import io-{read,write}s{b,w} functions from linux

This patch imports:
- io-readsb,
- io-readsw,
- io-writesb,
- io-writesw,
from linux

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 96 insertions, 0 deletions

diff --git a/include/linux/linkage.h b/include/linux/linkage.h
new file mode 100644
index 0000000000..9fd1f85902
--- /dev/null
+++ b/include/linux/linkage.h
@@ -0,0 +1,96 @@
+#ifndef _LINUX_LINKAGE_H
+#define _LINUX_LINKAGE_H
+
+#include <linux/compiler.h>
+#include <asm/linkage.h>
+
+#ifdef __cplusplus
+#define CPP_ASMLINKAGE extern "C"
+#else
+#define CPP_ASMLINKAGE
+#endif
+
+#ifndef asmlinkage
+#define asmlinkage CPP_ASMLINKAGE
+#endif
+
+#ifndef asmregparm
+# define asmregparm
+#endif
+
+#define __page_aligned_data	__section(.data.page_aligned) __aligned(PAGE_SIZE)
+#define __page_aligned_bss	__section(.bss.page_aligned) __aligned(PAGE_SIZE)
+
+/*
+ * This is used by architectures to keep arguments on the stack
+ * untouched by the compiler by keeping them live until the end.
+ * The argument stack may be owned by the assembly-language
+ * caller, not the callee, and gcc doesn't always understand
+ * that.
+ *
+ * We have the return value, and a maximum of six arguments.
+ *
+ * This should always be followed by a "return ret" for the
+ * protection to work (ie no more work that the compiler might
+ * end up needing stack temporaries for).
+ */
+/* Assembly files may be compiled with -traditional .. */
+#ifndef __ASSEMBLY__
+#ifndef asmlinkage_protect
+# define asmlinkage_protect(n, ret, args...)	do { } while (0)
+#endif
+#endif
+
+#ifndef __ALIGN
+#define __ALIGN		.align 4,0x90
+#define __ALIGN_STR	".align 4,0x90"
+#endif
+
+#ifdef __ASSEMBLY__
+
+#define ALIGN __ALIGN
+#define ALIGN_STR __ALIGN_STR
+
+#ifndef ENTRY
+#define ENTRY(name) \
+  .globl name; \
+  ALIGN; \
+  name:
+#endif
+
+#ifndef WEAK
+#define WEAK(name)	   \
+	.weak name;	   \
+	name:
+#endif
+
+#define KPROBE_ENTRY(name) \
+  .pushsection .kprobes.text, "ax"; \
+  ENTRY(name)
+
+#define KPROBE_END(name) \
+  END(name);		 \
+  .popsection
+
+#ifndef END
+#define END(name) \
+  .size name, .-name
+#endif
+
+/* If symbol 'name' is treated as a subroutine (gets called, and returns)
+ * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
+ * static analysis tools such as stack depth analyzer.
+ */
+#ifndef ENDPROC
+#define ENDPROC(name) \
+  .type name, @function; \
+  END(name)
+#endif
+
+#endif
+
+#define NORET_TYPE    /**/
+#define ATTRIB_NORET  __attribute__((noreturn))
+#define NORET_AND     noreturn,
+
+#endif