/*
 * FS0. Filesystem implementation
 *
 * Copyright (C) 2007 Bahadir Balban
 */
#include <stdio.h>
#include <string.h>
#include <l4lib/arch/message.h>
#include <l4lib/arch/syscalls.h>
#include <l4lib/kip.h>
#include <l4lib/utcb.h>
#include <l4lib/ipcdefs.h>
#include <fs.h>

/* Synchronise with pager via a `wait' tagged ipc with destination as pager */
void wait_pager(l4id_t partner)
{
	u32 tag = L4_IPC_TAG_WAIT;
	printf("Going to wait till pager finishes dumping.\n");
	l4_ipc(partner, l4_nilthread, tag);
	printf("Pager synced with us.\n");
}

void fs_request_handler(struct fs_request *fsreq)
{

}

void handle_fs_requests(void)
{
	u32 mr[MR_UNUSED_TOTAL];
	l4id_t sender;
	int err;
	u32 tag;

	printf("%s: Listening requests.\n", __TASKNAME__);

	if ((err = l4_receive(L4_ANYTHREAD)) < 0) {
		printf("%s: %s: IPC Error: %d. Quitting...\n", __TASKNAME__,
		       __FUNCTION__, err);
		BUG();
	}

	/* Read conventional ipc data */
	tag = l4_get_tag();
	sender = l4_get_sender();

	/* Read mrs not used by syslib */
	for (int i = 0; i < MR_UNUSED_TOTAL; i++)
		mr[i] = read_mr(i);

	switch(tag) {
	case L4_IPC_TAG_WAIT:
		printf("%s: Synced with waiting thread.\n", __TASKNAME__);
		break;
	case L4_IPC_TAG_OPEN:
		sys_open(sender, (void *)mr[0], (int)mr[1], (u32)mr[2]);
		break;
	case L4_IPC_TAG_READ:
		sys_read(sender, (int)mr[0], (void *)mr[1], (int)mr[2]);
		break;
	case L4_IPC_TAG_WRITE:
		sys_write(sender, (int)mr[0], (void *)mr[1], (int)mr[2]);
		break;
	case L4_IPC_TAG_LSEEK:
		sys_lseek(sender, (int)mr[0], (int)mr[1], (int)mr[2]);
		break;
	default:
		printf("%s: Unrecognised ipc tag (%d)"
		       "received. Ignoring.\n", __TASKNAME__, mr[MR_TAG]);
	}
}

void main(void)
{
	wait_pager(PAGER_TID);

	while (1) {
		handle_fs_requests();
	}
}