libc/src/gpu/rpc_host_call.cpp

   1 //===---------- GPU implementation of the external RPC call function ------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/gpu/rpc_host_call.h"
  10
  11 #include "src/__support/GPU/utils.h"
  12 #include "src/__support/RPC/rpc_client.h"
  13 #include "src/__support/common.h"
  14 #include "src/__support/macros/config.h"
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 // This calls the associated function pointer on the RPC server with the given
  19 // arguments. We expect that the pointer here is a valid pointer on the server.
  20 LLVM_LIBC_FUNCTION(unsigned long long, rpc_host_call,
  21                    (void *fn, void *data, size_t size)) {
  22   rpc::Client::Port port = rpc::client.open<RPC_HOST_CALL>();
  23   port.send_n(data, size);
  24   port.send([=](rpc::Buffer *buffer, uint32_t) {
  25     buffer->data[0] = reinterpret_cast<uintptr_t>(fn);
  26   });
  27   unsigned long long ret;
  28   port.recv([&](rpc::Buffer *buffer, uint32_t) {
  29     ret = static_cast<unsigned long long>(buffer->data[0]);
  30   });
  31   port.close();
  32   return ret;
  33 }
  34
  35 } // namespace LIBC_NAMESPACE_DECL