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ZealOS/docs/Kernel/KStart16.ZC.html
TomAwezome 48d4f999cb Update documentation.
2021-12-11 06:10:58 -05:00

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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF1>asm</span><span class=cF0> {</span><span class=cF2>/* See </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/Boot.DD.html#l1"><span class=cF4>::/Doc/Boot.DD</span></a><span class=cF2>.</span><span class=cF0>
<a name="l2"></a></span><span class=cF2>ZealOS starts in real, calls some BIOS routines, switches to 32 bit, and 64 bit mode and continues in </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/ZealC.DD.html#l1"><span class=cF4>ZealC</span></a><span class=cF2> at </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KMain.ZC.html#l143"><span class=cF4>KMain</span></a><span class=cF2>().</span><span class=cF0>
<a name="l3"></a>
<a name="l4"></a></span><span class=cF2>The boot loader jumps here in real-mode (16-bit).</span><span class=cF0>
<a name="l5"></a></span><span class=cF2>It actually jumps to the </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l452"><span class=cF4>CBinFile</span></a><span class=cF2> header which is placed just before this by </span><a href="https://zeal-operating-system.github.io/ZealOS/Compiler/CMain.ZC.html#l628"><span class=cF4>the compiler</span></a><span class=cF2>.</span><span class=cF0>
<a name="l6"></a></span><span class=cF2>The header begins with a short jmp to the start of this file's code which begins with the following small jump past some data.</span><span class=cF0>
<a name="l7"></a>
<a name="l8"></a></span><span class=cF2>This file is first in the Kernel image because it is #included first. </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/Kernel.PRJ.html#l14"><span class=cF4>Kernel.PRJ</span></a><span class=cF0>
<a name="l9"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l10"></a></span><span class=cF1>USE16</span><span class=cF0>
<a name="l11"></a></span><span class=cFD>SYS_KERNEL</span><span class=cF0>:: </span><span class=cF2>//This must match </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l548"><span class=cF4>CKernel</span></a><span class=cF2>.</span><span class=cF0>
<a name="l12"></a> </span><span class=cF1>JMP</span><span class=cF0> </span><span class=cF9>I16</span><span class=cF0> </span><span class=cFD>CORE0_16BIT_INIT</span><span class=cF0>
<a name="l13"></a>
<a name="l14"></a></span><span class=cF2>//************************************</span><span class=cF0>
<a name="l15"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>ASM Global variables required for 16-bit start-up</span><span class=cF0>
<a name="l16"></a> </span><span class=cF1>ALIGN</span><span class=cF0> </span><span class=cFE>4</span><span class=cF0>, </span><span class=cF3>OC_NOP</span><span class=cF0>
<a name="l17"></a>
<a name="l18"></a></span><span class=cFD>SYS_BOOT_SRC</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cF3>BOOT_SRC_NULL</span><span class=cF0>;
<a name="l19"></a></span><span class=cFD>SYS_BOOT_BLK</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l20"></a></span><span class=cFD>SYS_BOOT_PATCH_TABLE_BASE</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l21"></a></span><span class=cFD>SYS_RUN_LEVEL</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l22"></a>
<a name="l23"></a>#</span><span class=cF1>exe</span><span class=cF0>
<a name="l24"></a></span><span class=cF7>{</span><span class=cF0>
<a name="l25"></a> </span><span class=cF5>StreamPrint</span><span class=cF0>(</span><span class=cF6>&quot;SYS_COMPILE_TIME:: DU64 0x%X;&quot;</span><span class=cF0>, </span><span class=cF5>Now</span><span class=cF0>); </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/BlkDev/DiskAHCI.ZC.html#l1131"><span class=cF4>AHCIBootDVDProbeAll</span></a><span class=cF0>
<a name="l26"></a></span><span class=cF7>}</span><span class=cF0>;
<a name="l27"></a>
<a name="l28"></a>#</span><span class=cF1>assert</span><span class=cF0> </span><span class=cFD>SYS_COMPILE_TIME</span><span class=cF0> + </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CDate</span><span class=cF0>) + </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CBinFile</span><span class=cF0>) &lt; </span><span class=cF3>DVD_BLK_SIZE</span><span class=cF0>
<a name="l29"></a>
<a name="l30"></a></span><span class=cFD>MEM_BOOT_BASE</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//Offset from start used by reboot</span><span class=cF0>
<a name="l31"></a></span><span class=cFD>MEM_E801</span><span class=cF0>:: </span><span class=cF1>DU16</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>;
<a name="l32"></a></span><span class=cFD>MEM_E820</span><span class=cF0>:: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF3>MEM_E820_ENTRIES_NUM</span><span class=cF0> * </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CMemE820</span><span class=cF0>) </span><span class=cF1>DUP</span><span class=cF0> (</span><span class=cFE>0</span><span class=cF0>);
<a name="l33"></a></span><span class=cFD>MEM_PHYSICAL_SPACE</span><span class=cF0>:: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l34"></a></span><span class=cFD>SYS_GDT_PTR</span><span class=cF0>:: </span><span class=cF1>DU16</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CGDT</span><span class=cF0>) - </span><span class=cFE>1</span><span class=cF0>;
