Add kernel mode hooks and reminders for other architectures

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3484 42af7a65-404d-4744-a932-0658087f49c3

arch/avr/src/avr32/up_initialstate.c

@@ -108,6 +108,17 @@ void up_initial_state(_TCB *tcb)
 
   xcp->regs[REG_PC]      = (uint32_t)tcb->start;
 
+  /* Set supervisor- or user-mode, depending on how NuttX is configured and
+   * what kind of thread is being started.  Disable FIQs in any event
+   *
+   * If the kernel build is not selected, then all threads run in
+   * supervisor-mode.
+   */
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  error "Missing logic for the CONFIG_NUTTX_KERNEL build"
+#endif
+
   /* Enable or disable interrupts, based on user configuration */
 
 # ifdef CONFIG_SUPPRESS_INTERRUPTS

arch/sh/src/sh1/sh1_initialstate.c

@@ -99,8 +99,28 @@ void up_initial_state(_TCB *tcb)
   /* Initialize the initial exception register context structure */
 
   memset(xcp, 0, sizeof(struct xcptcontext));
+
+  /* Set the initial stack pointer to the "base" of the allocated stack */
+
   xcp->regs[REG_SP] = (uint32_t)tcb->adj_stack_ptr;
+
+  /* Save the task entry point */
+
   xcp->regs[REG_PC] = (uint32_t)tcb->start;
+
+  /* Set supervisor- or user-mode, depending on how NuttX is configured and
+   * what kind of thread is being started.  Disable FIQs in any event
+   *
+   * If the kernel build is not selected, then all threads run in
+   * supervisor-mode.
+   */
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  error "Missing logic for the CONFIG_NUTTX_KERNEL build"
+#endif
+
+  /* Enable or disable interrupts, based on user configuration */
+
 #ifdef CONFIG_SUPPRESS_INTERRUPTS
   xcp->regs[REG_SR] = up_getsr() | 0x000000f0;
 #else

arch/x86/src/i486/up_initialstate.c

@@ -104,6 +104,17 @@ void up_initial_state(_TCB *tcb)
   xcp->regs[REG_CS]      = up_getcs();
   xcp->regs[REG_SS]      = up_getss();
 
+  /* Set supervisor- or user-mode, depending on how NuttX is configured and
+   * what kind of thread is being started.  Disable FIQs in any event
+   *
+   * If the kernel build is not selected, then all threads run in
+   * supervisor-mode.
+   */
+
+#ifdef CONFIG_NUTTX_KERNEL
+#  error "Missing logic for the CONFIG_NUTTX_KERNEL build"
+#endif
+
   /* Enable or disable interrupts, based on user configuration.  If the IF
    * bit is set, maskable interrupts will be enabled.
    */