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<h2>
<a name="1143614"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11 OS20</font>
</h2><hr>
<h3>
<a name="1147399"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11.1 Changes from R1.9 to R2.0</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1148453"> </a>C++ exception handling has been improved on ST20-C2 cores.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1148814"> </a>Support for the mutex type has been added.</font></p>
</ul>
<h3>
<a name="1143615"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11.2 Changes from R1.8.1 to R1.9</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143617"> </a>An interrupt level controller library <font size=2 face=Courier><strong>ilc2b.lib</strong></font> has been added to support the STV0396.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143618"> </a>Time logging is supported in a new prebuilt OS20 debug library. Access to task and interrupt time logging information is provided by the existing <font size=2 face=Courier><strong>interrupt_status</strong></font>, <font size=2 face=Courier><strong>interrupt_status_number</strong></font> and <font size=2 face=Courier><strong>task_status</strong></font> functions. System time logging information is provided by the new kernel functions <font size=2 face=Courier><strong>kernel_idle</strong></font> and <font size=2 face=Courier><strong>kernel_time</strong></font>. Time logging is described in the <em>Kernel</em> chapter of the <em>OS20 User Manual</em>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143622"> </a>Default mutual exclusion is provided for the C libraries. This is installed by <font size=2 face=Courier><strong>kernel_initialize()</strong></font>.</font></p>
</ul>
<h3>
<a name="1143623"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11.3 Changes from R1.8 to R1.8.1</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143625"> </a>Support in OS20 for new on-chip interrupt controller and interrupt level controller hardware provided on new chip designs. Details of how to link in the correct interrupt library are given in section 18.2 of the <em>ST20 Embedded Toolset User Manual</em>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143629"> </a>Several new OS20 functions are provided for cache control:</font></p>
<dl>
<dt> <a name="1143630"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>cache_config_data<br>cache_config_instruction<br>cache_disable_data<br>cache_disable_instruction<br>cache_enable_data<br>cache_enable_instruction<br>cache_flush_data<br>cache_init_controller<br>cache_invalidate_data<br>cache_invalidate_instruction<br>cache_lock<br>cache_status</strong></font></font>
</dl>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143631"> </a>A new function <font size=2 face=Courier><strong>partition_status</strong></font> returns the status of the heap, fixed and simple partitions. All partition functions return an error status if insufficient memory;</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143632"> </a>New functions <font size=2 face=Courier><strong>task_kill</strong></font>, <font size=2 face=Courier><strong>task_mortal</strong></font> and <font size=2 face=Courier><strong>task_immortal</strong></font> support the killing of a task;</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143633"> </a>New functions are provided to support the managing of stack space, namely <font size=2 face=Courier><strong>task_stack_fill</strong></font> and <font size=2 face=Courier><strong>task_stack_fill_set</strong></font>. The new function <font size=2 face=Courier><strong>task_status</strong></font> returns the status of a task, including stack details.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143634"> </a>The library filename <font size=2 face=Courier><strong>os20errno.lib</strong></font> has been added to the configuration file <font size=2 face=Courier><strong>os20libs.cfg</strong></font>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143635"> </a>A new function <font size=2 face=Courier><strong>task_resume_compatible</strong></font> has been added to provide behavior compatible with toolsets before release R1.7. See section <a href="port12.htm#1143131"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section燙.11: Task functions</i></font></a>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143639"> </a>A documented function <font size=2 face=Courier><strong>interrupt_status</strong></font> is provided in this release. This is not compatible with an undocumented version in toolsets earlier than R1.8.1, as an extra parameter has been added.</font></p>
</ul>
<h3>
<a name="1143640"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11.4 Changes from R1.7 to R1.8</font>
</h3>
<p>
<a name="1143641"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">None</font>
</p>
<h3>
<a name="1143642"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.11.5 Changes from R1.6.2 to R1.7</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143643"> </a>The following new functions have been added to the API:</font></p>
<dl>
<dt> <a name="1143644"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>chan_create<br>chan_create_address<br>chan_delete<br>chan_reset<br>memory_allocate_clear<br>partition_delete<br>task_context</strong></font></font>
</dl>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143645"> </a>For the API task and interrupt install functions, variations are now provided which take a function pointer as a parameter: </font></p>
<dl>
<dt> <a name="1143646"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>interrupt_install_sl<br>task_create_sl<br>task_init_sl<br>task_onexit_sl</strong></font></font>
<dt> <a name="1143647"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">These allows the static link to be specified as well, to support the use of RCUs with OS20.</font>
</dl>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143648"> </a>Callback is now supported by OS20. User-provided routines can be informed of scheduling operations, interrupt entry and exit, and task creation.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143649"> </a>Support on ST20-C2 cores for 2D block moves:</font></p>
<dl>
<dt> <a name="1143650"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>move2d_all<br>move2d_non_zero<br>move2d_zero</strong></font></font>
</dl>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143651"> </a>The amount of stack used by a task is increased by 2 words in the R1.7 release and later compared with R1.6.x. The algorithm for calculating stack usage given in the <em>ST20 Embedded Toolset User Manual</em> is unchanged, and is sufficiently generous to be enough for the new task usage.</font></p>
<dl>
<dt> <a name="1143655"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The amount of stack used by interrupts depends on the type of interrupt level controller the target device has. See the <em>Interrupts</em> chapter of the <em>OS20 User Manual</em> for more details of how to calculate stack size.</font>
</dl>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143659"> </a>If <font size=2 face=Courier><strong>task_reschedule</strong></font> occurs within a task lock, it now does not cause the task lock to be lost. This is a change in the behavior of <font size=2 face=Courier><strong>task_reschedule</strong></font> for release R1.7 and later, although the behavior in this circumstance was previously undocumented. </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143660"> </a>From release R1.7, the number of nested task suspensions (that is, calls to <font size=2 face=Courier><strong>task_suspend</strong></font>) is counted, so one <font size=2 face=Courier><strong>task_resume</strong></font> is needed to undo each <font size=2 face=Courier><strong>task_suspend</strong></font>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143661"> </a>The behavior of OS20 functions <font size=2 face=Courier><strong>task_suspend()</strong></font> and <font size=2 face=Courier><strong>task_resume()</strong></font> has changed between ST20 Toolset R1.6.2 and R1.7, as described in section <a href="port12.htm#1143131"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section燙.11: Task functions</i></font></a>.</font></p>
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