sh: Add sys_cacheflush() call for SH CPUs.

Adds a system call to allow user code to flush code from the cache.
You can use instructions for the data side, but the iside can
only be done by a flush ROM which really only works with a direct
mapped cache. The later SH4's have 2 way Iside, so this call allows
a portable way to flush the cache.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

4 files changed, 15 insertions, 3 deletions

diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
index 43910cdf78a5..e121c30f797d 100644
--- a/arch/sh/include/asm/Kbuild
+++ b/arch/sh/include/asm/Kbuild
@@ -1,6 +1,6 @@
 include include/asm-generic/Kbuild.asm
 
-header-y += cpu-features.h
+header-y += cachectl.h cpu-features.h
 
 unifdef-y += unistd_32.h
 unifdef-y += unistd_64.h
diff --git a/arch/sh/include/asm/cachectl.h b/arch/sh/include/asm/cachectl.h
new file mode 100644
index 000000000000..305dd7082a66
--- /dev/null
+++ b/arch/sh/include/asm/cachectl.h
@@ -0,0 +1,12 @@
+#ifndef _SH_CACHECTL_H
+#define _SH_CACHECTL_H
+
+/* Definitions for the cacheflush system call.  */
+
+#define CACHEFLUSH_D_INVAL      0x1     /* invalidate (without write back) */
+#define CACHEFLUSH_D_WB         0x2     /* write back (without invalidate) */
+#define CACHEFLUSH_D_PURGE      0x3     /* writeback and invalidate */
+
+#define CACHEFLUSH_I            0x4
+
+#endif /* _SH_CACHECTL_H */
diff --git a/arch/sh/include/asm/unistd_32.h b/arch/sh/include/asm/unistd_32.h
index 61d6ad93d786..925dd40d9d55 100644
--- a/arch/sh/include/asm/unistd_32.h
+++ b/arch/sh/include/asm/unistd_32.h
@@ -132,7 +132,7 @@
 #define __NR_clone              120
 #define __NR_setdomainname      121
 #define __NR_uname              122
-#define __NR_modify_ldt         123
+#define __NR_cacheflush         123
 #define __NR_adjtimex           124
 #define __NR_mprotect           125
 #define __NR_sigprocmask        126
diff --git a/arch/sh/include/asm/unistd_64.h b/arch/sh/include/asm/unistd_64.h
index a751699afda3..2b84bc916bc5 100644
--- a/arch/sh/include/asm/unistd_64.h
+++ b/arch/sh/include/asm/unistd_64.h
@@ -137,7 +137,7 @@
 #define __NR_clone              120
 #define __NR_setdomainname      121
 #define __NR_uname              122
-#define __NR_modify_ldt         123
+#define __NR_cacheflush         123
 #define __NR_adjtimex           124
 #define __NR_mprotect           125
 #define __NR_sigprocmask        126