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Change the map entry flags from bitfields to bitmasks. Allows

Browse Source 
for some code simplification.
This commit is contained in:
dyson 1997-01-16 04:16:22 +00:00
parent 4f9d9e8336
commit 5136809466
9 changed files with 82 additions and 93 deletions
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4
sys/fs/procfs/procfs_map.c
View File

@ -113,7 +113,7 @@ procfs_domap(curp, p, pfs, uio)
int resident, privateresident;
char *type;
if (entry->is_a_map || entry->is_sub_map)
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP))
continue;
obj = entry->object.vm_object;
@ -163,7 +163,7 @@ case OBJT_DEVICE:
(entry->protection & VM_PROT_READ)?"r":"-",
(entry->protection & VM_PROT_WRITE)?"w":"-",
(entry->protection & VM_PROT_EXECUTE)?"x":"-",
entry->copy_on_write?"COW":" ",
(entry->eflags & MAP_ENTRY_COW)?"COW":" ",
type);
len = strlen(mebuffer);

4
sys/miscfs/procfs/procfs_map.c
View File

@ -113,7 +113,7 @@ procfs_domap(curp, p, pfs, uio)
int resident, privateresident;
char *type;
if (entry->is_a_map || entry->is_sub_map)
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP))
continue;
obj = entry->object.vm_object;
@ -163,7 +163,7 @@ case OBJT_DEVICE:
(entry->protection & VM_PROT_READ)?"r":"-",
(entry->protection & VM_PROT_WRITE)?"w":"-",
(entry->protection & VM_PROT_EXECUTE)?"x":"-",
entry->copy_on_write?"COW":" ",
(entry->eflags & MAP_ENTRY_COW)?"COW":" ",
type);
len = strlen(mebuffer);

4
sys/vm/vm_fault.c
View File

@ -197,7 +197,7 @@ RetryFault:;
return (result);
}
if (entry->nofault) {
if (entry->eflags & MAP_ENTRY_NOFAULT) {
panic("vm_fault: fault on nofault entry, addr: %lx",
vaddr);
}
@ -209,7 +209,7 @@ RetryFault:;
* to COW .text. We simply keep .text from ever being COW'ed
* and take the heat that one cannot debug wired .text sections.
*/
if ((change_wiring == VM_FAULT_USER_WIRE) && entry->needs_copy) {
if ((change_wiring == VM_FAULT_USER_WIRE) && (entry->eflags & MAP_ENTRY_NEEDS_COPY)) {
if(entry->protection & VM_PROT_WRITE) {
int tresult;
vm_map_lookup_done(map, entry);