<a name="l35"></a> </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l36"></a></span><span class=cFD>SYS_PCI_BUSES</span><span class=cF0>:: </span><span class=cF1>DU16</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l37"></a>
<a name="l38"></a> </span><span class=cF1>ALIGN</span><span class=cF0> </span><span class=cFE>16</span><span class=cF0>, </span><span class=cF3>OC_NOP</span><span class=cF0>
<a name="l39"></a>
<a name="l40"></a></span><span class=cFD>SYS_GDT</span><span class=cF0>:: </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l396"><span class=cF4>CGDT</span></a><span class=cF0>
<a name="l41"></a>GDT_NULL: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>,</span><span class=cFE>0</span><span class=cF0>;
<a name="l42"></a>GDT_BOOT_DS: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00CF92000000FFFF</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//Gets patched.</span><span class=cF0>
<a name="l43"></a>GDT_BOOT_CS: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00CF9A000000FFFF</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//Gets patched.</span><span class=cF0>
<a name="l44"></a>GDT_CS32: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00CF9A000000FFFF</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>;
<a name="l45"></a>GDT_CS64: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00209A0000000000</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//The </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/Charter.DD.html#l1"><span class=cF4>Charter</span></a><span class=cF2> says just ring0.</span><span class=cF0>
<a name="l46"></a>GDT_CS64_RING3: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x0020FA0000000000</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//</span><a href="https://zeal-operating-system.github.io/ZealOS/Demo/Lectures/Ring3.ZC.html#l1"><span class=cF4>Ring3</span></a><span class=cF2>, so you can play with.</span><span class=cF0>
<a name="l47"></a>GDT_DS: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00CF92000000FFFF</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>;
<a name="l48"></a>GDT_DS_RING3: </span><span class=cF1>DU64</span><span class=cF0> </span><span class=cFE>0x00CFF2000000FFFF</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>;
<a name="l49"></a>GDT_TR: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF3>MP_PROCESSORS_NUM</span><span class=cF0> * </span><span class=cFE>16</span><span class=cF0> </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l50"></a>GDT_TR_RING3: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF3>MP_PROCESSORS_NUM</span><span class=cF0> * </span><span class=cFE>16</span><span class=cF0> </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l51"></a>#</span><span class=cF1>assert</span><span class=cF0> $ - </span><span class=cFD>SYS_GDT</span><span class=cF0> == </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CGDT</span><span class=cF0>)
<a name="l52"></a>
<a name="l53"></a></span><span class=cFD>SYS_FONT_PTR</span><span class=cF0>:: </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l54"></a>
<a name="l55"></a></span><span class=cFD>SYS_VBE_INFO</span><span class=cF0>:: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEInfo</span><span class=cF0>) </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l56"></a></span><span class=cFD>SYS_VBE_MODES</span><span class=cF0>:: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEModeShort</span><span class=cF0>) * </span><span class=cF3>VBE_MODES_NUM</span><span class=cF0> </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l57"></a></span><span class=cFD>SYS_VBE_FINAL_MODE</span><span class=cF0>:: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEMode</span><span class=cF0>) </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l58"></a></span><span class=cFD>SYS_VBE_FINAL_MODE_NUM</span><span class=cF0>::</span><span class=cF1>DU16</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>//mode number of final mode set</span><span class=cF0>
<a name="l59"></a>#</span><span class=cF1>assert</span><span class=cF0> $ - </span><span class=cFD>SYS_KERNEL</span><span class=cF0> == </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CKernel</span><span class=cF0>) - </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CBinFile</span><span class=cF0>)
<a name="l60"></a>
<a name="l61"></a>TEMP_VBE_MODE: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEMode</span><span class=cF0>) </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l62"></a>MAX_VBE_MODE: </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEModeShort</span><span class=cF0>) </span><span class=cF1>DUP</span><span class=cF0>(</span><span class=cFE>0</span><span class=cF0>);
<a name="l63"></a>MAX_SCREEN_HEIGHT: </span><span class=cF1>DU16</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l64"></a>
<a name="l65"></a>#</span><span class=cF1>exe</span><span class=cF0>
<a name="l66"></a></span><span class=cF7>{</span><span class=cF0>
<a name="l67"></a> </span><span class=cF5>StreamPrint</span><span class=cF0>(</span><span class=cF6>&quot;SCREEN_WIDTH:</span><span class=cF0> </span><span class=cF6>DU16</span><span class=cF0> </span><span class=cF6>%d;&quot;</span><span class=cF0>
<a name="l68"></a> </span><span class=cF6>&quot;SCREEN_HEIGHT: DU16</span><span class=cF0> </span><span class=cF6>%d;&quot;</span><span class=cF0>, kernel_config-&gt;screen_width, kernel_config-&gt;screen_height);
