LLE Mapped Buffer: addressed comments
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NarcolepticK
parent
19291ba465
commit
51d53a6281
4 changed files with 140 additions and 76 deletions
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@ -33,6 +33,17 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
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std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
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Memory::ReadBlock(*src_process, src_address, cmd_buf.data(), command_size * sizeof(u32));
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// Create a copy of the target's command buffer
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IPC::Header dst_header;
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Memory::ReadBlock(*dst_process, dst_address, &dst_header.raw, sizeof(dst_header.raw));
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std::size_t dst_untranslated_size = 1u + dst_header.normal_params_size;
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std::size_t dst_command_size = dst_untranslated_size + dst_header.translate_params_size;
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std::array<u32, IPC::COMMAND_BUFFER_LENGTH> dst_cmd_buf;
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Memory::ReadBlock(*dst_process, dst_address, dst_cmd_buf.data(),
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dst_command_size * sizeof(u32));
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std::size_t i = untranslated_size;
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while (i < command_size) {
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u32 descriptor = cmd_buf[i];
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@ -128,36 +139,63 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
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u32 num_pages =
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Common::AlignUp(page_offset + size, Memory::PAGE_SIZE) >> Memory::PAGE_BITS;
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// Skip when the size is zero
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// Skip when the size is zero and num_pages == 0
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if (size == 0) {
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i += 1;
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cmd_buf[i++] = 0;
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break;
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}
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ASSERT(num_pages >= 1);
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if (reply) {
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// TODO(Subv): Scan the target's command buffer to make sure that there was a
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// MappedBuffer descriptor in the original request. The real kernel panics if you
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// try to reply with an unsolicited MappedBuffer.
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// Scan the target's command buffer for the matching mapped buffer
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std::size_t j = dst_untranslated_size;
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while (j < dst_command_size) {
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u32 desc = dst_cmd_buf[j++];
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// Unmap the buffers. Readonly buffers do not need to be copied over to the target
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// process again because they were (presumably) not modified. This behavior is
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// consistent with the real kernel.
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if (permissions == IPC::MappedBufferPermissions::R) {
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ResultCode result = src_process->vm_manager.UnmapRange(
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page_start, num_pages * Memory::PAGE_SIZE);
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ASSERT(result == RESULT_SUCCESS);
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} else {
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const auto vma_iter = src_process->vm_manager.vma_map.find(source_address);
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const auto& vma = vma_iter->second;
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const VAddr dest_address = vma.originating_buffer_address;
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if (IPC::GetDescriptorType(desc) == IPC::DescriptorType::MappedBuffer) {
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IPC::MappedBufferDescInfo dest_descInfo{desc};
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VAddr dest_address = dst_cmd_buf[j];
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auto buffer = std::make_shared<std::vector<u8>>(size);
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Memory::ReadBlock(*src_process, source_address, buffer->data(), size);
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Memory::WriteBlock(*dst_process, dest_address, buffer->data(), size);
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u32 dest_size = static_cast<u32>(dest_descInfo.size);
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IPC::MappedBufferPermissions dest_permissions = dest_descInfo.perms;
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ResultCode result = src_process->vm_manager.UnmapRange(
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page_start, num_pages * Memory::PAGE_SIZE);
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ASSERT(result == RESULT_SUCCESS);
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if (permissions == dest_permissions && size == dest_size) {
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// Readonly buffers do not need to be copied over to the target
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// process again because they were (presumably) not modified. This
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// behavior is consistent with the real kernel.