143
sys/vm/vm_map.c
View File

@ -606,6 +606,7 @@ vm_map_insert(map, object, offset, start, end, prot, max, cow)
register vm_map_entry_t prev_entry;
vm_map_entry_t temp_entry;
vm_object_t prev_object;
u_char protoeflags;
if ((object != NULL) && (cow & MAP_NOFAULT)) {
panic("vm_map_insert: paradoxical MAP_NOFAULT request");
@ -637,6 +638,16 @@ vm_map_insert(map, object, offset, start, end, prot, max, cow)
(prev_entry->next->start < end))
return (KERN_NO_SPACE);
protoeflags = 0;
if (cow & MAP_COPY_NEEDED)
protoeflags |= MAP_ENTRY_NEEDS_COPY;
if (cow & MAP_COPY_ON_WRITE)
protoeflags |= MAP_ENTRY_COW;
if (cow & MAP_NOFAULT)
protoeflags |= MAP_ENTRY_NOFAULT;
/*
* See if we can avoid creating a new entry by extending one of our
* neighbors. Or at least extend the object.
@ -644,19 +655,13 @@ vm_map_insert(map, object, offset, start, end, prot, max, cow)
if ((object == NULL) &&
(prev_entry != &map->header) &&
( ! prev_entry->is_a_map) &&
( ! prev_entry->is_sub_map) &&
(( prev_entry->eflags & (MAP_ENTRY_IS_A_MAP | MAP_ENTRY_IS_SUB_MAP)) == 0) &&
(prev_entry->end == start) &&
(prev_entry->wired_count == 0)) {
u_char needs_copy = (cow & MAP_COPY_NEEDED) != 0;
u_char copy_on_write = (cow & MAP_COPY_ON_WRITE) != 0;
u_char nofault = (cow & MAP_NOFAULT) != 0;
if ((needs_copy == prev_entry->needs_copy) &&
(copy_on_write == prev_entry->copy_on_write) &&
(nofault == prev_entry->nofault) &&
(nofault ||
if ((protoeflags == prev_entry->eflags) &&
((cow & MAP_NOFAULT) ||
vm_object_coalesce(prev_entry->object.vm_object,
OFF_TO_IDX(prev_entry->offset),
(vm_size_t) (prev_entry->end - prev_entry->start),
@ -672,7 +677,7 @@ vm_map_insert(map, object, offset, start, end, prot, max, cow)
map->size += (end - prev_entry->end);
prev_entry->end = end;
if (!nofault) {
if ((cow & MAP_NOFAULT) == 0) {
prev_object = prev_entry->object.vm_object;
default_pager_convert_to_swapq(prev_object);
}
@ -696,26 +701,10 @@ vm_map_insert(map, object, offset, start, end, prot, max, cow)
new_entry->start = start;
new_entry->end = end;
new_entry->is_a_map = FALSE;
new_entry->is_sub_map = FALSE;
new_entry->eflags = protoeflags;
new_entry->object.vm_object = object;
new_entry->offset = offset;
if (cow & MAP_COPY_NEEDED)
new_entry->needs_copy = TRUE;
else
new_entry->needs_copy = FALSE;
if (cow & MAP_COPY_ON_WRITE)
new_entry->copy_on_write = TRUE;
else
new_entry->copy_on_write = FALSE;
if (cow & MAP_NOFAULT)
new_entry->nofault = TRUE;
else
new_entry->nofault = FALSE;
if (map->is_main_map) {
new_entry->inheritance = VM_INHERIT_DEFAULT;
new_entry->protection = prot;
@ -859,7 +848,7 @@ vm_map_simplify_entry(map, entry)
vm_map_entry_t next, prev;
vm_size_t prevsize, esize;
if (entry->is_sub_map || entry->is_a_map)
if (entry->eflags & (MAP_ENTRY_IS_SUB_MAP|MAP_ENTRY_IS_A_MAP))
return;
prev = entry->prev;
@ -870,13 +859,10 @@ vm_map_simplify_entry(map, entry)
(!prev->object.vm_object || (prev->object.vm_object->behavior == entry->object.vm_object->behavior)) &&
(!prev->object.vm_object ||
(prev->offset + prevsize == entry->offset)) &&
(prev->needs_copy == entry->needs_copy) &&
(prev->copy_on_write == entry->copy_on_write) &&
(prev->eflags == entry->eflags) &&
(prev->protection == entry->protection) &&
(prev->max_protection == entry->max_protection) &&
(prev->inheritance == entry->inheritance) &&
(prev->is_a_map == FALSE) &&
(prev->is_sub_map == FALSE) &&
(prev->wired_count == entry->wired_count)) {
if (map->first_free == prev)
map->first_free = entry;
@ -899,13 +885,10 @@ vm_map_simplify_entry(map, entry)
(!next->object.vm_object || (next->object.vm_object->behavior == entry->object.vm_object->behavior)) &&
(!entry->object.vm_object ||
(entry->offset + esize == next->offset)) &&
(next->needs_copy == entry->needs_copy) &&
(next->copy_on_write == entry->copy_on_write) &&
(next->eflags == entry->eflags) &&
(next->protection == entry->protection) &&
(next->max_protection == entry->max_protection) &&
(next->inheritance == entry->inheritance) &&
(next->is_a_map == FALSE) &&
(next->is_sub_map == FALSE) &&
(next->wired_count == entry->wired_count)) {
if (map->first_free == next)
map->first_free = entry;
@ -961,7 +944,7 @@ _vm_map_clip_start(map, entry, start)
vm_map_entry_link(map, entry->prev, new_entry);
if (entry->is_a_map || entry->is_sub_map)
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP))
vm_map_reference(new_entry->object.share_map);
else
vm_object_reference(new_entry->object.vm_object);
@ -1005,7 +988,7 @@ _vm_map_clip_end(map, entry, end)
vm_map_entry_link(map, entry, new_entry);
if (entry->is_a_map || entry->is_sub_map)
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP))
