50a7855ac2
AT_HWCAP is a field in the elf auxiliary vector meant to describe cpu-specific hardware features. For RISC-V we want to use this to indicate the presence of any standard extensions supported by the CPU. This allows userland applications to query the system for supported extensions using elf_aux_info(3). Support for an extension is indicated by the presence of its corresponding bit in AT_HWCAP -- e.g. systems supporting the 'c' extension (compressed instructions) will have the second bit set. Extensions advertised through AT_HWCAP are only those that are supported by all harts in the system. Reviewed by: jhb, markj Approved by: markj (mentor) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D20493
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
/*-
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* Copyright (c) 1995 Bruce D. Evans.
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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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* 3. Neither the name of the author nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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/md_var.h,v 1.40 2001/07/12
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MD_VAR_H_
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#define _MACHINE_MD_VAR_H_
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extern long Maxmem;
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extern char sigcode[];
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extern int szsigcode;
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extern uint64_t *vm_page_dump;
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extern int vm_page_dump_size;
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extern u_long elf_hwcap;
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struct dumperinfo;
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void busdma_swi(void);
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void dump_add_page(vm_paddr_t);
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void dump_drop_page(vm_paddr_t);
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int minidumpsys(struct dumperinfo *);
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#endif /* !_MACHINE_MD_VAR_H_ */
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