<a name="l69"></a></span><span class=cF7>}</span><span class=cF0>;
<a name="l70"></a>
<a name="l71"></a></span><span class=cF2>//************************************</span><span class=cF0>
<a name="l72"></a></span><span class=cFD>CORE0_16BIT_INIT</span><span class=cF0>::
<a name="l73"></a></span><span class=cF2>//EAX is </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KStart16.ZC.html#l311"><span class=cF4>SYS_BOOT_SRC</span></a><span class=cF2>. (Value passed from boot block, </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootHD.ZC.html#l84"><span class=cF4>BootHD</span></a><span class=cF2>, </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootDVD.ZC.html#l175"><span class=cF4>BootDVD</span></a><span class=cF2>, &amp; </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootRAM.ZC.html#l46"><span class=cF4>BootRAM</span></a><span class=cF2>.)</span><span class=cF0>
<a name="l74"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0>, </span><span class=cFC>EAX</span><span class=cF0>
<a name="l75"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, (</span><span class=cF3>BOOT_RAM_LIMIT</span><span class=cF0> - </span><span class=cF3>BOOT_STACK_SIZE</span><span class=cF0>) / </span><span class=cFE>16</span><span class=cF0>
<a name="l76"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>SS</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l77"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>SP</span><span class=cF0>, </span><span class=cF3>BOOT_STACK_SIZE</span><span class=cF0>
<a name="l78"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0> </span><span class=cF2>//Will be </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KStart16.ZC.html#l311"><span class=cF4>SYS_BOOT_SRC</span></a><span class=cF2>. See </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootHD.ZC.html#l84"><span class=cF4>BootHD</span></a><span class=cF2>, </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootDVD.ZC.html#l175"><span class=cF4>BootDVD</span></a><span class=cF2> &amp; </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootRAM.ZC.html#l46"><span class=cF4>BootRAM</span></a><span class=cF2>.</span><span class=cF0>
<a name="l79"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>
<a name="l80"></a> </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> GET_IP
<a name="l81"></a>GET_IP: </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>
<a name="l82"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, GET_IP
<a name="l83"></a> </span><span class=cF1>SHR</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, </span><span class=cFE>4</span><span class=cF0>
<a name="l84"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>CS</span><span class=cF0>
<a name="l85"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>BX</span><span class=cF0>
<a name="l86"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>
<a name="l87"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> @@04
<a name="l88"></a> </span><span class=cF1>RETF</span><span class=cF0>
<a name="l89"></a>
<a name="l90"></a>@@04: </span><span class=cF1>STI</span><span class=cF0>
<a name="l91"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>CS</span><span class=cF0>
<a name="l92"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l93"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_RUN_LEVEL</span><span class=cF0>], </span><span class=cF3>RLF_16BIT</span><span class=cF0>
<a name="l94"></a>
<a name="l95"></a></span><span class=cF2>//Our variables are on the data segment, but VBE functions require ES.</span><span class=cF0>
<a name="l96"></a></span><span class=cF2>//moving DS into ES, while preserving ES</span><span class=cF0>
<a name="l97"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l98"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>
<a name="l99"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l100"></a>
<a name="l101"></a></span><span class=cF2>//Get VBE implementation information</span><span class=cF0>
<a name="l102"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x4F00</span><span class=cF0>
<a name="l103"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DI</span><span class=cF0>, </span><span class=cFD>SYS_VBE_INFO</span><span class=cF0>
<a name="l104"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>CVBEInfo</span><span class=cF0>.signature[</span><span class=cFC>DI</span><span class=cF0>], </span><span class=cF6>'VBE2'</span><span class=cF0> </span><span class=cF2>//set to 'VBE2' to use VBE 2.0 functionality</span><span class=cF0>
<a name="l105"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x10</span><span class=cF0>
<a name="l106"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l107"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x004F</span><span class=cF0>
<a name="l108"></a> </span><span class=cF1>JE</span><span class=cF0> @@05
<a name="l109"></a> </span><span class=cF1>JMP</span><span class=cF0> $ </span><span class=cF2>//Freeze system if VBE not supported</span><span class=cF0>
<a name="l110"></a>
<a name="l111"></a>@@05:
<a name="l112"></a>
<a name="l113"></a></span><span class=cF2>/*Loop variables:</span><span class=cF0>
<a name="l114"></a></span><span class=cF2> DI &lt;- Temporary storage for mode information</span><span class=cF0>
<a name="l115"></a></span><span class=cF2> CX &lt;- Mode number</span><span class=cF0>
<a name="l116"></a></span><span class=cF2> DX &lt;- mode array</span><span class=cF0>
