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-rw-r--r--arch/sparc/lib/bitops.S138
1 files changed, 138 insertions, 0 deletions
diff --git a/arch/sparc/lib/bitops.S b/arch/sparc/lib/bitops.S
new file mode 100644
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+++ b/arch/sparc/lib/bitops.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/* bitops.S: Sparc64 atomic bit operations.
+ *
+ * Copyright (C) 2000, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/export.h>
+#include <linux/linkage.h>
+#include <asm/asi.h>
+#include <asm/backoff.h>
+
+ .text
+
+ENTRY(test_and_set_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ or %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ and %g7, %o2, %g2
+ clr %o0
+ movrne %g2, 1, %o0
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(test_and_set_bit)
+EXPORT_SYMBOL(test_and_set_bit)
+
+ENTRY(test_and_clear_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ andn %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ and %g7, %o2, %g2
+ clr %o0
+ movrne %g2, 1, %o0
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(test_and_clear_bit)
+EXPORT_SYMBOL(test_and_clear_bit)
+
+ENTRY(test_and_change_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ xor %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ and %g7, %o2, %g2
+ clr %o0
+ movrne %g2, 1, %o0
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(test_and_change_bit)
+EXPORT_SYMBOL(test_and_change_bit)
+
+ENTRY(set_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ or %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ nop
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(set_bit)
+EXPORT_SYMBOL(set_bit)
+
+ENTRY(clear_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ andn %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ nop
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(clear_bit)
+EXPORT_SYMBOL(clear_bit)
+
+ENTRY(change_bit) /* %o0=nr, %o1=addr */
+ BACKOFF_SETUP(%o3)
+ srlx %o0, 6, %g1
+ mov 1, %o2
+ sllx %g1, 3, %g3
+ and %o0, 63, %g2
+ sllx %o2, %g2, %o2
+ add %o1, %g3, %o1
+1: ldx [%o1], %g7
+ xor %g7, %o2, %g1
+ casx [%o1], %g7, %g1
+ cmp %g7, %g1
+ bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
+ nop
+ retl
+ nop
+2: BACKOFF_SPIN(%o3, %o4, 1b)
+ENDPROC(change_bit)
+EXPORT_SYMBOL(change_bit)