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// See LICENSE for license details.
#include <algorithm>
#include <stdlib.h>
#include <string.h>
#include <stdexcept>
#include "memif.h"
void memif_t::read(addr_t addr, size_t len, void* bytes)
{
size_t align = cmemif->chunk_align();
if (len && (addr & (align-1)))
{
size_t this_len = std::min(len, align - size_t(addr & (align-1)));
uint8_t chunk[align];
cmemif->read_chunk(addr & ~(align-1), align, chunk);
memcpy(bytes, chunk + (addr & (align-1)), this_len);
bytes = (char*)bytes + this_len;
addr += this_len;
len -= this_len;
}
if (len & (align-1))
{
size_t this_len = len & (align-1);
size_t start = len - this_len;
uint8_t chunk[align];
cmemif->read_chunk(addr + start, align, chunk);
memcpy((char*)bytes + start, chunk, this_len);
len -= this_len;
}
// now we're aligned
for (size_t pos = 0; pos < len; pos += cmemif->chunk_max_size())
cmemif->read_chunk(addr + pos, std::min(cmemif->chunk_max_size(), len - pos), (char*)bytes + pos);
}
void memif_t::write(addr_t addr, size_t len, const void* bytes)
{
size_t align = cmemif->chunk_align();
if (len && (addr & (align-1)))
{
size_t this_len = std::min(len, align - size_t(addr & (align-1)));
uint8_t chunk[align];
cmemif->read_chunk(addr & ~(align-1), align, chunk);
memcpy(chunk + (addr & (align-1)), bytes, this_len);
cmemif->write_chunk(addr & ~(align-1), align, chunk);
bytes = (char*)bytes + this_len;
addr += this_len;
len -= this_len;
}
if (len & (align-1))
{
size_t this_len = len & (align-1);
size_t start = len - this_len;
uint8_t chunk[align];
cmemif->read_chunk(addr + start, align, chunk);
memcpy(chunk, (char*)bytes + start, this_len);
cmemif->write_chunk(addr + start, align, chunk);
len -= this_len;
}
// now we're aligned
bool all_zero = len != 0;
for (size_t i = 0; i < len; i++)
all_zero &= ((const char*)bytes)[i] == 0;
if (all_zero) {
cmemif->clear_chunk(addr, len);
} else {
size_t max_chunk = cmemif->chunk_max_size();
for (size_t pos = 0; pos < len; pos += max_chunk)
cmemif->write_chunk(addr + pos, std::min(max_chunk, len - pos), (char*)bytes + pos);
}
}
#define MEMIF_READ_FUNC \
if(addr & (sizeof(val)-1)) \
throw std::runtime_error("misaligned address"); \
this->read(addr, sizeof(val), &val); \
return val
#define MEMIF_WRITE_FUNC \
if(addr & (sizeof(val)-1)) \
throw std::runtime_error("misaligned address"); \
this->write(addr, sizeof(val), &val)
uint8_t memif_t::read_uint8(addr_t addr)
{
uint8_t val;
MEMIF_READ_FUNC;
}
int8_t memif_t::read_int8(addr_t addr)
{
int8_t val;
MEMIF_READ_FUNC;
}
void memif_t::write_uint8(addr_t addr, uint8_t val)
{
MEMIF_WRITE_FUNC;
}
void memif_t::write_int8(addr_t addr, int8_t val)
{
MEMIF_WRITE_FUNC;
}
uint16_t memif_t::read_uint16(addr_t addr)
{
uint16_t val;
MEMIF_READ_FUNC;
}
int16_t memif_t::read_int16(addr_t addr)
{
int16_t val;
MEMIF_READ_FUNC;
}
void memif_t::write_uint16(addr_t addr, uint16_t val)
{
MEMIF_WRITE_FUNC;
}
void memif_t::write_int16(addr_t addr, int16_t val)
{
MEMIF_WRITE_FUNC;
}
uint32_t memif_t::read_uint32(addr_t addr)
{
uint32_t val;
MEMIF_READ_FUNC;
}
int32_t memif_t::read_int32(addr_t addr)
{
int32_t val;
MEMIF_READ_FUNC;
}
void memif_t::write_uint32(addr_t addr, uint32_t val)
{
MEMIF_WRITE_FUNC;
}
void memif_t::write_int32(addr_t addr, int32_t val)
{
MEMIF_WRITE_FUNC;
}
uint64_t memif_t::read_uint64(addr_t addr)
{
uint64_t val;
MEMIF_READ_FUNC;
}
int64_t memif_t::read_int64(addr_t addr)
{
int64_t val;
MEMIF_READ_FUNC;
}
void memif_t::write_uint64(addr_t addr, uint64_t val)
{
MEMIF_WRITE_FUNC;
}
void memif_t::write_int64(addr_t addr, int64_t val)
{
MEMIF_WRITE_FUNC;
}
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