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ZealOS/docs/Demo/Asm/AsmAndC2.CC.html
TomAwezome dd959b40c5 Add progress bar to DVDImageRead.
2021-08-17 02:47:37 -04:00

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<a name="l1"></a><span class=cF2>/*Asm labels can only be defined once</span><span class=cF0>
<a name="l2"></a></span><span class=cF2>in a task. &lt;F5&gt; will spawn a new task</span><span class=cF0>
<a name="l3"></a></span><span class=cF2>each time, so you don't get redefine</span><span class=cF0>
<a name="l4"></a></span><span class=cF2>error, like when repeatedly #including</span><span class=cF0>
<a name="l5"></a></span><span class=cF2>it from the cmd line.</span><span class=cF0>
<a name="l6"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l7"></a>
<a name="l8"></a></span><span class=cF2>//This is to demo global var access.</span><span class=cF0>
<a name="l9"></a></span><span class=cF2>//Glbs defined elsewhere can accessed too, like counts.jiffies.</span><span class=cF0>
<a name="l10"></a></span><span class=cF9>I64</span><span class=cF0> global_ona = </span><span class=cF5>Freq2Ona</span><span class=cF0>(</span><span class=cFE>400</span><span class=cF0>), global_ona_step = </span><span class=cFE>10</span><span class=cF0>, global_ona_base = </span><span class=cF5>Freq2Ona</span><span class=cF0>(</span><span class=cFE>100</span><span class=cF0>);
<a name="l11"></a>
<a name="l12"></a></span><span class=cF1>asm</span><span class=cF0> {
<a name="l13"></a></span><span class=cF2>//Opcodes are slightly different to make writing the x86_64 assembler easier.</span><span class=cF0>
<a name="l14"></a></span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Compiler/OpCodes.DD.html#l1"><span class=cF4>::/Compiler/OpCodes.DD</span></a><span class=cF2>.</span><span class=cF0>
<a name="l15"></a>
<a name="l16"></a>JIFFIES_MESSAGE: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF6>&quot;Jiffies:&quot;</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>;
<a name="l17"></a>
<a name="l18"></a></span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/StrA.CC.html#l1"><span class=cF4>::/Kernel/StrA.CC</span></a><span class=cF2> and </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KUtils.CC.html#l1"><span class=cF4>::/Kernel/KUtils.CC</span></a><span class=cF2>.</span><span class=cF0>
<a name="l19"></a>
<a name="l20"></a>_BEEPS2::
<a name="l21"></a></span><span class=cF2>//You can clobber RAX,RBX,RCX,RDX,R8,R9.</span><span class=cF0> </span><span class=cF2>The compiler expects that.</span><span class=cF0>
<a name="l22"></a></span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1936"><span class=cF4>REGG_CLOBBERED</span></a><span class=cF2> and </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1938"><span class=cF4>REGG_STACK_TMP</span></a><span class=cF2>.</span><span class=cF0>
<a name="l23"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l24"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>, </span><span class=cFC>RSP</span><span class=cF0>
<a name="l25"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>, </span><span class=cF9>U64</span><span class=cF0> </span><span class=cF3>SF_ARG1</span><span class=cF0>[</span><span class=cFC>RBP</span><span class=cF0>] </span><span class=cF2>//</span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l715"><span class=cF4>SF_ARG1</span></a><span class=cF0>
<a name="l26"></a>
<a name="l27"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cF9>U64</span><span class=cF0> [&amp;</span><span class=cFB>counts</span><span class=cF0>.jiffies]
<a name="l28"></a>
<a name="l29"></a>@@05: </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>
<a name="l30"></a></span><span class=cF2>//U0 </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KMisc.CC.html#l200"><span class=cF4>Beep</span></a><span class=cF2>(I8 ona=62, Bool busy=FALSE)</span><span class=cF0>
<a name="l31"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0> </span><span class=cF2>//Do not busy (spin) wait</span><span class=cF0>
<a name="l32"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cF9>U64</span><span class=cF0> [&amp;global_ona] </span><span class=cF2>//evaluated at run time</span><span class=cF0>
<a name="l33"></a> </span><span class=cF1>CALL</span><span class=cF0> &amp;</span><span class=cF5>Beep</span><span class=cF0>
<a name="l34"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>
<a name="l35"></a> </span><span class=cF1>LOOP</span><span class=cF0> @@05
<a name="l36"></a>
<a name="l37"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0> </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1939"><span class=cF4>REGG_LOCAL_VARS</span></a><span class=cF2> &amp; </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1940"><span class=cF4>REGG_LOCAL_NON_PTR_VARS</span></a><span class=cF0>
