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</pre><pre class="rust"><code><span class="doccomment">//! batch subsystem</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::sync::UPSafeCell</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::trap::TrapContext</span>;
<span class="kw">use</span> <span class="ident">core::arch::asm</span>;
<span class="kw">use</span> <span class="ident">lazy_static</span>::<span class="kw-2">*</span>;
<span class="kw">const</span> <span class="ident">USER_STACK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">4096</span> <span class="op">*</span> <span class="number">2</span>;
<span class="kw">const</span> <span class="ident">KERNEL_STACK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">4096</span> <span class="op">*</span> <span class="number">2</span>;
<span class="kw">const</span> <span class="ident">MAX_APP_NUM</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">16</span>;
<span class="kw">const</span> <span class="ident">APP_BASE_ADDRESS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0x80400000</span>;
<span class="kw">const</span> <span class="ident">APP_SIZE_LIMIT</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0x20000</span>;
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">align</span>(<span class="number">4096</span>))]</span>
<span class="kw">struct</span> <span class="ident">KernelStack</span> {
<span class="ident">data</span>: [<span class="ident">u8</span>; <span class="ident">KERNEL_STACK_SIZE</span>],
}
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">align</span>(<span class="number">4096</span>))]</span>
<span class="kw">struct</span> <span class="ident">UserStack</span> {
<span class="ident">data</span>: [<span class="ident">u8</span>; <span class="ident">USER_STACK_SIZE</span>],
}
<span class="kw">static</span> <span class="ident">KERNEL_STACK</span>: <span class="ident">KernelStack</span> <span class="op">=</span> <span class="ident">KernelStack</span> {
<span class="ident">data</span>: [<span class="number">0</span>; <span class="ident">KERNEL_STACK_SIZE</span>],
};
<span class="kw">static</span> <span class="ident">USER_STACK</span>: <span class="ident">UserStack</span> <span class="op">=</span> <span class="ident">UserStack</span> {
<span class="ident">data</span>: [<span class="number">0</span>; <span class="ident">USER_STACK_SIZE</span>],
};
<span class="kw">impl</span> <span class="ident">KernelStack</span> {
<span class="kw">fn</span> <span class="ident">get_sp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">KERNEL_STACK_SIZE</span>
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push_context</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">cx</span>: <span class="ident">TrapContext</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="kw-2">mut</span> <span class="ident">TrapContext</span> {
<span class="kw">let</span> <span class="ident">cx_ptr</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">get_sp</span>() <span class="op">-</span> <span class="ident">core::mem::size_of</span>::<span class="op">&lt;</span><span class="ident">TrapContext</span><span class="op">&gt;</span>()) <span class="kw">as</span> <span class="kw-2">*mut</span> <span class="ident">TrapContext</span>;
<span class="kw">unsafe</span> {
<span class="kw-2">*</span><span class="ident">cx_ptr</span> <span class="op">=</span> <span class="ident">cx</span>;
}
<span class="kw">unsafe</span> { <span class="ident">cx_ptr</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>() }
}
}
<span class="kw">impl</span> <span class="ident">UserStack</span> {
<span class="kw">fn</span> <span class="ident">get_sp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">USER_STACK_SIZE</span>
}
}
<span class="kw">struct</span> <span class="ident">AppManager</span> {
<span class="ident">num_app</span>: <span class="ident">usize</span>,
<span class="ident">current_app</span>: <span class="ident">usize</span>,
<span class="ident">app_start</span>: [<span class="ident">usize</span>; <span class="ident">MAX_APP_NUM</span> <span class="op">+</span> <span class="number">1</span>],
}
<span class="kw">impl</span> <span class="ident">AppManager</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">print_app_info</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
<span class="macro">println!</span>(<span class="string">&quot;[kernel] num_app = {}&quot;</span>, <span class="self">self</span>.<span class="ident">num_app</span>);
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">num_app</span> {
<span class="macro">println!</span>(
<span class="string">&quot;[kernel] app_{} [{:#x}, {:#x})&quot;</span>,
<span class="ident">i</span>,
<span class="self">self</span>.<span class="ident">app_start</span>[<span class="ident">i</span>],
<span class="self">self</span>.<span class="ident">app_start</span>[<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>]
);
}
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">load_app</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">app_id</span>: <span class="ident">usize</span>) {
<span class="kw">if</span> <span class="ident">app_id</span> <span class="op">&gt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">num_app</span> {
<span class="macro">println!</span>(<span class="string">&quot;All applications completed!&quot;</span>);
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;board_qemu&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::board::QEMUExit</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;board_qemu&quot;</span>)]</span>
<span class="ident"><span class="kw">crate</span>::board::QEMU_EXIT_HANDLE</span>.<span class="ident">exit_success</span>();
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;board_k210&quot;</span>)]</span>
<span class="macro">panic!</span>(<span class="string">&quot;All applications completed!&quot;</span>);
}
<span class="macro">println!</span>(<span class="string">&quot;[kernel] Loading app_{}&quot;</span>, <span class="ident">app_id</span>);
<span class="comment">// clear icache</span>
