acadia/zion/syscall/port.cpp

63 lines
2.0 KiB
C++

#include "syscall/port.h"
#include "capability/capability.h"
#include "interrupt/interrupt.h"
#include "scheduler/scheduler.h"
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 Z_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 Z_ERR_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 Z_ERR_UNIMPLEMENTED;
}
glcr::RefPtr<Port> port = glcr::MakeRefCounted<Port>();
*req->port_cap = proc.AddNewCapability(port, ZC_READ | ZC_WRITE);
RegisterPciPort(port);
return Z_OK;
}