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[Kernel] Implement NtReadFileScatter via adding XFile::ReadScatter

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This commit is contained in:
emoose
2020-12-28 23:32:30 +00:00
committed by Rick Gibbed
parent 0400eba274
commit 4b13ecb752
3 changed files with 147 additions and 0 deletions
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56
src/xenia/kernel/xfile.cc
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@@ -178,6 +178,62 @@ X_STATUS XFile::Read(uint32_t buffer_guest_address, uint32_t buffer_length,
return result;
}
X_STATUS XFile::ReadScatter(uint32_t segments_guest_address, uint32_t length,
uint64_t byte_offset, uint32_t* out_bytes_read,
uint32_t apc_context) {
X_STATUS result = X_STATUS_SUCCESS;
// segments points to an array of buffer pointers of type
// "FILE_SEGMENT_ELEMENT", but they can just be treated as normal pointers
xe::be<uint32_t>* segments = reinterpret_cast<xe::be<uint32_t>*>(
memory()->TranslateVirtual(segments_guest_address));
// TODO: not sure if this is meant to change depending on buffer address?
// (only game seen using this always seems to use 4096-byte buffers)
uint32_t page_size = 4096;
uint32_t read_total = 0;
uint32_t read_remain = length;
while (read_remain) {
uint32_t read_length = read_remain;
uint32_t read_buffer = *segments;
if (read_length > page_size) {
read_length = page_size;
segments++;
}
uint32_t bytes_read = 0;
result = Read(read_buffer, read_length,
byte_offset ? ((byte_offset != -1 && byte_offset != -2)
? byte_offset + read_total
: byte_offset)
: -1,
&bytes_read, apc_context, false);
if (result != X_STATUS_SUCCESS) {
break;
}
read_total += bytes_read;
read_remain -= read_length;
}
if (out_bytes_read) {
*out_bytes_read = uint32_t(read_total);
}
XIOCompletion::IONotification notify;
notify.apc_context = apc_context;
notify.num_bytes = uint32_t(read_total);
notify.status = result;
NotifyIOCompletionPorts(notify);
async_event_->Set();
return result;
}
X_STATUS XFile::Write(uint32_t buffer_guest_address, uint32_t buffer_length,
uint64_t byte_offset, uint32_t* out_bytes_written,
uint32_t apc_context) {