1 files changed, 78 insertions, 0 deletions
diff --git a/arch/sparc/lib/GENpage.S b/arch/sparc/lib/GENpage.S
new file mode 100644
index 000000000..c143c4d1d
--- /dev/null
+++ b/arch/sparc/lib/GENpage.S
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* GENpage.S: Generic clear and copy page.
+ *
+ * Copyright (C) 2007 (davem@davemloft.net)
+ */
+#include <asm/page.h>
+
+	.text
+	.align	32
+
+GENcopy_user_page:
+	set	PAGE_SIZE, %g7
+1:	ldx	[%o1 + 0x00], %o2
+	ldx	[%o1 + 0x08], %o3
+	ldx	[%o1 + 0x10], %o4
+	ldx	[%o1 + 0x18], %o5
+	stx	%o2, [%o0 + 0x00]
+	stx	%o3, [%o0 + 0x08]
+	stx	%o4, [%o0 + 0x10]
+	stx	%o5, [%o0 + 0x18]
+	ldx	[%o1 + 0x20], %o2
+	ldx	[%o1 + 0x28], %o3
+	ldx	[%o1 + 0x30], %o4
+	ldx	[%o1 + 0x38], %o5
+	stx	%o2, [%o0 + 0x20]
+	stx	%o3, [%o0 + 0x28]
+	stx	%o4, [%o0 + 0x30]
+	stx	%o5, [%o0 + 0x38]
+	subcc	%g7, 64, %g7
+	add	%o1, 64, %o1
+	bne,pt	%xcc, 1b
+	 add	%o0, 64, %o0
+	retl
+	 nop
+
+GENclear_page:
+GENclear_user_page:
+	set	PAGE_SIZE, %g7
+1:	stx	%g0, [%o0 + 0x00]
+	stx	%g0, [%o0 + 0x08]
+	stx	%g0, [%o0 + 0x10]
+	stx	%g0, [%o0 + 0x18]
+	stx	%g0, [%o0 + 0x20]
+	stx	%g0, [%o0 + 0x28]
+	stx	%g0, [%o0 + 0x30]
+	stx	%g0, [%o0 + 0x38]
+	subcc	%g7, 64, %g7
+	bne,pt	%xcc, 1b
+	 add	%o0, 64, %o0
+
+#define BRANCH_ALWAYS	0x10680000
+#define NOP		0x01000000
+#define GEN_DO_PATCH(OLD, NEW)	\
+	sethi	%hi(NEW), %g1; \
+	or	%g1, %lo(NEW), %g1; \
+	sethi	%hi(OLD), %g2; \
+	or	%g2, %lo(OLD), %g2; \
+	sub	%g1, %g2, %g1; \
+	sethi	%hi(BRANCH_ALWAYS), %g3; \
+	sll	%g1, 11, %g1; \
+	srl	%g1, 11 + 2, %g1; \
+	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
+	or	%g3, %g1, %g3; \
+	stw	%g3, [%g2]; \
+	sethi	%hi(NOP), %g3; \
+	or	%g3, %lo(NOP), %g3; \
+	stw	%g3, [%g2 + 0x4]; \
+	flush	%g2;
+
+	.globl	generic_patch_pageops
+	.type	generic_patch_pageops,#function
+generic_patch_pageops:
+	GEN_DO_PATCH(copy_user_page, GENcopy_user_page)
+	GEN_DO_PATCH(_clear_page, GENclear_page)
+	GEN_DO_PATCH(clear_user_page, GENclear_user_page)
+	retl
+	 nop
+	.size	generic_patch_pageops,.-generic_patch_pageops