<a name="l117"></a></span><span class=cF2> GS &lt;- Segment for video modes list</span><span class=cF0>
<a name="l118"></a></span><span class=cF2> SI &lt;- Offset for video modes list</span><span class=cF0>
<a name="l119"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l120"></a></span><span class=cF2>//Obtain segment:offset of list of potential video modes</span><span class=cF0>
<a name="l121"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFD>SYS_VBE_INFO</span><span class=cF0>
<a name="l122"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>SI</span><span class=cF0>, </span><span class=cF9>CVBEInfo</span><span class=cF0>.video_modes[</span><span class=cFC>AX</span><span class=cF0>]
<a name="l123"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>GS</span><span class=cF0>, </span><span class=cF9>CVBEInfo</span><span class=cF0>.video_modes+</span><span class=cFE>2</span><span class=cF0>[</span><span class=cFC>AX</span><span class=cF0>]
<a name="l124"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DI</span><span class=cF0>, TEMP_VBE_MODE
<a name="l125"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cFD>SYS_VBE_MODES</span><span class=cF0>
<a name="l126"></a>
<a name="l127"></a>@@06: </span><span class=cF2>//Loop through all the mode numbers</span><span class=cF0>
<a name="l128"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>GS</span><span class=cF0>:[</span><span class=cFC>SI</span><span class=cF0>]
<a name="l129"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0xFFFF</span><span class=cF0> </span><span class=cF2>//FFFF signifies the end of the list</span><span class=cF0>
<a name="l130"></a> </span><span class=cF1>JE</span><span class=cF0> @@08
<a name="l131"></a>
<a name="l132"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>SI</span><span class=cF0>, </span><span class=cFE>2</span><span class=cF0> </span><span class=cF2>//Increment pointer to read next U16 mode</span><span class=cF0>
<a name="l133"></a>
<a name="l134"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l135"></a> </span><span class=cF1>BTS</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, </span><span class=cFE>14</span><span class=cF0> </span><span class=cF2>//Set linear framebuffer bit in the mode number we are about to pass to the BIOS below</span><span class=cF0>
<a name="l136"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l137"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>
<a name="l138"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l139"></a></span><span class=cF2>//Get mode information for mode number</span><span class=cF0>
<a name="l140"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x4F01</span><span class=cF0>
<a name="l141"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x10</span><span class=cF0>
<a name="l142"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l143"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x004F</span><span class=cF0>
<a name="l144"></a> </span><span class=cF1>JNE</span><span class=cF0> @@06 </span><span class=cF2>//if call to get mode information failed</span><span class=cF0>
<a name="l145"></a>
<a name="l146"></a></span><span class=cF2>//filter everything but 32-bit color</span><span class=cF0>
<a name="l147"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cF9>CVBEMode</span><span class=cF0>.bpp[</span><span class=cFC>DI</span><span class=cF0>]
<a name="l148"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cFE>32</span><span class=cF0>
<a name="l149"></a> </span><span class=cF1>JNE</span><span class=cF0> @@06
<a name="l150"></a>
<a name="l151"></a></span><span class=cF2>//Check if the mode is actually supported</span><span class=cF0>
<a name="l152"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cF9>CVBEMode</span><span class=cF0>.attributes[</span><span class=cFC>DI</span><span class=cF0>]
<a name="l153"></a> </span><span class=cF1>AND</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x91</span><span class=cF0> </span><span class=cF2>//bit 0 = supported, bit 4 = graphics mode, bit 7 = linear framebuffer</span><span class=cF0>
<a name="l154"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x91</span><span class=cF0>
<a name="l155"></a> </span><span class=cF1>JNE</span><span class=cF0> @@06
<a name="l156"></a>
<a name="l157"></a></span><span class=cF2>//Only want memory model of packed pixel or direct color (RGB)</span><span class=cF0>
<a name="l158"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>MOV </span><span class=cF0> </span><span class=cF2>AX, CVBEMode.memory_model[DI]</span><span class=cF0>
<a name="l159"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>CMP </span><span class=cF0> </span><span class=cF2>AX, 4</span><span class=cF0>
<a name="l160"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>JNE </span><span class=cF0> </span><span class=cF2>@@06</span><span class=cF0>
<a name="l161"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>CMP </span><span class=cF0> </span><span class=cF2>AX, 6</span><span class=cF0>
<a name="l162"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>JNE </span><span class=cF0> </span><span class=cF2>@@06</span><span class=cF0>
<a name="l163"></a></span><span class=cF2>//Copy information about this mode into an element of the mode array</span><span class=cF0>
<a name="l164"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, </span><span class=cF9>CVBEMode</span><span class=cF0>.height[</span><span class=cFC>DI</span><span class=cF0>]
