1 files changed, 121 insertions, 0 deletions

diff --git a/arch/mn10300/mm/cache.c b/arch/mn10300/mm/cache.c
new file mode 100644
index 000000000000..1b76719ec1c3
--- /dev/null
+++ b/arch/mn10300/mm/cache.c
@@ -0,0 +1,121 @@
+/* MN10300 Cache flushing routines
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/threads.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+EXPORT_SYMBOL(mn10300_icache_inv);
+EXPORT_SYMBOL(mn10300_dcache_inv);
+EXPORT_SYMBOL(mn10300_dcache_inv_range);
+EXPORT_SYMBOL(mn10300_dcache_inv_range2);
+EXPORT_SYMBOL(mn10300_dcache_inv_page);
+
+#ifdef CONFIG_MN10300_CACHE_WBACK
+EXPORT_SYMBOL(mn10300_dcache_flush);
+EXPORT_SYMBOL(mn10300_dcache_flush_inv);
+EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
+EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
+EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
+EXPORT_SYMBOL(mn10300_dcache_flush_range);
+EXPORT_SYMBOL(mn10300_dcache_flush_range2);
+EXPORT_SYMBOL(mn10300_dcache_flush_page);
+#endif
+
+/*
+ * write a page back from the dcache and invalidate the icache so that we can
+ * run code from it that we've just written into it
+ */
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+        mn10300_dcache_flush_page(page_to_phys(page));
+        mn10300_icache_inv();
+}
+EXPORT_SYMBOL(flush_icache_page);
+
+/*
+ * write some code we've just written back from the dcache and invalidate the
+ * icache so that we can run that code
+ */
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+#ifdef CONFIG_MN10300_CACHE_WBACK
+        unsigned long addr, size, off;
+        struct page *page;
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *ppte, pte;
+
+        for (; start < end; start += size) {
+                /* work out how much of the page to flush */
+                off = start & (PAGE_SIZE - 1);
+
+                size = end - start;
+                if (size > PAGE_SIZE - off)
+                        size = PAGE_SIZE - off;
+
+                /* get the physical address the page is mapped to from the page
+                 * tables */
+                pgd = pgd_offset(current->mm, start);
+                if (!pgd || !pgd_val(*pgd))
+                        continue;
+
+                pud = pud_offset(pgd, start);
+                if (!pud || !pud_val(*pud))
+                        continue;
+
+                pmd = pmd_offset(pud, start);
+                if (!pmd || !pmd_val(*pmd))
+                        continue;
+
+                ppte = pte_offset_map(pmd, start);
+                if (!ppte)
+                        continue;
+                pte = *ppte;
+                pte_unmap(ppte);
+
+                if (pte_none(pte))
+                        continue;
+
+                page = pte_page(pte);
+                if (!page)
+                        continue;
+
+                addr = page_to_phys(page);
+
+                /* flush the dcache and invalidate the icache coverage on that
+                 * region */
+                mn10300_dcache_flush_range2(addr + off, size);
+        }
+#endif
+
+        mn10300_icache_inv();
+}
+EXPORT_SYMBOL(flush_icache_range);
+
+/*
+ * allow userspace to flush the instruction cache
+ */
+asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
+{
+        if (end < start)
+                return -EINVAL;
+
+        flush_icache_range(start, end);
+        return 0;
+}