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| author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-04-07 14:39:55 +0000 |
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| committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-04-07 14:39:55 +0000 |
| commit | b7527ff1800f938dcadc65ece0abbbe4a69821eb (patch) | |
| tree | 13a84dfd1b2725250e41f9b7fec0d61bc3671e10 /nuttx/Documentation/NuttxPortingGuide.html | |
| parent | 0a143e4c2dfae5e5b9e1000fd83ce5d05a84d6aa (diff) | |
| download | nuttx-b7527ff1800f938dcadc65ece0abbbe4a69821eb.tar.gz nuttx-b7527ff1800f938dcadc65ece0abbbe4a69821eb.tar.bz2 nuttx-b7527ff1800f938dcadc65ece0abbbe4a69821eb.zip | |
Add support for kernel-mode threads
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3478 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/Documentation/NuttxPortingGuide.html')
| -rw-r--r-- | nuttx/Documentation/NuttxPortingGuide.html | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/nuttx/Documentation/NuttxPortingGuide.html b/nuttx/Documentation/NuttxPortingGuide.html index 5efc76e6c..b55dc6fd9 100644 --- a/nuttx/Documentation/NuttxPortingGuide.html +++ b/nuttx/Documentation/NuttxPortingGuide.html @@ -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> |