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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
commit8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch)
treee9891aa6c295060d065adffd610c4f49ecf884f3 /arch/arm64/lib/bitops.S
parenta71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff)
Linux-libre 4.3.2-gnu
Diffstat (limited to 'arch/arm64/lib/bitops.S')
-rw-r--r--arch/arm64/lib/bitops.S45
1 files changed, 26 insertions, 19 deletions
diff --git a/arch/arm64/lib/bitops.S b/arch/arm64/lib/bitops.S
index 7dac371cc..43ac736ba 100644
--- a/arch/arm64/lib/bitops.S
+++ b/arch/arm64/lib/bitops.S
@@ -18,52 +18,59 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
+#include <asm/lse.h>
/*
* x0: bits 5:0 bit offset
* bits 31:6 word offset
* x1: address
*/
- .macro bitop, name, instr
+ .macro bitop, name, llsc, lse
ENTRY( \name )
and w3, w0, #63 // Get bit offset
eor w0, w0, w3 // Clear low bits
mov x2, #1
add x1, x1, x0, lsr #3 // Get word offset
+alt_lse " prfm pstl1strm, [x1]", "nop"
lsl x3, x2, x3 // Create mask
-1: ldxr x2, [x1]
- \instr x2, x2, x3
- stxr w0, x2, [x1]
- cbnz w0, 1b
+
+alt_lse "1: ldxr x2, [x1]", "\lse x3, [x1]"
+alt_lse " \llsc x2, x2, x3", "nop"
+alt_lse " stxr w0, x2, [x1]", "nop"
+alt_lse " cbnz w0, 1b", "nop"
+
ret
ENDPROC(\name )
.endm
- .macro testop, name, instr
+ .macro testop, name, llsc, lse
ENTRY( \name )
and w3, w0, #63 // Get bit offset
eor w0, w0, w3 // Clear low bits
mov x2, #1
add x1, x1, x0, lsr #3 // Get word offset
+alt_lse " prfm pstl1strm, [x1]", "nop"
lsl x4, x2, x3 // Create mask
-1: ldxr x2, [x1]
- lsr x0, x2, x3 // Save old value of bit
- \instr x2, x2, x4 // toggle bit
- stlxr w5, x2, [x1]
- cbnz w5, 1b
- dmb ish
+
+alt_lse "1: ldxr x2, [x1]", "\lse x4, x2, [x1]"
+ lsr x0, x2, x3
+alt_lse " \llsc x2, x2, x4", "nop"
+alt_lse " stlxr w5, x2, [x1]", "nop"
+alt_lse " cbnz w5, 1b", "nop"
+alt_lse " dmb ish", "nop"
+
and x0, x0, #1
-3: ret
+ ret
ENDPROC(\name )
.endm
/*
* Atomic bit operations.
*/
- bitop change_bit, eor
- bitop clear_bit, bic
- bitop set_bit, orr
+ bitop change_bit, eor, steor
+ bitop clear_bit, bic, stclr
+ bitop set_bit, orr, stset
- testop test_and_change_bit, eor
- testop test_and_clear_bit, bic
- testop test_and_set_bit, orr
+ testop test_and_change_bit, eor, ldeoral
+ testop test_and_clear_bit, bic, ldclral
+ testop test_and_set_bit, orr, ldsetal