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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>MyOS Kernel: kernel/cpu/i386/paging.c File Reference</title>
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<div class="header">
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<a href="#func-members">Functions</a> &#124;
<a href="#var-members">Variables</a> </div>
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<div class="title">paging.c File Reference</div> </div>
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<div class="textblock"><code>#include &quot;<a class="el" href="pmem_8h_source.html">../../pmem.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="vga__err_8h_source.html">../../vga_err.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="halt_8h_source.html">../halt.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="paging_8h_source.html">../paging.h</a>&quot;</code><br />
<code>#include &quot;arch_consts.h&quot;</code><br />
<code>#include &lt;stdint.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a7fb8d280bc19b061f91b82733932c94f"><td class="memItemLeft" align="right" valign="top">static char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a7fb8d280bc19b061f91b82733932c94f">is_page_present</a> (size_t page)</td></tr>
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<tr class="memitem:a2370886c08cc1b84fa1d81fc8022db9b"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a2370886c08cc1b84fa1d81fc8022db9b">map_pages</a> (void *virt_addr_ptr, void *phys_addr_ptr, int num_pages, char usr, char wr)</td></tr>
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<tr class="memitem:a1675ea0f8e4994b4fbbbe3984ca522b1"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a1675ea0f8e4994b4fbbbe3984ca522b1">find_free_pages</a> (int num_pages)</td></tr>
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<tr class="memitem:a64db1d6c4d8861128d9e6e7f671213d8"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a64db1d6c4d8861128d9e6e7f671213d8">alloc_pages</a> (int num_pages)</td></tr>
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<tr class="memitem:a65a7667a1f8f74a06df63ece822c70d2"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a65a7667a1f8f74a06df63ece822c70d2">virt_to_phys</a> (void *virt_addr_arg)</td></tr>
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<tr class="memitem:a0f831aadf41672c296645a7b0df4a5c6"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a0f831aadf41672c296645a7b0df4a5c6">alloc_pages_virt</a> (int num_pages, void *addr)</td></tr>
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<tr class="memitem:abaa0040e698c54cc890b55894bbff094"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#abaa0040e698c54cc890b55894bbff094">invl_page</a> (void *addr)</td></tr>
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<tr class="memitem:a8b1cb213f5783b7137f40279db762ffc"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a8b1cb213f5783b7137f40279db762ffc">paging_new_address_space</a> ()</td></tr>
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<tr class="memitem:a8c15ffa3d18088ca41f78d5c632f6b02"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a8c15ffa3d18088ca41f78d5c632f6b02">unmap_pages</a> (void *start_virt, int num_pages)</td></tr>
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<tr class="memitem:a569adfd13ea3c63741f64108821b1712"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a569adfd13ea3c63741f64108821b1712">paging_init</a> ()</td></tr>
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Variables</h2></td></tr>
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static uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#af7ba1ea666217e6ce8c16b16217b4ed4">page_directory</a> [1024]</td></tr>
<tr class="memdesc:af7ba1ea666217e6ce8c16b16217b4ed4"><td class="mdescLeft">&#160;</td><td class="mdescRight">The kernel process's page directory. <br /></td></tr>
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static uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a178fdbc06e3c09fc67a90becd7b04cf3">kern_page_tables</a> [NUM_KERN_FRAMES]</td></tr>
<tr class="memdesc:a178fdbc06e3c09fc67a90becd7b04cf3"><td class="mdescLeft">&#160;</td><td class="mdescRight">The page tables where the kernel binary is mapped in. <br /></td></tr>
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static uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a6914db49a71a383cd9ec79f2c2fcf2f0">kstack_page_tables</a> [218 *1024]</td></tr>
<tr class="memdesc:a6914db49a71a383cd9ec79f2c2fcf2f0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Page tables for thread kernel stacks. <br /></td></tr>
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static uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#ab3316ce221e6b85c0af74aeacd4daf87">kmalloc_page_tables</a> [4 *1024]</td></tr>
<tr class="memdesc:ab3316ce221e6b85c0af74aeacd4daf87"><td class="mdescLeft">&#160;</td><td class="mdescRight">Page tables for the kmalloc heap. <br /></td></tr>
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static uint32_t *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#a3d02d59abc01ecbc4abe432d0280f712">pagdirmap</a> =(uint32_t*)0xFFFFF000</td></tr>
<tr class="memdesc:a3d02d59abc01ecbc4abe432d0280f712"><td class="mdescLeft">&#160;</td><td class="mdescRight">Pointer to the page directory entries in the recursive mapping. <br /></td></tr>
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<tr class="memitem:aad931785935264e2f614bb96a96e92f5"><td class="memItemLeft" align="right" valign="top"><a id="aad931785935264e2f614bb96a96e92f5"></a>
static uint32_t *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="paging_8c.html#aad931785935264e2f614bb96a96e92f5">page_table_map</a> =(uint32_t*)0xFFC00000</td></tr>
<tr class="memdesc:aad931785935264e2f614bb96a96e92f5"><td class="mdescLeft">&#160;</td><td class="mdescRight">Pointer to the page table entries in the recursive mapping. <br /></td></tr>
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</table>
<h2 class="groupheader">Function Documentation</h2>
<a id="a64db1d6c4d8861128d9e6e7f671213d8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a64db1d6c4d8861128d9e6e7f671213d8">&#9670;&nbsp;</a></span>alloc_pages()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void* alloc_pages </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_pages</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Allocate virtual pages &amp; map them to physical memory. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">num_pages</td><td>The number of pages to allocate. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>a pointer to the allocated pages. </dd></dl>
</div>
</div>
