0ab13648f5
These set of ranges will be looked at if a standard memory range isn't found, and won't be installed in the cache. Use this to implement the memory behaviour of the PCI hole on x86 systems, where writes are ignored and reads always return -1. This allows breakpoints to be set when issuing a 'boot -d', which has the side effect of accessing the PCI hole when changing the PTE protection on kernel code, since the pmap layer hasn't been initialized (a bug, but present in existing FreeBSD releases so has to be handled). Reviewed by: neel Obtained from: NetApp
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*-
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* Copyright (c) 2012 NetApp, Inc.
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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 NETAPP, INC ``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 NETAPP, INC 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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* $FreeBSD$
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*/
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#ifndef _MEM_H_
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#define _MEM_H_
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#include <sys/linker_set.h>
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struct vmctx;
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typedef int (*mem_func_t)(struct vmctx *ctx, int vcpu, int dir, uint64_t addr,
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int size, uint64_t *val, void *arg1, long arg2);
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struct mem_range {
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const char *name;
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int flags;
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mem_func_t handler;
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void *arg1;
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long arg2;
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uint64_t base;
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uint64_t size;
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};
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#define MEM_F_READ 0x1
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#define MEM_F_WRITE 0x2
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#define MEM_F_RW 0x3
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void init_mem(void);
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int emulate_mem(struct vmctx *, int vcpu, uint64_t paddr, struct vie *vie);
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int register_mem(struct mem_range *memp);
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int register_mem_fallback(struct mem_range *memp);
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#endif /* _MEM_H_ */
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