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<div class="title">getfreepage.c</div> </div>
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<a href="../../d9/dfc/getfreepage_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2002-2018 The UbixOS Project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This was developed by Christopher W. Olsen for the UbixOS Project.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification, are permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * provided that the following conditions are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * 1) Redistributions of source code must retain the above copyright notice, this list of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * conditions, the following disclaimer and the list of authors.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * 2) Redistributions in binary form must reproduce the above copyright notice, this list of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * conditions, the following disclaimer and the list of authors in the documentation and/or</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * other materials provided with the distribution.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * endorse or promote products derived from this software without specific prior written</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * permission.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="../../d1/d21/vmm_8h.html">vmm/vmm.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="../../d3/d24/kpanic_8h.html">ubixos/kpanic.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="../../df/d63/spinlock_8h.html">ubixos/spinlock.h</a>></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="../../d1/daf/structspinLock.html">spinLock</a> vmmGFPlock = <a class="code" href="../../df/d63/spinlock_8h.html#a0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">/************************************************************************</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> Function: void *vmm_getFreePage(pidType pid);</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> Description: Returns A Free Page Mapped To The VM Space</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"></span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> Notes:</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"></span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> 07/30/02 - This Returns A Free Page In The Top 1GB For The Kernel</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"></span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="../../d9/dfc/getfreepage_8c.html#ad6eff5040ec0334e0003ad532300da0c"> 45</a></span> <span class="comment"> ************************************************************************/</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="keywordtype">void</span> *<a class="code" href="../../d9/dfc/getfreepage_8c.html#ad6eff5040ec0334e0003ad532300da0c">vmm_getFreePage</a>(<a class="code" href="../../d0/d27/include_2sys_2types_8h.html#ae438ba74394b14d7b24b6df3b3b8c252">pidType</a> pid) {</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <a class="code" href="../../dd/d1e/objgfx30_8h.html#a81f3b46fa4ddd984830104840a08da82">uInt16</a> x = 0x0, y = 0x0;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <a class="code" href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a> *pageTableSrc = 0x0;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <a class="code" href="../../dc/d88/armv6_2spinlock_8c.html#a71f03d2ba55111c715b6068254847a53">spinLock</a>(&vmmGFPlock);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">/* Lets Search For A Free Page */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span> (x = <a class="code" href="../../d4/df4/paging_8h.html#ac96f9536624cb5d2e7634f37fa919c4c">PD_INDEX</a>(<a class="code" href="../../d1/d21/vmm_8h.html#ad6394b4f60e68fe4e1431fc4e1998957">VMM_KERN_START</a>); x <= <a class="code" href="../../d4/df4/paging_8h.html#ac96f9536624cb5d2e7634f37fa919c4c">PD_INDEX</a>(<a class="code" href="../../d1/d21/vmm_8h.html#a8204faafc0c27e418f993e07c2f59f14">VMM_KERN_END</a>); x++) {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">/* Set Page Table Address */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  pageTableSrc = (<a class="code" href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a> *) (<a