forked from KolibriOS/kolibrios
674 lines
21 KiB
NASM
674 lines
21 KiB
NASM
; 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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org 0x7E00
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; the KordOS FAT32 bootsector loads first cluster of this file to 0:7E00 and transfers control to here
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; ss:bp = 0:7C00
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; ds = 0
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virtual at bp
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rb 3 ; BS_jmpBoot
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rb 8 ; BS_OEMName, ignored
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dw ? ; BPB_BytsPerSec
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BPB_SecsPerClus db ?
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BPB_RsvdSecCnt dw ?
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BPB_NumFATs db ?
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BPB_RootEntCnt dw ?
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dw ? ; BPB_TotSec16
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db ? ; BPB_Media
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dw ? ; BPB_FATSz16 = 0 for FAT32
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BPB_SecPerTrk dw ?
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BPB_NumHeads dw ?
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BPB_HiddSec dd ?
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dd ? ; BPB_TotSec32
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BPB_FATSz32 dd ?
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BPB_ExtFlags dw ?
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dw ? ; BPB_FSVer
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BPB_RootClus dd ?
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filesize:
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dw ? ; BPB_FSInfo
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dw ? ; BPB_BkBootSec
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rb 12 ; BPB_Reserved
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BS_DrvNum db ?
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db ? ; BS_Reserved1
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db ? ; BS_BootSig
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dd ? ; BS_VolID
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; rb 11 ; BS_VolLab
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; rb 5 ; BS_FilSysType, first 5 bytes
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read_sectors32 dw ?
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read_sectors2 dw ?
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err_ dw ?
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noloader dw ?
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cachelimit dw ?
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fatcachehead rw 2
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fatcacheend dw ?
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rb 3 ; BS_FilSysType, last 3 bytes
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curseg dw ?
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num_sectors dd ?
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cur_cluster dd ?
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next_cluster dd ?
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flags dw ?
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cur_delta dd ?
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end virtual
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; procedures from boot sector
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; LBA version
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lba_read_sectors2 = 7CD6h
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lba_err = 7CAAh
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lba_noloader = 7CA7h ; = lba_err - 3
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; CHS version
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chs_read_sectors2 = 7CD2h
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chs_err = 7CA6h
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chs_noloader = 7CA3h ; = chs_err - 3
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push eax cx ; save our position on disk
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; determine version of bootsector (LBA vs CHS)
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mov [read_sectors2], chs_read_sectors2
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mov bx, chs_err
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mov [err_], bx
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; mov [noloader], chs_noloader
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cmp byte [bx], 0xE8 ; [chs_err] = 0xE8 for CHS version, 0x14 for LBA version
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jz @f
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add [read_sectors2], lba_read_sectors2 - chs_read_sectors2
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add [err_], lba_err - chs_err
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; mov [noloader], lba_noloader
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@@:
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xor bx, bx
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; determine size of cache for folders
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int 12h ; ax = size of available base memory in Kb
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sub ax, 92000h / 1024
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jae @f
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nomem:
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mov si, nomem_str
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jmp [err_]
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@@:
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shr ax, 3
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mov [cachelimit], ax ; size of cache - 1
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mov es, bx
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; no folders in cache yet
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mov di, foldcache_clus
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mov cx, 8*4/2 + 1
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xor ax, ax
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rep stosw
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; bootsector code caches one FAT sector, [bp-14], in 6000:0000
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; initialize our (more advanced) FAT caching from this
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mov di, 8400h
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mov cx, di
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lea si, [fatcachehead]
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mov [si], si ; no sectors in cache:
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mov [si+2], si ; 'prev' & 'next' links point to self
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mov [fatcacheend], di ; first free item = 8400h
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stosw ; 'next cached sector' link
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stosw ; 'prev cached sector' link
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mov eax, [bp-14]
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stosd ; first sector number in cache
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test eax, eax
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js @f
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mov [si], cx ; 'first cached sector' link = 8400h
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mov [si+2], cx ; 'next cached sector' link = 8400h
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mov [fatcacheend], di ; first free item = 8406h
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@@:
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; if cluster = sector, we need to read second part of our file
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; (bootsector loads only first cluster of kordldr.f32)
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pop cx eax ; restore our position on disk
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cmp cx, 1
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ja kordldr_full
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sub eax, [bp-10]
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inc eax
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inc eax ; eax = first cluster of kordldr.f32
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call get_next_cluster
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jc @f
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; jmp [noloader]
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mov ax, [err_]
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sub ax, 3
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jmp ax
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@@:
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dec eax
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dec eax
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push 0x800
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pop es
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call [read_sectors2]
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kordldr_full:
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; bootsector code has read some data of root directory to 8000:0000
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; initialize our folder caching from this
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mov eax, [BPB_RootClus]
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mov [foldcache_clus], eax
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mov cx, [curseg]
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mov ax, 8000h
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sub cx, ax ; cx = size of data read in paragraphs (0x10 bytes)
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shr cx, 1 ; cx = size of folder data read in entries (0x20 bytes)
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mov [foldcache_size], cx
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shl cx, 4
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push ds
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mov ds, ax
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push 0x9000
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pop es
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xor si, si
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xor di, di
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rep movsw
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pop ds
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; ...continue loading...
