1 files changed, 150 insertions, 0 deletions

diff --git a/arch/avr32/mm/cache.c b/arch/avr32/mm/cache.c
new file mode 100644
index 000000000000..450515b245a0
--- /dev/null
+++ b/arch/avr32/mm/cache.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/highmem.h>
+#include <linux/unistd.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cachectl.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+
+/*
+ * If you attempt to flush anything more than this, you need superuser
+ * privileges.  The value is completely arbitrary.
+ */
+#define CACHEFLUSH_MAX_LEN      1024
+
+void invalidate_dcache_region(void *start, size_t size)
+{
+        unsigned long v, begin, end, linesz;
+
+        linesz = boot_cpu_data.dcache.linesz;
+
+        //printk("invalidate dcache: %p + %u\n", start, size);
+
+        /* You asked for it, you got it */
+        begin = (unsigned long)start & ~(linesz - 1);
+        end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+        for (v = begin; v < end; v += linesz)
+                invalidate_dcache_line((void *)v);
+}
+
+void clean_dcache_region(void *start, size_t size)
+{
+        unsigned long v, begin, end, linesz;
+
+        linesz = boot_cpu_data.dcache.linesz;
+        begin = (unsigned long)start & ~(linesz - 1);
+        end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+        for (v = begin; v < end; v += linesz)
+                clean_dcache_line((void *)v);
+        flush_write_buffer();
+}
+
+void flush_dcache_region(void *start, size_t size)
+{
+        unsigned long v, begin, end, linesz;
+
+        linesz = boot_cpu_data.dcache.linesz;
+        begin = (unsigned long)start & ~(linesz - 1);
+        end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+        for (v = begin; v < end; v += linesz)
+                flush_dcache_line((void *)v);
+        flush_write_buffer();
+}
+
+void invalidate_icache_region(void *start, size_t size)
+{
+        unsigned long v, begin, end, linesz;
+
+        linesz = boot_cpu_data.icache.linesz;
+        begin = (unsigned long)start & ~(linesz - 1);
+        end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+        for (v = begin; v < end; v += linesz)
+                invalidate_icache_line((void *)v);
+}
+
+static inline void __flush_icache_range(unsigned long start, unsigned long end)
+{
+        unsigned long v, linesz;
+
+        linesz = boot_cpu_data.dcache.linesz;
+        for (v = start; v < end; v += linesz) {
+                clean_dcache_line((void *)v);
+                invalidate_icache_line((void *)v);
+        }
+
+        flush_write_buffer();
+}
+
+/*
+ * This one is called after a module has been loaded.
+ */
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+        unsigned long linesz;
+
+        linesz = boot_cpu_data.dcache.linesz;
+        __flush_icache_range(start & ~(linesz - 1),
+                             (end + linesz - 1) & ~(linesz - 1));
+}
+
+/*
+ * This one is called from do_no_page(), do_swap_page() and install_page().
+ */
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+        if (vma->vm_flags & VM_EXEC) {
+                void *v = kmap(page);
+                __flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
+                kunmap(v);
+        }
+}
+
+/*
+ * This one is used by copy_to_user_page()
+ */
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+                             unsigned long addr, int len)
+{
+        if (vma->vm_flags & VM_EXEC)
+                flush_icache_range(addr, addr + len);
+}
+
+asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len)
+{
+        int ret;
+
+        if (len > CACHEFLUSH_MAX_LEN) {
+                ret = -EPERM;
+                if (!capable(CAP_SYS_ADMIN))
+                        goto out;
+        }
+
+        ret = -EFAULT;
+        if (!access_ok(VERIFY_WRITE, addr, len))
+                goto out;
+
+        switch (operation) {
+        case CACHE_IFLUSH:
+                flush_icache_range((unsigned long)addr,
+                                   (unsigned long)addr + len);
+                ret = 0;
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+out:
+        return ret;
+}