Unit Instance

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        "Next, the real-mode <acronym>IVT</acronym> (Interrupt Vector Table is updated. The <acronym>IVT</acronym> is an array of segment/offset pairs for exception and interrupt handlers. The <acronym>BIOS</acronym> normally maps hardware interrupts to interrupt vectors <literal>0x8</literal> to <literal>0xf</literal> and <literal>0x70</literal> to <literal>0x77</literal> but, as will be seen, the 8259A Programmable Interrupt Controller, the chip controlling the actual mapping of hardware interrupts to interrupt vectors, is programmed to remap these interrupt vectors from <literal>0x8-0xf</literal> to <literal>0x20-0x27</literal> and from <literal>0x70-0x77</literal> to <literal>0x28-0x2f</literal>. Thus, interrupt handlers are provided for interrupt vectors <literal>0x20-0x2f</literal>. The reason the <acronym>BIOS</acronym>-provided handlers are not used directly is because they work in 16-bit real mode, but not 32-bit protected mode. Processor mode will be switched to 32-bit protected mode shortly. However, the <acronym>BTX</acronym> server sets up a mechanism to effectively use the handlers provided by the <acronym>BIOS</acronym>:"
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        "Next, the real-mode <acronym>IVT</acronym> (Interrupt Vector Table is updated. The <acronym>IVT</acronym> is an array of segment/offset pairs for exception and interrupt handlers. The <acronym>BIOS</acronym> normally maps hardware interrupts to interrupt vectors <literal>0x8</literal> to <literal>0xf</literal> and <literal>0x70</literal> to <literal>0x77</literal> but, as will be seen, the 8259A Programmable Interrupt Controller, the chip controlling the actual mapping of hardware interrupts to interrupt vectors, is programmed to remap these interrupt vectors from <literal>0x8-0xf</literal> to <literal>0x20-0x27</literal> and from <literal>0x70-0x77</literal> to <literal>0x28-0x2f</literal>. Thus, interrupt handlers are provided for interrupt vectors <literal>0x20-0x2f</literal>. The reason the <acronym>BIOS</acronym>-provided handlers are not used directly is because they work in 16-bit real mode, but not 32-bit protected mode. Processor mode will be switched to 32-bit protected mode shortly. However, the <acronym>BTX</acronym> server sets up a mechanism to effectively use the handlers provided by the <acronym>BIOS</acronym>:"
    ],
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    "context": "",
    "note": "(itstool) path: sect1/para",
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    "has_failing_check": false,
    "num_words": 134,
    "source_unit": "https://translate-dev.freebsd.org/api/units/102326/?format=api",
    "priority": 100,
    "id": 102326,
    "web_url": "https://translate-dev.freebsd.org/translate/freebsd-doc/boooks_arch-handbook/en/?checksum=b967bf8206be805b",
    "url": "https://translate-dev.freebsd.org/api/units/102326/?format=api",
    "explanation": "",
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    "pending": false,
    "timestamp": "2019-10-20T12:21:43.860770Z"
}