<a name="l38"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>, JIFFIES_MESSAGE
<a name="l39"></a> </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cFD>PUT_STR</span><span class=cF0>
<a name="l40"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>
<a name="l41"></a>
<a name="l42"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>
<a name="l43"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, </span><span class=cF9>U64</span><span class=cF0> [&amp;</span><span class=cFB>counts</span><span class=cF0>.jiffies]
<a name="l44"></a> </span><span class=cF1>NEG</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>
<a name="l45"></a> </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cFD>PUT_HEX_U64</span><span class=cF0>
<a name="l46"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, </span><span class=cF6>'\n'</span><span class=cF0>
<a name="l47"></a> </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cFD>PUT_CHARS</span><span class=cF0>
<a name="l48"></a>
<a name="l49"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l50"></a> </span><span class=cF1>RET1</span><span class=cF0> </span><span class=cFE>8</span><span class=cF0>
<a name="l51"></a>}
<a name="l52"></a>
<a name="l53"></a></span><span class=cF2>//The convention is to put an underscore</span><span class=cF0>
<a name="l54"></a></span><span class=cF2>//on C callable asm routines.</span><span class=cF0>
<a name="l55"></a></span><span class=cF1>_extern</span><span class=cF0> _BEEPS2 </span><span class=cF1>U0</span><span class=cF0> Beeps2(</span><span class=cF9>I64</span><span class=cF0> count);
<a name="l56"></a>
<a name="l57"></a></span><span class=cF1>U0</span><span class=cF0> AsmAndC2()
<a name="l58"></a>{
<a name="l59"></a> </span><span class=cF9>I64</span><span class=cF0> </span><span class=cF1>reg</span><span class=cF0> </span><span class=cFC>R15</span><span class=cF0> i;
<a name="l60"></a>
<a name="l61"></a> i = </span><span class=cF5>I64Get</span><span class=cF0>(</span><span class=cF6>&quot;$PURPLE$\n\nNum of beeps 1-5 (%d):$FG$&quot;</span><span class=cF0>, </span><span class=cFE>3</span><span class=cF0>, </span><span class=cFE>1</span><span class=cF0>, </span><span class=cFE>5</span><span class=cF0>);
<a name="l62"></a> Beeps2(i);
<a name="l63"></a>
<a name="l64"></a> </span><span class=cF1>asm</span><span class=cF0> </span><span class=cF7>{</span><span class=cF0>
<a name="l65"></a> </span><span class=cF1>LIST</span><span class=cF0>
<a name="l66"></a></span><span class=cF2>//You can clobber RAX,RBX,RCX,RDX, but preserve the rest.</span><span class=cF0>
<a name="l67"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>, </span><span class=cFC>R15</span><span class=cF0> </span><span class=cF2>//You can clobber RAX,RBX,RCX,RDX. Preserve the rest.</span><span class=cF0>
<a name="l68"></a> @@05: </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>
<a name="l69"></a>
<a name="l70"></a></span><span class=cF2>//U0 </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KMisc.CC.html#l129"><span class=cF4>Sound</span></a><span class=cF2>(I8 ona);</span><span class=cF0>
<a name="l71"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, </span><span class=cFC>RCX</span><span class=cF0> </span><span class=cF2>//ona=loop*10+100.0Hz</span><span class=cF0>
<a name="l72"></a> </span><span class=cF1>IMUL2</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, global_ona_step </span><span class=cF2>//Intentionally evaluated at compile time</span><span class=cF0>
<a name="l73"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, </span><span class=cF9>U64</span><span class=cF0> [&amp;global_ona_base] </span><span class=cF2>//Intentionally evaluated at run time</span><span class=cF0>
<a name="l74"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>
<a name="l75"></a> </span><span class=cF1>CALL</span><span class=cF0> &amp;</span><span class=cF5>Sound</span><span class=cF0> </span><span class=cF2>//We can skip IMPORT with &amp; if JIT compiling.</span><span class=cF0>
<a name="l76"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>, </span><span class=cFB>counts</span><span class=cF0>.time_stamp_freq &gt;&gt; </span><span class=cFE>3</span><span class=cF0> </span><span class=cF2>//JIT Const.</span><span class=cF0> </span><span class=cF2>Simple delay loop.</span><span class=cF0>
<a name="l77"></a>@@10: </span><span class=cF1>LOOP</span><span class=cF0> @@10
<a name="l78"></a>
<a name="l79"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RCX</span><span class=cF0>
<a name="l80"></a> </span><span class=cF1>LOOP</span><span class=cF0> @@05
<a name="l81"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l82"></a> </span><span class=cF5>Sound</span><span class=cF0>;
<a name="l83"></a>}
<a name="l84"></a>
<a name="l85"></a>AsmAndC2;
</span></pre></body>
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