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#include <cassert>
#include <cstdint>
#include <memory>
#include "avalon.hpp"
#include "mem.hpp"
namespace taller::avalon
{
mem::mem(std::uint32_t base, std::uint32_t size)
: slave(base, size, 4),
block(std::make_unique<line[]>(size >> 4))
{}
bool mem::read_line(std::uint32_t addr, line &data, unsigned byte_enable [[maybe_unused]])
{
data = block[addr];
return true;/*ready();*/
}
bool mem::write_line(std::uint32_t addr, const line &data, unsigned byte_enable)
{
for (unsigned i = 0; i < 4; ++i) {
std::uint32_t bytes = 0;
if (byte_enable & 0b1000)
bytes |= 0xff << 24;
if (byte_enable & 0b0100)
bytes |= 0xff << 16;
if (byte_enable & 0b0010)
bytes |= 0xff << 8;
if (byte_enable & 0b0001)
bytes |= 0xff;
byte_enable >>= 4;
block[addr].words[i] = (data.words[i] & bytes) | (block[addr].words[i] & ~bytes);
}
return true;/*ready();*/
}
bool mem::ready() noexcept
{
count = count > 0 ? count - 1 : 2;
return count == 0;
}
}
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