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if (permissions != IPC::MappedBufferPermissions::R) {
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// Copy the modified buffer back into the target process
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Memory::CopyBlock(*src_process, *dst_process, source_address,
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dest_address, size);
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}
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// Unmap the Reserved page before the buffer
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ResultCode result = src_process->vm_manager.UnmapRange(
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page_start - Memory::PAGE_SIZE, Memory::PAGE_SIZE);
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ASSERT(result == RESULT_SUCCESS);
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// Unmap the buffer from the source process
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result = src_process->vm_manager.UnmapRange(
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page_start, num_pages * Memory::PAGE_SIZE);
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ASSERT(result == RESULT_SUCCESS);
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// Check if this is the last mapped buffer
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VAddr next_reserve = page_start + num_pages * Memory::PAGE_SIZE;
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auto& vma =
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src_process->vm_manager.FindVMA(next_reserve + Memory::PAGE_SIZE)
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->second;
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if (vma.type == VMAType::Free) {
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// Unmap the Reserved page after the last buffer
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result = src_process->vm_manager.UnmapRange(next_reserve,
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Memory::PAGE_SIZE);
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ASSERT(result == RESULT_SUCCESS);
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}
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break;
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}
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}
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j += 1;
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}
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i += 1;
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@ -166,63 +204,38 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
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VAddr target_address = 0;
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auto IsPageAligned = [](VAddr address) -> bool {
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return (address & Memory::PAGE_MASK) == 0;
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};
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// TODO(Subv): Perform permission checks.
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// TODO(Subv): Leave a page of unmapped memory before the first page and after the last
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// page.
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// Reserve a page of memory before the mapped buffer
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auto reserve_buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
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dst_process->vm_manager.MapMemoryBlockToBase(
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Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer, 0,
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static_cast<u32>(reserve_buffer->size()), Kernel::MemoryState::Reserved);
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if (num_pages == 1 && !IsPageAligned(source_address) &&
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!IsPageAligned(source_address + size)) {
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// If the address of the source buffer is not page-aligned or if the buffer doesn't
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// fill an entire page, then we have to allocate a page of memory in the target
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// process and copy over the data from the input buffer. This allocated buffer will
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// be copied back to the source process and deallocated when the server replies to
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// the request via ReplyAndReceive.
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auto buffer = std::make_shared<std::vector<u8>>(num_pages * Memory::PAGE_SIZE);
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Memory::ReadBlock(*src_process, source_address, buffer->data() + page_offset, size);
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auto buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
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// Number of bytes until the next page.
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std::size_t difference_to_page =
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Common::AlignUp(source_address, Memory::PAGE_SIZE) - source_address;
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// If the data fits in one page we can just copy the required size instead of the
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// entire page.
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std::size_t read_size =
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num_pages == 1 ? static_cast<std::size_t>(size) : difference_to_page;
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Memory::ReadBlock(*src_process, source_address, buffer->data() + page_offset,
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read_size);
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// Map the page into the target process' address space.
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target_address =
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dst_process->vm_manager
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.MapMemoryBlockToBase(Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE,
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buffer, 0, static_cast<u32>(buffer->size()),
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Kernel::MemoryState::Shared)
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.Unwrap();
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} else {
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auto buffer = std::make_shared<std::vector<u8>>(num_pages * Memory::PAGE_SIZE);
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Memory::ReadBlock(*src_process, source_address, buffer->data() + page_offset, size);
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// Map the pages into the target process' address space.
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target_address =
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dst_process->vm_manager
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.MapMemoryBlockToBase(Memory::IPC_MAPPING_VADDR + Memory::PAGE_SIZE,
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Memory::IPC_MAPPING_SIZE - Memory::PAGE_SIZE, buffer,
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0, static_cast<u32>(buffer->size()),
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Kernel::MemoryState::Shared)
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.Unwrap();
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}
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// Save the original address we copied the buffer from so that we can copy the modified
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// buffer back, if needed
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auto vma_iter = dst_process->vm_manager.vma_map.find(target_address + page_offset);
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auto& vma = vma_iter->second;
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vma.originating_buffer_address = source_address;
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// Map the page(s) into the target process' address space.
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target_address = dst_process->vm_manager
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.MapMemoryBlockToBase(
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Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, buffer, 0,
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static_cast<u32>(buffer->size()), Kernel::MemoryState::Shared)
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.Unwrap();
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cmd_buf[i++] = target_address + page_offset;
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// Check if this is the last mapped buffer
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if (i < command_size) {
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u32 next_descriptor = cmd_buf[i];
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if (IPC::GetDescriptorType(next_descriptor) == IPC::DescriptorType::MappedBuffer) {
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break;
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}
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}
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// Reserve a page of memory after the last mapped buffer
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dst_process->vm_manager.MapMemoryBlockToBase(
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Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer, 0,
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static_cast<u32>(reserve_buffer->size()), Kernel::MemoryState::Reserved);
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break;
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}
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default:
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