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<section id="memory-map">
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<h1>Memory Map<a class="headerlink" href="#memory-map" title="Permalink to this heading"></a></h1>
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<section id="temporary-memory-layout">
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<h2>Temporary Memory Layout<a class="headerlink" href="#temporary-memory-layout" title="Permalink to this heading"></a></h2>
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<p>SBL Stage 1 temporary memory layout:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> <span class="n">Temporary</span> <span class="n">Memory</span>
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<span class="o">+------------------------------+</span> <span class="n">Top</span> <span class="n">of</span> <span class="mi">4</span><span class="n">GB</span>
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<span class="o">|</span> <span class="n">Memory</span> <span class="n">Mapped</span> <span class="n">Flash</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">Memory</span><span class="o">-</span><span class="n">Mapped</span> <span class="n">Flash</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">FSP</span><span class="o">-</span><span class="n">T</span> <span class="n">Reserved</span> <span class="n">Data</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">Top</span> <span class="n">of</span> <span class="n">Usable</span> <span class="n">Temporary</span> <span class="n">Memory</span>
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<span class="o">|</span> <span class="n">Available</span><span class="o">*</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">End</span> <span class="n">of</span> <span class="n">Stage</span> <span class="mi">1</span> <span class="n">Data</span>
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<span class="o">|</span> <span class="n">Stage</span> <span class="mi">1</span> <span class="n">Data</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">Stage</span> <span class="mi">1</span> <span class="n">Stack</span> <span class="n">Top</span><span class="o">/</span><span class="n">Stage</span> <span class="mi">1</span> <span class="n">Data</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">Stage</span> <span class="mi">1</span> <span class="n">Stack</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">Usable</span> <span class="n">CAR</span> <span class="n">Base</span><span class="o">/</span><span class="n">Stage</span> <span class="mi">1</span> <span class="n">Stack</span> <span class="n">Base</span>
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</pre></div>
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</div>
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<aside class="footnote-list brackets">
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<aside class="footnote brackets" id="id1" role="note">
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<span class="label"><span class="fn-bracket">[</span>*<span class="fn-bracket">]</span></span>
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<p>FSP-M Stack Region is typically chosen from Available Temporary Memory.</p>
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</aside>
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</aside>
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</section>
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<section id="memory-management">
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<h2>Memory Management<a class="headerlink" href="#memory-management" title="Permalink to this heading"></a></h2>
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<ul class="simple">
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<li><p>Once main memory has been initialized, Stage 1B migrates the Slim Bootloader stack from temporary memory to the permanent
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memory and also reserves a portion of memory to be used for global data structures (<code class="docutils literal notranslate"><span class="pre">LdrGlobal</span></code>, GDT, IDT), stack, heap,
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and payload.</p></li>
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</ul>
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</section>
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<section id="permanent-memory-map">
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<h2>Permanent Memory Map<a class="headerlink" href="#permanent-memory-map" title="Permalink to this heading"></a></h2>
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<p>SBL internal memory map layout (<code class="docutils literal notranslate"><span class="pre">BootloaderCoreLib.h</span></code>):</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> <span class="n">Reserved</span> <span class="n">MEM</span>
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<span class="o">+------------------------------+</span> <span class="n">Top</span> <span class="n">of</span> <span class="n">Low</span> <span class="n">MEM</span>
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<span class="o">|</span> <span class="n">SOC</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">Top</span> <span class="n">of</span> <span class="n">usable</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">FSP</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">FSP</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">LDR</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">LDR</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">ACPI</span> <span class="n">NVS</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">ACPI</span> <span class="n">NVS</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">ACPI</span> <span class="n">Reclaim</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">ACPI</span> <span class="n">Reclaim</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="o">|</span> <span class="n">PLD</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">PLD</span> <span class="n">Reserved</span> <span class="n">MEM</span> <span class="n">Base</span>
