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incubator-nuttx/sched/init/nx_start.c

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/****************************************************************************
* sched/init/nx_start.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/board.h>
#include <nuttx/compiler.h>
#include <nuttx/sched.h>
#include <nuttx/fs/fs.h>
#include <nuttx/net/net.h>
#include <nuttx/mm/iob.h>
#include <nuttx/mm/kmap.h>
#include <nuttx/mm/mm.h>
#include <nuttx/kmalloc.h>
#include <nuttx/pgalloc.h>
#include <nuttx/sched_note.h>
#include <nuttx/trace.h>
#include <nuttx/binfmt/binfmt.h>
#include <nuttx/drivers/drivers.h>
#include <nuttx/init.h>
#include "sched/sched.h"
#include "signal/signal.h"
#include "semaphore/semaphore.h"
#include "mqueue/mqueue.h"
#include "mqueue/msg.h"
#include "clock/clock.h"
#include "timer/timer.h"
#include "irq/irq.h"
#include "group/group.h"
#include "init/init.h"
#include "tls/tls.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* This set of all CPUs */
#define SCHED_ALL_CPUS ((1 << CONFIG_SMP_NCPUS) - 1)
/****************************************************************************
* Public Data
****************************************************************************/
/* Task Lists ***************************************************************/
/* The state of a task is indicated both by the task_state field of the TCB
* and by a series of task lists. All of these tasks lists are declared
* below. Although it is not always necessary, most of these lists are
* prioritized so that common list handling logic can be used (only the
* g_readytorun, the g_pendingtasks, and the g_waitingforsemaphore lists
* need to be prioritized).
*/
/* This is the list of all tasks that are ready to run. This is a
* prioritized list with head of the list holding the highest priority
* (unassigned) task. In the non-SMP case, the head of this list is the
* currently active task and the tail of this list, the lowest priority
* task, is always the IDLE task.
*/
dq_queue_t g_readytorun;
/* In order to support SMP, the function of the g_readytorun list changes,
* The g_readytorun is still used but in the SMP case it will contain only:
*
* - Only tasks/threads that are eligible to run, but not currently running,
* and
* - Tasks/threads that have not been assigned to a CPU.
*
* Otherwise, the TCB will be retained in an assigned task list,
* g_assignedtasks. As its name suggests, on 'g_assignedtasks queue for CPU
* 'n' would contain only tasks/threads that are assigned to CPU 'n'. Tasks/
* threads would be assigned a particular CPU by one of two mechanisms:
*
* - (Semi-)permanently through an RTOS interfaces such as
* pthread_attr_setaffinity(), or
* - Temporarily through scheduling logic when a previously unassigned task
* is made to run.
*
* Tasks/threads that are assigned to a CPU via an interface like
* pthread_attr_setaffinity() would never go into the g_readytorun list, but
* would only go into the g_assignedtasks[n] list for the CPU 'n' to which
* the thread has been assigned. Hence, the g_readytorun list would hold
* only unassigned tasks/threads.
*
* Like the g_readytorun list in in non-SMP case, each g_assignedtask[] list
* is prioritized: The head of the list is the currently active task on this
* CPU. Tasks after the active task are ready-to-run and assigned to this
* CPU. The tail of this assigned task list, the lowest priority task, is
* always the CPU's IDLE task.
*/
#ifdef CONFIG_SMP
dq_queue_t g_assignedtasks[CONFIG_SMP_NCPUS];
#endif
/* g_running_tasks[] holds a references to the running task for each cpu.
* It is valid only when up_interrupt_context() returns true.
*/
FAR struct tcb_s *g_running_tasks[CONFIG_SMP_NCPUS];
/* This is the list of all tasks that are ready-to-run, but cannot be placed
* in the g_readytorun list because: (1) They are higher priority than the
* currently active task at the head of the g_readytorun list, and (2) the
* currently active task has disabled pre-emption.
