Unit Instance

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{
    "translation": "https://translate-dev.freebsd.org/api/translations/documentation/booksarch-handbookboot_index/en/?format=api",
    "source": [
        "As [.filename]#boot0# is loaded by the BIOS to address `0x7C00`, it copies itself to address `0x600` and then transfers control there (recall that it was linked to execute at address `0x600`).  The source address, `0x7c00`, is copied to register `%si`.  The destination address, `0x600`, to register `%di`.  The number of words to copy, `256` (the program's size = 512 bytes), is copied to register `%cx`.  Next, the `rep` instruction repeats the instruction that follows, that is, `movsw`, the number of times dictated by the `%cx` register.The `movsw` instruction copies the word pointed to by `%si` to the address pointed to by `%di`.  This is repeated another 255 times.  On each repetition, both the source and destination registers, `%si` and `%di`, are incremented by one.  Thus, upon completion of the 256-word (512-byte) copy, `%di` has the value `0x600`+`512`= `0x800`, and `%si` has the value `0x7c00`+`512`= `0x7e00`; we have thus completed the code _relocation_.  Since the last update of this document, the copy instructions have changed in the code, so instead of the movsb and stosb, movsw and stosw have been introduced, which copy 2 bytes(1 word) in one iteration."
    ],
    "previous_source": "",
    "target": [
        "As [.filename]#boot0# is loaded by the BIOS to address `0x7C00`, it copies itself to address `0x600` and then transfers control there (recall that it was linked to execute at address `0x600`).  The source address, `0x7c00`, is copied to register `%si`.  The destination address, `0x600`, to register `%di`.  The number of words to copy, `256` (the program's size = 512 bytes), is copied to register `%cx`.  Next, the `rep` instruction repeats the instruction that follows, that is, `movsw`, the number of times dictated by the `%cx` register.The `movsw` instruction copies the word pointed to by `%si` to the address pointed to by `%di`.  This is repeated another 255 times.  On each repetition, both the source and destination registers, `%si` and `%di`, are incremented by one.  Thus, upon completion of the 256-word (512-byte) copy, `%di` has the value `0x600`+`512`= `0x800`, and `%si` has the value `0x7c00`+`512`= `0x7e00`; we have thus completed the code _relocation_.  Since the last update of this document, the copy instructions have changed in the code, so instead of the movsb and stosb, movsw and stosw have been introduced, which copy 2 bytes(1 word) in one iteration."
    ],
    "id_hash": 5565268540495244488,
    "content_hash": 5565268540495244488,
    "location": "documentation/content/en/books/arch-handbook/boot/_index.adoc:291",
    "context": "",
    "note": "type: Plain text",
    "flags": "",
    "labels": [],
    "state": 100,
    "fuzzy": false,
    "translated": true,
    "approved": false,
    "position": 50,
    "has_suggestion": false,
    "has_comment": false,
    "has_failing_check": false,
    "num_words": 188,
    "source_unit": "https://translate-dev.freebsd.org/api/units/1436423/?format=api",
    "priority": 100,
    "id": 1436423,
    "web_url": "https://translate-dev.freebsd.org/translate/documentation/booksarch-handbookboot_index/en/?checksum=cd3bce4063e02cc8",
    "url": "https://translate-dev.freebsd.org/api/units/1436423/?format=api",
    "explanation": "",
    "extra_flags": "",
    "pending": false,
    "timestamp": "2022-07-08T02:58:53.758361Z"
}