vm_map_reference(new_entry->object.share_map);
else
vm_object_reference(new_entry->object.vm_object);
@ -1067,11 +1050,9 @@ vm_map_submap(map, start, end, submap)
vm_map_clip_end(map, entry, end);
if ((entry->start == start) && (entry->end == end) &&
(!entry->is_a_map) &&
(entry->object.vm_object == NULL) &&
(!entry->copy_on_write)) {
entry->is_a_map = FALSE;
entry->is_sub_map = TRUE;
((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_COW)) == 0) &&
(entry->object.vm_object == NULL)) {
entry->eflags |= MAP_ENTRY_IS_SUB_MAP;
vm_map_reference(entry->object.sub_map = submap);
result = KERN_SUCCESS;
}
@ -1115,7 +1096,7 @@ vm_map_protect(map, start, end, new_prot, set_max)
current = entry;
while ((current != &map->header) && (current->start < end)) {
if (current->is_sub_map) {
if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
vm_map_unlock(map);
return (KERN_INVALID_ARGUMENT);
}
@ -1152,11 +1133,11 @@ vm_map_protect(map, start, end, new_prot, set_max)
*/
if (current->protection != old_prot) {
#define MASK(entry) ((entry)->copy_on_write ? ~VM_PROT_WRITE : \
#define MASK(entry) (((entry)->eflags & MAP_ENTRY_COW) ? ~VM_PROT_WRITE : \
VM_PROT_ALL)
#define max(a,b) ((a) > (b) ? (a) : (b))
if (current->is_a_map) {
if (current->eflags & MAP_ENTRY_IS_A_MAP) {
vm_map_entry_t share_entry;
vm_offset_t share_end;
@ -1229,7 +1210,7 @@ vm_map_madvise(map, pmap, start, end, advise)
for(current = entry;
(current != &map->header) && (current->start < end);
current = current->next) {
if (current->is_a_map || current->is_sub_map) {
if (current->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
continue;
}
vm_map_clip_end(map, current, end);
@ -1377,9 +1358,9 @@ vm_map_user_pageable(map, start, end, new_pageable)
entry = start_entry;
while ((entry != &map->header) && (entry->start < end)) {
if (entry->user_wired) {
if (entry->eflags & MAP_ENTRY_USER_WIRED) {
vm_map_clip_end(map, entry, end);
entry->user_wired = 0;
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
entry->wired_count--;
if (entry->wired_count == 0)
vm_fault_unwire(map, entry->start, entry->end);
@ -1402,29 +1383,29 @@ vm_map_user_pageable(map, start, end, new_pageable)
while ((entry != &map->header) && (entry->start < end)) {
if (entry->user_wired != 0) {
if (entry->eflags & MAP_ENTRY_USER_WIRED) {
entry = entry->next;
continue;
}
if (entry->wired_count != 0) {
entry->wired_count++;
entry->user_wired = 1;
entry->eflags |= MAP_ENTRY_USER_WIRED;
entry = entry->next;
continue;
}
/* Here on entry being newly wired */
if (!entry->is_a_map && !entry->is_sub_map) {
int copyflag = entry->needs_copy;
if ((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) == 0) {
int copyflag = entry->eflags & MAP_ENTRY_NEEDS_COPY;
if (copyflag && ((entry->protection & VM_PROT_WRITE) != 0)) {
vm_object_shadow(&entry->object.vm_object,
&entry->offset,
OFF_TO_IDX(entry->end
- entry->start));
entry->needs_copy = FALSE;
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
} else if (entry->object.vm_object == NULL) {
@ -1441,7 +1422,7 @@ vm_map_user_pageable(map, start, end, new_pageable)
vm_map_clip_end(map, entry, end);
entry->wired_count++;
entry->user_wired = 1;
entry->eflags |= MAP_ENTRY_USER_WIRED;
/* First we need to allow map modifications */
lock_set_recursive(&map->lock);
@ -1451,7 +1432,7 @@ vm_map_user_pageable(map, start, end, new_pageable)
if (rv) {
entry->wired_count--;
entry->user_wired = 0;
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
lock_clear_recursive(&map->lock);
vm_map_unlock(map);
@ -1598,8 +1579,8 @@ vm_map_pageable(map, start, end, new_pageable)
* point to sharing maps, because we won't
* hold the lock on the sharing map.
*/
if (!entry->is_a_map && !entry->is_sub_map) {
int copyflag = entry->needs_copy;
if ((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) == 0) {
int copyflag = entry->eflags & MAP_ENTRY_NEEDS_COPY;
if (copyflag &&
((entry->protection & VM_PROT_WRITE) != 0)) {
@ -1607,7 +1588,7 @@ vm_map_pageable(map, start, end, new_pageable)
&entry->offset,
OFF_TO_IDX(entry->end
- entry->start));
entry->needs_copy = FALSE;
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
} else if (entry->object.vm_object == NULL) {
entry->object.vm_object =
vm_object_allocate(OBJT_DEFAULT,
@ -1740,7 +1721,7 @@ vm_map_clean(map, start, end, syncio, invalidate)
* Make a first pass to check for holes.
*/
for (current = entry; current->start < end; current = current->next) {
if (current->is_sub_map) {
if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
vm_map_unlock_read(map);
return (KERN_INVALID_ARGUMENT);
}
@ -1759,7 +1740,7 @@ vm_map_clean(map, start, end, syncio, invalidate)
