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author | Andreas Sandberg <andreas.sandberg@arm.com> | 2019-10-09 09:45:51 +0100 |
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committer | Andreas Sandberg <andreas.sandberg@arm.com> | 2019-10-18 09:45:01 +0000 |
commit | e0419b2530d2a63af9c55cc3d370719e65baca1f (patch) | |
tree | 4645794362f9cabf4d5f246cd0dc93425b3b6941 /src/base/channel_addr.hh | |
parent | 85e7a59cf0fa0faf4ba6ce61207a863d8840c453 (diff) | |
download | gem5-e0419b2530d2a63af9c55cc3d370719e65baca1f.tar.xz |
base: Add classes that encapsulate a channel address
There are cases where the memory system needs to reason about
channel-local addresses. These are currently represented using the
Addr and AddrRange classes. This is not ideal since it doesn't provide
any type safety when working with global addresses and channel-local
addresses. This is particularly problematic when porting existing
components to work in multi-channel configurations.
This changeset introduces the new ChannelAddr and ChannelAddrRange
classes. These classes encapsulate channel-local addresses in a
contiguous address space. These can, for example, be used in a memory
controller to represent a flat address space when calculating timings
or in a sectored cache.
Change-Id: I45d4061ebc8507a10d0a4577b28796dc5ec7a469
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21600
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Diffstat (limited to 'src/base/channel_addr.hh')
-rw-r--r-- | src/base/channel_addr.hh | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/base/channel_addr.hh b/src/base/channel_addr.hh new file mode 100644 index 000000000..abb01be59 --- /dev/null +++ b/src/base/channel_addr.hh @@ -0,0 +1,193 @@ +/* + * Copyright (c) 2019 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#ifndef __BASE_CHANNEL_ADDR_HH__ +#define __BASE_CHANNEL_ADDR_HH__ + +#include <ostream> + +#include "base/addr_range.hh" + +/** + * Class holding a guest address in a contiguous channel-local address + * space. + */ +class ChannelAddr +{ + public: + using Type = Addr; + + /** Explicit constructor assigning a value. */ + explicit constexpr ChannelAddr(Type _a) : a(_a) { } + + /** Converting back to the value type. */ + explicit constexpr operator Type() const { return a; } + + /** Converting back to the value type. */ + constexpr Type value() const { return a; } + + constexpr ChannelAddr() : a(0) { } + + ChannelAddr(const AddrRange &range, Addr _a) + : a(range.removeIntlvBits(_a)) {} + + ChannelAddr(const ChannelAddr &) = default; + ChannelAddr &operator=(const ChannelAddr &) = default; + + + Addr getPA(const AddrRange &range) const { + return range.addIntlvBits(a); + } + + constexpr ChannelAddr operator|(const Type b) const { + return ChannelAddr(a | b); + } + constexpr ChannelAddr operator&(const Type b) const { + return ChannelAddr(a & b); + } + + constexpr ChannelAddr operator>>(const int b) const { + return ChannelAddr(a >> b); + } + + constexpr ChannelAddr operator<<(const int b) const { + return ChannelAddr(a << b); + } + + constexpr ChannelAddr operator*(const Type &b) const { + return ChannelAddr(a * b); + } + + constexpr ChannelAddr operator/(const Type &b) const { + return ChannelAddr(a / b); + } + + constexpr ChannelAddr operator+(const Type &b) const { + return ChannelAddr(a + b); + } + + constexpr ChannelAddr operator-(const Type &b) const { + return ChannelAddr(a - b); + } + + constexpr ChannelAddr operator|(const ChannelAddr &b) const { + return ChannelAddr(a | b.a); + } + + constexpr ChannelAddr operator&(const ChannelAddr &b) const { + return ChannelAddr(a & b.a); + } + + constexpr ChannelAddr operator^(const ChannelAddr &b) const { + return ChannelAddr(a ^ b.a); + } + + constexpr ChannelAddr operator+(const ChannelAddr &b) const { + return ChannelAddr(a + b.a); + } + + constexpr ChannelAddr operator-(const ChannelAddr &b) const { + return ChannelAddr(a - b.a); + } + + constexpr bool operator>(const ChannelAddr &b) const { return a > b.a; } + constexpr bool operator>=(const ChannelAddr &b) const { return a >= b.a; } + constexpr bool operator<(const ChannelAddr &b) const { return a < b.a; } + constexpr bool operator<=(const ChannelAddr &b) const { return a <= b.a; } + constexpr bool operator==(const ChannelAddr &b) const { return a == b.a; } + constexpr bool operator!=(const ChannelAddr &b) const { return a != b.a; } + + private: + /** Member holding the actual value. */ + Type a; +}; + +/** + * The ChanneelAddrRange class describes a contiguous range of + * addresses in a contiguous channel-local address space. + */ +class ChannelAddrRange +{ + public: + constexpr ChannelAddrRange() + : ChannelAddrRange(ChannelAddr(1), ChannelAddr(0)) {} + + constexpr ChannelAddrRange(ChannelAddr start, ChannelAddr end) + : _start(start), _end(end) {} + + ChannelAddrRange(AddrRange ch_range, Addr start, Addr end); + ChannelAddrRange(AddrRange ch_range, AddrRange range); + + constexpr ChannelAddrRange(const ChannelAddrRange &) = default; + + constexpr ChannelAddr size() const { return _end - _start + 1; } + + constexpr bool valid() const { return _start <= _end; } + + constexpr ChannelAddr start() const { return _start; } + constexpr ChannelAddr end() const { return _end; } + + constexpr bool contains(ChannelAddr a) const { + return a >= _start && a <= _end; + } + + protected: + ChannelAddr _start; + ChannelAddr _end; +}; + +namespace std +{ + template<> + struct hash<ChannelAddr> + { + typedef ChannelAddr argument_type; + typedef std::size_t result_type; + + result_type + operator()(argument_type const &a) const noexcept { + return std::hash<ChannelAddr::Type>{}( + static_cast<argument_type::Type>(a)); + } + }; +} + +std::ostream &operator<<(std::ostream &out, const ChannelAddr &addr); + +#endif // __BASE_CHANNEL_ADDR_HH__ |