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 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
14 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
15 : [addr] "+a" (addr) : [skey] "d" (skey));
19 void storage_key_init_range(unsigned long start, unsigned long end)
21 unsigned long boundary, size;
24 if (MACHINE_HAS_EDAT1) {
25 /* set storage keys for a 1MB frame */
27 boundary = (start + size) & ~(size - 1);
28 if (boundary <= end) {
30 start = sske_frame(start, PAGE_DEFAULT_KEY);
31 } while (start < boundary);
35 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
40 static pte_t *walk_page_table(unsigned long addr)
47 pgdp = pgd_offset_k(addr);
50 pudp = pud_offset(pgdp, addr);
51 if (pud_none(*pudp) || pud_large(*pudp))
53 pmdp = pmd_offset(pudp, addr);
54 if (pmd_none(*pmdp) || pmd_large(*pmdp))
56 ptep = pte_offset_kernel(pmdp, addr);
62 static void change_page_attr(unsigned long addr, int numpages,
68 for (i = 0; i < numpages; i++) {
69 ptep = walk_page_table(addr);
70 if (WARN_ON_ONCE(!ptep))
74 __ptep_ipte(addr, ptep);
80 int set_memory_ro(unsigned long addr, int numpages)
82 change_page_attr(addr, numpages, pte_wrprotect);
86 int set_memory_rw(unsigned long addr, int numpages)
88 change_page_attr(addr, numpages, pte_mkwrite);
93 int set_memory_nx(unsigned long addr, int numpages)
98 int set_memory_x(unsigned long addr, int numpages)
103 #ifdef CONFIG_DEBUG_PAGEALLOC
104 void kernel_map_pages(struct page *page, int numpages, int enable)
106 unsigned long address;
113 for (i = 0; i < numpages; i++) {
114 address = page_to_phys(page + i);
115 pgd = pgd_offset_k(address);
116 pud = pud_offset(pgd, address);
117 pmd = pmd_offset(pud, address);
118 pte = pte_offset_kernel(pmd, address);
120 __ptep_ipte(address, pte);
121 pte_val(*pte) = _PAGE_INVALID;
124 pte_val(*pte) = __pa(address);
128 #ifdef CONFIG_HIBERNATION
129 bool kernel_page_present(struct page *page)
134 addr = page_to_phys(page);
139 : "=d" (cc), "+a" (addr) : : "cc");
142 #endif /* CONFIG_HIBERNATION */
144 #endif /* CONFIG_DEBUG_PAGEALLOC */