<a name="l165"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>CVBEModeShort</span><span class=cF0>.height[</span><span class=cFC>DX</span><span class=cF0>], </span><span class=cFC>BX</span><span class=cF0>
<a name="l166"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, [MAX_SCREEN_HEIGHT]
<a name="l167"></a> </span><span class=cF1>JL</span><span class=cF0> @@07
<a name="l168"></a>
<a name="l169"></a> </span><span class=cF1>MOV</span><span class=cF0> [MAX_SCREEN_HEIGHT], </span><span class=cFC>BX</span><span class=cF0>
<a name="l170"></a> </span><span class=cF1>MOV</span><span class=cF0> [MAX_VBE_MODE], </span><span class=cFC>CX</span><span class=cF0>
<a name="l171"></a>
<a name="l172"></a>@@07: </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cF9>CVBEMode</span><span class=cF0>.width[</span><span class=cFC>DI</span><span class=cF0>]
<a name="l173"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>CVBEModeShort</span><span class=cF0>.width[</span><span class=cFC>DX</span><span class=cF0>], </span><span class=cFC>AX</span><span class=cF0>
<a name="l174"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>MOV</span><span class=cF0> </span><span class=cF2>EAX, CVBEMode.max_pixel_clock[DI]</span><span class=cF0>
<a name="l175"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>MOV</span><span class=cF0> </span><span class=cF2>CVBEModeShort.max_pixel_clock[DX], EAX</span><span class=cF0>
<a name="l176"></a>
<a name="l177"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>CVBEModeShort</span><span class=cF0>.mode_num[</span><span class=cFC>DX</span><span class=cF0>], </span><span class=cFC>CX</span><span class=cF0>
<a name="l178"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CVBEModeShort</span><span class=cF0>) </span><span class=cF2>//next array element</span><span class=cF0>
<a name="l179"></a>
<a name="l180"></a></span><span class=cF2>//Check if width and height match</span><span class=cF0>
<a name="l181"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, [SCREEN_WIDTH]
<a name="l182"></a> </span><span class=cF1>JNE</span><span class=cF0> @@06
<a name="l183"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, [SCREEN_HEIGHT]
<a name="l184"></a> </span><span class=cF1>JNE</span><span class=cF0> @@06
<a name="l185"></a>
<a name="l186"></a></span><span class=cF2>//If we've made it here we have our mode</span><span class=cF0>
<a name="l187"></a> </span><span class=cF1>MOV</span><span class=cF0> [</span><span class=cFD>SYS_VBE_FINAL_MODE_NUM</span><span class=cF0>], </span><span class=cFC>CX</span><span class=cF0>
<a name="l188"></a> </span><span class=cF1>JMP</span><span class=cF0> @@06
<a name="l189"></a>
<a name="l190"></a>@@08: </span><span class=cF2>//End of loop</span><span class=cF0>
<a name="l191"></a></span><span class=cF2>//If there isn't a valid mode set by user through kernel config, set the mode with the biggest height.</span><span class=cF0>
<a name="l192"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, [</span><span class=cFD>SYS_VBE_FINAL_MODE_NUM</span><span class=cF0>]
<a name="l193"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>
<a name="l194"></a> </span><span class=cF1>JNE</span><span class=cF0> @@09
<a name="l195"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, [MAX_VBE_MODE]
<a name="l196"></a> </span><span class=cF1>MOV</span><span class=cF0> [</span><span class=cFD>SYS_VBE_FINAL_MODE_NUM</span><span class=cF0>], </span><span class=cFC>CX</span><span class=cF0>
<a name="l197"></a>
<a name="l198"></a>@@09: </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l199"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>
<a name="l200"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l201"></a></span><span class=cF2>//Get mode infomration for the mode we want</span><span class=cF0>
<a name="l202"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DI</span><span class=cF0>, </span><span class=cFD>SYS_VBE_FINAL_MODE</span><span class=cF0>
<a name="l203"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, [</span><span class=cFD>SYS_VBE_FINAL_MODE_NUM</span><span class=cF0>]
<a name="l204"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x4F01</span><span class=cF0>
<a name="l205"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x10</span><span class=cF0>
<a name="l206"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l207"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x004F</span><span class=cF0>
<a name="l208"></a> </span><span class=cF1>JNE</span><span class=cF0> @@10 </span><span class=cF2>//if called failed</span><span class=cF0>
<a name="l209"></a>
<a name="l210"></a></span><span class=cF2>//Set the mode; call takes mode number in BX</span><span class=cF0>
<a name="l211"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x4F02</span><span class=cF0>
<a name="l212"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, </span><span class=cFC>CX</span><span class=cF0>
<a name="l213"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x10</span><span class=cF0>
<a name="l214"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x004F</span><span class=cF0>
<a name="l215"></a> </span><span class=cF1>JNE</span><span class=cF0> @@10
<a name="l216"></a>
<a name="l217"></a> </span><span class=cF1>BTS</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_RUN_LEVEL</span><span class=cF0>], </span><span class=cF3>RLf_VESA</span><span class=cF0>
