Integrate syscall with existing svcall logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3472 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 94 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/cortexm3/svcall.h b/nuttx/arch/arm/src/cortexm3/svcall.h
new file mode 100644
index 000000000..bca3e0799
--- /dev/null
+++ b/nuttx/arch/arm/src/cortexm3/svcall.h
@@ -0,0 +1,94 @@
+/************************************************************************************
+ * arch/arm/src/cortexm3/svcall.h
+ *
+ *   Copyright (C) 2011 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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_COMMON_CORTEXM_SVCALL_H
+#define __ARCH_ARM_SRC_COMMON_CORTEXM_SVCALL_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  include <syscall.h>
+#endif
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Configuration ********************************************************************/
+/* This logic uses three system calls {0,1,2} for context switching.  The first three
+ * syscall values must be reserved.
+ */
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  ifndef CONFIG_SYS_RESERVED
+#    error "CONFIG_SYS_RESERVED must be defined to the value 3"
+#  elif CONFIG_SYS_RESERVED != 3
+#    error "CONFIG_SYS_RESERVED must have the value 3"
+#  endif
+#endif
+
+/* Cortex M3 system calls ***********************************************************/
+
+/* SYS call 0:
+ *
+ * int up_saveusercontext(uint32_t *saveregs);
+ */
+
+#define SYS_save_context    (0)
+
+/* SYS call 1:
+ *
+ * void up_fullcontextrestore(uint32_t *restoreregs) __attribute__ ((noreturn));
+ */
+
+#define SYS_restore_context (1)
+
+/* SYS call 1:
+ *
+ * void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
+ */
+
+#define SYS_switch_context  (2)
+
+/************************************************************************************
+ * Inline Functions
+ ************************************************************************************/
+
+#endif  /* __ARCH_ARM_SRC_COMMON_CORTEXM_SVCALL_H */
+