/*
 * Copyright 2018 The Hafnium Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "hf/arch/cpu.h"
#include "hf/arch/std.h"
#include "hf/arch/vm/interrupts_gicv3.h"

#include "hf/spci.h"

#include "vmapi/hf/call.h"

#include "../msr.h"
#include "hftest.h"

static void irq(void)
{
	hf_interrupt_get();
}

static void wait_for_vm(uint32_t vmid)
{
	for (;;) {
		int64_t w = hf_mailbox_writable_get();
		if (w == vmid) {
			return;
		}

		if (w == -1) {
			interrupt_wait();
			arch_irq_enable();
			arch_irq_disable();
		}
	}
}

TEST_SERVICE(echo_with_notification)
{
	exception_setup(irq);
	hf_interrupt_enable(HF_MAILBOX_WRITABLE_INTID, true);

	/* Loop, echo messages back to the sender. */
	for (;;) {
		spci_msg_recv(SPCI_MSG_RECV_BLOCK);

		struct spci_message *send_buf = SERVICE_SEND_BUFFER();
		struct spci_message *recv_buf = SERVICE_RECV_BUFFER();

		memcpy(send_buf->payload, recv_buf->payload, recv_buf->length);
		spci_message_init(send_buf, recv_buf->length,
				  recv_buf->source_vm_id,
				  recv_buf->target_vm_id);

		while (spci_msg_send(SPCI_MSG_SEND_NOTIFY) != SPCI_SUCCESS) {
			wait_for_vm(recv_buf->source_vm_id);
		}

		hf_mailbox_clear();
	}
}