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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 HOLDER 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.
*/
#include <Kernel/VirtIO/VirtIOConsole.h>
namespace Kernel {
VirtIOConsole::VirtIOConsole(PCI::Address address)
: CharacterDevice(229, 0)
, VirtIODevice(address, "VirtIOConsole")
{
if (auto cfg = get_config(ConfigurationType::Device)) {
bool success = negotiate_features([&](u64 supported_features) {
u64 negotiated = 0;
if (is_feature_set(supported_features, VIRTIO_CONSOLE_F_SIZE))
dbgln("VirtIOConsole: Console size is not yet supported!");
if (is_feature_set(supported_features, VIRTIO_CONSOLE_F_MULTIPORT))
dbgln("VirtIOConsole: Multi port is not yet supported!");
return negotiated;
});
if (success) {
u32 max_nr_ports = 0;
u16 cols = 0, rows = 0;
read_config_atomic([&]() {
if (is_feature_accepted(VIRTIO_CONSOLE_F_SIZE)) {
cols = config_read16(*cfg, 0x0);
rows = config_read16(*cfg, 0x2);
}
if (is_feature_accepted(VIRTIO_CONSOLE_F_MULTIPORT)) {
max_nr_ports = config_read32(*cfg, 0x4);
}
});
dbgln("VirtIOConsole: cols: {}, rows: {}, max nr ports {}", cols, rows, max_nr_ports);
set_requested_queue_count(2 + max_nr_ports * 2); // base receiveq/transmitq for port0 + 2 per every additional port
success = finish_init();
}
if (success) {
get_queue(RECEIVEQ).on_data_available = [&]() {
dbgln("VirtIOConsole: receive_queue on_data_available");
};
get_queue(TRANSMITQ).on_data_available = [&]() {
dbgln("VirtIOConsole: send_queue on_data_available");
};
dbgln("TODO: Populate receive queue with a receive buffer");
}
}
}
VirtIOConsole::~VirtIOConsole()
{
}
bool VirtIOConsole::handle_device_config_change()
{
dbgln("VirtIOConsole: Handle device config change");
return true;
}
bool VirtIOConsole::can_read(const FileDescription&, size_t) const
{
return false;
}
KResultOr<size_t> VirtIOConsole::read(FileDescription&, u64, [[maybe_unused]] UserOrKernelBuffer& data, size_t size)
{
if (!size)
return 0;
return 1;
}
bool VirtIOConsole::can_write(const FileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> VirtIOConsole::write(FileDescription&, u64, const UserOrKernelBuffer& data, size_t size)
{
if (!size)
return 0;
dbgln("VirtIOConsole: Write with size {}, kernel: {}", size, data.is_kernel_buffer());
ssize_t nread = data.read_buffered<256>(size, [&](const u8* bytes, size_t bytes_count) {
supply_buffer_and_notify(TRANSMITQ, bytes, bytes_count, BufferType::DeviceReadable);
return (ssize_t)bytes_count;
});
if (nread < 0)
return Kernel::KResult((ErrnoCode)-nread);
return (size_t)nread;
}
}
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