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Add support for kernel-mode threads

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3478 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-04-07 14:39:55 +00:00
parent 75465bba4c
commit 6ba4b1414a
1 changed files with 16 additions and 7 deletions
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23
Documentation/NuttxPortingGuide.html
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@ -12,7 +12,7 @@
<h1><big><font color="#3c34ec">
<i>NuttX RTOS Porting Guide</i>
</font></big></h1>
<p>Last Updated: April 6, 2011</p>
<p>Last Updated: April 7, 2011</p>
</td>
</tr>
</table>
@ -1217,14 +1217,23 @@ The system can be re-made subsequently by just typing <code>make</code>.
<p><b>Prototype</b>: <code>void up_initial_state(FAR _TCB *tcb);</code></p>
<p><b>Description</b>.
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.
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.
</p>
<p>
This function must setup the initial architecture registers
and/or stack so that execution will begin at tcb->start
on the next context switch.
This function must setup the initial architecture registers and/or stack so that execution
will begin at tcb->start on the next context switch.
</p>
<p>
This function may also need to set up processor registers so that the new thread executes
with the correct privileges.
If <code>CONFIG_NUTTX_KERNEL</code> has been selected in the NuttX configuration,
then special initialization may need to be performed depending on the task type specified
in the TCB's flags field:
Kernel threads will require kernel-mode privileges;
User tasks and pthreads should have only user-mode privileges.
If <code>CONFIG_NUTTX_KERNEL</code> has <i>not</i> been selected,
then all threads should have kernel-mode privileges.
</p>
<h3><a name="upcreatestack">4.1.4 <code>up_create_stack()</code></a></h3>