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authorVijay Kumar <vijay.ac.kumar@oracle.com>2017-10-11 12:50:03 -0600
committerDavid S. Miller <davem@davemloft.net>2017-11-15 14:26:46 +0900
commitbe52bbe3ea1ae2619ca64d67d56e84a9c7e358f9 (patch)
tree6f08176bf46591a21784199533d7f467613fc61f /arch/sparc/lib
parentsparc64: Define SPARC default fls function (diff)
downloadlinux-dev-be52bbe3ea1ae2619ca64d67d56e84a9c7e358f9.tar.xz
linux-dev-be52bbe3ea1ae2619ca64d67d56e84a9c7e358f9.zip
sparc64: Define SPARC default __fls function
__fls will now require a boot time patching on T4 and above. Redefining it under arch/sparc/lib. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/lib')
-rw-r--r--arch/sparc/lib/Makefile1
-rw-r--r--arch/sparc/lib/fls64.S61
2 files changed, 62 insertions, 0 deletions
diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 3b9f5e0c1bcd..5380c5985420 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -17,6 +17,7 @@ lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o
lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o
lib-$(CONFIG_SPARC64) += multi3.o
lib-$(CONFIG_SPARC64) += fls.o
+lib-$(CONFIG_SPARC64) += fls64.o
lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o
lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o
diff --git a/arch/sparc/lib/fls64.S b/arch/sparc/lib/fls64.S
new file mode 100644
index 000000000000..c83e22ae9586
--- /dev/null
+++ b/arch/sparc/lib/fls64.S
@@ -0,0 +1,61 @@
+/* fls64.S: SPARC default __fls definition.
+ *
+ * SPARC default __fls definition, which follows the same algorithm as
+ * in generic __fls(). This function will be boot time patched on T4
+ * and onward.
+ */
+
+#include <linux/linkage.h>
+#include <asm/export.h>
+
+ .text
+ .register %g2, #scratch
+ .register %g3, #scratch
+ENTRY(__fls)
+ mov -1, %g2
+ sllx %g2, 32, %g2
+ and %o0, %g2, %g2
+ brnz,pt %g2, 1f
+ mov 63, %g1
+ sllx %o0, 32, %o0
+ mov 31, %g1
+1:
+ mov -1, %g2
+ sllx %g2, 48, %g2
+ and %o0, %g2, %g2
+ brnz,pt %g2, 2f
+ mov -1, %g2
+ sllx %o0, 16, %o0
+ add %g1, -16, %g1
+2:
+ mov -1, %g2
+ sllx %g2, 56, %g2
+ and %o0, %g2, %g2
+ brnz,pt %g2, 3f
+ mov -1, %g2
+ sllx %o0, 8, %o0
+ add %g1, -8, %g1
+3:
+ sllx %g2, 60, %g2
+ and %o0, %g2, %g2
+ brnz,pt %g2, 4f
+ mov -1, %g2
+ sllx %o0, 4, %o0
+ add %g1, -4, %g1
+4:
+ sllx %g2, 62, %g2
+ and %o0, %g2, %g2
+ brnz,pt %g2, 5f
+ mov -1, %g3
+ sllx %o0, 2, %o0
+ add %g1, -2, %g1
+5:
+ mov 0, %g2
+ sllx %g3, 63, %g3
+ and %o0, %g3, %o0
+ movre %o0, 1, %g2
+ sub %g1, %g2, %g1
+ jmp %o7+8
+ sra %g1, 0, %o0
+ENDPROC(__fls)
+EXPORT_SYMBOL(__fls)