d22883d715
e4b8deb222 removed the last in-tree uses of PCPU_INC(). Its
potential benefit is also practically nonexistent. Non-x86
platforms already implement it as PCPU_ADD(..., 1), and according
to [0] there are no recent x86 processors for which the 'inc'
instruction provides a performance benefit over the equivalent
memory-operand form of the 'add' instruction. The only remaining
benefit of 'inc' is smaller instruction size, which in this case
is inconsequential given the limited number of per-CPU data consumers.
[0]: https://www.agner.org/optimize/instruction_tables.pdf
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D29308
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*-
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* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PCPU_H_
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#define _MACHINE_PCPU_H_
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#define ALT_STACK_SIZE 128
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typedef int (*pcpu_bp_harden)(void);
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typedef int (*pcpu_ssbd)(int);
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struct debug_monitor_state;
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#define PCPU_MD_FIELDS \
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u_int pc_acpi_id; /* ACPI CPU id */ \
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u_int pc_midr; /* stored MIDR value */ \
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uint64_t pc_clock; \
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pcpu_bp_harden pc_bp_harden; \
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pcpu_ssbd pc_ssbd; \
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struct pmap *pc_curpmap; \
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struct pmap *pc_curvmpmap; \
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u_int pc_bcast_tlbi_workaround; \
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u_int pc_mpidr; /* stored MPIDR value */ \
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char __pad[201]
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#ifdef _KERNEL
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struct pcb;
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struct pcpu;
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register struct pcpu *pcpup __asm ("x18");
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#define get_pcpu() pcpup
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static inline struct thread *
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get_curthread(void)
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{
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struct thread *td;
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__asm __volatile("ldr %0, [x18]" : "=&r"(td));
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return (td);
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}
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#define curthread get_curthread()
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#define PCPU_GET(member) (pcpup->pc_ ## member)
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#define PCPU_ADD(member, value) (pcpup->pc_ ## member += (value))
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#define PCPU_PTR(member) (&pcpup->pc_ ## member)
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#define PCPU_SET(member,value) (pcpup->pc_ ## member = (value))
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PCPU_H_ */
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