for (current = entry; current->start < end; current = current->next) {
offset = current->offset + (start - current->start);
size = (end <= current->end ? end : current->end) - start;
if (current->is_a_map || current->is_sub_map) {
if (current->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
register vm_map_t smap;
vm_map_entry_t tentry;
vm_size_t tsize;
@ -1850,7 +1831,7 @@ vm_map_entry_delete(map, entry)
vm_map_entry_unlink(map, entry);
map->size -= entry->end - entry->start;
if (entry->is_a_map || entry->is_sub_map) {
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
vm_map_deallocate(entry->object.share_map);
} else {
vm_object_deallocate(entry->object.vm_object);
@ -2047,7 +2028,8 @@ vm_map_copy_entry(src_map, dst_map, src_entry, dst_entry)
vm_map_t src_map, dst_map;
register vm_map_entry_t src_entry, dst_entry;
{
if (src_entry->is_sub_map || dst_entry->is_sub_map)
if ((dst_entry->eflags|src_entry->eflags) &
(MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP))
return;
if (src_entry->wired_count == 0) {
@ -2056,7 +2038,7 @@ vm_map_copy_entry(src_map, dst_map, src_entry, dst_entry)
* If the source entry is marked needs_copy, it is already
* write-protected.
*/
if (!src_entry->needs_copy) {
if ((src_entry->eflags & MAP_ENTRY_NEEDS_COPY) == 0) {
boolean_t su;
@ -2089,11 +2071,8 @@ vm_map_copy_entry(src_map, dst_map, src_entry, dst_entry)
src_entry->object.vm_object->type == OBJT_SWAP))
vm_object_collapse(src_entry->object.vm_object);
++src_entry->object.vm_object->ref_count;
src_entry->copy_on_write = TRUE;
src_entry->needs_copy = TRUE;
dst_entry->needs_copy = TRUE;
dst_entry->copy_on_write = TRUE;
src_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
dst_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
dst_entry->object.vm_object =
src_entry->object.vm_object;
dst_entry->offset = src_entry->offset;
@ -2147,7 +2126,7 @@ vmspace_fork(vm1)
old_entry = old_map->header.next;
while (old_entry != &old_map->header) {
if (old_entry->is_sub_map)
if (old_entry->eflags & MAP_ENTRY_IS_SUB_MAP)
panic("vm_map_fork: encountered a submap");
switch (old_entry->inheritance) {
@ -2190,7 +2169,7 @@ vmspace_fork(vm1)
*new_entry = *old_entry;
new_entry->wired_count = 0;
new_entry->object.vm_object = NULL;
new_entry->is_a_map = FALSE;
new_entry->eflags &= ~MAP_ENTRY_IS_A_MAP;
vm_map_entry_link(new_map, new_map->header.prev,
new_entry);
vm_map_copy_entry(old_map, new_map, old_entry,
@ -2291,7 +2270,7 @@ RetryLookup:;
* Handle submaps.
*/
if (entry->is_sub_map) {
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
vm_map_t old_map = map;
*var_map = map = entry->object.sub_map;
@ -2319,7 +2298,7 @@ RetryLookup:;
* If we don't already have a VM object, track it down.
*/
su = !entry->is_a_map;
su = (entry->eflags & MAP_ENTRY_IS_A_MAP) == 0;
if (su) {
share_map = map;
share_offset = vaddr;
@ -2351,7 +2330,7 @@ RetryLookup:;
* If the entry was copy-on-write, we either ...
*/
if (entry->needs_copy) {
if (entry->eflags & MAP_ENTRY_NEEDS_COPY) {
/*
* If we want to write the page, we may as well handle that
* now since we've got the sharing map locked.
@ -2378,7 +2357,7 @@ RetryLookup:;
&entry->offset,
OFF_TO_IDX(entry->end - entry->start));
entry->needs_copy = FALSE;
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
lock_write_to_read(&share_map->lock);
} else {
@ -2447,7 +2426,7 @@ vm_map_lookup_done(map, entry)
* If this entry references a map, unlock it first.
*/
if (entry->is_a_map)
if (entry->eflags & MAP_ENTRY_IS_A_MAP)
vm_map_unlock_read(entry->object.share_map);
/*
@ -2498,12 +2477,12 @@ DB_SHOW_COMMAND(map, vm_map_print)
if (entry->wired_count != 0)
db_printf("wired, ");
}
if (entry->is_a_map || entry->is_sub_map) {
if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
db_printf("share=0x%x, offset=0x%x\n",
(int) entry->object.share_map,
(int) entry->offset);
if ((entry->prev == &map->header) ||
(!entry->prev->is_a_map) ||
((entry->prev->eflags & MAP_ENTRY_IS_A_MAP) == 0) ||
(entry->prev->object.share_map !=
entry->object.share_map)) {
db_indent += 2;
@ -2515,13 +2494,13 @@ DB_SHOW_COMMAND(map, vm_map_print)
db_printf("object=0x%x, offset=0x%x",
(int) entry->object.vm_object,
(int) entry->offset);
if (entry->copy_on_write)
if (entry->eflags & MAP_ENTRY_COW)
db_printf(", copy (%s)",
entry->needs_copy ? "needed" : "done");
(entry->eflags & MAP_ENTRY_NEEDS_COPY) ? "needed" : "done");
db_printf("\n");
if ((entry->prev == &map->header) ||
(entry->prev->is_a_map) ||
(entry->prev->eflags & MAP_ENTRY_IS_A_MAP) ||
(entry->prev->object.vm_object !=
entry->object.vm_object)) {
db_indent += 2;