class="code" href="../../d4/df4/paging_8h.html#a8d42a9a09d9dea53cab3044f51482acc">PT_BASE_ADDR</a> + (0x1000 * x));</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">for</span> (y = 0x0; y < 1024; y++) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">/* Loop Through The Page Table Find An UnAllocated Page */</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a>) pageTableSrc[y] == (<a class="code" href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a>) 0x0) {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">/* Map A Physical Page To The Virtual Page */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../d4/df4/paging_8h.html#adea68f248df43bddee62a09d945304b0">vmm_remapPage</a>(<a class="code" href="../../d1/d21/vmm_8h.html#ab8e4e189a7b1df2a03072ce5b75c89fe">vmm_findFreePage</a>(pid), ((x * 0x400000) + (y * 0x1000)), <a class="code" href="../../d4/df4/paging_8h.html#a8b838cda4f0bc79ab8d07eb19dd35420">KERNEL_PAGE_DEFAULT</a>, pid, 0)) == 0x0)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="../../dc/d94/armv6_2kpanic_8c.html#adb9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"vmmRemapPage: vmm_getFreePage\n"</span>);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">/* Clear This Page So No Garbage Is There */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <a class="code" href="../../de/d38/paging_8c.html#a8350aa43ff69829ba667ca34d9bcaa7a">vmm_clearVirtualPage</a>((<a class="code" href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a>) ((x * 0x400000) + (y * 0x1000)));</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">/* Return The Address Of The Newly Allocate Page */</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="../../dc/d88/armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247">spinUnlock</a>(&vmmGFPlock);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">return</span> ((<span class="keywordtype">void</span> *) ((x * 0x400000) + (y * 0x1000)));</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  }</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">/* If No Free Page Was Found Return NULL */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <a class="code" href="../../dc/d88/armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247">spinUnlock</a>(&vmmGFPlock);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">return</span> (0x0);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> }</div>
</div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="aspinlock_8h_html"><div class="ttname"><a href="../../df/d63/spinlock_8h.html">spinlock.h</a></div></div>
<div class="ttc" id="aobjgfx30_8h_html_ada085051a6d9a8e00a2cb256d1af14ba"><div class="ttname"><a href="../../dd/d1e/objgfx30_8h.html#ada085051a6d9a8e00a2cb256d1af14ba">uInt32</a></div><div class="ttdeci">unsigned long int uInt32</div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d1e/objgfx30_8h_source.html#l00049">objgfx30.h:49</a></div></div>
<div class="ttc" id="aobjgfx30_8h_html_a81f3b46fa4ddd984830104840a08da82"><div class="ttname"><a href="../../dd/d1e/objgfx30_8h.html#a81f3b46fa4ddd984830104840a08da82">uInt16</a></div><div class="ttdeci">unsigned short int uInt16</div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d1e/objgfx30_8h_source.html#l00048">objgfx30.h:48</a></div></div>
<div class="ttc" id="agetfreepage_8c_html_ad6eff5040ec0334e0003ad532300da0c"><div class="ttname"><a href="../../d9/dfc/getfreepage_8c.html#ad6eff5040ec0334e0003ad532300da0c">vmm_getFreePage</a></div><div class="ttdeci">void * vmm_getFreePage(pidType pid)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/dfc/getfreepage_8c_source.html#l00045">getfreepage.c:45</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_ae29ab191c93f9ead066cb462dd2e7247"><div class="ttname"><a href="../../dc/d88/armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247">spinUnlock</a></div><div class="ttdeci">void spinUnlock(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d88/armv6_2spinlock_8c_source.html#l00036">spinlock.c:36</a></div></div>
<div class="ttc" id="avmm_8h_html"><div class="ttname"><a href="../../d1/d21/vmm_8h.html">vmm.h</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a0fe85a4f3642683148b25916d6c5eafd"><div class="ttname"><a href="../../df/d63/spinlock_8h.html#a0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a></div><div class="ttdeci">#define SPIN_LOCK_INITIALIZER</div><div class="ttdef"><b>Definition:</b> <a href="../../df/d63/spinlock_8h_source.html#l00036">spinlock.h:36</a></div></div>
