forked from nuttx/nuttx-update
b4cc9fb11b
reason: 1 To improve efficiency, we mimic Linux's behavior where preemption disabling is only applicable to the current CPU and does not affect other CPUs. 2 In the future, we will implement "spinlock+sched_lock", and use it extensively. Under such circumstances, if preemption is still globally disabled, it will seriously impact the scheduling efficiency. 3 We have removed g_cpu_lockset and used irqcount in order to eliminate the dependency of schedlock on critical sections in the future, simplify the logic, and further enhance the performance of sched_lock. 4 We set lockcount to 1 in order to lock scheduling on all CPUs during startup, without the need to provide additional functions to disable scheduling on other CPUs. 5 Cpu1~n must wait for cpu0 to enter the idle state before enabling scheduling because it prevents CPUs1~n from competing with cpu0 for the memory manager mutex, which could cause the cpu0 idle task to enter a wait state and trigger an assert. size nuttx before: text data bss dec hex filename 265396 51057 63646 380099 5ccc3 nuttx after: text data bss dec hex filename 265184 51057 63642 379883 5cbeb nuttx size -216 Configuring NuttX and compile: $ ./tools/configure.sh -l qemu-armv8a:nsh_smp $ make Running with qemu $ qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic \ -machine virt,virtualization=on,gic-version=3 \ -net none -chardev stdio,id=con,mux=on -serial chardev:con \ -mon chardev=con,mode=readline -kernel ./nuttx Signed-off-by: hujun5 <hujun5@xiaomi.com>
112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
/****************************************************************************
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* include/nuttx/init.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_INIT_H
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#define __INCLUDE_NUTTX_INIT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Macros for testing which OS services are available at this phase of
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* initialization.
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*/
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#define OSINIT_TASK_READY() (g_nx_initstate >= OSINIT_TASKLISTS)
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#define OSINIT_MM_READY() (g_nx_initstate >= OSINIT_MEMORY)
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#define OSINIT_HW_READY() (g_nx_initstate >= OSINIT_HARDWARE)
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#define OSINIT_OS_READY() (g_nx_initstate >= OSINIT_OSREADY)
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#define OSINIT_IDLELOOP() (g_nx_initstate >= OSINIT_IDLELOOP)
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#define OSINIT_OS_INITIALIZING() (g_nx_initstate < OSINIT_OSREADY)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Initialization state. OS bring-up occurs in several phases: */
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enum nx_initstate_e
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{
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OSINIT_POWERUP = 0, /* Power-up. No initialization yet performed.
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* Depends on .bss initialization logic for this
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* value. */
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OSINIT_BOOT = 1, /* Basic boot up initialization is complete. OS
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* services and hardware resources are not yet
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* available. */
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OSINIT_TASKLISTS = 2, /* Head of ready-to-run/assigned task lists valid */
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OSINIT_MEMORY = 3, /* The memory manager has been initialized */
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OSINIT_HARDWARE = 4, /* MCU-specific hardware is initialized. Hardware
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* resources such as timers and device drivers are
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* now available. Low-level OS services sufficient
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* to support the hardware are also available but
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* the OS has not yet completed its full
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* initialization. */
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OSINIT_OSREADY = 5, /* The OS is fully initialized and multi-tasking is
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* active. */
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OSINIT_IDLELOOP = 6, /* The OS enter idle loop. */
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OSINIT_PANIC = 7 /* Fatal error happened. */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/* This is the current initialization state. The level of initialization
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* is only important early in the start-up sequence when certain OS or
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* hardware resources may not yet be available to the OS-internal logic.
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*/
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EXTERN volatile uint8_t g_nx_initstate; /* See enum nx_initstate_e */
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Functions contained in nx_task.c *****************************************/
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/* OS entry point called by boot logic */
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void nx_start(void);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_INIT_H */
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