<a id="a0f831aadf41672c296645a7b0df4a5c6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0f831aadf41672c296645a7b0df4a5c6">&#9670;&nbsp;</a></span>alloc_pages_virt()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void alloc_pages_virt </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_pages</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>addr</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Allocate virtual pages at a specific address &amp; map them to physical memory. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">num_pages</td><td>The number of pages to allocate. </td></tr>
<tr><td class="paramname">addr</td><td>The adress to start allocation at. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a1675ea0f8e4994b4fbbbe3984ca522b1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1675ea0f8e4994b4fbbbe3984ca522b1">&#9670;&nbsp;</a></span>find_free_pages()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void* find_free_pages </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_pages</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Finds free virtual pages and returns the start address </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">num_pages</td><td>The minimum size of the free area </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the start of the free area </dd></dl>
</div>
</div>
<a id="a9d97f4dc5220371b494591ba21484503"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9d97f4dc5220371b494591ba21484503">&#9670;&nbsp;</a></span>get_cr3()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void* get_cr3 </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get the current address space </p><dl class="section return"><dt>Returns</dt><dd>a pointer to the current address space in physical memory. </dd></dl>
</div>
</div>
<a id="abaa0040e698c54cc890b55894bbff094"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abaa0040e698c54cc890b55894bbff094">&#9670;&nbsp;</a></span>invl_page()</h2>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">static void invl_page </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>addr</em></td><td>)</td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Invalidates a page in the TLB, </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">addr</td><td>The address of the page to invalidate. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a7fb8d280bc19b061f91b82733932c94f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a7fb8d280bc19b061f91b82733932c94f">&#9670;&nbsp;</a></span>is_page_present()</h2>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">static char is_page_present </td>
<td>(</td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>page</em></td><td>)</td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Checks whether a page is present </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">page</td><td>The page number to check </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Whether the page is present </dd></dl>
</div>
</div>
<a id="a4c7ec6ba518ea622a2cf804633708383"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4c7ec6ba518ea622a2cf804633708383">&#9670;&nbsp;</a></span>load_address_space()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void load_address_space </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>cr3</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Load an address space </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">cr3</td><td>The address space to load </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a2370886c08cc1b84fa1d81fc8022db9b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2370886c08cc1b84fa1d81fc8022db9b">&#9670;&nbsp;</a></span>map_pages()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void map_pages </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>virt_addr_ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>phys_addr_ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_pages</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char&#160;</td>
<td class="paramname"><em>usr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char&#160;</td>
<td class="paramname"><em>wr</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>Map virtual pages to physical frames. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">virt_addr_ptr</td><td>The start of the virtual range to map. </td></tr>
<tr><td class="paramname">phys_addr_ptr</td><td>The start of the physical range to map. </td></tr>
<tr><td class="paramname">num_pages</td><td>The number of pages to map. </td></tr>
<tr><td class="paramname">usr</td><td>Are the pages acessible by user mode code </td></tr>
<tr><td class="paramname">wr</td><td>Are the pages writable by user mode code (kernel always has write permissions) </td></tr>
</table>
</dd>
</dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a569adfd13ea3c63741f64108821b1712">&#9670;&nbsp;</a></span>paging_init()</h2>
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<td class="memname">void paging_init </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<p>Initialize paging </p>
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</div>
<a id="a8b1cb213f5783b7137f40279db762ffc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8b1cb213f5783b7137f40279db762ffc">&#9670;&nbsp;</a></span>paging_new_address_space()</h2>
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<td class="memname">void* paging_new_address_space </td>
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<td class="paramname"></td><td>)</td>
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<p>Create a new address space </p><dl class="section return"><dt>Returns</dt><dd>a pointer to the new address space in physical memory. </dd></dl>
</div>
</div>
<a id="a8c15ffa3d18088ca41f78d5c632f6b02"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8c15ffa3d18088ca41f78d5c632f6b02">&#9670;&nbsp;</a></span>unmap_pages()</h2>
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<td class="memname">void unmap_pages </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>start_virt</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_pages</em>&#160;</td>
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<p>Unmap virtual pages, </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">start_virt</td><td>The start of the virtual range to unmap. </td></tr>
<tr><td class="paramname">num_pages</td><td>The number of pages to map. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a65a7667a1f8f74a06df63ece822c70d2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a65a7667a1f8f74a06df63ece822c70d2">&#9670;&nbsp;</a></span>virt_to_phys()</h2>
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<td class="memname">void* virt_to_phys </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>virt_addr</em></td><td>)</td>
<td></td>
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<p>Convert a virtual address to a physical one. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">virt_addr</td><td>The virtual address to convert </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the physical adress it maps to, or NULL if it is not mapped. </dd></dl>
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