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b4b56f9eca
This patch changes the syscall handler to doom (tabort) active transactions when a syscall is made and return very early without performing the syscall and keeping side effects to a minimum (no CPU accounting or system call tracing is performed). Also included is a new HWCAP2 bit, PPC_FEATURE2_HTM_NOSC, to indicate this behaviour to userspace. Currently, the system call instruction automatically suspends an active transaction which causes side effects to persist when an active transaction fails. This does change the kernel's behaviour, but in a way that was documented as unsupported. It doesn't reduce functionality as syscalls will still be performed after tsuspend; it just requires that the transaction be explicitly suspended. It also provides a consistent interface and makes the behaviour of user code substantially the same across powerpc and platforms that do not support suspended transactions (e.g. x86 and s390). Performance measurements using http://ozlabs.org/~anton/junkcode/null_syscall.c indicate the cost of a normal (non-aborted) system call increases by about 0.25%. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
#ifndef _UAPI__ASM_POWERPC_CPUTABLE_H
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#define _UAPI__ASM_POWERPC_CPUTABLE_H
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/* in AT_HWCAP */
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#define PPC_FEATURE_32 0x80000000
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#define PPC_FEATURE_64 0x40000000
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#define PPC_FEATURE_601_INSTR 0x20000000
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#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
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#define PPC_FEATURE_HAS_FPU 0x08000000
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#define PPC_FEATURE_HAS_MMU 0x04000000
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#define PPC_FEATURE_HAS_4xxMAC 0x02000000
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#define PPC_FEATURE_UNIFIED_CACHE 0x01000000
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#define PPC_FEATURE_HAS_SPE 0x00800000
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#define PPC_FEATURE_HAS_EFP_SINGLE 0x00400000
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#define PPC_FEATURE_HAS_EFP_DOUBLE 0x00200000
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#define PPC_FEATURE_NO_TB 0x00100000
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#define PPC_FEATURE_POWER4 0x00080000
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#define PPC_FEATURE_POWER5 0x00040000
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#define PPC_FEATURE_POWER5_PLUS 0x00020000
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#define PPC_FEATURE_CELL 0x00010000
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#define PPC_FEATURE_BOOKE 0x00008000
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#define PPC_FEATURE_SMT 0x00004000
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#define PPC_FEATURE_ICACHE_SNOOP 0x00002000
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#define PPC_FEATURE_ARCH_2_05 0x00001000
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#define PPC_FEATURE_PA6T 0x00000800
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#define PPC_FEATURE_HAS_DFP 0x00000400
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#define PPC_FEATURE_POWER6_EXT 0x00000200
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#define PPC_FEATURE_ARCH_2_06 0x00000100
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#define PPC_FEATURE_HAS_VSX 0x00000080
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#define PPC_FEATURE_PSERIES_PERFMON_COMPAT \
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0x00000040
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#define PPC_FEATURE_TRUE_LE 0x00000002
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#define PPC_FEATURE_PPC_LE 0x00000001
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/* in AT_HWCAP2 */
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#define PPC_FEATURE2_ARCH_2_07 0x80000000
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#define PPC_FEATURE2_HTM 0x40000000
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#define PPC_FEATURE2_DSCR 0x20000000
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#define PPC_FEATURE2_EBB 0x10000000
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#define PPC_FEATURE2_ISEL 0x08000000
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#define PPC_FEATURE2_TAR 0x04000000
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#define PPC_FEATURE2_VEC_CRYPTO 0x02000000
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#define PPC_FEATURE2_HTM_NOSC 0x01000000
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#endif /* _UAPI__ASM_POWERPC_CPUTABLE_H */
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