<div class="ttc" id="aarmv6_2kpanic_8c_html_adb9a182aa071791a306163d50d653deb"><div class="ttname"><a href="../../dc/d94/armv6_2kpanic_8c.html#adb9a182aa071791a306163d50d653deb">kpanic</a></div><div class="ttdeci">void kpanic(const char *fmt,...)</div><div class="ttdoc">print panic message and halt system</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d94/armv6_2kpanic_8c_source.html#l00041">kpanic.c:41</a></div></div>
<div class="ttc" id="avmm_8h_html_ad6394b4f60e68fe4e1431fc4e1998957"><div class="ttname"><a href="../../d1/d21/vmm_8h.html#ad6394b4f60e68fe4e1431fc4e1998957">VMM_KERN_START</a></div><div class="ttdeci">#define VMM_KERN_START</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d21/vmm_8h_source.html#l00064">vmm.h:64</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_a71f03d2ba55111c715b6068254847a53"><div class="ttname"><a href="../../dc/d88/armv6_2spinlock_8c.html#a71f03d2ba55111c715b6068254847a53">spinLock</a></div><div class="ttdeci">void spinLock(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d88/armv6_2spinlock_8c_source.html#l00055">spinlock.c:55</a></div></div>
<div class="ttc" id="akpanic_8h_html"><div class="ttname"><a href="../../d3/d24/kpanic_8h.html">kpanic.h</a></div></div>
<div class="ttc" id="avmm_8h_html_ab8e4e189a7b1df2a03072ce5b75c89fe"><div class="ttname"><a href="../../d1/d21/vmm_8h.html#ab8e4e189a7b1df2a03072ce5b75c89fe">vmm_findFreePage</a></div><div class="ttdeci">uint32_t vmm_findFreePage(pidType pid)</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/db5/vmm__memory_8c_source.html#l00221">vmm_memory.c:221</a></div></div>
<div class="ttc" id="apaging_8h_html_ac96f9536624cb5d2e7634f37fa919c4c"><div class="ttname"><a href="../../d4/df4/paging_8h.html#ac96f9536624cb5d2e7634f37fa919c4c">PD_INDEX</a></div><div class="ttdeci">#define PD_INDEX(v_addr)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df4/paging_8h_source.html#l00040">paging.h:40</a></div></div>
<div class="ttc" id="apaging_8h_html_adea68f248df43bddee62a09d945304b0"><div class="ttname"><a href="../../d4/df4/paging_8h.html#adea68f248df43bddee62a09d945304b0">vmm_remapPage</a></div><div class="ttdeci">int vmm_remapPage(uint32_t, uint32_t, uint16_t, pidType, int haveLock)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d38/paging_8c_source.html#l00199">paging.c:199</a></div></div>
<div class="ttc" id="apaging_8c_html_a8350aa43ff69829ba667ca34d9bcaa7a"><div class="ttname"><a href="../../de/d38/paging_8c.html#a8350aa43ff69829ba667ca34d9bcaa7a">vmm_clearVirtualPage</a></div><div class="ttdeci">int vmm_clearVirtualPage(uint32_t pageAddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d38/paging_8c_source.html#l00356">paging.c:356</a></div></div>
<div class="ttc" id="ainclude_2sys_2types_8h_html_ae438ba74394b14d7b24b6df3b3b8c252"><div class="ttname"><a href="../../d0/d27/include_2sys_2types_8h.html#ae438ba74394b14d7b24b6df3b3b8c252">pidType</a></div><div class="ttdeci">int pidType</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d27/include_2sys_2types_8h_source.html#l00075">types.h:75</a></div></div>
<div class="ttc" id="astructspinLock_html"><div class="ttname"><a href="../../d1/daf/structspinLock.html">spinLock</a></div><div class="ttdef"><b>Definition:</b> <a href="../../df/d63/spinlock_8h_source.html#l00041">spinlock.h:41</a></div></div>
<div class="ttc" id="apaging_8h_html_a8b838cda4f0bc79ab8d07eb19dd35420"><div class="ttname"><a href="../../d4/df4/paging_8h.html#a8b838cda4f0bc79ab8d07eb19dd35420">KERNEL_PAGE_DEFAULT</a></div><div class="ttdeci">#define KERNEL_PAGE_DEFAULT</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df4/paging_8h_source.html#l00069">paging.h:69</a></div></div>
<div class="ttc" id="avmm_8h_html_a8204faafc0c27e418f993e07c2f59f14"><div class="ttname"><a href="../../d1/d21/vmm_8h.html#a8204faafc0c27e418f993e07c2f59f14">VMM_KERN_END</a></div><div class="ttdeci">#define VMM_KERN_END</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d21/vmm_8h_source.html#l00065">vmm.h:65</a></div></div>
<div class="ttc" id="apaging_8h_html_a8d42a9a09d9dea53cab3044f51482acc"><div class="ttname"><a href="../../d4/df4/paging_8h.html#a8d42a9a09d9dea53cab3044f51482acc">PT_BASE_ADDR</a></div><div class="ttdeci">#define PT_BASE_ADDR</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df4/paging_8h_source.html#l00046">paging.h:46</a></div></div>
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