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mov di, secondary_loader_info
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call load_file
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test bx, bx
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mov bx, [err_]
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jz @f
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mov si, aKernelNotFound
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jmp bx
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@@:
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; for subsequent calls to callback function, hook error handler
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; push hooked_err / ret
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mov dword [bx], 0x68 + (hooked_err shl 8) + (0xC3 shl 24)
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; set registers for secondary loader
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mov ah, [bp-2] ; drive id
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mov al, 'f'
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btr ax, 15
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jnc @f
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mov al, 'h'
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@@:
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mov bx, '32'
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mov si, callback
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jmp far [si+secondary_loader_info-callback]
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nomem_str db 'No memory',0
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cluster2sector:
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sub eax, 2
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clustersz2sectorsz:
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movzx ecx, [BPB_SecsPerClus]
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mul ecx
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ret
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get_next_cluster:
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; in: eax = cluster
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; out: if there is next cluster: CF=1, eax = next cluster
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; out: if there is no next cluster: CF=0
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push di bx
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push ds es
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push ss
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pop ds
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push ss
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pop es
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push ax
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shr eax, 7
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; eax = FAT sector number; look in cache
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mov di, 8400h
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.cache_lookup:
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cmp di, [fatcacheend]
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jae .not_in_cache
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scasd
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scasd
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jnz .cache_lookup
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.in_cache:
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sub di, 8
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; delete this sector from the list
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push si
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mov si, [di]
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mov bx, [di+2]
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mov [si+2], bx
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mov [bx], si
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pop si
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jmp @f
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.not_in_cache:
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; cache miss
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; cache is full?
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mov di, [fatcacheend]
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cmp di, 8C00h
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jnz .cache_not_full
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; yes, delete the oldest entry
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mov di, [fatcachehead]
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mov bx, [di]
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mov [fatcachehead], bx
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push word [di+2]
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pop word [bx+2]
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jmp .cache_append
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.cache_not_full:
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; no, allocate new sector
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add [fatcacheend], 8
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.cache_append:
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; read FAT
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mov [di+4], eax
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pushad
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lea cx, [di + 0x10000 - 0x8400 + (0x6000 shr (9-4-3))] ; +0x10000 - for FASM
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shl cx, 9-4-3
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mov es, cx
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xor bx, bx
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mov cx, 1
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add eax, [bp-6] ; FAT start
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sub eax, [bp-10]
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call [read_sectors2]
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popad
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@@:
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; add new sector to the end of list
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mov bx, di
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xchg bx, [fatcachehead+2]
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push word [bx]
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pop word [di]
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mov [bx], di
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mov [di+2], bx
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; get requested item
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lea ax, [di + 0x10000 - 0x8400 + (0x6000 shr (9-4-3))]
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pop di
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and di, 0x7F
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shl di, 2
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shl ax, 9-4-3
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mov ds, ax
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and byte [di+3], 0x0F
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mov eax, [di]
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pop es ds
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pop bx di
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;and eax, 0x0FFFFFFF
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cmp eax, 0x0FFFFFF7
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ret
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if $ > 0x8000
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error 'get_next_cluster must fit in first sector of kordldr.f32!'
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end if
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load_file:
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; in: ss:bp = 0:7C00
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; in: ds:di -> information structure
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; dw:dw address
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; dw limit in 4Kb blocks (0x1000 bytes) (must be non-zero and not greater than 0x100)
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; ASCIIZ name
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; out: bx = status: bx=0 - ok, bx=1 - file is too big, only part of file was loaded, bx=2 - file not found
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; out: dx:ax = file size (0xFFFFFFFF if file not found)
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mov eax, [BPB_RootClus] ; start from root directory
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or dword [filesize], -1 ; initialize file size with invalid value
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lea si, [di+6]
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parse_dir_loop:
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; convert name to FAT name
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push di
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push ax
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push ss
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pop es
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; convert ASCIIZ filename to FAT name
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filename equ bp
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mov di, filename
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push di
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mov cx, 8+3
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mov al, ' '
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rep stosb
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pop di
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mov cl, 8 ; 8 symbols per name
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mov bl, 1
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nameloop:
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lodsb
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test al, al
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jz namedone
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cmp al, '/'
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jz namedone
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cmp al, '.'