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<span class="n">Loader</span> <span class="n">Reserved</span> <span class="n">MEM</span>
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<span class="o">+------------------------------+</span> <span class="n">StackTop</span>
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<span class="o">|</span> <span class="n">LDR</span> <span class="n">Stack</span> <span class="p">(</span><span class="n">Down</span><span class="p">)</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="n">LDR</span> <span class="n">HOB</span> <span class="p">(</span><span class="n">Up</span><span class="p">)</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">MemPoolEnd</span> <span class="p">(</span><span class="n">Fixed</span><span class="p">)</span>
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<span class="o">|</span> <span class="n">Global</span> <span class="n">Data</span> <span class="n">structures</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="n">Permanent</span> <span class="n">MEM</span> <span class="n">Pool</span> <span class="p">(</span><span class="n">Down</span><span class="p">)</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span> <span class="n">v</span>
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<span class="o">+------------------------------+</span> <span class="n">MemPoolCurrTop</span> <span class="p">(</span><span class="n">Moving</span> <span class="n">down</span><span class="p">)</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">MemPoolCurrBottom</span> <span class="p">(</span><span class="n">Moving</span> <span class="n">up</span><span class="p">)</span>
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<span class="o">|</span> <span class="o">|</span> <span class="o">^</span>
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<span class="o">|</span> <span class="n">Temporary</span> <span class="n">MEM</span> <span class="n">Pool</span> <span class="p">(</span><span class="n">Up</span><span class="p">)</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">+------------------------------+</span> <span class="n">MemPoolStart</span> <span class="p">(</span><span class="n">Fixed</span><span class="p">)</span>
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</pre></div>
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</div>
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||
</section>
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<section id="memory-allocation-within-slim-bootloader">
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<h2>Memory Allocation within Slim Bootloader<a class="headerlink" href="#memory-allocation-within-slim-bootloader" title="Permalink to this heading"></a></h2>
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<p>Slim Bootloader has two different libraries for allocating memory during various
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execution phases of the bootloader.</p>
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<ul class="simple">
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<li><p>Stage 1A, Stage 1B, Stage 2 use <code class="docutils literal notranslate"><span class="pre">MemoryAllocationLib</span></code> present in <code class="docutils literal notranslate"><span class="pre">BootloaderCorePkg</span></code>.</p></li>
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<li><p>OsLoader and FwUpdate use <code class="docutils literal notranslate"><span class="pre">FullMemoryAllocationLib</span></code> present in <code class="docutils literal notranslate"><span class="pre">BootloaderCommonPkg</span></code>.</p></li>
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</ul>
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<section id="memoryallocationlib">
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<h3><code class="docutils literal notranslate"><span class="pre">MemoryAllocationLib</span></code><a class="headerlink" href="#memoryallocationlib" title="Permalink to this heading"></a></h3>
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<p><code class="docutils literal notranslate"><span class="pre">MemoryAllocationLib</span></code> allocates memory from the Loader Reserved Memory region. This
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can be seen diagrammatically in the “Loader Reserved MEM” layout shown above.</p>
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||
<p><code class="docutils literal notranslate"><span class="pre">MemoryAllocationLib</span></code> provides services for allocating two different types of memory -</p>
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<ul class="simple">
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<li><p>Bootloader permanent memory:</p>
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<ul>
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<li><p>Bootloader permanent memory is used by the bootloader to store device tables, S3 Data,
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SBL container headers, etc.</p></li>
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<li><p>Memory allocated from bootloader permanent memory region cannot be freed</p></li>
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<li><p>Note that permanent memory does not mean that it is persistent across reboots</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">AllocatePool()</span></code>, <code class="docutils literal notranslate"><span class="pre">AllocateZeroPool()</span></code>, <code class="docutils literal notranslate"><span class="pre">AllocatePages()</span></code>, <code class="docutils literal notranslate"><span class="pre">AllocateAlignedPages()</span></code>
