FastMemory.cpp

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// SPDX-License-Identifier: BSD-3-Clause
//
// This file is part of ETISS. It is licensed under the BSD 3-Clause License; you may not use this file except in
// compliance with the License. You should have received a copy of the license along with this project. If not, see the
// LICENSE file.
 
#include "etiss/FastMemory.h"
#include "etiss/jit/ReturnCode.h"
#include "etiss/jit/System.h"
#include <cstring>
 
static etiss_int32 system_call_iread(void *handle, ETISS_CPU *cpu, etiss_uint64 addr, etiss_uint32 length)
{
    return 0;
}
static etiss_int32 system_call_iwrite(void *handle, ETISS_CPU *cpu, etiss_uint64 addr, etiss_uint8 *buffer,
                                      etiss_uint32 length)
{
    return etiss::RETURNCODE::IBUS_WRITE_ERROR;
}
 
static etiss_int32 system_call_dread(void *handle, ETISS_CPU *cpu, etiss_uint64 addr, etiss_uint8 *buffer,
                                     etiss_uint32 length)
{
    memcpy(buffer, ((uint8_t *)handle) + (size_t)addr, length);
    return 0;
}
static etiss_int32 system_call_dwrite(void *handle, ETISS_CPU *cpu, etiss_uint64 addr, etiss_uint8 *buffer,
                                      etiss_uint32 length)
{
    memcpy(((uint8_t *)handle) + (size_t)addr, buffer, length);
    return 0;
}
 
static etiss_int32 system_call_dbg_read(void *handle, etiss_uint64 addr, etiss_uint8 *buffer, etiss_uint32 length)
{
    memcpy(buffer, ((uint8_t *)handle) + (size_t)addr, length);
    return 0;
}
 
static etiss_int32 system_call_dbg_write(void *handle, etiss_uint64 addr, etiss_uint8 *buffer, etiss_uint32 length)
{
    memcpy(((uint8_t *)handle) + (size_t)addr, buffer, length);
    return 0;
}
 
static void system_call_syncTime(void *handle, ETISS_CPU *cpu) {}
 
std::shared_ptr<ETISS_System> etiss::createFastMemory(size_t size)
{
    auto ret = std::make_shared<ETISS_System>();
 
    ret->iread = &system_call_iread;
    ret->iwrite = &system_call_iwrite;
 
    ret->dread = &system_call_dread;
    ret->dwrite = &system_call_dwrite;
 
    ret->dbg_read = &system_call_dbg_read;
    ret->dbg_write = &system_call_dbg_write;
 
    ret->syncTime = &system_call_syncTime;
 
    ret->handle = new uint8_t[size];
 
    return ret;
}