<a name="l218"></a>@@10:
<a name="l219"></a>
<a name="l220"></a></span><span class=cF2>//Get pointer to 8x8 VGA ROM font.</span><span class=cF0>
<a name="l221"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0x1130</span><span class=cF0>
<a name="l222"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>BH</span><span class=cF0>, </span><span class=cFE>3</span><span class=cF0>
<a name="l223"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x10</span><span class=cF0>
<a name="l224"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>ES</span><span class=cF0>
<a name="l225"></a> </span><span class=cF1>SHL</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFE>16</span><span class=cF0>
<a name="l226"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>BP</span><span class=cF0>
<a name="l227"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_FONT_PTR</span><span class=cF0>], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l228"></a>
<a name="l229"></a></span><span class=cF2>//Get E801 memory map.</span><span class=cF0>
<a name="l230"></a></span><span class=cF2>//Output: AX = Memory between 1MiB and 16MiB in KiB (max 0x3C00 == 15 MiB)</span><span class=cF0>
<a name="l231"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2> BX = Memory after 16MiB until first memory hole in 64KiB blocks.</span><span class=cF0>
<a name="l232"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, </span><span class=cFC>CX</span><span class=cF0>
<a name="l233"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cFC>DX</span><span class=cF0>
<a name="l234"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0xE801</span><span class=cF0>
<a name="l235"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x15</span><span class=cF0>
<a name="l236"></a> </span><span class=cF1>JCXZ</span><span class=cF0> @@12 </span><span class=cF2>//if CX and DX are zero, use AX and BX instead.</span><span class=cF0>
<a name="l237"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>CX</span><span class=cF0>
<a name="l238"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>BX</span><span class=cF0>, </span><span class=cFC>DX</span><span class=cF0>
<a name="l239"></a>@@12: </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> [</span><span class=cFD>MEM_E801</span><span class=cF0>], </span><span class=cFC>AX</span><span class=cF0>
<a name="l240"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> [</span><span class=cFD>MEM_E801</span><span class=cF0>+</span><span class=cFE>2</span><span class=cF0>], </span><span class=cFC>BX</span><span class=cF0>
<a name="l241"></a>
<a name="l242"></a></span><span class=cF2>//Get E820 memory map.</span><span class=cF0>
<a name="l243"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>, </span><span class=cF3>MEM_E820_ENTRIES_NUM</span><span class=cF0> - </span><span class=cFE>1</span><span class=cF0> </span><span class=cF2>//Leave one to terminate</span><span class=cF0>
<a name="l244"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>, </span><span class=cFC>EBX</span><span class=cF0>
<a name="l245"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>
<a name="l246"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>
<a name="l247"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DI</span><span class=cF0>, </span><span class=cFD>MEM_E820</span><span class=cF0>
<a name="l248"></a>@@15: </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>
<a name="l249"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFE>0xE820</span><span class=cF0>
<a name="l250"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CMemE820</span><span class=cF0>)
<a name="l251"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cF6>'PAMS'</span><span class=cF0>
<a name="l252"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x15</span><span class=cF0>
<a name="l253"></a> </span><span class=cF1>JC</span><span class=cF0> @@20
<a name="l254"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF6>'PAMS'</span><span class=cF0>
<a name="l255"></a> </span><span class=cF1>JNE</span><span class=cF0> @@20
<a name="l256"></a> </span><span class=cF1>TEST</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>, </span><span class=cFC>EBX</span><span class=cF0>
<a name="l257"></a> </span><span class=cF1>JZ</span><span class=cF0> @@20
<a name="l258"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>DI</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CMemE820</span><span class=cF0>)
<a name="l259"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>
<a name="l260"></a> </span><span class=cF1>LOOP</span><span class=cF0> @@15
<a name="l261"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>SP</span><span class=cF0>, </span><span class=cFE>2</span><span class=cF0>
<a name="l262"></a>@@20: </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>SP</span><span class=cF0>, </span><span class=cFE>2</span><span class=cF0> </span><span class=cF2>//if called failed we want to nullify the PUSHed CX value.</span><span class=cF0>
<a name="l263"></a>
<a name="l264"></a></span><span class=cF2>//Find how much space to map, start with E801 limit.</span><span class=cF0>
<a name="l265"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFC>EAX</span><span class=cF0>
<a name="l266"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, [</span><span class=cFD>MEM_E801</span><span class=cF0>+</span><span class=cFE>2</span><span class=cF0>]
