[PATCH 01/27 v11] xen/arm: vpl011: Define common ring buffer helper functions in console.h

[Bhupinder Thakur <bhupinder.thakur@linaro.org>]

DEFINE_XEN_FLEX_RING(xencons) defines common helper functions such as
xencons_queued() to tell the current size of the ring buffer,
xencons_mask() to mask off the index, which are useful helper functions.
pl011 emulation code will use these helper functions.

io/console.h includes io/ring.h which defines DEFINE_XEN_FLEX_RING.

In console/daemon/io.c, string.h had to be included before io/console.h
because ring.h uses string functions.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>

Changes since v10:
- Fix for the headers.chk/headers++.chk compilation failures when code is compiled natively.
    1)  Inclusion of DEFINE_XEN_FLEX_RING in console.h had to be put under
        !defined(__STRICT_ANSI__) check as console.h is __STRICT_ANSI__
        currently since it is part of headers.chk.
    2)  Also string header file had to be added as a pre-req for headers++.chk to pass
        the compilation because c++ does not define __STRICT_ANSI__ and thus
        expands DEFINE_XEN_FLEX_RING, which looks for memcpy(), size_t declarations.
        To satify that requirement string header file had to be added a pre-req
        for header++.chk.
 
Changes since v4:
- Split this change in a separate patch.

 tools/console/daemon/io.c       | 2 +-
 xen/include/public/io/console.h | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

 tools/console/daemon/io.c       | 2 +-
 xen/include/Makefile            | 1 +
 xen/include/public/io/console.h | 6 ++++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 7e474bb..e8033d2 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -21,6 +21,7 @@
 
 #include "utils.h"
 #include "io.h"
+#include <string.h>
 #include <xenevtchn.h>
 #include <xengnttab.h>
 #include <xenstore.h>
@@ -29,7 +30,6 @@
 
 #include <stdlib.h>
 #include <errno.h>
-#include <string.h>
 #include <poll.h>
 #include <fcntl.h>
 #include <unistd.h>
diff --git a/xen/include/Makefile b/xen/include/Makefile
index 1299b19..c90fdee 100644
--- a/xen/include/Makefile
+++ b/xen/include/Makefile
@@ -98,6 +98,7 @@ PUBLIC_C99_HEADERS := public/io/9pfs.h public/io/pvcalls.h
 PUBLIC_ANSI_HEADERS := $(filter-out public/%ctl.h public/xsm/% public/%hvm/save.h $(PUBLIC_C99_HEADERS), $(PUBLIC_HEADERS))
 
 public/io/9pfs.h-prereq := string
+public/io/console.h-prereq := string
 public/io/pvcalls.h-prereq := string
 
 headers.chk: $(PUBLIC_ANSI_HEADERS) Makefile
diff --git a/xen/include/public/io/console.h b/xen/include/public/io/console.h
index e2cd97f..0f0711f 100644
--- a/xen/include/public/io/console.h
+++ b/xen/include/public/io/console.h
@@ -27,6 +27,8 @@
 #ifndef __XEN_PUBLIC_IO_CONSOLE_H__
 #define __XEN_PUBLIC_IO_CONSOLE_H__
 
+#include "ring.h"
+
 typedef uint32_t XENCONS_RING_IDX;
 
 #define MASK_XENCONS_IDX(idx, ring) ((idx) & (sizeof(ring)-1))
@@ -38,6 +40,10 @@ struct xencons_interface {
     XENCONS_RING_IDX out_cons, out_prod;
 };
 
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+DEFINE_XEN_FLEX_RING(xencons);
+#endif
+
 #endif /* __XEN_PUBLIC_IO_CONSOLE_H__ */
 
 /*
-- 
2.7.4


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