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SIM: Add SMP idle thread setup logic -- forgot to add files before last commit.

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This commit is contained in:
Gregory Nutt 2016-02-11 12:17:41 -06:00
parent b087cb7f9a
commit ac6c9cf617
2 changed files with 358 additions and 0 deletions
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247
arch/sim/src/up_idlesetup.c Normal file
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/****************************************************************************
* arch/sim/src/up_idlesetup.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <queue.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include "group/group.h"
#include "sched/sched.h"
#include "up_internal.h"
/****************************************************************************
* Private Types
****************************************************************************/
struct sim_tcballoc_s
{
struct task_tcb_s tcb; /* IDLE task TCB */
char *idleargv[2]; /* Argument list */
};
/****************************************************************************
* Private Data
****************************************************************************/
#if CONFIG_TASK_NAME_SIZE < 1
static const char g_idlename[] = "Idle Task"
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sim_idletcb_setup
*
* Description:
* Initialize the IDLE task TCB for this CPU and add it to the
*
* Input Parameters:
* cpu - The CPU to undel
* idle - Memory allocated by sim_idletcb_setup
*
* Returned Value:
* Memory allocated by sim_idletcb_setup (for error recovery). NULL is
* returned only a a failure to allocate memory.
*
****************************************************************************/
static void *sim_idletcb_setup(int cpu, main_t idletask)
{
struct sim_tcballoc_s *alloc;
struct task_tcb_s *itcb;
dq_queue_t *tasklist;
/* IDLE TCB Initialization ************************************************/
/* Allocate and clear the IDLE TCB */
alloc = (struct sim_tcballoc_s *)kmm_zalloc(sizeof(struct sim_tcballoc_s));
if (alloc == NULL)
{
return NULL;
}
/* Initialize the TCB for the IDLE task on the stack */
itcb = &alloc->tcb;
itcb->cmn.task_state = TSTATE_TASK_RUNNING;
itcb->cmn.entry.main = idletask;
itcb->cmn.flags = (TCB_FLAG_TTYPE_KERNEL | TCB_FLAG_CPU_ASSIGNED);
itcb->cmn.cpu = cpu;
#if CONFIG_TASK_NAME_SIZE > 0
snprintf(itcb->cmn.name, CONFIG_TASK_NAME_SIZE, "CPU%d IDLE", cpu);
alloc->idleargv[0] = itcb->cmn.name;
#else
alloc->idleargv[0] = (FAR char *)g_idlename;
#endif
alloc->idleargv[1] = NULL;
itcb->argv = alloc->idleargv;
/* Add the IDLE task TCB to the end of the assigned task list */
tasklist = TLIST_HEAD(TSTATE_TASK_RUNNING, cpu);
dq_addfirst((FAR dq_entry_t *)itcb, tasklist);
/* Initialize the processor-specific portion of the TCB */
up_initial_state(&itcb->cmn);
/* PID assignment *********************************************************/
#if 0 /* REVISIT */
g_pidhash[PIDHASH(0)].tcb = &itcb->cmn;
#endif
/* IDLE Group Initialization **********************************************/
#ifdef HAVE_TASK_GROUP
/* Allocate the IDLE group */
DEBUGVERIFY(group_allocate(itcb, itcb->cmn.flags));
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
/* Create stdout, stderr, stdin on the IDLE task. These will be
* inherited by all of the threads created by the IDLE task.
*/
DEBUGVERIFY(group_setupidlefiles(itcb));
#endif
#ifdef HAVE_TASK_GROUP
/* Complete initialization of the IDLE group. Suppress retention
* of child status in the IDLE group.
*/
DEBUGVERIFY(group_initialize(itcb));
itcb->cmn.group->tg_flags = GROUP_FLAG_NOCLDWAIT;
#endif
return alloc;
}
/****************************************************************************
* Name: sim_idletcb_teardown
*
* Description:
* Undo what sim_idletcb_setup() did.
*
* Input Parameters:
* cpu - The CPU to undel
* alloc - Memory allocated by sim_idletcb_setup
*
* Returned Value:
* None
*
****************************************************************************/
static void sim_idletcb_teardown(int cpu, void *alloc)
{
/* Undo what sim_idletcb_setup() did */
dq_queue_t *tasklist= TLIST_HEAD(TSTATE_TASK_RUNNING, 0);
dq_init(tasklist);
kmm_free(alloc);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_cpustart
*
* Description:
* In an SMP configution, only one CPU is initially active (CPU 0). System
* initialization occurs on that single thread. At the completion of the
* initialization of the OS, just before beginning normal multitasking,
* the additional CPUs would be started by calling this function.
*
* Each CPU is provided the entry point to is IDLE task when started. The
* OS initialization logic calls this function repeatedly until each CPU
* has been started.
*
* Input Parameters:
* cpu - The index of the CPU being started. This will be a numeric
* value in the range of from one to (CONFIG_SMP_NCPUS-1). (CPU
* 0 is already active)
* idletask - The entry point to the IDLE task.
*
* Returned Value:
* Zero on success; a negated errno value on failure.
*
****************************************************************************/
int up_cpustart(int cpu, main_t idletask)
{
void *alloc;
int ret;
/* Set up the IDLE thread TCB */
alloc = sim_idletcb_setup(cpu, idletask);
if (alloc == NULL)
{
return -ENOMEM;
}
/* Start the CPU emulation thread. This is analogous to starting the CPU
* in a multi-CPU hardware model.
*/
ret = sim_cpustart(cpu, idletask);
if (ret < 0)
{
/* Undo what sim_idletcb_setup() did */
sim_idletcb_teardown(cpu, alloc);
}
return ret;
}

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arch/sim/src/up_testset.c Normal file
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/****************************************************************************
* arch/sim/src/up_testset.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
#include <pthread.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Must match definitions in arch/sim/include/spinlock.h */
#define SP_UNLOCKED 0 /* The Un-locked state */
#define SP_LOCKED 1 /* The Locked state */
/****************************************************************************
* Public Types
****************************************************************************/
/* Must match definitions in arch/sim/include/spinlock.h */
typedef uint8_t spinlock_t;
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_SMP
static pthread_mutex_t g_tsmutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_testset
*
* Description:
* Perform and atomic test and set operation on the provided spinlock.
*
* This function must be provided via the architecture-specific logoic.
*
* Input Parameters:
* lock - The address of spinlock object.
*
* Returned Value:
* The spinlock is always locked upon return. The value of previous value
* of the spinlock variable is returned, either SP_LOCKED if the spinlock
* as previously locked (meaning that the test-and-set operation failed to
* obtain the lock) or SP_UNLOCKED if the spinlock was previously unlocked
* (meaning that we successfully obtained the lock)
*
****************************************************************************/
spinlock_t up_testset(volatile spinlock_t *lock)
{
#ifdef CONFIG_SMP
/* In the multi-CPU SMP case, we use a mutex to assure that the following
* test and set is atomic.
*/
(void)pthread_mutex_lock(&g_tsmutex);
#endif
/* In the non-SMP case, the simulation is implemented with a single thread
* the test-and-set operation is inherently atomic.
*/
spinlock_t ret = *lock;
*lock = SP_LOCKED;
#ifdef CONFIG_SMP
(void)pthread_mutex_unlock(&g_tsmutex);
#endif
return ret;
}