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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/sparc/lib/U3patch.S
Initial import
Diffstat (limited to 'arch/sparc/lib/U3patch.S')
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1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sparc/lib/U3patch.S b/arch/sparc/lib/U3patch.S
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+/* U3patch.S: Patch Ultra-I routines with Ultra-III variant.
+ *
+ * Copyright (C) 2004 David S. Miller <davem@redhat.com>
+ */
+
+#define BRANCH_ALWAYS 0x10680000
+#define NOP 0x01000000
+#define ULTRA3_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 cheetah_patch_copyops
+ .type cheetah_patch_copyops,#function
+cheetah_patch_copyops:
+ ULTRA3_DO_PATCH(memcpy, U3memcpy)
+ ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user)
+ ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user)
+ retl
+ nop
+ .size cheetah_patch_copyops,.-cheetah_patch_copyops