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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* 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.
*/
//#define PATA_DEVICE_DEBUG
#include <AK/Memory.h>
#include <AK/StringView.h>
#include <Kernel/Devices/PATAChannel.h>
#include <Kernel/Devices/PATADiskDevice.h>
#include <Kernel/FileSystem/FileDescription.h>
namespace Kernel {
NonnullRefPtr<PATADiskDevice> PATADiskDevice::create(PATAChannel& channel, DriveType type, int major, int minor)
{
return adopt(*new PATADiskDevice(channel, type, major, minor));
}
PATADiskDevice::PATADiskDevice(PATAChannel& channel, DriveType type, int major, int minor)
: BlockDevice(major, minor, 512)
, m_drive_type(type)
, m_channel(channel)
{
}
PATADiskDevice::~PATADiskDevice()
{
}
const char* PATADiskDevice::class_name() const
{
return "PATADiskDevice";
}
bool PATADiskDevice::read_blocks(unsigned index, u16 count, u8* out)
{
if (!m_channel.m_bus_master_base.is_null() && m_channel.m_dma_enabled.resource())
return read_sectors_with_dma(index, count, out);
return read_sectors(index, count, out);
}
bool PATADiskDevice::write_blocks(unsigned index, u16 count, const u8* data)
{
if (!m_channel.m_bus_master_base.is_null() && m_channel.m_dma_enabled.resource())
return write_sectors_with_dma(index, count, data);
for (unsigned i = 0; i < count; ++i) {
if (!write_sectors(index + i, 1, data + i * 512))
return false;
}
return true;
}
void PATADiskDevice::set_drive_geometry(u16 cyls, u16 heads, u16 spt)
{
m_cylinders = cyls;
m_heads = heads;
m_sectors_per_track = spt;
}
ssize_t PATADiskDevice::read(FileDescription& fd, u8* outbuf, ssize_t len)
{
unsigned index = fd.offset() / block_size();
u16 whole_blocks = len / block_size();
ssize_t remaining = len % block_size();
unsigned blocks_per_page = PAGE_SIZE / block_size();
// PATAChannel will chuck a wobbly if we try to read more than PAGE_SIZE
// at a time, because it uses a single page for its DMA buffer.
if (whole_blocks >= blocks_per_page) {
whole_blocks = blocks_per_page;
remaining = 0;
}
#ifdef PATA_DEVICE_DEBUG
klog() << "PATADiskDevice::read() index=" << index << " whole_blocks=" << whole_blocks << " remaining=" << remaining;
#endif
if (whole_blocks > 0) {
if (!read_blocks(index, whole_blocks, outbuf))
return -1;
}
off_t pos = whole_blocks * block_size();
if (remaining > 0) {
auto buf = ByteBuffer::create_uninitialized(block_size());
if (!read_blocks(index + whole_blocks, 1, buf.data()))
return pos;
memcpy(&outbuf[pos], buf.data(), remaining);
}
return pos + remaining;
}
bool PATADiskDevice::can_read(const FileDescription& fd) const
{
return static_cast<unsigned>(fd.offset()) < (m_cylinders * m_heads * m_sectors_per_track * block_size());
}
ssize_t PATADiskDevice::write(FileDescription& fd, const u8* inbuf, ssize_t len)
{
unsigned index = fd.offset() / block_size();
u16 whole_blocks = len / block_size();
ssize_t remaining = len % block_size();
unsigned blocks_per_page = PAGE_SIZE / block_size();
// PATAChannel will chuck a wobbly if we try to write more than PAGE_SIZE
// at a time, because it uses a single page for its DMA buffer.
if (whole_blocks >= blocks_per_page) {
whole_blocks = blocks_per_page;
remaining = 0;
}
#ifdef PATA_DEVICE_DEBUG
klog() << "PATADiskDevice::write() index=" << index << " whole_blocks=" << whole_blocks << " remaining=" << remaining;
#endif
if (whole_blocks > 0) {
if (!write_blocks(index, whole_blocks, inbuf))
return -1;
}
off_t pos = whole_blocks * block_size();
// since we can only write in block_size() increments, if we want to do a
// partial write, we have to read the block's content first, modify it,
// then write the whole block back to the disk.
if (remaining > 0) {
auto buf = ByteBuffer::create_zeroed(block_size());
if (!read_blocks(index + whole_blocks, 1, buf.data()))
return pos;
memcpy(buf.data(), &inbuf[pos], remaining);
if (!write_blocks(index + whole_blocks, 1, buf.data()))
return pos;
}
return pos + remaining;
}
bool PATADiskDevice::can_write(const FileDescription& fd) const
{
return static_cast<unsigned>(fd.offset()) < (m_cylinders * m_heads * m_sectors_per_track * block_size());
}
bool PATADiskDevice::read_sectors_with_dma(u32 lba, u16 count, u8* outbuf)
{
return m_channel.ata_read_sectors_with_dma(lba, count, outbuf, is_slave());
}
bool PATADiskDevice::read_sectors(u32 start_sector, u16 count, u8* outbuf)
{
return m_channel.ata_read_sectors(start_sector, count, outbuf, is_slave());
}
bool PATADiskDevice::write_sectors_with_dma(u32 lba, u16 count, const u8* inbuf)
{
return m_channel.ata_write_sectors_with_dma(lba, count, inbuf, is_slave());
}
bool PATADiskDevice::write_sectors(u32 start_sector, u16 count, const u8* inbuf)
{
return m_channel.ata_write_sectors(start_sector, count, inbuf, is_slave());
}
bool PATADiskDevice::is_slave() const
{
return m_drive_type == DriveType::Slave;
}
}
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