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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/sys/vfs/vfs_main.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2010,2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* 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 */
/* */
/* http://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. */
/* */
/* IBM_PROLOG_END_TAG */
#include <string.h>
#include <errno.h>
#include <sys/msg.h>
#include <sys/vfs.h>
#include <sys/task.h>
#include <sys/sync.h>
#include <util/locked/list.H>
#include <kernel/console.H> // TODO : Remove this.
const char* VFS_ROOT = "/";
const char* VFS_ROOT_BIN = "/bin/";
const char* VFS_ROOT_DATA = "/data/";
const char* VFS_ROOT_MSG = "/msg/";
const char* VFS_ROOT_MSG_VFS = "/msg/vfs";
const char* VFS_ROOT_MSG_MBOX = "/msg/mbox";
void vfs_module_init();
struct VfsPath
{
char key[64];
bool operator!=(VfsPath& r) { return 0 != strcmp(key, r.key); };
};
struct VfsEntry
{
typedef VfsPath key_type;
key_type key;
msg_q_t msg_q;
VfsEntry* next;
VfsEntry* prev;
};
void* vfs_main(void* i_barrier)
{
// Detach this task from the parent
task_detach();
barrier_t * barrier = (barrier_t *)i_barrier;
// Create message queue, register with kernel.
msg_q_t vfsMsgQ = msg_q_create();
msg_q_register(vfsMsgQ, VFS_ROOT);
printk("done.\n");
// Initalize modules.
vfs_module_init();
// Signal with sys/init to continue on.
barrier_wait(barrier);
Util::Locked::List<VfsEntry, VfsEntry::key_type> vfsContents;
while(1)
{
msg_t* msg = msg_wait(vfsMsgQ);
switch(msg->type)
{
case VFS_MSG_REGISTER_MSGQ:
{
VfsEntry* e = new VfsEntry();
strcpy(e->key.key, (char*) msg->extra_data);
e->msg_q = (msg_q_t) msg->data[0];
vfsContents.insert(e);
printkd("VFS: Registering %p as %s\n",
e->msg_q, e->key.key);
msg_respond(vfsMsgQ, msg);
}
break;
case VFS_MSG_REMOVE_MSGQ:
{
VfsEntry::key_type k;
strcpy(k.key, (char*) msg->extra_data);
VfsEntry* e = vfsContents.find(k);
if(NULL != e)
{
msg->data[0] = 0; //(uint64_t) e->msg_q;
printkd("VFS: Removing msg queue %s\n",e->key.key);
vfsContents.erase(e);
delete e;
}
else
{
msg->data[0] = (uint64_t) (-ENXIO);
}
msg_respond(vfsMsgQ, msg);
}
break;
case VFS_MSG_RESOLVE_MSGQ:
{
VfsEntry::key_type k;
strcpy(k.key, (char*) msg->extra_data);
VfsEntry* e = vfsContents.find(k);
if (NULL == e)
msg->data[0] = (uint64_t) NULL;
else
msg->data[0] = (uint64_t) e->msg_q;
msg_respond(vfsMsgQ, msg);
}
break;
case VFS_MSG_EXEC:
{
printkd("VFS: Got exec request of %s\n",
(const char*)msg->data[0]);
VfsSystemModule* module =
vfs_find_module(VFS_MODULES,
(const char *) msg->data[0]);
void* fnptr = vfs_start_entrypoint(module);
// child == -ENOENT means module not found in base image
// so send a message to VFS_MSG queue to look in the
// extended image VFS_MSG queue will handle the
// msg_respond()
if( fnptr == reinterpret_cast<void*>(-ENOENT) )
// forward msg to usr vfs
{
VfsEntry::key_type k;
strcpy(k.key, VFS_ROOT_MSG_VFS);
VfsEntry* e = vfsContents.find(k);
if(e != NULL)
{
msg_t* emsg = msg_allocate();
emsg->type = msg->type;
emsg->data[0] = (uint64_t) msg;
emsg->data[1] = (uint64_t) vfsMsgQ;
msg_send(e->msg_q, emsg); // send async msg
}
else // Can't find VFS_MSG queue - not started yet
{
msg->data[0] = (uint64_t) fnptr;
msg_respond(vfsMsgQ, msg);
}
}
else // send back child (or errno)
{
msg->data[0] = (uint64_t) fnptr;
msg_respond(vfsMsgQ, msg);
}
}
break;
default:
msg_free(msg);
break;
}
} // end while(1)
return NULL;
}
// ----------------------------------------------------------------------------
void* vfs_start_entrypoint(VfsSystemModule * i_module)
{
void* ptr = reinterpret_cast<void*>(-ENOENT);
if(i_module != NULL)
{
if (i_module->start == NULL)
{
// module has no start() routine
ptr = reinterpret_cast<void*>(-ENOEXEC);
}
else
{
ptr = reinterpret_cast<void*>(i_module->start);
}
}
return ptr;
}
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