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| 2 |
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| 3 | #ifndef _ASM_SPARC_VDSO_PROCESSOR_H
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| 4 | #define _ASM_SPARC_VDSO_PROCESSOR_H
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| 5 |
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| 6 | #include <linux/compiler.h>
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| 7 |
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| 8 | #if defined(__arch64__)
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| 9 |
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| 10 | |
| 11 | * what these instructions are doing and how they have been chosen.
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| 12 | * To make a long story short, we are trying to yield the current cpu
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| 13 | * strand during busy loops.
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| 14 |
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| 15 | #ifdef BUILD_VDSO
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| 16 | #define cpu_relax() asm volatile("\n99:\n\t" \
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| 17 | "rd %%ccr, %%g0\n\t" \
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| 18 | "rd %%ccr, %%g0\n\t" \
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| 19 | "rd %%ccr, %%g0\n\t" \
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| 20 | ::: "memory")
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| 21 | #else
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| 22 | #define cpu_relax() asm volatile("\n99:\n\t" \
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| 23 | "rd %%ccr, %%g0\n\t" \
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| 24 | "rd %%ccr, %%g0\n\t" \
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| 25 | "rd %%ccr, %%g0\n\t" \
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| 26 | ".section .pause_3insn_patch,\"ax\"\n\t"\
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| 27 | ".word 99b\n\t" \
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| 28 | "wr %%g0, 128, %%asr27\n\t" \
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| 29 | "nop\n\t" \
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| 30 | "nop\n\t" \
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| 31 | ".previous" \
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| 32 | ::: "memory")
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| 33 | #endif
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| 34 |
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| 35 | #else
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| 36 |
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| 37 | #define cpu_relax() barrier()
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| 38 |
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| 39 | #endif
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| 40 |
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| 41 | #endif
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