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allocate memory from the Loader Reserved region starting from <code class="docutils literal notranslate"><span class="pre">MemPoolEnd</span></code> which grows
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down towards <code class="docutils literal notranslate"><span class="pre">MemPoolStart</span></code></p>
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<ul>
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<li><p>Currently used allocated memory is between <code class="docutils literal notranslate"><span class="pre">MemPoolEnd</span></code> and <code class="docutils literal notranslate"><span class="pre">MemPoolCurrTop</span></code></p></li>
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<li><p>Loader Reserved Memory is reported to the OS as “Reserved” memory</p></li>
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</ul>
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</li>
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</ul>
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</li>
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<li><p>Temporary Memory:</p>
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<ul>
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<li><p>Temporary memory requested by a stage is expected to be used by that stage itself</p></li>
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<li><p>Temporary memory is allocated starting from <code class="docutils literal notranslate"><span class="pre">MemPoolStart</span></code> and grows up towards
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<code class="docutils literal notranslate"><span class="pre">MemPoolEnd</span></code>.</p>
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<ul>
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<li><p>Currently used temporary memory is between <code class="docutils literal notranslate"><span class="pre">MemPoolStart</span></code> and <code class="docutils literal notranslate"><span class="pre">MemPoolEnd</span></code></p></li>
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</ul>
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</li>
|
||
<li><p>Temporary Memory is freed by the <code class="docutils literal notranslate"><span class="pre">FreeTemporaryMemory()</span></code> API call.</p>
|
||
<ul>
|
||
<li><p>Calling <code class="docutils literal notranslate"><span class="pre">FreeTemporaryMemory()</span></code> with <code class="docutils literal notranslate"><span class="pre">NULL</span></code> as a parameter will free all allocated
|
||
memory within the temporary memory region.</p></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="fullmemoryallocationlib">
|
||
<h3><code class="docutils literal notranslate"><span class="pre">FullMemoryAllocationLib</span></code><a class="headerlink" href="#fullmemoryallocationlib" title="Permalink to this heading"></a></h3>
|
||
<ul class="simple">
|
||
<li><p>Stage 2 passes the HOB list pointer, and the Payload executable base to the payload.</p></li>
|
||
<li><p>The HOB list pointer contains the pointer to the HOBs consumed by the payload. The <code class="docutils literal notranslate"><span class="pre">MEMORY_MAP_INFO</span></code> HOB will report memory available to the payload.</p>
|
||
<ul>
|
||
<li><p>The payload reserved memory region from memory map info hob is identified by the <code class="docutils literal notranslate"><span class="pre">MEM_MAP_TYPE_RESERVED</span></code> entry type and the <code class="docutils literal notranslate"><span class="pre">MEM_MAP_FLAG_PAYLOAD</span></code>
|
||
flag.</p></li>
|
||
</ul>
|
||
</li>
|
||
<li><p>In case of tightly-coupled payloads, once the payload is loaded, <code class="docutils literal notranslate"><span class="pre">PayloadInit()</span></code> is called by <code class="docutils literal notranslate"><span class="pre">PayloadEntryLib</span></code> to initialize global data for the
|
||
payload.</p></li>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">PayloadInit()</span></code> in turn calls <code class="docutils literal notranslate"><span class="pre">AddMemoryResourceRange()</span></code> from <code class="docutils literal notranslate"><span class="pre">FullMemoryAllocationLib</span></code> to initialize the memory ranges from which memory
|
||
will be allocated to the payload.</p></li>
|
||
<li><p>The size of the reserved memory, heap, and stack is determined by their respective PCDs defined in <code class="docutils literal notranslate"><span class="pre">BoardConfig.py</span></code>.</p>
|
||
<ul>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">PLD_RSVD_MEM_SIZE</span></code>, <code class="docutils literal notranslate"><span class="pre">PLD_HEAP_SIZE</span></code>, and <code class="docutils literal notranslate"><span class="pre">PLD_STACK_SIZE</span></code></p></li>
|
||
</ul>
|
||
</li>
|
||
<li><p>Once the memory ranges are initialized, dynamic memory allocation will be done from the payload heap region.</p></li>
|
||
<li><p>The memory map of the Payload can be seen below:</p></li>
|
||
</ul>
|
||
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span> Payload Memmap
|
||
+--------------------------------------------+ TOLUM
|
||
| Reserved memory for Slimboot core |
|
||
+--------------------------------------------+ RsvdBase + RsvdSize
|
||
| Reserved memory for Payload |
|
||
+--------------------------------------------+ RsvdBase
|
||
| + DMA buffer |
|
||
+--------------------------------------------+ DmaBase
|
||
| + Payload heap |
|
||
+--------------------------------------------+ HeapBase
|
||
| + Payload stack |
|
||
+--------------------------------------------+ StackBase
|
||
| Free memory |
|
||
+--------------------------------------------+ 0
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
</section>
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