1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/*
* linux/include/asm-arm/proc-armv/pgalloc.h
*
* Copyright (C) 2001 Russell King
*
* Page table allocation/freeing primitives for 32-bit ARM processors.
*/
/* unfortunately, this includes linux/mm.h and the rest of the universe. */
#include <linux/slab.h>
extern kmem_cache_t *pte_cache;
/*
* Allocate one PTE table.
*
* Note that we keep the processor copy of the PTE entries separate
* from the Linux copy. The processor copies are offset by -PTRS_PER_PTE
* words from the Linux copy.
*/
static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
pte_t *pte;
pte = kmem_cache_alloc(pte_cache, GFP_KERNEL);
if (pte)
pte += PTRS_PER_PTE;
return pte;
}
/*
* Free one PTE table.
*/
static inline void pte_free_slow(pte_t *pte)
{
if (pte) {
pte -= PTRS_PER_PTE;
kmem_cache_free(pte_cache, pte);
}
}
/*
* Populate the pmdp entry with a pointer to the pte. This pmd is part
* of the mm address space.
*
* If 'mm' is the init tasks mm, then we are doing a vmalloc, and we
* need to set stuff up correctly for it.
*/
#define pmd_populate(mm,pmdp,pte) \
do { \
unsigned long __prot; \
if (mm == &init_mm) \
__prot = _PAGE_KERNEL_TABLE; \
else \
__prot = _PAGE_USER_TABLE; \
set_pmd(pmdp, __mk_pmd(pte, __prot)); \
} while (0)
|
