713841afb2
vm_offset_t pmap_quick_enter_page(vm_page_t m) void pmap_quick_remove_page(vm_offset_t kva) These will create and destroy a temporary, CPU-local KVA mapping of a specified page. Guarantees: --Will not sleep and will not fail. --Safe to call under a non-sleepable lock or from an ithread Restrictions: --Not guaranteed to be safe to call from an interrupt filter or under a spin mutex on all platforms --Current implementation does not guarantee more than one page of mapping space across all platforms. MI code should not make nested calls to pmap_quick_enter_page. --MI code should not perform locking while holding onto a mapping created by pmap_quick_enter_page The idea is to use this in busdma, for bounce buffer copies as well as virtually-indexed cache maintenance on mips and arm. NOTE: the non-i386, non-amd64 implementations of these functions still need review and testing. Reviewed by: kib Approved by: kib (mentor) Differential Revision: http://reviews.freebsd.org/D3013
101 lines
3.1 KiB
C
101 lines
3.1 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/asmacros.h>
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#include <machine/cache.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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struct pmap;
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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 cacheinfo pc_cache; \
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struct intr_request pc_irpool[IR_FREE]; \
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struct intr_request *pc_irhead; \
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struct intr_request **pc_irtail; \
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struct intr_request *pc_irfree; \
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struct pmap *pc_pmap; \
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vm_offset_t pc_addr; \
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vm_offset_t pc_qmap_addr; \
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u_long pc_tickref; \
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u_long pc_tickadj; \
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u_long pc_tickincrement; \
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u_int pc_clock; \
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u_int pc_impl; \
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u_int pc_mid; \
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u_int pc_node; \
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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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char __pad[397]
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#ifdef _KERNEL
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extern void *dpcpu0;
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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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static __inline __pure2 struct thread *
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__curthread(void)
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{
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struct thread *td;
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__asm("ldx [%" __XSTRING(PCPU_REG) "], %0" : "=r" (td));
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return (td);
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}
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#define curthread (__curthread())
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/*
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* XXX The implementation of this operation should be made atomic
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* with respect to preemption.
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*/
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#define PCPU_ADD(member, value) (pcpup->pc_ ## member += (value))
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#define PCPU_INC(member) PCPU_ADD(member, 1)
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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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