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| ; Copyright (c) 2008-2009, diamond |
| ; All rights reserved. |
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| ; Redistribution and use in source and binary forms, with or without |
| ; modification, are permitted provided that the following conditions are met: |
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| ; * Redistributions in binary form must reproduce the above copyright |
| ; notice, this list of conditions and the following disclaimer in the |
| ; documentation and/or other materials provided with the distribution. |
| ; * Neither the name of the <organization> nor the |
| ; names of its contributors may be used to endorse or promote products |
| ; derived from this software without specific prior written permission. |
| ; |
| ; THIS SOFTWARE IS PROVIDED BY Alexey Teplov aka <Lrz> ''AS IS'' AND ANY |
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| ;***************************************************************************** |
| |
| Ñïåöèôèêàöèÿ íà ïåðâè÷íûé çàãðóç÷èê KordOS. |
| Çàãðóç÷èê äîëæåí ïðåäîñòàâëÿòü ñëåäóþùèå ñåðâèñû: |
| 1. Ïðè çàãðóçêå êîìïüþòåðà, ïîëó÷èâ óïðàâëåíèå îò BIOS'à, çàãðóæàòü |
| ôàéë loader èç ïàïêè kord ïî àäðåñó 1000:0000. |
| Ðàçìåð ôàéëà loader íå ïðåâîñõîäèò 30000h = 192 Kb. |
| 2. Ïðè ýòîì óñòàíàâëèâàòü ñëåäóþùèå ðåãèñòðû: |
| ax èäåíòèôèöèðóåò óñòðîéñòâî: |
| al = òèï: |
| 'f' - ôëîïèê |
| 'h' - HDD |
| 'c' - CD/DVD |
| 'u' - USB ôëåøêà |
| '?' - íåèçâåñòíîå óñòðîéñòâî |
| ah = íîìåð óñòðîéñòâà (ñðåäè âñåõ óñòðîéñòâ ôèêñèðîâàííîãî òèïà) |
| bx = òèï ôàéëîâîé ñèñòåìû: |
| '12' = FAT12 |
| '16' = FAT16 |
| '32' = FAT32 |
| 'nt' = NTFS |
| 'is' = ISO-9660 |
| ds:si = far-óêàçàòåëü íà callback-ñåðâèñ |
| 3. Ïðåäîñòàâëÿòü callback-ñåðâèñ äëÿ âòîðè÷íîãî çàãðóç÷èêà - far-ïðîöåäóðó: |
| íà âõîäå: ax = çàïðàøèâàåìàÿ ôóíêöèÿ |
| íà âûõîäå: CF=1, åñëè ôóíêöèÿ íå ïîääåðæèâàåòñÿ; CF=0 èíà÷å |
| Çàãðóç÷èê ìîæåò ðàçðóøàòü âñå ðåãèñòðû, âêëþ÷àÿ ñåãìåíòíûå, |
| çà èñêëþ÷åíèåì ss è sp. |
| 4. Âñåãäà äîëæíà ïîääåðæèâàòüñÿ callback-ôóíêöèÿ 1: |
| íàçíà÷åíèå: ïðî÷èòàòü ôàéë, ðàñïîëîæåííûé íà çàãðóçî÷íîì óñòðîéñòâå |
| íà âõîäå: ax = 1, ds:di = óêàçàòåëü íà èíôîðìàöèîííóþ ñòðóêòóðó: |
| dw:dw far-óêàçàòåëü íà áóôåð, |
| ïåðâîå ñëîâî - ñìåùåíèå, âòîðîå - ñåãìåíò |
| dw ìàêñèìàëüíîå ÷èñëî 4Kb-áëîêîâ äëÿ ÷òåíèÿ (0x1000 áàéò) |
| äîëæíî áûòü íåíóëåâûì è ñòðîãî ìåíüøå 0x100 |
| ASCIIZ èìÿ ôàéëà â ôîðìàòå "<ïàïêà1>/<ïàïêà2>/<ôàéë>" |
| Åñëè èìÿ ôàéëà ñîäåðæèò ñèìâîëû èç ñòàðøåé ïîëîâèíû |
| ASCIIZ-òàáëèöû èëè íå ÿâëÿåòñÿ 8.3-èìåíåì (â ñìûñëå, îäíà èç êîìïîíåíò |
| èìåíè ôàéëà èìååò èìÿ äëèííåå 8 ñèìâîëîâ èëè ðàñøèðåíèå äëèííåå 3), |
| çàãðóç÷èê ìîæåò íå íàéòè òàêîé ôàéë, äàæå åñëè îí åñòü |
| (à ìîæåò è íàéòè). |
| íà âûõîäå: bx = ñòàòóñ: |
| 0 = óñïåøíî |
| 1 = ôàéë îêàçàëñÿ ñëèøêîì áîëüøèì, áóôåð çàïîëíåí öåëèêîì |
| è åñòü åù¸ äàííûå ôàéëà |
| 2 = ôàéë íå íàéäåí |
| 3 = ïðîèçîøëà îøèáêà ÷òåíèÿ |
| dx:ax = ðàçìåð ôàéëà èëè FFFF:FFFF, åñëè ôàéë íå íàéäåí |
| 5. Âñåãäà äîëæíà ïîääåðæèâàòüñÿ callback-ôóíêöèÿ 2: |
| íàçíà÷åíèå: ïðîäîëæèòü ÷òåíèå ôàéëà, ÷àñòè÷íî çàãðóæåííîãî ôóíêöèåé 1 |
| íà âõîäå: ax = 2, ds:di = óêàçàòåëü íà èíôîðìàöèîííóþ ñòðóêòóðó: |
| dw:dw far-óêàçàòåëü íà áóôåð, |
| ïåðâîå ñëîâî - ñìåùåíèå, âòîðîå - ñåãìåíò |
| dw ìàêñèìàëüíîå ÷èñëî 4Kb-áëîêîâ äëÿ ÷òåíèÿ (0x1000 áàéò) |
| äîëæíî áûòü íåíóëåâûì è ñòðîãî ìåíüøå 0x100 |
| íà âûõîäå: bx = ñòàòóñ: |
| 0 = óñïåøíî |
| 1 = ôàéë îêàçàëñÿ ñëèøêîì áîëüøèì, áóôåð çàïîëíåí öåëèêîì |
| è åñòü åù¸ äàííûå ôàéëà |
| 3 = ïðîèçîøëà îøèáêà ÷òåíèÿ |
| dx:ax = ðàçìåð ôàéëà |
| Ôóíêöèþ ìîæíî âûçûâàòü òîëüêî â ñëó÷àå, êîãäà ïîñëåäíèé âûçîâ ôóíêöèè |
| 1 è âñå ïîñëåäóþùèå âûçîâû ôóíêöèè 2 âåðíóëè bx=1 (èíûìè ñëîâàìè, |
| òîëüêî äëÿ ïðîäîëæåíèÿ çàãðóçêè ôàéëà, êîòîðûé óæå áûë ÷àñòè÷íî |
| çàãðóæåí, íî åù¸ íå çàãðóæåí ïîëíîñòüþ). |
| Çàãðóç÷èê ìîæåò áûòü óâåðåí, ÷òî äàííûå â îáëàñòÿõ ïàìÿòè 0-9000 è |
| 60000-A0000 íå áóäóò ìîäèôèöèðîâàíû ÿäðîì. |