, *addr, size);
+ /*
+ * Defer deallocating address space until
+ * after a reference is gained to the object
+ */
}
/*
@@ -516,48 +517,64 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
* gain a reference to ensure continued existance of the object.
* (XXX the exception is to appease the pageout daemon)
*/
- if ((flags & MAP_TYPE) == MAP_ANON)
- type = PG_DFLT;
- else {
- vp = (struct vnode *)handle;
- if (vp->v_type == VCHR) {
- type = PG_DEVICE;
- handle = (caddr_t)(u_long)vp->v_rdev;
- } else
- type = PG_VNODE;
- }
- pager = vm_pager_allocate(type, handle, size, prot, foff);
- if (pager == NULL)
- return (type == PG_DEVICE ? EINVAL : ENOMEM);
+ if ((((flags & MAP_TYPE) != MAP_ANON) || (handle != NULL))) {
+ if ((flags & MAP_TYPE) == MAP_ANON)
+ type = PG_DFLT;
+ else {
+ vp = (struct vnode *)handle;
+ if (vp->v_type == VCHR) {
+ type = PG_DEVICE;
+ handle = (caddr_t)(u_long)vp->v_rdev;
+ } else
+ type = PG_VNODE;
+ }
+ pager = vm_pager_allocate(type, handle, size, prot, foff);
+ if (pager == NULL) {
+ /* on failure, don't leave anything mapped */
+ if (!fitit)
+ (void) vm_deallocate(map, *addr, size);
+ return (type == PG_DEVICE ? EINVAL : ENOMEM);
+ }
/*
* Find object and release extra reference gained by lookup
*/
- object = vm_object_lookup(pager);
- vm_object_deallocate(object);
+ object = vm_object_lookup(pager);
+ vm_object_deallocate(object);
+ }
+
+ /* blow away anything that might be mapped here already */
+ if (!fitit)
+ (void) vm_deallocate(map, *addr, size);
/*
* Anonymous memory.
*/
- if ((flags & MAP_TYPE) == MAP_ANON) {
- rv = vm_allocate_with_pager(map, addr, size, fitit,
+ if (((flags & MAP_TYPE) == MAP_ANON)) {
+ if (handle != NULL) {
+ rv = vm_allocate_with_pager(map, addr, size, fitit,
pager, (vm_offset_t)foff, TRUE);
- if (rv != KERN_SUCCESS) {
- if (handle == NULL)
- vm_pager_deallocate(pager);
- else
+ if (rv != KERN_SUCCESS) {
vm_object_deallocate(object);
- goto out;
- }
+ goto out;
+ }
+#if 1
/*
* Don't cache anonymous objects.
* Loses the reference gained by vm_pager_allocate.
*/
- (void) pager_cache(object, FALSE);
+ (void) pager_cache(object, FALSE);
+#endif
#ifdef DEBUG
- if (mmapdebug & MDB_MAPIT)
- printf("vm_mmap(%d): ANON *addr %x size %x pager %x\n",
- curproc->p_pid, *addr, size, pager);
+ if (mmapdebug & MDB_MAPIT)
+ printf("vm_mmap(%d): ANON *addr %x size %x pager %x\n",
+ curproc->p_pid, *addr, size, pager);
#endif
+ } else {
+ rv = vm_map_find(map, NULL, (vm_offset_t) 0, addr, size, fitit);
+ if(rv != KERN_SUCCESS) {
+ goto out;
+ }
+ }
}
/*
* Must be type MAP_FILE.
@@ -610,6 +627,9 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
pager_cache(object, FALSE);
else
vm_object_deallocate(object);
+
+ if( map->pmap)
+ pmap_object_init_pt(map->pmap, *addr, object, foff, size);
}
/*
* Copy-on-write of file. Two flavors.
@@ -683,6 +703,8 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
*/
vm_object_pmap_copy(object, (vm_offset_t)foff,
(vm_offset_t)foff+size);
+ if( map->pmap)
+ pmap_object_init_pt(map->pmap, *addr, object, foff, size);
vm_object_deallocate(object);
vm_map_deallocate(tmap);
if (rv != KERN_SUCCESS)
@@ -866,6 +888,7 @@ vm_allocate_with_pager(map, addr, size, fitit, pager, poffset, internal)
vm_stat.lookups++;
if (object == NULL) {
object = vm_object_allocate(size);
+ /* don't put internal objects in the hash table */
if (!internal)
vm_object_enter(object, pager);
} else
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-05 10:32:47 +0000