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-rw-r--r--arch/sparc/lib/GENpage.S78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/sparc/lib/GENpage.S b/arch/sparc/lib/GENpage.S
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+/* 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