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// Copyright 2014, ARM Limited
// All rights reserved.
//
// 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 ARM Limited 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 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.
#ifndef VIXL_CPU_A64_H
#define VIXL_CPU_A64_H
#include "vixl/globals.h"
#include "vixl/a64/instructions-a64.h"
namespace vixl {
class CPU {
public:
// Initialise CPU support.
static void SetUp();
// Ensures the data at a given address and with a given size is the same for
// the I and D caches. I and D caches are not automatically coherent on ARM
// so this operation is required before any dynamically generated code can
// safely run.
static void EnsureIAndDCacheCoherency(void *address, size_t length);
// Handle tagged pointers.
template <typename T>
static T SetPointerTag(T pointer, uint64_t tag) {
VIXL_ASSERT(is_uintn(kAddressTagWidth, tag));
// Use C-style casts to get static_cast behaviour for integral types (T),
// and reinterpret_cast behaviour for other types.
uint64_t raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
raw = (raw & ~kAddressTagMask) | (tag << kAddressTagOffset);
return (T)raw;
}
template <typename T>
static uint64_t GetPointerTag(T pointer) {
// Use C-style casts to get static_cast behaviour for integral types (T),
// and reinterpret_cast behaviour for other types.
uint64_t raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
return (raw & kAddressTagMask) >> kAddressTagOffset;
}
private:
// Return the content of the cache type register.
static uint32_t GetCacheType();
// I and D cache line size in bytes.
static unsigned icache_line_size_;
static unsigned dcache_line_size_;
};
} // namespace vixl
#endif // VIXL_CPU_A64_H
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