Add more context switching files

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3624 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 130 insertions, 0 deletions

diff --git a/nuttx/arch/mips/src/mips32/up_initialstate.c b/nuttx/arch/mips/src/mips32/up_initialstate.c
new file mode 100644
index 000000000..8236aaff7
--- /dev/null
+++ b/nuttx/arch/mips/src/mips32/up_initialstate.c
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * arch/arm/src/cortexm3/up_initialstate.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <nuttx/arch.h>
+#include <arch/irq.h>
+#include <arch/mips32/cp0.h>
+
+#include "up_internal.h"
+#include "up_arch.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_initial_state
+ *
+ * Description:
+ *   A new thread is being started and a new TCB
+ *   has been created. This function is called to initialize
+ *   the processor specific portions of the new TCB.
+ *
+ *   This function must setup the intial architecture registers
+ *   and/or  stack so that execution will begin at tcb->start
+ *   on the next context switch.
+ *
+ ****************************************************************************/
+
+void up_initial_state(_TCB *tcb)
+{
+  struct xcptcontext *xcp = &tcb->xcp;
+  irqstate_t status;
+
+  /* Initialize the initial exception register context structure */
+
+  memset(xcp, 0, sizeof(struct xcptcontext));
+
+  /* Save the initial stack pointer */
+
+  xcp->regs[REG_SP]      = (uint32_t)tcb->adj_stack_ptr;
+
+  /* Save the task entry point */
+
+  xcp->regs[REG_EPC]     = (uint32_t)tcb->start;
+  
+  /* If this task is running PIC, then set the PIC base register to the
+   * address of the allocated D-Space region.
+   */
+
+#ifdef CONFIG_PIC
+#  warning "Missing logic"
+#endif
+
+  /* Set privileged- or unprivileged-mode, depending on how NuttX is
+   * configured and what kind of thread is being started.
+   *
+   * If the kernel build is not selected, then all threads run in
+   * privileged thread mode.
+   */
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  warning "Missing logic"
+#endif
+
+  /* Enable or disable interrupts, based on user configuration */
+
+  status = cp0_getstatus();
+# ifdef CONFIG_SUPPRESS_INTERRUPTS
+  status   &= ~CP0_STATUS_IM_MASK;  /* Disable all interrupts */
+  status   |= CP0_STATUS_IM_SWINTS; /* Make sure that S/W interrupts enabled */
+#else
+  status   |= CP0_STATUS_IM_ALL;    /* Enable all interrupts */
+# endif
+  xcp->regs[REG_STATUS] = status;
+}
+