*/
dq_queue_t g_pendingtasks;
/* This is the list of all tasks that are blocked waiting for a signal */
dq_queue_t g_waitingforsignal;
#ifdef CONFIG_PAGING
/* This is the list of all tasks that are blocking waiting for a page fill */
dq_queue_t g_waitingforfill;
#endif
#ifdef CONFIG_SIG_SIGSTOP_ACTION
/* This is the list of all tasks that have been stopped
* via SIGSTOP or SIGTSTP
*/
dq_queue_t g_stoppedtasks;
#endif
/* This list of all tasks that have been initialized, but not yet
* activated. NOTE: This is the only list that is not prioritized.
*/
dq_queue_t g_inactivetasks;
/* This is the value of the last process ID assigned to a task */
volatile pid_t g_lastpid;
/* The following hash table is used for two things:
*
* 1. This hash table greatly speeds the determination of a new unique
* process ID for a task, and
* 2. Is used to quickly map a process ID into a TCB.
*/
FAR struct tcb_s **g_pidhash;
volatile int g_npidhash;
/* This is a table of task lists. This table is indexed by the task state
* enumeration type (tstate_t) and provides a pointer to the associated
* static task list (if there is one) as well as a set of attribute flags
* indicating properties of the list, for example, if the list is an
* ordered list or not.
*/
const struct tasklist_s g_tasklisttable[NUM_TASK_STATES] =
{
{ /* TSTATE_TASK_INVALID */
NULL,
0
},
{ /* TSTATE_TASK_PENDING */
&g_pendingtasks,
TLIST_ATTR_PRIORITIZED
},
#ifdef CONFIG_SMP
{ /* TSTATE_TASK_READYTORUN */
&g_readytorun,
TLIST_ATTR_PRIORITIZED
},
{ /* TSTATE_TASK_ASSIGNED */
g_assignedtasks,
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_INDEXED | TLIST_ATTR_RUNNABLE
},
{ /* TSTATE_TASK_RUNNING */
g_assignedtasks,
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_INDEXED | TLIST_ATTR_RUNNABLE
},
#else
{ /* TSTATE_TASK_READYTORUN */
&g_readytorun,
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_RUNNABLE
},
{ /* TSTATE_TASK_RUNNING */
&g_readytorun,
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_RUNNABLE
},
#endif
{ /* TSTATE_TASK_INACTIVE */
&g_inactivetasks,
0
},
{ /* TSTATE_WAIT_SEM */
(FAR void *)offsetof(sem_t, waitlist),
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_OFFSET
},
{ /* TSTATE_WAIT_SIG */
&g_waitingforsignal,
0
}
#ifndef CONFIG_DISABLE_MQUEUE
,
{ /* TSTATE_WAIT_MQNOTEMPTY */
(FAR void *)offsetof(struct mqueue_inode_s, cmn.waitfornotempty),
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_OFFSET
},
{ /* TSTATE_WAIT_MQNOTFULL */
(FAR void *)offsetof(struct mqueue_inode_s, cmn.waitfornotfull),
TLIST_ATTR_PRIORITIZED | TLIST_ATTR_OFFSET
}
#endif
#ifdef CONFIG_PAGING
,
{ /* TSTATE_WAIT_PAGEFILL */
&g_waitingforfill,
TLIST_ATTR_PRIORITIZED
}
#endif
#ifdef CONFIG_SIG_SIGSTOP_ACTION
,
{ /* TSTATE_TASK_STOPPED */
&g_stoppedtasks,
0 /* See tcb->prev_state */
},
#endif
};
/* This is the current initialization state. The level of initialization
* is only important early in the start-up sequence when certain OS or
* hardware resources may not yet be available to the kernel logic.
*/
uint8_t g_nx_initstate; /* See enum nx_initstate_e */
/****************************************************************************
* Private Data
****************************************************************************/
/* This is an array of task control block (TCB) for the IDLE thread of each
* CPU. For the non-SMP case, this is a a single TCB; For the SMP case,
* there is one TCB per CPU. NOTE: The system boots on CPU0 into the IDLE
* task. The IDLE task later starts the other CPUs and spawns the user
* initialization task. That user initialization task is responsible for
* bringing up the rest of the system.