<span class="macro">asm!</span>(<span class="string">&quot;fence.i&quot;</span>);
<span class="comment">// clear app area</span>
<span class="ident">core::slice::from_raw_parts_mut</span>(<span class="ident">APP_BASE_ADDRESS</span> <span class="kw">as</span> <span class="kw-2">*mut</span> <span class="ident">u8</span>, <span class="ident">APP_SIZE_LIMIT</span>).<span class="ident">fill</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">app_src</span> <span class="op">=</span> <span class="ident">core::slice::from_raw_parts</span>(
<span class="self">self</span>.<span class="ident">app_start</span>[<span class="ident">app_id</span>] <span class="kw">as</span> <span class="kw-2">*const</span> <span class="ident">u8</span>,
<span class="self">self</span>.<span class="ident">app_start</span>[<span class="ident">app_id</span> <span class="op">+</span> <span class="number">1</span>] <span class="op">-</span> <span class="self">self</span>.<span class="ident">app_start</span>[<span class="ident">app_id</span>],
);
<span class="kw">let</span> <span class="ident">app_dst</span> <span class="op">=</span> <span class="ident">core::slice::from_raw_parts_mut</span>(<span class="ident">APP_BASE_ADDRESS</span> <span class="kw">as</span> <span class="kw-2">*mut</span> <span class="ident">u8</span>, <span class="ident">app_src</span>.<span class="ident">len</span>());
<span class="ident">app_dst</span>.<span class="ident">copy_from_slice</span>(<span class="ident">app_src</span>);
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_current_app</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">current_app</span>
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">move_to_next_app</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">current_app</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
}
<span class="macro">lazy_static!</span> {
<span class="kw">static</span> <span class="kw-2">ref</span> <span class="ident">APP_MANAGER</span>: <span class="ident">UPSafeCell</span><span class="op">&lt;</span><span class="ident">AppManager</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">UPSafeCell::new</span>({
<span class="kw">extern</span> <span class="string">&quot;C&quot;</span> {
<span class="kw">fn</span> <span class="ident">_num_app</span>();
}
<span class="kw">let</span> <span class="ident">num_app_ptr</span> <span class="op">=</span> <span class="ident">_num_app</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="kw">as</span> <span class="kw-2">*const</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">num_app</span> <span class="op">=</span> <span class="ident">num_app_ptr</span>.<span class="ident">read_volatile</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">app_start</span>: [<span class="ident">usize</span>; <span class="ident">MAX_APP_NUM</span> <span class="op">+</span> <span class="number">1</span>] <span class="op">=</span> [<span class="number">0</span>; <span class="ident">MAX_APP_NUM</span> <span class="op">+</span> <span class="number">1</span>];
<span class="kw">let</span> <span class="ident">app_start_raw</span>: <span class="kw-2">&amp;</span>[<span class="ident">usize</span>] <span class="op">=</span>
<span class="ident">core::slice::from_raw_parts</span>(<span class="ident">num_app_ptr</span>.<span class="ident">add</span>(<span class="number">1</span>), <span class="ident">num_app</span> <span class="op">+</span> <span class="number">1</span>);
<span class="ident">app_start</span>[..<span class="op">=</span><span class="ident">num_app</span>].<span class="ident">copy_from_slice</span>(<span class="ident">app_start_raw</span>);
<span class="ident">AppManager</span> {
<span class="ident">num_app</span>,
<span class="ident">current_app</span>: <span class="number">0</span>,
<span class="ident">app_start</span>,
}
})
};
}
<span class="doccomment">/// init batch subsystem</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() {
<span class="ident">print_app_info</span>();
}
<span class="doccomment">/// print apps info</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">print_app_info</span>() {
<span class="ident">APP_MANAGER</span>.<span class="ident">exclusive_access</span>().<span class="ident">print_app_info</span>();
}
<span class="doccomment">/// run next app</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run_next_app</span>() -&gt; <span class="op">!</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">app_manager</span> <span class="op">=</span> <span class="ident">APP_MANAGER</span>.<span class="ident">exclusive_access</span>();
<span class="kw">let</span> <span class="ident">current_app</span> <span class="op">=</span> <span class="ident">app_manager</span>.<span class="ident">get_current_app</span>();
<span class="kw">unsafe</span> {
<span class="ident">app_manager</span>.<span class="ident">load_app</span>(<span class="ident">current_app</span>);
}
<span class="ident">app_manager</span>.<span class="ident">move_to_next_app</span>();
<span class="ident">drop</span>(<span class="ident">app_manager</span>);
<span class="comment">// before this we have to drop local variables related to resources manually</span>
<span class="comment">// and release the resources</span>
<span class="kw">extern</span> <span class="string">&quot;C&quot;</span> {
<span class="kw">fn</span> <span class="ident">__restore</span>(<span class="ident">cx_addr</span>: <span class="ident">usize</span>);
}
<span class="kw">unsafe</span> {
<span class="ident">__restore</span>(<span class="ident">KERNEL_STACK</span>.<span class="ident">push_context</span>(<span class="ident">TrapContext::app_init_context</span>(
<span class="ident">APP_BASE_ADDRESS</span>,
<span class="ident">USER_STACK</span>.<span class="ident">get_sp</span>(),
)) <span class="kw">as</span> <span class="kw-2">*const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">usize</span>);
}
<span class="macro">panic!</span>(<span class="string">&quot;Unreachable in batch::run_current_app!&quot;</span>);
}
</code></pre></div>
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