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Preset a device object's alignment ("pg_color") based upon the

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physical address of the device's memory.  This enables
pmap_align_superpage() to propose a virtual address for mapping the
device memory that permits the use of superpage mappings.
This commit is contained in:
Alan Cox 2008-05-17 16:26:34 +00:00
parent bdd9aff946
commit e46cd4132c
1 changed files with 5 additions and 1 deletions
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6
sys/vm/device_pager.c
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@ -146,10 +146,14 @@ dev_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t fo
object = vm_pager_object_lookup(&dev_pager_object_list, handle);
if (object == NULL) {
/*
* Allocate object and associate it with the pager.
* Allocate object and associate it with the pager. Initialize
* the object's pg_color based upon the physical address of the
* device's memory.
*/
mtx_unlock(&dev_pager_mtx);
object1 = vm_object_allocate(OBJT_DEVICE, pindex);
object1->flags |= OBJ_COLORED;
object1->pg_color = atop(paddr) - OFF_TO_IDX(off - PAGE_SIZE);
mtx_lock(&dev_pager_mtx);
object = vm_pager_object_lookup(&dev_pager_object_list, handle);
if (object != NULL) {