*/
static struct task_tcb_s g_idletcb[CONFIG_SMP_NCPUS];
/* This is the name of the idle task */
#if CONFIG_TASK_NAME_SIZE <= 0 || !defined(CONFIG_SMP)
# ifdef CONFIG_SMP
static const char g_idlename[] = "CPU_Idle";
# else
static const char g_idlename[] = "Idle_Task";
# endif
#endif
/* This is IDLE threads argument list. NOTE: Normally the argument
* list is created on the stack prior to starting the task. We have to
* do things little differently here for the IDLE tasks.
*/
static FAR char *g_idleargv[CONFIG_SMP_NCPUS][2];
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nx_start
*
* Description:
* This function is called to initialize the operating system and to spawn
* the user initialization thread of execution. This is the initial entry
* point into NuttX.
*
* Input Parameters:
* None
*
* Returned Value:
* Does not return.
*
****************************************************************************/
void nx_start(void)
{
int i;
sinfo("Entry\n");
/* Boot up is complete */
g_nx_initstate = OSINIT_BOOT;
/* Initialize RTOS Data ***************************************************/
sched_trace_begin();
/* Initialize the IDLE task TCB *******************************************/
for (i = 0; i < CONFIG_SMP_NCPUS; i++)
{
FAR dq_queue_t *tasklist;
/* Initialize a TCB for this thread of execution. NOTE: The default
* value for most components of the g_idletcb are zero. The entire
* structure is set to zero. Then only the (potentially) non-zero
* elements are initialized. NOTE: The idle task is the only task in
* that has pid == 0 and sched_priority == 0.
*/
memset((void *)&g_idletcb[i], 0, sizeof(struct task_tcb_s));
g_idletcb[i].cmn.pid = i;
g_idletcb[i].cmn.task_state = TSTATE_TASK_RUNNING;
/* Set the entry point. This is only for debug purposes. NOTE: that
* the start_t entry point is not saved. That is acceptable, however,
* because it can be used only for restarting a task: The IDLE task
* cannot be restarted.
*/
#ifdef CONFIG_SMP
if (i > 0)
{
g_idletcb[i].cmn.start = nx_idle_trampoline;
g_idletcb[i].cmn.entry.main = (main_t)nx_idle_trampoline;
}
else
#endif
{
g_idletcb[i].cmn.start = nx_start;
g_idletcb[i].cmn.entry.main = (main_t)nx_start;
}
/* Set the task flags to indicate that this is a kernel thread and, if
* configured for SMP, that this task is locked to this CPU.
*/
#ifdef CONFIG_SMP
g_idletcb[i].cmn.flags = (TCB_FLAG_TTYPE_KERNEL |
TCB_FLAG_NONCANCELABLE |
TCB_FLAG_CPU_LOCKED);
g_idletcb[i].cmn.cpu = i;
/* Set the affinity mask to allow the thread to run on all CPUs. No,
* this IDLE thread can only run on its assigned CPU. That is
* enforced by the TCB_FLAG_CPU_LOCKED which overrides the affinity
* mask. This is essential because all tasks inherit the affinity
* mask from their parent and, ultimately, the parent of all tasks is
* the IDLE task.
*/
g_idletcb[i].cmn.affinity =
(cpu_set_t)(CONFIG_SMP_DEFAULT_CPUSET & SCHED_ALL_CPUS);
#else
g_idletcb[i].cmn.flags = (TCB_FLAG_TTYPE_KERNEL |
TCB_FLAG_NONCANCELABLE);
#endif
#if CONFIG_TASK_NAME_SIZE > 0
/* Set the IDLE task name */
# ifdef CONFIG_SMP
snprintf(g_idletcb[i].cmn.name, CONFIG_TASK_NAME_SIZE, "CPU%d IDLE",
i);
# else
strlcpy(g_idletcb[i].cmn.name, g_idlename, CONFIG_TASK_NAME_SIZE);
# endif
/* Configure the task name in the argument list. The IDLE task does
* not really have an argument list, but this name is still useful
* for things like the NSH PS command.
