Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-29 23:03:33 +08:00 · 2012-09-17 18:18:44 +00:00
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+/************************************************************************
+ * up_initialize.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 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 (_TCB*)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_SUPPRESS_INTERRUPTS
+  up_timerinit();
+#endif
+
+  up_ledon(LED_IRQSENABLED);
+}
+