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#include "devices/storage/RAMDisk/RAMDiskDevice.hpp"
#include "kapi/boot_module/boot_module.hpp"
#include "kapi/system.hpp"
#include "devices/BlockDevice.hpp"
#include <kstd/cstring>
#include <cstddef>
namespace devices::storage::ram_disk
{
ram_disk_device::ram_disk_device() // TODO BA-FS26 remove when kstd::vector is available
: block_device(0, 0)
{}
ram_disk_device::ram_disk_device(kapi::boot_modules::boot_module const & module, size_t major, size_t minor)
: block_device(major, minor)
, m_boot_module(module)
{}
auto ram_disk_device::read_block(size_t block_index, void * buffer) const -> void
{
if (buffer == nullptr)
{
kapi::system::panic("[RAM DISK DEVICE] read_block called with null buffer.");
}
size_t const offset = block_index * block_size;
size_t const limit = m_boot_module.size;
size_t const available = (offset < limit) ? (limit - offset) : 0;
size_t const to_copy = (available < block_size) ? available : block_size;
if (to_copy > 0)
{
auto const source = static_cast<std::byte const *>(m_boot_module.start_address) + offset;
kstd::libc::memcpy(buffer, source, to_copy);
}
if (to_copy < block_size)
{
kstd::libc::memset(static_cast<std::byte *>(buffer) + to_copy, std::byte{0}, block_size - to_copy);
}
}
auto ram_disk_device::write_block(size_t block_index, void const * buffer) -> void
{
if (buffer == nullptr)
{
kapi::system::panic("[RAM DISK DEVICE] write_block called with null buffer.");
}
size_t const offset = block_index * block_size;
size_t const limit = m_boot_module.size;
if (offset >= limit)
return;
size_t const available = limit - offset;
size_t const to_write = (available < block_size) ? available : block_size;
auto const destination = static_cast<std::byte *>(m_boot_module.start_address) + offset;
kstd::libc::memcpy(destination, buffer, to_write);
}
} // namespace devices::storage::ram_disk
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