static struct SectorCache *
cache_fetch(uint_32 sector) {
//printk("enter cache_fetch\n");
struct SectorCache *ptr = &cache[sector % NR_SEC_CACHE];
if (ptr->used == TRUE && ptr->sector == sector) {
//printk("hit\n");
/* cache hit, do nothing */
} else {
//printk("miss\n");
if (ptr->used == TRUE && ptr->dirty == TRUE) {
/* write back */
ide_prepare(ptr->sector);
do_write(&ptr->content);
}
/* issue a read command */
ide_prepare(sector);
issue_read();
do_read(&ptr->content);
ptr->used = TRUE;
ptr->sector = sector;
ptr->dirty = FALSE;
}
return ptr;
}
void serial_com::handle_read(
const boost::system::error_code& ec,
std::size_t bytes_transferred){
if(!ec){
// std::cout << std::string(read_buffer,bytes_transferred) << " " << bytes_transferred << "\n";
if(data_handler)
data_handler->handle_data(std::string(read_buffer,bytes_transferred));
issue_read();
}else if(data_handler){
data_handler->handle_data("\n*\n*Error in serial read\n*\n*\n");
}
}
void
disk_do_read(void *buf, uint32_t sector) {
int i;
ide_prepare(sector);
issue_read();
waitdisk();
for (i = 0; i < 512 / sizeof(uint32_t); i ++) {
*(((uint32_t*)buf) + i) = in_long(IDE_PORT_BASE);
}
}
serial_com( UM2ListenerApp* handler = nullptr ):
io(),
port(io, "/dev/ttyACM0"),
is_shutting_down(false),
io_thread(nullptr),
data_handler( handler )
{
port.set_option( boost::asio::serial_port::baud_rate( 115200 ) );
port.set_option( boost::asio::serial_port::flow_control( boost::asio::serial_port::flow_control::none ) );
port.set_option( boost::asio::serial_port::parity( boost::asio::serial_port::parity::none ) );
port.set_option( boost::asio::serial_port::stop_bits( boost::asio::serial_port::stop_bits::one ) );
port.set_option( boost::asio::serial_port::character_size( 8 ) );
io.post( [this](){issue_read();} );
io_thread = new std::thread( [this](){ io.run(); } );
}
