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https://github.com/Zeal-Operating-System/ZealOS.git
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1b75d91002
Add arg to SATARep to specify drive types to show. Add checks in AHCIPortInit to verify port signatures, add helper method to get signatures from port.
99 lines
7.6 KiB
HTML
Executable file
99 lines
7.6 KiB
HTML
Executable file
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<pre style="font-family:monospace;font-size:12pt">
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<a name="l1"></a><span class=cF5> Decisions Making ZealOS Simple
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<a name="l2"></a></span><span class=cF0>
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<a name="l3"></a>Linux is a semi-tractor -- you need professional drivers for 20 gears. Linux has file permissions. Common people are hurt by
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<a name="l4"></a>file permissions.
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<a name="l5"></a>
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<a name="l6"></a>Windows is a car.
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<a name="l7"></a>
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<a name="l8"></a>ZealOS is a motorcycle -- if you lean-over too far, a motorcycle will crash. Don't do that! There are no side air bags on
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<a name="l9"></a>a motorcycle. DOS and C64 had no memory protections and ran in ring-0, with no security. This saves an order of magnitude
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<a name="l10"></a>complexity.
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<a name="l11"></a>
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<a name="l12"></a>Linux and Windows are general purpose operating systems. They attempt to do any task you want. ZealOS cherry-picks tasks
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<a name="l13"></a>and is designed to do the same things a C64 did. This saves and order of magnitude complexity. For example, the </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/RedSea.DD.html#l1"><span class=cF4>RedSea</span></a><span class=cF0> file
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<a name="l14"></a>system allocates just contiguous files -- you load and save whole files at once. A benefit is this allows compression.
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<a name="l15"></a>Also, ZealOS does not do multimedia. In theory, memory will fragment with lots of big files. The system would fall to
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<a name="l16"></a>pieces with multimedia.
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<a name="l17"></a>
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<a name="l18"></a>A three bttn mouse is like a leg you cannot put weight on. ZealOS just does hardware everybody has, with no divergent code
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<a name="l19"></a>bases for each machine's custom hardware. There is one graphics driver instead of 50 for different GPUs. This saves an order
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<a name="l20"></a>of magnitude complexity and makes for a delightful API, so developer's code is not like a frayed rope end.
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<a name="l21"></a>
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<a name="l22"></a>
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<a name="l23"></a>
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<a name="l24"></a>* Everything runs in kernel, </span><span class=cF2>ring 0</span><span class=cF0>, mode.
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<a name="l25"></a>
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<a name="l26"></a>* </span><span class=cF2>One memory map</span><span class=cF0> for all tasks on all cores with virtual addresses set equal to physical, just as though paging is not used.
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<a name="l27"></a>
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<a name="l28"></a>* One platform -- </span><a href="http://en.wikipedia.org/wiki/Amd64#AMD64"><span class=cF4>x86_64</span></a><span class=cF0> PC's, no 32-bit support.
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<a name="l29"></a>
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<a name="l30"></a>* No security or cryptography.
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<a name="l31"></a>
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<a name="l32"></a>* Least (greatest) common denominator hardware support. Mostly, one driver for each device class. We can't be in the
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<a name="l33"></a>business of different drivers. Compatibility is the greatest challenge for PC operating systems. Disk code does not use
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<a name="l34"></a>interrupts, avoiding compatibility risks. </span><span class=cF2>PS/2</span><span class=cF0> keyboard/mouse is used instead of </span><span class=cF2>USB</span><span class=cF0>, also more compatible.
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<a name="l35"></a>
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<a name="l36"></a>* Updates whole screen at </span><span class=cF2>60 fps</span><span class=cF0>, optimized for full screen games where </span><span class=cF2>InvalidRectangle</span><span class=cF0>s are counter-productive.
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<a name="l37"></a>
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<a name="l38"></a>* One font, 8x8. Text and graphic layers done in software with text normally on an 8x8 grid.
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<a name="l39"></a>
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<a name="l40"></a>* Compiler extends all values to 64-bit when fetched and does only 64-bit computations intermediately. Assembler has minimal
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<a name="l41"></a>16-bit support, good enough for compiling boot loaders.
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<a name="l42"></a>
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<a name="l43"></a>* No object files. Use </span><span class=cF2>JIT</span><span class=cF0>.
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<a name="l44"></a>
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<a name="l45"></a>* Whole files are processed almost exclusively.
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<a name="l46"></a>
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<a name="l47"></a>* </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/CosmiC.DD.html#l1"><span class=cF4>One language</span></a><span class=cF0> and compiler for command-line, scripts, songs, automations and code.
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<a name="l48"></a>
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<a name="l49"></a>* One editor/word processor/browser for the command-line window, source code, documentation browser, dialog forms.
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<a name="l50"></a>
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<a name="l51"></a>* No child windows. One window per task. Bttns are widgets, not child windows. There are child tasks, however.
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<a name="l52"></a>
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<a name="l53"></a>* No distinction between </span><span class=cF2>thread</span><span class=cF0>, </span><span class=cF2>process</span><span class=cF0> or </span><span class=cF2>task</span><span class=cF0>.
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<a name="l54"></a>
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<a name="l55"></a>* The </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/Sched.CC.html#l1"><span class=cF4>Scheduler</span></a><span class=cF0> is for home systems. It is not preemptiove. Disk requests are not broken-up, so sharing is bad. It's
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<a name="l56"></a>wonderfully simple.
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<a name="l57"></a>
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<a name="l58"></a>* </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/MultiCore.DD.html#l1"><span class=cF4>MultiCore</span></a><span class=cF0> is done </span><span class=cF2>master/slave</span><span class=cF0>, instead of </span><span class=cF2>SMP</span><span class=cF0>. </span><span class=cF2>Core0</span><span class=cF0> applications explicitly assigns jobs. Locks are present allowing
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<a name="l59"></a>multicore file, heap, and hardware access, though.
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<a name="l60"></a>
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<a name="l61"></a>* </span><span class=cF4><u>Sound</u></span><span class=cF0> has single-voice 8-bit signed MIDI-like samples.
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<a name="l62"></a>
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<a name="l63"></a>* All tasks have a heap and a sym table. Scope is that of environment vars in other operating systems. As text is typed at
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<a name="l64"></a>the command line or you run programs by </span><span class=cF2>#include</span><span class=cF0>ing them, the syms go in the table. If a sym is not found, the parent task's
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<a name="l65"></a>table is checked. The father of all tasks has the API syms you'll need waiting in it's table. No need to </span><span class=cF2>#include</span><span class=cF0> headers.
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<a name="l66"></a>
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<a name="l67"></a>* No need for namespaces -- scoping occurs automatically based on task symbol table hierarchy with the </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/Glossary.DD.html#l154"><span class=cF4>System Task</span></a><span class=cF0>'s symbol
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<a name="l68"></a>system-wide global.
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<a name="l69"></a>
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<a name="l70"></a>* Sometimes, we </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/CutCorners.DD.html#l1"><span class=cF4>cut corners</span></a><span class=cF0> in the interest of keeping the code beautiful.
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</span></pre></body>
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