forked from KolibriOS/kolibrios
8f992ed021
git-svn-id: svn://kolibrios.org@1635 a494cfbc-eb01-0410-851d-a64ba20cac60
92 lines
4.4 KiB
Plaintext
92 lines
4.4 KiB
Plaintext
; Copyright (c) 2008-2009, diamond
|
|
; All rights reserved.
|
|
;
|
|
; Redistribution and use in source and binary forms, with or without
|
|
; modification, are permitted provided that the following conditions are met:
|
|
; * Redistributions of source code must retain the above copyright
|
|
; notice, this list of conditions and the following disclaimer.
|
|
; * 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
|
|
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
; DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
|
|
; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
;*****************************************************************************
|
|
|
|
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.
|