Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / avr32 / mm / cache.c

diff --git a/kernel/arch/avr32/mm/cache.c b/kernel/arch/avr32/mm/cache.c
new file mode 100644 (file)
index 0000000..85d635c
--- /dev/null
+++ b/kernel/arch/avr32/mm/cache.c
@@ -0,0 +1,163 @@
+/*
+ * 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>
+#include <asm/syscalls.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, mask;
+
+       linesz = boot_cpu_data.dcache.linesz;
+       mask = linesz - 1;
+
+       /* when first and/or last cachelines are shared, flush them
+        * instead of invalidating ... never discard valid data!
+        */
+       begin = (unsigned long)start;
+       end = begin + size;
+
+       if (begin & mask) {
+               flush_dcache_line(start);
+               begin += linesz;
+       }
+       if (end & mask) {
+               flush_dcache_line((void *)end);
+               end &= ~mask;
+       }
+
+       /* remaining cachelines only need invalidation */
+       for (v = begin; v < end; v += linesz)
+               invalidate_dcache_line((void *)v);
+       flush_write_buffer();
+}
+
+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));
+}
+EXPORT_SYMBOL(flush_icache_range);
+
+/*
+ * This one is called from __do_fault() and do_swap_page().
+ */
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+       if (vma->vm_flags & VM_EXEC) {
+               void *v = page_address(page);
+               __flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
+       }
+}
+
+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;
+}
+
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+               unsigned long vaddr, void *dst, const void *src,
+               unsigned long len)
+{
+       memcpy(dst, src, len);
+       if (vma->vm_flags & VM_EXEC)
+               flush_icache_range((unsigned long)dst,
+                               (unsigned long)dst + len);
+}