/************************************************************************
* arch/8051/src/up_initialize.c
*
* Copyright (C) 2007, 2009, 2011, 2014 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 <stdint.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include "up_internal.h"
/************************************************************************
* Private Definitions
************************************************************************/
/************************************************************************
* Private Data
************************************************************************/
/* This is the top of the stack containing the interrupt
* stack frame. It is set when processing an interrupt. It
* is also cleared when the interrupt returns so this can
* also be used like a boolean indication that we are in an
* interrupt.
*/
volatile uint8_t g_irqtos;
/* Registers are saved in the following global array during
* interrupt processing. If a context switch is performed
* during the interrupt handling, these registers will be
* copied into the TCB again (NOTE: We could save a copy
* if the interrupt handling logic saved the registers
* directly into (struct tcb_s*)g_readytorun.head->xcp.regs).
*/
uint8_t g_irqregs[REGS_SIZE];
/* If during execution of an interrup handler, a context
* switch must be performed, the follwing will be set to
* to that address of the relevant context structure. The
* actual switch will be deferred until the time that the
* the interrupt exits.
*/
FAR struct xcptcontext *g_irqcontext;
/* It is faster to look up 8-bit shifts in this table than
* to comput them.
*/
const uint8_t g_ntobit[8] =
{ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
/************************************************************************
* Private Functions
************************************************************************/
/************************************************************************
* Public Functions
************************************************************************/
/************************************************************************
* Name: up_initialize
*
* Description:
* up_initialize will be called once during OS
* initialization after the basic OS services have been
* initialized. The architecture specific details of
* initializing the OS will be handled here. Such things as
* setting up interrupt service routines, starting the
* clock, and registering device drivers are some of the
* things that are different for each processor and hardware
* platform.
*
* up_initialize is called after the OS initialized but
* before the init process has been started and before the
* libraries have been initialized. OS services and driver
* services are available.
*
************************************************************************/
void up_initialize(void)
{
/* Initialize global variables */
g_irqtos = 0;
/* Add extra memory fragments to the memory manager */
#if CONFIG_MM_REGIONS > 1
up_addregion();
#endif
/* Initialize the interrupt subsystem */
up_irqinitialize();
/* Initialize the system timer interrupt */
#ifndef CONFIG_ARCH_8051_SUPRESS_INTERRUPTS
up_timer_initialize();
#endif
board_led_on(LED_IRQSENABLED);
}
