[zion] Move ipc syscalls to one file to prep refactor

zion/syscall/ipc.cpp

@@ -0,0 +1,139 @@
+#include "syscall/ipc.h"
+
+#include "capability/capability.h"
+#include "interrupt/interrupt.h"
+#include "object/endpoint.h"
+#include "object/reply_port.h"
+#include "scheduler/scheduler.h"
+
+z_err_t ChannelCreate(ZChannelCreateReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto chan_pair = Channel::CreateChannelPair();
+  *req->channel1 = proc.AddNewCapability(chan_pair.first(), ZC_WRITE | ZC_READ);
+  *req->channel2 =
+      proc.AddNewCapability(chan_pair.second(), ZC_WRITE | ZC_READ);
+  return glcr::OK;
+}
+
+z_err_t ChannelSend(ZChannelSendReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto chan_cap = proc.GetCapability(req->chan_cap);
+  RET_ERR(ValidateCapability<Channel>(chan_cap, ZC_WRITE));
+
+  auto chan = chan_cap->obj<Channel>();
+  return chan->Write(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+
+z_err_t ChannelRecv(ZChannelRecvReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto chan_cap = proc.GetCapability(req->chan_cap);
+  RET_ERR(ValidateCapability<Channel>(chan_cap, ZC_READ));
+
+  auto chan = chan_cap->obj<Channel>();
+  return chan->Read(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+
+z_err_t PortCreate(ZPortCreateReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto port = glcr::MakeRefCounted<Port>();
+  *req->port_cap = proc.AddNewCapability(port, ZC_WRITE | ZC_READ);
+  return glcr::OK;
+}
+
+z_err_t PortSend(ZPortSendReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto port_cap = proc.GetCapability(req->port_cap);
+  RET_ERR(ValidateCapability<Port>(port_cap, ZC_WRITE));
+
+  auto port = port_cap->obj<Port>();
+  return port->Write(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+
+z_err_t PortRecv(ZPortRecvReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto port_cap = proc.GetCapability(req->port_cap);
+  RET_ERR(ValidateCapability<Port>(port_cap, ZC_READ));
+
+  auto port = port_cap->obj<Port>();
+  ZMessage message{
+      .num_bytes = *req->num_bytes,
+      .data = const_cast<void*>(req->data),
+      .num_caps = *req->num_caps,
+      .caps = req->caps,
+  };
+  return port->Read(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+
+z_err_t PortPoll(ZPortPollReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto port_cap = proc.GetCapability(req->port_cap);
+  RET_ERR(ValidateCapability<Port>(port_cap, ZC_READ));
+
+  auto port = port_cap->obj<Port>();
+  // FIXME: Race condition here where this call could block if the last message
+  // is removed between this check and the port read.
+  if (!port->HasMessages()) {
+    return glcr::EMPTY;
+  }
+  return port->Read(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+
+z_err_t IrqRegister(ZIrqRegisterReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  if (req->irq_num != Z_IRQ_PCI_BASE) {
+    // FIXME: Don't hardcode this nonsense.
+    return glcr::UNIMPLEMENTED;
+  }
+  glcr::RefPtr<Port> port = glcr::MakeRefCounted<Port>();
+  *req->port_cap = proc.AddNewCapability(port, ZC_READ | ZC_WRITE);
+  RegisterPciPort(port);
+  return glcr::OK;
+}
+
+glcr::ErrorCode EndpointCreate(ZEndpointCreateReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  *req->endpoint_cap =
+      proc.AddNewCapability(Endpoint::Create(), ZC_READ | ZC_WRITE);
+  return glcr::OK;
+}
+
+glcr::ErrorCode EndpointSend(ZEndpointSendReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+
+  auto endpoint_cap = proc.GetCapability(req->endpoint_cap);
+  ValidateCapability<Endpoint>(endpoint_cap, ZC_WRITE);
+  auto endpoint = endpoint_cap->obj<Endpoint>();
+
+  auto reply_port = ReplyPort::Create();
+  *req->reply_port_cap = proc.AddNewCapability(reply_port, ZC_READ);
+  uint64_t reply_port_cap_to_send = proc.AddNewCapability(reply_port, ZC_WRITE);
+  return endpoint->Write(req->num_bytes, req->data, reply_port_cap_to_send);
+}
+
+glcr::ErrorCode EndpointRecv(ZEndpointRecvReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+
+  auto endpoint_cap = proc.GetCapability(req->endpoint_cap);
+  ValidateCapability<Endpoint>(endpoint_cap, ZC_READ);
+  auto endpoint = endpoint_cap->obj<Endpoint>();
+
+  return endpoint->Read(req->num_bytes, req->data, req->reply_port_cap);
+}
+
+glcr::ErrorCode ReplyPortSend(ZReplyPortSendReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+  auto reply_port_cap = proc.GetCapability(req->reply_port_cap);
+  ValidateCapability<ReplyPort>(reply_port_cap, ZC_WRITE);
+  auto reply_port = reply_port_cap->obj<ReplyPort>();
+
+  return reply_port->Write(req->num_bytes, req->data, req->num_caps, req->caps);
+}
+glcr::ErrorCode ReplyPortRecv(ZReplyPortRecvReq* req) {
+  auto& proc = gScheduler->CurrentProcess();
+
+  auto reply_port_cap = proc.GetCapability(req->reply_port_cap);
+  ValidateCapability<ReplyPort>(reply_port_cap, ZC_READ);
+  auto reply_port = reply_port_cap->obj<ReplyPort>();
+
+  return reply_port->Read(req->num_bytes, req->data, req->num_caps, req->caps);
+}