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Add vm_map_find_aligned(9).

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Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D24652
This commit is contained in:
Konstantin Belousov 2020-09-09 21:44:59 +00:00
parent 60cd9c95c5
commit 7a9f2da33c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=365516
2 changed files with 15 additions and 0 deletions
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13
sys/vm/vm_map.c
View File

@ -1980,6 +1980,19 @@ vm_map_alignspace(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
}
}
int
vm_map_find_aligned(vm_map_t map, vm_offset_t *addr, vm_size_t length,
vm_offset_t max_addr, vm_offset_t alignment)
{
/* XXXKIB ASLR eh ? */
*addr = vm_map_findspace(map, *addr, length);
if (*addr + length > vm_map_max(map) ||
(max_addr != 0 && *addr + length > max_addr))
return (KERN_NO_SPACE);
return (vm_map_alignspace(map, NULL, 0, addr, length, max_addr,
alignment));
}
/*
* vm_map_find finds an unallocated region in the target address
* map with the given length. The search is defined to be

2
sys/vm/vm_map.h
View File

@ -460,6 +460,8 @@ int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
vm_offset_t, int, vm_prot_t, vm_prot_t, int);
int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
int vm_map_find_aligned(vm_map_t map, vm_offset_t *addr, vm_size_t length,
vm_offset_t max_addr, vm_offset_t alignment);
int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t,
vm_prot_t, vm_prot_t, int);
vm_offset_t vm_map_findspace(vm_map_t, vm_offset_t, vm_size_t);