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>
13 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
15 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
16 : [addr] "+a" (addr) : [skey] "d" (skey));
20 void __storage_key_init_range(unsigned long start, unsigned long end)
22 unsigned long boundary, size;
25 if (MACHINE_HAS_EDAT1) {
26 /* set storage keys for a 1MB frame */
28 boundary = (start + size) & ~(size - 1);
29 if (boundary <= end) {
31 start = sske_frame(start, PAGE_DEFAULT_KEY);
32 } while (start < boundary);
36 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
42 static pte_t *walk_page_table(unsigned long addr)
49 pgdp = pgd_offset_k(addr);
52 pudp = pud_offset(pgdp, addr);
53 if (pud_none(*pudp) || pud_large(*pudp))
55 pmdp = pmd_offset(pudp, addr);
56 if (pmd_none(*pmdp) || pmd_large(*pmdp))
58 ptep = pte_offset_kernel(pmdp, addr);
64 static void change_page_attr(unsigned long addr, int numpages,
70 for (i = 0; i < numpages; i++) {
71 ptep = walk_page_table(addr);
72 if (WARN_ON_ONCE(!ptep))
76 __ptep_ipte(addr, ptep);
82 int set_memory_ro(unsigned long addr, int numpages)
84 change_page_attr(addr, numpages, pte_wrprotect);
88 int set_memory_rw(unsigned long addr, int numpages)
90 change_page_attr(addr, numpages, pte_mkwrite);
95 int set_memory_nx(unsigned long addr, int numpages)
100 int set_memory_x(unsigned long addr, int numpages)
105 #ifdef CONFIG_DEBUG_PAGEALLOC
106 void kernel_map_pages(struct page *page, int numpages, int enable)
108 unsigned long address;
115 for (i = 0; i < numpages; i++) {
116 address = page_to_phys(page + i);
117 pgd = pgd_offset_k(address);
118 pud = pud_offset(pgd, address);
119 pmd = pmd_offset(pud, address);
120 pte = pte_offset_kernel(pmd, address);
122 __ptep_ipte(address, pte);
123 pte_val(*pte) = _PAGE_INVALID;
126 pte_val(*pte) = __pa(address);
130 #ifdef CONFIG_HIBERNATION
131 bool kernel_page_present(struct page *page)
136 addr = page_to_phys(page);
141 : "=d" (cc), "+a" (addr) : : "cc");
144 #endif /* CONFIG_HIBERNATION */
146 #endif /* CONFIG_DEBUG_PAGEALLOC */