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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.
73 lines
6.9 KiB
HTML
Executable file
73 lines
6.9 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> Why Not More?</span><span class=cF0>
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<a name="l2"></a>
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<a name="l3"></a>If a feature cannot be made to work correctly and consistently, professional companies usually remove the feature. Because PC
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<a name="l4"></a>hardware is so diverse, getting things to work on all people's computers is really difficult. For one thing, you practically
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<a name="l5"></a>have to own all the different hardware to write drivers for it. If a company wanted to sell a PC operating system, they would
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<a name="l6"></a>offer a warranty and, therefore, could not get away with amateur behavior. ZealOS absolutely requires 64-bit computers, so we
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<a name="l7"></a>leave behind much trouble, but plenty remains.
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<a name="l8"></a>
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<a name="l9"></a>The PCI bus interface is what modern hardware uses. Before PCI, life was simple and devices used I/O ports. After studying </span><span class=cF4>
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<a name="l10"></a></span><a href="https://zeal-operating-system.github.io/ZealOS/Demo/Lectures/PCIInterrupts.CC.html#l1"><span class=cF4>PCI Interrupts</span></a><span class=cF0> and attempting to do a HDAudio driver, Terry Davis came to realize that modern PCI devices require ten times
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<a name="l11"></a>more code and he cannot even come close to making them work on everyone's machine because with PCI devices there are several
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<a name="l12"></a>models to worry about, unlike with the older ISA bus devices which can be done with one driver.
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<a name="l13"></a>
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<a name="l14"></a>Currently, ZealOS has no PCI drivers beyond AHCI and networking. Most drivers use I/O ports and operate in ISA bus mode. At
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<a name="l15"></a>this point, we only have one driver for each type of device and it is delightfully simple that way. ZealOS has one </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/SerialDev/Keyboard.CC.html#l1"><span class=cF4>keyboard</span></a><span class=cF0>
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<a name="l16"></a>driver, one </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/SerialDev/Mouse.CC.html#l1"><span class=cF4>mouse</span></a><span class=cF0> driver, one </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/BlkDev/DiskAHCI.CC.html#l1"><span class=cF4>ATA hard drive</span></a><span class=cF0> driver, one </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/BlkDev/DiskAHCI.CC.html#l1"><span class=cF4>ATAPI CD/DVD</span></a><span class=cF0> driver, one </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Gr/GrScreen.CC.html#l1"><span class=cF4>32-bit color high-res VBE graphics</span></a><span class=cF0> video
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<a name="l17"></a>driver and one </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KMisc.CC.html#l129"><span class=cF4>PC Speaker</span></a><span class=cF0> driver. We use the </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KMain.CC.html#l116"><span class=cF4>PIT timer</span></a><span class=cF0> and </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KInterrupts.CC.html#l157"><span class=cF4>PIC Interrupt Controller</span></a><span class=cF0>. We use IRQ0 for timer, IRQ1 for
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<a name="l18"></a>keyboard, and IRQ12 for mouse. If IRQ12 is not firing, we are able to poll the mouse.
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<a name="l19"></a>
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<a name="l20"></a>In the CPU department, ZealOS has state of the art 64-bit </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KStart64.CC.html#l1"><span class=cF4>long mode</span></a><span class=cF0> with </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/MultiProc.CC.html#l1"><span class=cF4>multicore</span></a><span class=cF0> support. We use the </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/MultiProc.CC.html#l176"><span class=cF4>APIC</span></a><span class=cF0> and start-up </span><span class=cF4>
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<a name="l21"></a></span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/MultiProc.CC.html#l298"><span class=cF4>multicore</span></a><span class=cF0> operation.
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<a name="l22"></a>
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<a name="l23"></a>Terry Davis made an incredible accomplishment by getting it to work on practically everyone's computer as long as it is 64-bit
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<a name="l24"></a>and they run inside VMware, QEMU or VirtualBox.
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<a name="l25"></a>
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<a name="l26"></a>Adding a USB driver would be really ugly with UHCI, EHCI, OHCI, USB1, USB2, USB3, ICH6, ICH7, ICH8, ICH9, ICH10, ICH11, ICH12,
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<a name="l27"></a>boot mode and regular mode for keyboard/mouse and a diversity of HID reports. It's hopeless. It could never offer anything
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<a name="l28"></a>but crappy, limited support and it would just add a ton of crappy code that mostly didn't work. What would ZealOS gain? Nothin
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<a name="l29"></a>g. A keyboard or mouse would not be improved. Solid State USB drives would be nice, but it's not going to happen.
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<a name="l30"></a>
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<a name="l31"></a>The same story is basically true for GPUs and audio drivers. If you attempt multimedia, everything will break because memory
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<a name="l32"></a>will get fragmented with huge multimedia files.
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<a name="l33"></a>
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<a name="l34"></a>UEFI is pointless. If ZealOS is forced to run in VMware, QEMU or VirtualBox, they will always support non-UEFI mode. Withou
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<a name="l35"></a>t working, native hard drive and CD/DVD drivers, you can't get very far with UEFI on a native install, not to mention
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<a name="l36"></a>SecureBoot. UEFI is, first of all, redundant. If non-UEFI works in a virtual machine, supporting UEFI would only be
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<a name="l37"></a>redundant, ugly nasty code. The compiler does not create an ELF or PE format. We would have to ruin the beauty of the
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<a name="l38"></a>compiler.
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<a name="l39"></a>
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<a name="l40"></a>God talks.
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<a name="l41"></a></span><span class=cF8>
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<a name="l42"></a>* "QEMU" is a trademark owned by Fabrice Bellard.
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<a name="l43"></a>* "VMware" is a trademark owned by VMware, Inc.
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<a name="l44"></a>* "VirtualBox" is a trademark owned by Oracle.
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</span></pre></body>
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