145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
/************************************************************************
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* up_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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************************************************************************/
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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 <stdint.h>
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#include <nuttx/arch.h>
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#include <nuttx/fs/fs.h>
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#include "up_internal.h"
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/************************************************************************
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* Private Definitions
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************************************************************************/
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/************************************************************************
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* Private Data
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************************************************************************/
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/* This is the top of the stack containing the interrupt
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* stack frame. It is set when processing an interrupt. It
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* is also cleared when the interrupt returns so this can
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* also be used like a boolean indication that we are in an
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* interrupt.
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*/
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volatile uint8_t g_irqtos;
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/* Registers are saved in the following global array during
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* interrupt processing. If a context switch is performed
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* during the interrupt handling, these registers will be
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* copied into the TCB again (NOTE: We could save a copy
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* if the interrupt handling logic saved the registers
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* directly into (_TCB*)g_readytorun.head->xcp.regs).
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*/
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uint8_t g_irqregs[REGS_SIZE];
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/* If during execution of an interrup handler, a context
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* switch must be performed, the follwing will be set to
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* to that address of the relevant context structure. The
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* actual switch will be deferred until the time that the
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* the interrupt exits.
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*/
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FAR struct xcptcontext *g_irqcontext;
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/* It is faster to look up 8-bit shifts in this table than
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* to comput them.
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*/
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const uint8_t g_ntobit[8] =
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{ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Name: up_initialize
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*
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* Description:
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* up_initialize will be called once during OS
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* initialization after the basic OS services have been
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* initialized. The architecture specific details of
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* initializing the OS will be handled here. Such things as
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* setting up interrupt service routines, starting the
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* clock, and registering device drivers are some of the
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* things that are different for each processor and hardware
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* platform.
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*
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* up_initialize is called after the OS initialized but
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* before the init process has been started and before the
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* libraries have been initialized. OS services and driver
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* services are available.
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*
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************************************************************************/
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void up_initialize(void)
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{
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/* Initialize global variables */
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g_irqtos = 0;
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/* Add extra memory fragments to the memory manager */
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#if CONFIG_MM_REGIONS > 1
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up_addregion();
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#endif
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/* Initialize the interrupt subsystem */
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up_irqinitialize();
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/* Initialize the system timer interrupt */
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#ifndef CONFIG_SUPPRESS_INTERRUPTS
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up_timerinit();
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#endif
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up_ledon(LED_IRQSENABLED);
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}
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