<a name="l267"></a> </span><span class=cF1>SHL</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFE>16</span><span class=cF0>
<a name="l268"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF3>SYS_16MEG_AREA_LIMIT</span><span class=cF0>
<a name="l269"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cFC>EDX</span><span class=cF0>
<a name="l270"></a>
<a name="l271"></a></span><span class=cF2>//Find max of E820 to set mapped space.</span><span class=cF0>
<a name="l272"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>SI</span><span class=cF0>, </span><span class=cFD>MEM_E820</span><span class=cF0>
<a name="l273"></a>@@25: </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CL</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.type[</span><span class=cFC>SI</span><span class=cF0>]
<a name="l274"></a> </span><span class=cF1>TEST</span><span class=cF0> </span><span class=cFC>CL</span><span class=cF0>, </span><span class=cFC>CL</span><span class=cF0>
<a name="l275"></a> </span><span class=cF1>JZ</span><span class=cF0> @@35
<a name="l276"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.base [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l277"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.base+</span><span class=cFE>4</span><span class=cF0>[</span><span class=cFC>SI</span><span class=cF0>]
<a name="l278"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.len [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l279"></a> </span><span class=cF1>ADC</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.len+</span><span class=cFE>4</span><span class=cF0> [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l280"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>EBX</span><span class=cF0>, </span><span class=cFC>EAX</span><span class=cF0>
<a name="l281"></a> </span><span class=cF1>SBB</span><span class=cF0> </span><span class=cFC>ECX</span><span class=cF0>, </span><span class=cFC>EDX</span><span class=cF0>
<a name="l282"></a> </span><span class=cF1>JC</span><span class=cF0> @@30
<a name="l283"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.base [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l284"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.base+</span><span class=cFE>4</span><span class=cF0>[</span><span class=cFC>SI</span><span class=cF0>]
<a name="l285"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.len [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l286"></a> </span><span class=cF1>ADC</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cF9>CMemE820</span><span class=cF0>.len+</span><span class=cFE>4</span><span class=cF0> [</span><span class=cFC>SI</span><span class=cF0>]
<a name="l287"></a>@@30: </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>SI</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CMemE820</span><span class=cF0>)
<a name="l288"></a> </span><span class=cF1>JMP</span><span class=cF0> @@25
<a name="l289"></a>
<a name="l290"></a>@@35: </span><span class=cF1>MOV</span><span class=cF0> [</span><span class=cFD>MEM_PHYSICAL_SPACE</span><span class=cF0>], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l291"></a> </span><span class=cF1>MOV</span><span class=cF0> [</span><span class=cFD>MEM_PHYSICAL_SPACE</span><span class=cF0>+</span><span class=cFE>4</span><span class=cF0>], </span><span class=cFC>EDX</span><span class=cF0>
<a name="l292"></a>
<a name="l293"></a></span><span class=cF2>//Get PCI Bus Info</span><span class=cF0>
<a name="l294"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> [</span><span class=cFD>SYS_PCI_BUSES</span><span class=cF0>], </span><span class=cFE>256</span><span class=cF0>
<a name="l295"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cFC>DX</span><span class=cF0>
<a name="l296"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFE>0xB101</span><span class=cF0>
<a name="l297"></a> </span><span class=cF1>INT</span><span class=cF0> </span><span class=cFE>0x1A</span><span class=cF0>
<a name="l298"></a> </span><span class=cF1>CMP</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cF6>'PC'</span><span class=cF0>
<a name="l299"></a> </span><span class=cF1>JNE</span><span class=cF0> @@40
<a name="l300"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>CH</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>
<a name="l301"></a> </span><span class=cF1>INC</span><span class=cF0> </span><span class=cFC>CX</span><span class=cF0>
<a name="l302"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U16</span><span class=cF0> [</span><span class=cFD>SYS_PCI_BUSES</span><span class=cF0>], </span><span class=cFC>CX</span><span class=cF0>
<a name="l303"></a>@@40:
<a name="l304"></a> </span><span class=cF1>CLI</span><span class=cF0>
<a name="l305"></a></span><span class=cF2>//Enable A20</span><span class=cF0>
<a name="l306"></a> </span><span class=cF1>IN</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cFE>0x92</span><span class=cF0>
<a name="l307"></a> </span><span class=cF1>OR</span><span class=cF0> </span><span class=cFC>AL</span><span class=cF0>, </span><span class=cFE>2</span><span class=cF0>
<a name="l308"></a> </span><span class=cF1>OUT</span><span class=cF0> </span><span class=cFE>0x92</span><span class=cF0>, </span><span class=cFC>AL</span><span class=cF0>
<a name="l309"></a>
<a name="l310"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_BOOT_BLK</span><span class=cF0>]
