70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/*
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* \brief Common utilities
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-01-02
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _SRC__LIB__HW__UTIL_H_
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#define _SRC__LIB__HW__UTIL_H_
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#include <base/internal/page_size.h>
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namespace Hw
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{
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using Genode::addr_t;
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using Genode::size_t;
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using Genode::get_page_size;
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using Genode::get_page_size_log2;
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/**
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* Get the base mask for the minimal supported page-size
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*/
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constexpr addr_t get_page_mask() { return ~(get_page_size() - 1UL); }
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/**
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* Round down to the minimal page-size alignment
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*/
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constexpr addr_t trunc_page(addr_t addr) {
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return addr & get_page_mask(); }
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/**
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* Round up to the minimal page-size alignment
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*/
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constexpr addr_t round_page(addr_t addr)
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{ return trunc_page(addr + get_page_size() - 1UL); }
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/**
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* Return an address rounded down to a specific alignment
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*
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* \param addr original address
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* \param alignm_log2 log2 of the required alignment
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*/
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constexpr addr_t trunc(addr_t addr, addr_t alignm_log2) {
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return (addr >> alignm_log2) << alignm_log2; }
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/**
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* Return wether a pointer fullfills an alignment
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*
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* \param p pointer
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* \param alignm_log2 log2 of the required alignment
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*/
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inline bool aligned(void * const p, addr_t alignm_log2) {
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return (addr_t)p == trunc((addr_t)p, alignm_log2); }
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/**
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* Round up to a specific alignment
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*/
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constexpr addr_t round(addr_t addr, unsigned alignm_log2) {
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return trunc(addr + (1UL << alignm_log2) - 1UL, alignm_log2); }
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}
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#endif /* _SRC__LIB__HW__UTIL_H_ */
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