5573db3f0b
with pmaps. When the context numbers wrap around we flush all user mappings from the tlb. This makes use of the array indexed by cpuid to allow a pmap to have a different context number on a different cpu. If the context numbers are then divided evenly among cpus such that none are shared, we can avoid sending tlb shootdown ipis in an smp system for non-shared pmaps. This also removes a limit of 8192 processes (pmaps) that could be active at any given time due to running out of tlb contexts. Inspired by: the brown book Crucial bugfix from: tmm
69 lines
2.4 KiB
C
69 lines
2.4 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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#ifdef _KERNEL
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#include <machine/asmacros.h>
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#include <machine/frame.h>
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#include <machine/intr_machdep.h>
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#define ALT_STACK_SIZE 128
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/*
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* Inside the kernel, the globally reserved register g7 is used to
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* point at the globaldata structure.
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*/
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#define PCPU_MD_FIELDS \
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struct intr_queue pc_iq; /* interrupt queue */ \
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u_int pc_mid; \
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u_int pc_tlb_ctx; \
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u_int pc_tlb_ctx_max; \
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u_int pc_tlb_ctx_min; \
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u_int pc_wp_insn; /* watch point support */ \
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u_long pc_wp_pstate; \
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u_long pc_wp_va; \
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int pc_wp_mask
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struct pcb;
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struct pcpu;
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register struct pcb *curpcb __asm__(__XSTRING(PCB_REG));
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register struct pcpu *pcpup __asm__(__XSTRING(PCPU_REG));
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#define PCPU_GET(member) (pcpup->pc_ ## member)
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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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