blob: 73c3da393e88dfd332fbb8314397ae69d6c623cc [file] [log] [blame]
Jan Glauber305b1522011-03-15 17:08:22 +01001/*
2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
4 */
Heiko Carstens6b70a922012-11-02 12:56:43 +01005#include <linux/hugetlb.h>
Jan Glauber305b1522011-03-15 17:08:22 +01006#include <linux/module.h>
7#include <linux/mm.h>
Martin Schwidefsky638ad342011-10-30 15:17:13 +01008#include <asm/cacheflush.h>
Jan Glauber305b1522011-03-15 17:08:22 +01009#include <asm/pgtable.h>
Heiko Carstens6b70a922012-11-02 12:56:43 +010010#include <asm/page.h>
11
12void storage_key_init_range(unsigned long start, unsigned long end)
13{
14 unsigned long boundary, function, size;
15
16 while (start < end) {
17 if (MACHINE_HAS_EDAT2) {
18 /* set storage keys for a 2GB frame */
19 function = 0x22000 | PAGE_DEFAULT_KEY;
20 size = 1UL << 31;
21 boundary = (start + size) & ~(size - 1);
22 if (boundary <= end) {
23 do {
24 start = pfmf(function, start);
25 } while (start < boundary);
26 continue;
27 }
28 }
29 if (MACHINE_HAS_EDAT1) {
30 /* set storage keys for a 1MB frame */
31 function = 0x21000 | PAGE_DEFAULT_KEY;
32 size = 1UL << 20;
33 boundary = (start + size) & ~(size - 1);
34 if (boundary <= end) {
35 do {
36 start = pfmf(function, start);
37 } while (start < boundary);
38 continue;
39 }
40 }
41 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
42 start += PAGE_SIZE;
43 }
44}
Jan Glauber305b1522011-03-15 17:08:22 +010045
Heiko Carstens5b1ba9e2012-10-01 16:18:46 +020046static pte_t *walk_page_table(unsigned long addr)
47{
48 pgd_t *pgdp;
49 pud_t *pudp;
50 pmd_t *pmdp;
51 pte_t *ptep;
52
53 pgdp = pgd_offset_k(addr);
54 if (pgd_none(*pgdp))
55 return NULL;
56 pudp = pud_offset(pgdp, addr);
Heiko Carstens18da2362012-10-08 09:18:26 +020057 if (pud_none(*pudp) || pud_large(*pudp))
Heiko Carstens5b1ba9e2012-10-01 16:18:46 +020058 return NULL;
59 pmdp = pmd_offset(pudp, addr);
60 if (pmd_none(*pmdp) || pmd_large(*pmdp))
61 return NULL;
62 ptep = pte_offset_kernel(pmdp, addr);
63 if (pte_none(*ptep))
64 return NULL;
65 return ptep;
66}
67
Jan Glauber305b1522011-03-15 17:08:22 +010068static void change_page_attr(unsigned long addr, int numpages,
69 pte_t (*set) (pte_t))
70{
71 pte_t *ptep, pte;
Jan Glauber305b1522011-03-15 17:08:22 +010072 int i;
73
74 for (i = 0; i < numpages; i++) {
Heiko Carstens5b1ba9e2012-10-01 16:18:46 +020075 ptep = walk_page_table(addr);
76 if (WARN_ON_ONCE(!ptep))
77 break;
Jan Glauber305b1522011-03-15 17:08:22 +010078 pte = *ptep;
79 pte = set(pte);
Martin Schwidefskyb2fa47e2011-05-23 10:24:40 +020080 __ptep_ipte(addr, ptep);
Jan Glauber305b1522011-03-15 17:08:22 +010081 *ptep = pte;
Jan Glaubere4c031b2011-04-20 10:15:32 +020082 addr += PAGE_SIZE;
Jan Glauber305b1522011-03-15 17:08:22 +010083 }
84}
85
86int set_memory_ro(unsigned long addr, int numpages)
87{
88 change_page_attr(addr, numpages, pte_wrprotect);
89 return 0;
90}
Jan Glauber305b1522011-03-15 17:08:22 +010091
92int set_memory_rw(unsigned long addr, int numpages)
93{
94 change_page_attr(addr, numpages, pte_mkwrite);
95 return 0;
96}
Jan Glauber305b1522011-03-15 17:08:22 +010097
98/* not possible */
99int set_memory_nx(unsigned long addr, int numpages)
100{
101 return 0;
102}
Jan Glauber448694a2011-05-19 16:55:26 -0600103
104int set_memory_x(unsigned long addr, int numpages)
105{
106 return 0;
107}