92 lines
4.4 KiB
Plaintext
92 lines
4.4 KiB
Plaintext
; Copyright (c) 2008-2009, diamond
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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; * Neither the name of the <organization> nor the
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; names of its contributors may be used to endorse or promote products
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; derived from this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY Alexey Teplov aka <Lrz> ''AS IS'' AND ANY
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; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
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; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;*****************************************************************************
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Ñïåöèôèêàöèÿ íà ïåðâè÷íûé çàãðóç÷èê KordOS.
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Çàãðóç÷èê äîëæåí ïðåäîñòàâëÿòü ñëåäóþùèå ñåðâèñû:
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1. Ïðè çàãðóçêå êîìïüþòåðà, ïîëó÷èâ óïðàâëåíèå îò BIOS'à, çàãðóæàòü
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ôàéë loader èç ïàïêè kord ïî àäðåñó 1000:0000.
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Ðàçìåð ôàéëà loader íå ïðåâîñõîäèò 30000h = 192 Kb.
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2. Ïðè ýòîì óñòàíàâëèâàòü ñëåäóþùèå ðåãèñòðû:
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ax èäåíòèôèöèðóåò óñòðîéñòâî:
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al = òèï:
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'f' - ôëîïèê
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'h' - HDD
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'c' - CD/DVD
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'u' - USB ôëåøêà
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'?' - íåèçâåñòíîå óñòðîéñòâî
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ah = íîìåð óñòðîéñòâà (ñðåäè âñåõ óñòðîéñòâ ôèêñèðîâàííîãî òèïà)
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bx = òèï ôàéëîâîé ñèñòåìû:
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'12' = FAT12
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'16' = FAT16
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'32' = FAT32
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'nt' = NTFS
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'is' = ISO-9660
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ds:si = far-óêàçàòåëü íà callback-ñåðâèñ
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3. Ïðåäîñòàâëÿòü callback-ñåðâèñ äëÿ âòîðè÷íîãî çàãðóç÷èêà - far-ïðîöåäóðó:
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íà âõîäå: ax = çàïðàøèâàåìàÿ ôóíêöèÿ
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íà âûõîäå: CF=1, åñëè ôóíêöèÿ íå ïîääåðæèâàåòñÿ; CF=0 èíà÷å
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Çàãðóç÷èê ìîæåò ðàçðóøàòü âñå ðåãèñòðû, âêëþ÷àÿ ñåãìåíòíûå,
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çà èñêëþ÷åíèåì ss è sp.
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4. Âñåãäà äîëæíà ïîääåðæèâàòüñÿ callback-ôóíêöèÿ 1:
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íàçíà÷åíèå: ïðî÷èòàòü ôàéë, ðàñïîëîæåííûé íà çàãðóçî÷íîì óñòðîéñòâå
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íà âõîäå: ax = 1, ds:di = óêàçàòåëü íà èíôîðìàöèîííóþ ñòðóêòóðó:
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dw:dw far-óêàçàòåëü íà áóôåð,
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ïåðâîå ñëîâî - ñìåùåíèå, âòîðîå - ñåãìåíò
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dw ìàêñèìàëüíîå ÷èñëî 4Kb-áëîêîâ äëÿ ÷òåíèÿ (0x1000 áàéò)
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äîëæíî áûòü íåíóëåâûì è ñòðîãî ìåíüøå 0x100
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ASCIIZ èìÿ ôàéëà â ôîðìàòå "<ïàïêà1>/<ïàïêà2>/<ôàéë>"
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Åñëè èìÿ ôàéëà ñîäåðæèò ñèìâîëû èç ñòàðøåé ïîëîâèíû
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ASCIIZ-òàáëèöû èëè íå ÿâëÿåòñÿ 8.3-èìåíåì (â ñìûñëå, îäíà èç êîìïîíåíò
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èìåíè ôàéëà èìååò èìÿ äëèííåå 8 ñèìâîëîâ èëè ðàñøèðåíèå äëèííåå 3),
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çàãðóç÷èê ìîæåò íå íàéòè òàêîé ôàéë, äàæå åñëè îí åñòü
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(à ìîæåò è íàéòè).
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íà âûõîäå: bx = ñòàòóñ:
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0 = óñïåøíî
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1 = ôàéë îêàçàëñÿ ñëèøêîì áîëüøèì, áóôåð çàïîëíåí öåëèêîì
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è åñòü åù¸ äàííûå ôàéëà
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2 = ôàéë íå íàéäåí
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3 = ïðîèçîøëà îøèáêà ÷òåíèÿ
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dx:ax = ðàçìåð ôàéëà èëè FFFF:FFFF, åñëè ôàéë íå íàéäåí
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5. Âñåãäà äîëæíà ïîääåðæèâàòüñÿ callback-ôóíêöèÿ 2:
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íàçíà÷åíèå: ïðîäîëæèòü ÷òåíèå ôàéëà, ÷àñòè÷íî çàãðóæåííîãî ôóíêöèåé 1
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íà âõîäå: ax = 2, ds:di = óêàçàòåëü íà èíôîðìàöèîííóþ ñòðóêòóðó:
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dw:dw far-óêàçàòåëü íà áóôåð,
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ïåðâîå ñëîâî - ñìåùåíèå, âòîðîå - ñåãìåíò
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dw ìàêñèìàëüíîå ÷èñëî 4Kb-áëîêîâ äëÿ ÷òåíèÿ (0x1000 áàéò)
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äîëæíî áûòü íåíóëåâûì è ñòðîãî ìåíüøå 0x100
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íà âûõîäå: bx = ñòàòóñ:
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0 = óñïåøíî
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1 = ôàéë îêàçàëñÿ ñëèøêîì áîëüøèì, áóôåð çàïîëíåí öåëèêîì
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è åñòü åù¸ äàííûå ôàéëà
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3 = ïðîèçîøëà îøèáêà ÷òåíèÿ
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dx:ax = ðàçìåð ôàéëà
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Ôóíêöèþ ìîæíî âûçûâàòü òîëüêî â ñëó÷àå, êîãäà ïîñëåäíèé âûçîâ ôóíêöèè
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1 è âñå ïîñëåäóþùèå âûçîâû ôóíêöèè 2 âåðíóëè bx=1 (èíûìè ñëîâàìè,
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òîëüêî äëÿ ïðîäîëæåíèÿ çàãðóçêè ôàéëà, êîòîðûé óæå áûë ÷àñòè÷íî
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çàãðóæåí, íî åù¸ íå çàãðóæåí ïîëíîñòüþ).
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Çàãðóç÷èê ìîæåò áûòü óâåðåí, ÷òî äàííûå â îáëàñòÿõ ïàìÿòè 0-9000 è
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60000-A0000 íå áóäóò ìîäèôèöèðîâàíû ÿäðîì.
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