10
sys/vm/vm_map.h
View File

@ -104,12 +104,15 @@ struct vm_map_entry {
vm_offset_t end; /* end address */
union vm_map_object object; /* object I point to */
vm_ooffset_t offset; /* offset into object */
u_char eflags; /* map entry flags */
#if 0
u_char is_a_map:1, /* Is "object" a map? */
is_sub_map:1, /* Is "object" a submap? */
copy_on_write:1, /* is data copy-on-write */
needs_copy:1, /* does object need to be copied */
nofault:1, /* should never fault */
user_wired:1; /* wired by user */
#endif
/* Only in task maps: */
vm_prot_t protection; /* protection code */
vm_prot_t max_protection; /* maximum protection */
@ -117,6 +120,13 @@ struct vm_map_entry {
int wired_count; /* can be paged if = 0 */
};
#define MAP_ENTRY_IS_A_MAP 0x1
#define MAP_ENTRY_IS_SUB_MAP 0x2
#define MAP_ENTRY_COW 0x4
#define MAP_ENTRY_NEEDS_COPY 0x8
#define MAP_ENTRY_NOFAULT 0x10
#define MAP_ENTRY_USER_WIRED 0x20
/*
* Maps are doubly-linked lists of map entries, kept sorted
* by address. A single hint is provided to start

2
sys/vm/vm_meter.c
View File

@ -179,7 +179,7 @@ vmtotal SYSCTL_HANDLER_ARGS
paging = 0;
for (map = &p->p_vmspace->vm_map, entry = map->header.next;
entry != &map->header; entry = entry->next) {
if (entry->is_a_map || entry->is_sub_map ||
if ((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) ||
entry->object.vm_object == NULL)
continue;
entry->object.vm_object->flags |= OBJ_ACTIVE;

2
sys/vm/vm_mmap.c
View File

@ -652,7 +652,7 @@ mincore(p, uap, retval)
/*
* ignore submaps (for now) or null objects
*/
if (current->is_a_map || current->is_sub_map ||
if ((current->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) ||
current->object.vm_object == NULL)
continue;

2
sys/vm/vm_object.c
View File

@ -1365,7 +1365,7 @@ _vm_object_in_map(map, object, entry)
}
tmpe = tmpe->next;
}
} else if (entry->is_sub_map || entry->is_a_map) {
} else if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
tmpm = entry->object.share_map;
tmpe = tmpm->header.next;
entcount = tmpm->nentries;

4
sys/vm/vm_pageout.c
View File

@ -518,7 +518,7 @@ vm_pageout_map_deactivate_pages(map, desired)
*/
tmpe = map->header.next;
while (tmpe != &map->header) {
if ((tmpe->is_sub_map == 0) && (tmpe->is_a_map == 0)) {
if ((tmpe->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) == 0) {
obj = tmpe->object.vm_object;
if ((obj != NULL) && (obj->shadow_count <= 1) &&
((bigobj == NULL) ||
@ -540,7 +540,7 @@ vm_pageout_map_deactivate_pages(map, desired)
while (tmpe != &map->header) {
if (vm_map_pmap(map)->pm_stats.resident_count <= desired)
break;
if ((tmpe->is_sub_map == 0) && (tmpe->is_a_map == 0)) {
if ((tmpe->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) == 0) {
obj = tmpe->object.vm_object;
if (obj)
vm_pageout_object_deactivate_pages(map, obj, desired, 0);