Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / include / asm / user_gateway.h

diff --git a/kernel/arch/metag/include/asm/user_gateway.h b/kernel/arch/metag/include/asm/user_gateway.h
new file mode 100644 (file)
index 0000000..e404c09
--- /dev/null
+++ b/kernel/arch/metag/include/asm/user_gateway.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2010 Imagination Technologies
+ */
+
+#ifndef __ASM_METAG_USER_GATEWAY_H
+#define __ASM_METAG_USER_GATEWAY_H
+
+#include <asm/page.h>
+
+/* Page of kernel code accessible to userspace. */
+#define USER_GATEWAY_PAGE      0x6ffff000
+/* Offset of TLS pointer array in gateway page. */
+#define USER_GATEWAY_TLS       0x100
+
+#ifndef __ASSEMBLY__
+
+extern char __user_gateway_start;
+extern char __user_gateway_end;
+
+/* Kernel mapping of the gateway page. */
+extern void *gateway_page;
+
+static inline void set_gateway_tls(void __user *tls_ptr)
+{
+       void **gateway_tls = (void **)(gateway_page + USER_GATEWAY_TLS +
+                                      hard_processor_id() * 4);
+
+       *gateway_tls = (__force void *)tls_ptr;
+#ifdef CONFIG_METAG_META12
+       /* Avoid cache aliases on virtually tagged cache. */
+       __builtin_dcache_flush((void *)USER_GATEWAY_PAGE + USER_GATEWAY_TLS +
+                                      hard_processor_id() * sizeof(void *));
+#endif
+}
+
+extern int __kuser_get_tls(void);
+extern char *__kuser_get_tls_end[];
+
+extern int __kuser_cmpxchg(int, int, unsigned long *);
+extern char *__kuser_cmpxchg_end[];
+
+#endif
+
+#endif