*
* In the kernel mode build, the arguments are saved on the task's
* stack and there is no support that yet.
*/
g_idleargv[i][0] = g_idletcb[i].cmn.name;
#else
g_idleargv[i][0] = (FAR char *)g_idlename;
#endif /* CONFIG_TASK_NAME_SIZE */
/* Then add the idle task's TCB to the head of the current ready to
* run list.
*/
#ifdef CONFIG_SMP
tasklist = TLIST_HEAD(&g_idletcb[i].cmn, i);
#else
tasklist = TLIST_HEAD(&g_idletcb[i].cmn);
#endif
dq_addfirst((FAR dq_entry_t *)&g_idletcb[i], tasklist);
/* Mark the idle task as the running task */
g_running_tasks[i] = &g_idletcb[i].cmn;
}
/* Task lists are initialized */
g_nx_initstate = OSINIT_TASKLISTS;
/* Initialize RTOS facilities *********************************************/
/* Initialize the semaphore facility. This has to be done very early
* because many subsystems depend upon fully functional semaphores.
*/
nxsem_initialize();
#if defined(MM_KERNEL_USRHEAP_INIT) || defined(CONFIG_MM_KERNEL_HEAP) || \
defined(CONFIG_MM_PGALLOC)
/* Initialize the memory manager */
{
FAR void *heap_start;
size_t heap_size;
#ifdef MM_KERNEL_USRHEAP_INIT
/* Get the user-mode heap from the platform specific code and configure
* the user-mode memory allocator.
*/
up_allocate_heap(&heap_start, &heap_size);
kumm_initialize(heap_start, heap_size);
#endif
#ifdef CONFIG_MM_KERNEL_HEAP
/* Get the kernel-mode heap from the platform specific code and
* configure the kernel-mode memory allocator.
*/
up_allocate_kheap(&heap_start, &heap_size);
kmm_initialize(heap_start, heap_size);
#endif
#ifdef CONFIG_MM_PGALLOC
/* If there is a page allocator in the configuration, then get the page
* heap information from the platform-specific code and configure the
* page allocator.
*/
up_allocate_pgheap(&heap_start, &heap_size);
mm_pginitialize(heap_start, heap_size);
#endif
}
#endif
#ifdef CONFIG_MM_KMAP
/* Initialize the kernel dynamic mapping module */
kmm_map_initialize();
#endif
#ifdef CONFIG_ARCH_HAVE_EXTRA_HEAPS
/* Initialize any extra heap. */
up_extraheaps_init();
#endif
#ifdef CONFIG_MM_IOB
/* Initialize IO buffering */
iob_initialize();
#endif
/* Initialize the logic that determine unique process IDs. */
g_npidhash = 4;
while (g_npidhash <= CONFIG_SMP_NCPUS)
{
g_npidhash <<= 1;
}
g_pidhash = kmm_zalloc(sizeof(*g_pidhash) * g_npidhash);
DEBUGASSERT(g_pidhash);
/* IDLE Group Initialization **********************************************/
for (i = 0; i < CONFIG_SMP_NCPUS; i++)
{
int hashndx;
/* Assign the process ID(s) of ZERO to the idle task(s) */
hashndx = PIDHASH(i);
g_pidhash[hashndx] = &g_idletcb[i].cmn;
/* Allocate the IDLE group */
DEBUGVERIFY(group_allocate(&g_idletcb[i], g_idletcb[i].cmn.flags));
g_idletcb[i].cmn.group->tg_info->argv = &g_idleargv[i][0];
#ifdef CONFIG_SMP
/* Create a stack for all CPU IDLE threads (except CPU0 which already
* has a stack).
*/
if (i > 0)
{
DEBUGVERIFY(up_cpu_idlestack(i, &g_idletcb[i].cmn,
CONFIG_IDLETHREAD_STACKSIZE));
}
#endif
/* Initialize the processor-specific portion of the TCB */
up_initial_state(&g_idletcb[i].cmn);
/* Initialize the thread local storage */
tls_init_info(&g_idletcb[i].cmn);
/* Complete initialization of the IDLE group. Suppress retention
* of child status in the IDLE group.
