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Kernel: Add support for reading from VirtIOConsole

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This allows two-way communication with the host through a VirtIOConsole.
This is necessary for features like clipboard sharing.
This commit is contained in:
x-yl 2021-06-20 17:46:04 +04:00 • committed by Ali Mohammad Pur
parent 1c06d77262
commit 1492bb2fd6
5 changed files with 74 additions and 8 deletions
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19
Kernel/VM/RingBuffer.cpp
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@ -30,6 +30,25 @@ bool RingBuffer::copy_data_in(const UserOrKernelBuffer& buffer, size_t offset, s
return false;
}
KResultOr<size_t> RingBuffer::copy_data_out(size_t size, UserOrKernelBuffer& buffer) const
{
auto start = m_start_of_used % m_capacity_in_bytes;
auto num_bytes = min(min(m_num_used_bytes, size), m_capacity_in_bytes - start);
if (!buffer.write(m_region->vaddr().offset(start).as_ptr(), num_bytes))
return EIO;
return num_bytes;
}
KResultOr<PhysicalAddress> RingBuffer::reserve_space(size_t size)
{
if (m_capacity_in_bytes < m_num_used_bytes + size)
return ENOSPC;
size_t start_of_free_area = (m_start_of_used + m_num_used_bytes) % m_capacity_in_bytes;
m_num_used_bytes += size;
PhysicalAddress start_of_reserved_space = m_region->physical_page(start_of_free_area / PAGE_SIZE)->paddr().offset(start_of_free_area % PAGE_SIZE);
return start_of_reserved_space;
}
void RingBuffer::reclaim_space(PhysicalAddress chunk_start, size_t chunk_size)
{
VERIFY(start_of_used() == chunk_start);