1 files changed, 91 insertions, 0 deletions

diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
new file mode 100644
index 000000000000..004e35cdcfff
--- /dev/null
+++ b/arch/arm/mm/pageattr.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/mm.h>
+#include <linux/module.h>
+
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+
+struct page_change_data {
+        pgprot_t set_mask;
+        pgprot_t clear_mask;
+};
+
+static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
+                        void *data)
+{
+        struct page_change_data *cdata = data;
+        pte_t pte = *ptep;
+
+        pte = clear_pte_bit(pte, cdata->clear_mask);
+        pte = set_pte_bit(pte, cdata->set_mask);
+
+        set_pte_ext(ptep, pte, 0);
+        return 0;
+}
+
+static int change_memory_common(unsigned long addr, int numpages,
+                                pgprot_t set_mask, pgprot_t clear_mask)
+{
+        unsigned long start = addr;
+        unsigned long size = PAGE_SIZE*numpages;
+        unsigned long end = start + size;
+        int ret;
+        struct page_change_data data;
+
+        if (!IS_ALIGNED(addr, PAGE_SIZE)) {
+                start &= PAGE_MASK;
+                end = start + size;
+                WARN_ON_ONCE(1);
+        }
+
+        if (!is_module_address(start) || !is_module_address(end - 1))
+                return -EINVAL;
+
+        data.set_mask = set_mask;
+        data.clear_mask = clear_mask;
+
+        ret = apply_to_page_range(&init_mm, start, size, change_page_range,
+                                        &data);
+
+        flush_tlb_kernel_range(start, end);
+        return ret;
+}
+
+int set_memory_ro(unsigned long addr, int numpages)
+{
+        return change_memory_common(addr, numpages,
+                                        __pgprot(L_PTE_RDONLY),
+                                        __pgprot(0));
+}
+
+int set_memory_rw(unsigned long addr, int numpages)
+{
+        return change_memory_common(addr, numpages,
+                                        __pgprot(0),
+                                        __pgprot(L_PTE_RDONLY));
+}
+
+int set_memory_nx(unsigned long addr, int numpages)
+{
+        return change_memory_common(addr, numpages,
+                                        __pgprot(L_PTE_XN),
+                                        __pgprot(0));
+}
+
+int set_memory_x(unsigned long addr, int numpages)
+{
+        return change_memory_common(addr, numpages,
+                                        __pgprot(0),
+                                        __pgprot(L_PTE_XN));
+}