*/
group_initialize(&g_idletcb[i]);
g_idletcb[i].cmn.group->tg_flags = GROUP_FLAG_NOCLDWAIT |
GROUP_FLAG_PRIVILEGED;
}
g_lastpid = CONFIG_SMP_NCPUS - 1;
/* The memory manager is available */
g_nx_initstate = OSINIT_MEMORY;
/* Initialize tasking data structures */
task_initialize();
/* Disables context switching because we need take the memory manager
* semaphore on this CPU so that it will not be available on the other
* CPUs until we have finished initialization.
*/
sched_lock();
/* Initialize the file system (needed to support device drivers) */
fs_initialize();
/* Initialize the interrupt handling subsystem (if included) */
irq_initialize();
/* Initialize the POSIX timer facility (if included in the link) */
clock_initialize();
#ifndef CONFIG_DISABLE_POSIX_TIMERS
timer_initialize();
#endif
/* Initialize the signal facility (if in link) */
nxsig_initialize();
#if !defined(CONFIG_DISABLE_MQUEUE) || !defined(CONFIG_DISABLE_MQUEUE_SYSV)
/* Initialize the named message queue facility (if in link) */
nxmq_initialize();
#endif
#ifndef CONFIG_DISABLE_MQUEUE_SYSV
/* Initialize the System V message queue facility (if in link) */
nxmsg_initialize();
#endif
#ifdef CONFIG_NET
/* Initialize the networking system */
net_initialize();
#endif
#ifndef CONFIG_BINFMT_DISABLE
/* Initialize the binfmt system */
binfmt_initialize();
#endif
/* Initialize Hardware Facilities *****************************************/
/* The processor specific details of running the operating system
* will be handled here. Such things as setting up interrupt
* service routines and starting the clock are some of the things
* that are different for each processor and hardware platform.
*/
up_initialize();
/* Initialize common drivers */
drivers_initialize();
#ifdef CONFIG_BOARD_EARLY_INITIALIZE
/* Call the board-specific up_initialize() extension to support
* early initialization of board-specific drivers and resources
* that cannot wait until board_late_initialize.
*/
board_early_initialize();
#endif
/* Hardware resources are now available */
g_nx_initstate = OSINIT_HARDWARE;
/* Setup for Multi-Tasking ************************************************/
/* Announce that the CPU0 IDLE task has started */
sched_note_start(&g_idletcb[0].cmn);
/* Initialize stdio for the IDLE task of each CPU */
for (i = 0; i < CONFIG_SMP_NCPUS; i++)
{
if (i > 0)
{
/* Clone stdout, stderr, stdin from the CPU0 IDLE task. */
DEBUGVERIFY(group_setuptaskfiles(&g_idletcb[i]));
}
else
{
/* Create stdout, stderr, stdin on the CPU0 IDLE task. These
* will be inherited by all of the threads created by the CPU0
* IDLE task.
*/
DEBUGVERIFY(group_setupidlefiles(&g_idletcb[i]));
}
}
#ifdef CONFIG_SMP
/* Start all CPUs *********************************************************/
/* A few basic sanity checks */
DEBUGASSERT(this_cpu() == 0);
/* Then start the other CPUs */
DEBUGVERIFY(nx_smp_start());
#endif /* CONFIG_SMP */
/* Bring Up the System ****************************************************/
/* The OS is fully initialized and we are beginning multi-tasking */
g_nx_initstate = OSINIT_OSREADY;
/* Create initial tasks and bring-up the system */
DEBUGVERIFY(nx_bringup());
/* Enter to idleloop */
g_nx_initstate = OSINIT_IDLELOOP;
/* Let other threads have access to the memory manager */
sched_trace_end();
sched_unlock();
/* The IDLE Loop **********************************************************/
/* When control is return to this point, the system is idle. */
sinfo("CPU0: Beginning Idle Loop\n");
#ifndef CONFIG_DISABLE_IDLE_LOOP
for (; ; )
{
/* Perform any processor-specific idle state operations */
up_idle();
}
#endif
}
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