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ZealOS/docs/Demo/Asm/MulByHand.CC.html
TomAwezome 01e5d408fd Add PopUp with OS Upgrade explanation. 
Fix unused var warning in OSUpgrade.
Add Who() output to main generated HTML index file.
Rename all 'inst' to 'instruction'.
Change NetLog behaviour, remove window tiling.
Change network stack to throw if no applicable driver can be loaded.
Update line counts.
2021-07-05 22:57:17 -04:00

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<a name="l1"></a><span class=cF2>/*When Terry Davis was a kid with a Commodore 64,</span><span class=cF0>
<a name="l2"></a></span><span class=cF2>the 6502 chip had no multiply instruction</span><span class=cF0>
<a name="l3"></a></span><span class=cF2>and this is how he had to do it, except,</span><span class=cF0>
<a name="l4"></a></span><span class=cF2>he used more regs in this example.</span><span class=cF0>
<a name="l5"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l6"></a></span><span class=cF1>asm</span><span class=cF0> {
<a name="l7"></a></span><span class=cF2>//Opcodes are slightly different to make writing the x86_64 assembler easier.</span><span class=cF0>
<a name="l8"></a></span><span class=cF2>//See </span><a href="https://tomawezome.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="l9"></a>
<a name="l10"></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="l11"></a>
<a name="l12"></a>MUL_BY_HAND_U8_U8_TO_U16: </span><span class=cF2>//This is only for fun.</span><span class=cF0>
<a name="l13"></a></span><span class=cF2>//8bit * 8bit--&gt;16bit</span><span class=cF0>
<a name="l14"></a></span><span class=cF2>//AL*BL--&gt;AX</span><span class=cF0>
<a name="l15"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CL</span><span class=cF0>, </span><span class=cFE>8</span><span class=cF0>
<a name="l16"></a> </span><span class=cF1>SHL</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>8</span><span class=cF0>
<a name="l17"></a>@@05: </span><span class=cF1>SHL1</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>
<a name="l18"></a> </span><span class=cF1>JNC</span><span class=cF0> @@10
<a name="l19"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cFC>BL</span><span class=cF0>
<a name="l20"></a>@@10: </span><span class=cF1>DEC</span><span class=cF0> </span><span class=cFC>CL</span><span class=cF0>
<a name="l21"></a> </span><span class=cF1>JNZ</span><span class=cF0> @@05
<a name="l22"></a> </span><span class=cF1>RET</span><span class=cF0>
<a name="l23"></a>
<a name="l24"></a>_MUL_BY_HAND_U8_U8_TO_U16:: </span><span class=cF2>//C callable</span><span class=cF0>
<a name="l25"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l26"></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="l27"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cF1>U8</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://tomawezome.github.io/ZealOS/Kernel/KernelA.HH.html#l714"><span class=cF4>SF_ARG1</span></a><span class=cF0>
<a name="l28"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>BL</span><span class=cF0>, </span><span class=cF1>U8</span><span class=cF0> </span><span class=cF3>SF_ARG2</span><span class=cF0>[</span><span class=cFC>RBP</span><span class=cF0>]
<a name="l29"></a> </span><span class=cF1>CALL</span><span class=cF0> MUL_BY_HAND_U8_U8_TO_U16
<a name="l30"></a> </span><span class=cF1>MOVZX</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l31"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l32"></a> </span><span class=cF1>RET1</span><span class=cF0> </span><span class=cFE>16</span><span class=cF0>
<a name="l33"></a>
<a name="l34"></a>_MUL_U64_U64_TO_U128::
<a name="l35"></a></span><span class=cF2>//64bit * 64bit--&gt;128bit</span><span class=cF0>
<a name="l36"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l37"></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="l38"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RBX</span><span class=cF0>, </span><span class=cF9>U64</span><span class=cF0> </span><span class=cF3>SF_ARG3</span><span class=cF0>[</span><span class=cFC>RBP</span><span class=cF0>]
<a name="l39"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RAX</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://tomawezome.github.io/ZealOS/Kernel/KernelA.HH.html#l714"><span class=cF4>SF_ARG1</span></a><span class=cF0>
<a name="l40"></a> </span><span class=cF1>MUL</span><span class=cF0> </span><span class=cF9>U64</span><span class=cF0> </span><span class=cF3>SF_ARG2</span><span class=cF0>[</span><span class=cFC>RBP</span><span class=cF0>] </span><span class=cF2>//Res RDX:RAX 128bit</span><span class=cF0>
<a name="l41"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U64</span><span class=cF0> [</span><span class=cFC>RBX</span><span class=cF0>], </span><span class=cFC>RAX</span><span class=cF0>
<a name="l42"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U64</span><span class=cF0> </span><span class=cFE>8</span><span class=cF0>[</span><span class=cFC>RBX</span><span class=cF0>], </span><span class=cFC>RDX</span><span class=cF0>
<a name="l43"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l44"></a> </span><span class=cF1>RET1</span><span class=cF0> </span><span class=cFE>24</span><span class=cF0>
<a name="l45"></a>};
<a name="l46"></a>
<a name="l47"></a></span><span class=cF2>//The convention is to put an underscore</span><span class=cF0>
<a name="l48"></a></span><span class=cF2>//on C callable asm routines.</span><span class=cF0>
<a name="l49"></a></span><span class=cF1>_extern</span><span class=cF0> _MUL_BY_HAND_U8_U8_TO_U16 </span><span class=cF9>U16</span><span class=cF0> MulU8(</span><span class=cF1>U8</span><span class=cF0> n1, </span><span class=cF1>U8</span><span class=cF0> n2);
<a name="l50"></a>
<a name="l51"></a></span><span class=cF1>class</span><span class=cF0> U128
<a name="l52"></a>{
<a name="l53"></a> </span><span class=cF9>U64</span><span class=cF0> lo, hi;
<a name="l54"></a>};
<a name="l55"></a>
<a name="l56"></a></span><span class=cF1>_extern</span><span class=cF0> _MUL_U64_U64_TO_U128 </span><span class=cF1>U0</span><span class=cF0> MulU64(</span><span class=cF9>I64</span><span class=cF0> n1, </span><span class=cF9>I64</span><span class=cF0> n2, U128 *_prod);
<a name="l57"></a>
<a name="l58"></a></span><span class=cF1>U0</span><span class=cF0> MulByHand()
<a name="l59"></a>{
<a name="l60"></a> U128 p;
<a name="l61"></a>
<a name="l62"></a> </span><span class=cF6>&quot;2*7 =0x%X\n&quot;</span><span class=cF0>, MulU8(</span><span class=cFE>2</span><span class=cF0>, </span><span class=cFE>7</span><span class=cF0>);
<a name="l63"></a> </span><span class=cF6>&quot;100*10=0x%X\n&quot;</span><span class=cF0>, MulU8(</span><span class=cFE>100</span><span class=cF0>, </span><span class=cFE>10</span><span class=cF0>);
<a name="l64"></a>
<a name="l65"></a> MulU64(</span><span class=cFE>0x0123456789ABCDEF</span><span class=cF0>, </span><span class=cFE>0x1000001</span><span class=cF0>, &amp;p);
<a name="l66"></a> </span><span class=cF6>&quot;0x0123466789ABCDEF*0x1000001=0x%016X%016X\n&quot;</span><span class=cF0>, p.hi, p.lo;
<a name="l67"></a>}
<a name="l68"></a>
<a name="l69"></a>MulByHand;
<a name="l70"></a>
</span></pre></body>
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