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Fixed multiple bugs in previous version of vm_page_alloc_contig.

This commit is contained in:
David Greenman 1994-09-27 19:34:16 +00:00
parent 45fe7a082a
commit 0d040c7eae
1 changed files with 15 additions and 14 deletions
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29
sys/vm/vm_page.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
* $Id: vm_page.c,v 1.5 1994/08/10 03:09:37 davidg Exp $
* $Id: vm_page.c,v 1.6 1994/09/27 18:00:27 davidg Exp $
*/
/*
@ -592,8 +592,8 @@ vm_page_alloc_contig(size, low, high, alignment)
vm_offset_t alignment;
{
int i, s, start = 0;
vm_offset_t addr, phys;
vm_page_t *pga = (vm_page_t *)vm_page_array;
vm_offset_t addr, phys, tmp_addr;
vm_page_t pga = vm_page_array;
extern vm_map_t kernel_map;
if ((alignment & (alignment - 1)) != 0)
@ -605,8 +605,8 @@ again:
* Find first page in array that is free, within range, and aligned.
*/
for (i = start; i < cnt.v_page_count; i++) {
phys = VM_PAGE_TO_PHYS(pga[i]);
if ((pga[i]->flags & PG_FREE == PG_FREE) &&
phys = pga[i].phys_addr;
if (((pga[i].flags & PG_FREE) == PG_FREE) &&
(phys >= low) && (phys < high) &&
((phys & (alignment - 1)) == 0))
break;
@ -615,7 +615,7 @@ again:
/*
* If the above failed or we will exceed the upper bound, fail.
*/
if ((i == cnt.v_page_count) || ((VM_PAGE_TO_PHYS(pga[i]) + size) > high)) {
if ((i == cnt.v_page_count) || ((pga[i].phys_addr + size) > high)) {
splx(s);
return (NULL);
}
@ -626,9 +626,9 @@ again:
* Check successive pages for contiguous and free.
*/
for (i = start + 1; i < (start + size / PAGE_SIZE); i++) {
if ((VM_PAGE_TO_PHYS(pga[i]) !=
(VM_PAGE_TO_PHYS(pga[i - 1]) + PAGE_SIZE)) ||
((pga[i]->flags & PG_FREE) != PG_FREE)) {
if ((pga[i].phys_addr !=
(pga[i - 1].phys_addr + PAGE_SIZE)) ||
((pga[i].flags & PG_FREE) != PG_FREE)) {
start++;
goto again;
}
@ -639,15 +639,16 @@ again:
* Allocate kernel VM, unfree and assign the physical pages to it
* and return kernel VM pointer.
*/
addr = kmem_alloc_pageable(kernel_map, size);
tmp_addr = addr = kmem_alloc_pageable(kernel_map, size);
for (i = start; i < (start + size / PAGE_SIZE); i++) {
TAILQ_REMOVE(&vm_page_queue_free, pga[i], pageq);
TAILQ_REMOVE(&vm_page_queue_free, &pga[i], pageq);
cnt.v_free_count--;
vm_page_wire(pga[i]);
pga[i]->flags = PG_CLEAN; /* shut off PG_FREE and any other flags */
vm_page_wire(&pga[i]);
pga[i].flags = PG_CLEAN; /* shut off PG_FREE and any other flags */
pmap_kenter(tmp_addr, pga[start].phys_addr);
tmp_addr += PAGE_SIZE;
}
pmap_qenter(addr, &pga[start], size / PAGE_SIZE);
splx(s);
return (addr);