1c32b5d720
Allows the number of task priority levels supported by the micro- kernel to be configured, rather than fixing this value at 64. Setting NUM_TASK_PRIORITIES to N provides support for task priorities 0 (highest priority) through N-1 (lowest priority). The lowest priority is reserved for the kernel's idle task. This enhancement allows system designers to significantly reduce the size of the microkernel's task priority queues by eliminating unneeded queues. In systems requiring only a few task priorities over 500 bytes can be saved. Change-Id: I497aac608a3d548fb1b024068c08a5f494c3d524 Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* global.c */
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/*
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* Copyright (c) 1997-2010, 2012-2014 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "minik.h"
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#include "nanokernel.h"
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#include "nanok.h"
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#include "kticks.h" /* WL and timeslice stuff */
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#include <toolchain.h>
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#include <sections.h>
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#ifdef CONFIG_BOOT_TIME_MEASUREMENT
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#include <nanokernel/cpu.h>
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#endif
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extern void init_node(void); /* generated by SYSGEN */
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extern int _k_server_stack_size; /* generated by SYSGEN */
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extern char _k_server_stack[]; /* generated by SYSGEN */
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struct nano_stack __noinit _k_command_stack;
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#ifdef CONFIG_TASK_DEBUG
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int _k_debug_halt = 0;
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#endif
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#if CONFIG_COMMAND_STACK_SIZE <= 0
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#error COMMAND_STACK_SIZE must be greater than zero
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#endif
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uint32_t __noinit _k_server_command_stack_storage[CONFIG_COMMAND_STACK_SIZE];
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extern void K_swapper(int i1, int i2);
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void kernel_init(void)
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{
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#ifdef CONFIG_BOOT_TIME_MEASUREMENT
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/*
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* record timestamp for microkernel's main() function
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* (an approximation, as kernel_init() is the first thing done by
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* main())
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*/
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extern uint64_t __main_tsc;
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__main_tsc = _NanoTscRead();
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#endif
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/*
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* Note: most variables & data structure are globally initialized in
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* kernel_main.c
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*/
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init_node();
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#ifdef CONFIG_INIT_STACKS
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k_memset((char *)_k_server_command_stack_storage, 0xaa, sizeof(_k_server_command_stack_storage));
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#endif
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nano_stack_init(&_k_command_stack, _k_server_command_stack_storage);
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task_fiber_start((char *)_k_server_stack,
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_k_server_stack_size,
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K_swapper,
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0,
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0,
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CONFIG_MICROKERNEL_SERVER_PRIORITY,
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0);
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init_drivers();
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#ifdef CONFIG_WORKLOAD_MONITOR
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workload_monitor_calibrate();
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#endif
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}
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