<a name="l311"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_BOOT_SRC</span><span class=cF0>] </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootHD.ZC.html#l84"><span class=cF4>BootHD</span></a><span class=cF2>, </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootDVD.ZC.html#l175"><span class=cF4>BootDVD</span></a><span class=cF2>, &amp; </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/BootRAM.ZC.html#l46"><span class=cF4>BootRAM</span></a><span class=cF2>.</span><span class=cF0>
<a name="l312"></a>
<a name="l313"></a> </span><span class=cF1>CLD</span><span class=cF0>
<a name="l314"></a> </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFC>EAX</span><span class=cF0>
<a name="l315"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>AX</span><span class=cF0>, </span><span class=cFC>CS</span><span class=cF0>
<a name="l316"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DS</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l317"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>ES</span><span class=cF0>, </span><span class=cFC>AX</span><span class=cF0>
<a name="l318"></a> </span><span class=cF1>SHL</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cFE>4</span><span class=cF0>
<a name="l319"></a>
<a name="l320"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>MEM_BOOT_BASE</span><span class=cF0>], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l321"></a>
<a name="l322"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cFC>CS</span><span class=cF0>
<a name="l323"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>DX</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CBinFile</span><span class=cF0>) / </span><span class=cFE>16</span><span class=cF0>
<a name="l324"></a>#</span><span class=cF1>assert</span><span class=cF0> !(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF9>CBinFile</span><span class=cF7>)</span><span class=cF0> &amp; </span><span class=cFE>0xF</span><span class=cF0>)
<a name="l325"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>GS</span><span class=cF0>, </span><span class=cFC>DX</span><span class=cF0>
<a name="l326"></a>
<a name="l327"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cFC>EAX</span><span class=cF0>
<a name="l328"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cF9>U32</span><span class=cF0> </span><span class=cFC>GS</span><span class=cF0>:[</span><span class=cF9>CBinFile</span><span class=cF0>.patch_table_offset]
<a name="l329"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>EDX</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF0>(</span><span class=cF9>CBinFile</span><span class=cF0>)
<a name="l330"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_BOOT_PATCH_TABLE_BASE</span><span class=cF0>], </span><span class=cFC>EDX</span><span class=cF0>
<a name="l331"></a>
<a name="l332"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [GDT_BOOT_DS+</span><span class=cFE>2</span><span class=cF0>], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l333"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [GDT_BOOT_CS+</span><span class=cFE>2</span><span class=cF0>], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l334"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF9>I32</span><span class=cF0> </span><span class=cFD>SYS_GDT</span><span class=cF0>
<a name="l335"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_GDT_PTR</span><span class=cF0> + </span><span class=cF9>CSysLimitBase</span><span class=cF0>.base], </span><span class=cFC>EAX</span><span class=cF0>
<a name="l336"></a> </span><span class=cF1>LGDT</span><span class=cF0> </span><span class=cF9>U32</span><span class=cF0> [</span><span class=cFD>SYS_GDT_PTR</span><span class=cF0>]
<a name="l337"></a>
<a name="l338"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>EAX</span><span class=cF0>, </span><span class=cF3>SYS_START_CR0</span><span class=cF0>
<a name="l339"></a> </span><span class=cF1>MOV_CR0_EAX</span><span class=cF0>
<a name="l340"></a>
<a name="l341"></a></span><span class=cF2>/* The assembler doesn't support far jumps so</span><span class=cF0>
<a name="l342"></a></span><span class=cF2>we hand code it.</span><span class=cF0> </span><span class=cF2>16-bit code is not important</span><span class=cF0>
<a name="l343"></a></span><span class=cF2>enough to fully implement in the assembler.</span><span class=cF0>
<a name="l344"></a>
<a name="l345"></a></span><span class=cF2>To complete the switch to 32-bit mode, we have to load</span><span class=cF0>
<a name="l346"></a></span><span class=cF2>the code segment with a far jump.</span><span class=cF0>
<a name="l347"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l348"></a> </span><span class=cF1>DU8</span><span class=cF0> </span><span class=cFE>0x66</span><span class=cF0>, </span><span class=cFE>0xEA</span><span class=cF0>; </span><span class=cF2>//JMP CGDT.boot_cs:CORE0_32BIT_INIT</span><span class=cF0>
<a name="l349"></a> </span><span class=cF1>DU32</span><span class=cF0> </span><span class=cFD>CORE0_32BIT_INIT</span><span class=cF0>;
<a name="l350"></a> </span><span class=cF1>DU16</span><span class=cF0> </span><span class=cF9>CGDT</span><span class=cF0>.boot_cs;
<a name="l351"></a>#</span><span class=cF1>assert</span><span class=cF0> $ + </span><span class=cFE>16</span><span class=cF0> &lt;= </span><span class=cFE>0xFFFF</span><span class=cF0>
<a name="l352"></a>}
</span></pre></body>
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