1 files changed, 43 insertions, 0 deletions

diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c
index 90d00e47264d..8aa5d1ceaf14 100644
--- a/arch/sh/kernel/sys_sh.c
+++ b/arch/sh/kernel/sys_sh.c
@@ -25,6 +25,8 @@
 #include <asm/syscalls.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
+#include <asm/cacheflush.h>
+#include <asm/cachectl.h>
 
 static inline long
 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
@@ -179,6 +181,47 @@ asmlinkage int sys_ipc(uint call, int first, int second,
         return -EINVAL;
 }
 
+/* sys_cacheflush -- flush (part of) the processor cache.  */
+asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
+{
+        struct vm_area_struct *vma;
+
+        if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
+                return -EINVAL;
+
+        /*
+         * Verify that the specified address region actually belongs
+         * to this process.
+         */
+        if (addr + len < addr)
+                return -EFAULT;
+
+        down_read(&current->mm->mmap_sem);
+        vma = find_vma (current->mm, addr);
+        if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
+                up_read(&current->mm->mmap_sem);
+                return -EFAULT;
+        }
+
+        switch (op & CACHEFLUSH_D_PURGE) {
+                case CACHEFLUSH_D_INVAL:
+                        __flush_invalidate_region((void *)addr, len);
+                        break;
+                case CACHEFLUSH_D_WB:
+                        __flush_wback_region((void *)addr, len);
+                        break;
+                case CACHEFLUSH_D_PURGE:
+                        __flush_purge_region((void *)addr, len);
+                        break;
+        }
+
+        if (op & CACHEFLUSH_I)
+                flush_cache_all();
+
+        up_read(&current->mm->mmap_sem);
+        return 0;
+}
+
 asmlinkage int sys_uname(struct old_utsname __user *name)
 {
         int err;