2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 #include <linux/hugetlb.h>
6 #include <linux/module.h>
8 #include <asm/cacheflush.h>
9 #include <asm/pgtable.h>
12 void storage_key_init_range(unsigned long start, unsigned long end)
14 unsigned long boundary, function, size;
17 if (MACHINE_HAS_EDAT2) {
18 /* set storage keys for a 2GB frame */
19 function = 0x22000 | PAGE_DEFAULT_KEY;
21 boundary = (start + size) & ~(size - 1);
22 if (boundary <= end) {
24 start = pfmf(function, start);
25 } while (start < boundary);
29 if (MACHINE_HAS_EDAT1) {
30 /* set storage keys for a 1MB frame */
31 function = 0x21000 | PAGE_DEFAULT_KEY;
33 boundary = (start + size) & ~(size - 1);
34 if (boundary <= end) {
36 start = pfmf(function, start);
37 } while (start < boundary);
41 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
46 static pte_t *walk_page_table(unsigned long addr)
53 pgdp = pgd_offset_k(addr);
56 pudp = pud_offset(pgdp, addr);
57 if (pud_none(*pudp) || pud_large(*pudp))
59 pmdp = pmd_offset(pudp, addr);
60 if (pmd_none(*pmdp) || pmd_large(*pmdp))
62 ptep = pte_offset_kernel(pmdp, addr);
68 static void change_page_attr(unsigned long addr, int numpages,
74 for (i = 0; i < numpages; i++) {
75 ptep = walk_page_table(addr);
76 if (WARN_ON_ONCE(!ptep))
80 __ptep_ipte(addr, ptep);
86 int set_memory_ro(unsigned long addr, int numpages)
88 change_page_attr(addr, numpages, pte_wrprotect);
92 int set_memory_rw(unsigned long addr, int numpages)
94 change_page_attr(addr, numpages, pte_mkwrite);
99 int set_memory_nx(unsigned long addr, int numpages)
104 int set_memory_x(unsigned long addr, int numpages)
109 #ifdef CONFIG_DEBUG_PAGEALLOC
110 void kernel_map_pages(struct page *page, int numpages, int enable)
112 unsigned long address;
119 for (i = 0; i < numpages; i++) {
120 address = page_to_phys(page + i);
121 pgd = pgd_offset_k(address);
122 pud = pud_offset(pgd, address);
123 pmd = pmd_offset(pud, address);
124 pte = pte_offset_kernel(pmd, address);
126 __ptep_ipte(address, pte);
127 pte_val(*pte) = _PAGE_TYPE_EMPTY;
130 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
134 #ifdef CONFIG_HIBERNATION
135 bool kernel_page_present(struct page *page)
140 addr = page_to_phys(page);
145 : "=d" (cc), "+a" (addr) : : "cc");
148 #endif /* CONFIG_HIBERNATION */
150 #endif /* CONFIG_DEBUG_PAGEALLOC */