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jz namedot
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dec cx
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js badname
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cmp al, 'a'
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jb @f
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cmp al, 'z'
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ja @f
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sub al, 'a'-'A'
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@@:
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stosb
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jmp nameloop
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namedot:
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inc bx
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jp badname
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add di, cx
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mov cl, 3
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jmp nameloop
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badname: ; do not make direct js/jp to notfound_pop:
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; this generates long forms of conditional jumps and results in longer code
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jmp notfound_pop
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namedone:
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; scan directory
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pop ax ; eax = cluster of directory
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; high word of eax is preserved by operations above
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push ds
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push si
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; read a folder sector-by-sector and scan
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; first, try to use the cache
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push ss
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pop ds
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mov di, foldcache_mark
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xor bx, bx
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mov cx, [cachelimit]
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@@:
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lea si, [di+bx]
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mov edx, dword [foldcache_clus+si-foldcache_mark+bx]
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cmp edx, eax
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jz cacheok
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test edx, edx
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jz cacheadd ; the cache has place for new entry
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inc bx
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inc bx
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dec cx
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jns @b
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; the folder is not present in the cache, so add it
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; the cache is full; find the oldest entry and replace it with the new one
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mov bx, -2
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mov dx, [cachelimit]
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@@:
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inc bx
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inc bx
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cmp word [di+bx], dx ; marks have values 0 through [cachelimit]
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jnz @b
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lea si, [di+bx]
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cacheadd:
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or word [di+bx], 0xFFFF ; very big value, it will be changed soon
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and [foldcache_size+di-foldcache_mark+bx], 0 ; no folder items yet
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mov dword [foldcache_clus+si-foldcache_mark+bx], eax
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cacheok:
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; update cache marks
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mov dx, [di+bx]
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mov cx, [foldcache_size+di-foldcache_mark+bx]
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mov di, [cachelimit]
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add di, di
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cacheupdate:
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cmp [foldcache_mark+di], dx
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adc [foldcache_mark+di], 0
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dec di
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dec di
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jns cacheupdate
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and [foldcache_mark+bx], 0
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; done, bx contains (position in cache)*2
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;mov dx, bx
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;shl dx, 8 ; dx = (position in cache)*0x2000/0x10
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;add dx, 0x9000
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lea dx, [bx + 0x90]
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xchg dl, dh
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mov ds, dx
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mov si, filename ; ss:si -> filename in FAT style
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call scan_for_filename
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jz lookup_done
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; cache miss, read folder data from disk
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mov bx, cx
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shr bx, 4
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shl cx, 5
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mov di, cx ; es:di -> free space in cache entry
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; external loop: scan clusters
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folder_next_cluster:
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; internal loop: scan sectors in cluster
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push eax
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call cluster2sector
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folder_next_sector:
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; skip first bx sectors
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dec bx
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jns folder_skip_sector
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push cx
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push es di
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push 0x8000
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pop es
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xor bx, bx
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mov cx, 1
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push es
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push eax
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call [read_sectors2]
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pop eax
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; copy data to the cache...
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pop ds
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pop di es
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cmp di, 0x2000 ; ...if there is free space, of course
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jae @f
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pusha
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mov cx, 0x100
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xor si, si
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rep movsw
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mov di, es
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shr di, 8
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add [ss:foldcache_size+di-0x90], 0x10 ; 0x10 new entries in the cache
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popa
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@@:
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push es
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mov cl, 0x10 ; ch=0 at this point
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call scan_for_filename
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pop es
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pop cx
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jz lookup_done_pop
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folder_skip_sector:
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inc eax
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loop folder_next_sector
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pop eax ; eax = current cluster
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call get_next_cluster
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jc folder_next_cluster
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stc
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push eax
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lookup_done_pop:
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pop eax
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lookup_done:
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pop si
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; CF=1 <=> failed
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jnc found
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pop ds
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notfound:
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pop di
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notfound2:
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mov bx, 2 ; file not found
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mov ax, 0xFFFF
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mov dx, ax ; invalid file size
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ret
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notfound_pop:
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pop ax
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jmp notfound
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found:
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mov eax, [di+20-2]
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mov edx, [di+28]
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mov ax, [di+26] ; get cluster
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test byte [di+11], 10h ; directory?
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pop ds
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pop di
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jz regular_file
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cmp byte [si-1], 0
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jz notfound2 ; don't read directories as regular files
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; ok, we have found a directory and the caller requested a file into it
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jmp parse_dir_loop ; restart with new cluster in ax
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regular_file:
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cmp byte [si-1], 0
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jnz notfound2 ; file does not contain another files
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; ok, we have found a regular file and the caller requested it
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; save file size
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mov [filesize], edx
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mov si, [di+4] ; [ds:di+4] = limit in 4K blocks
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shl si, 3
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push si
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les bx, [di] ; es:bx -> buffer
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clusloop:
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; eax = first cluster, top of stack contains limit in sectors
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mov esi, eax ; remember current cluster
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xor ecx, ecx ; ecx will contain number of consecutive clusters
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mov [cur_delta], ecx
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mov edi, eax
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clusfind:
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inc edi
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inc ecx
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call get_next_cluster
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jnc clusread
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cmp eax, edi
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jz clusfind
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stc
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clusread:
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pop di ; limit in sectors
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movzx edi, di
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push eax ; save next cluster
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pushf ; save flags
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; read cx clusters, starting from si
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; calculate number of sectors
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xchg eax, ecx
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call clustersz2sectorsz
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mov [num_sectors], eax
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jmp @f
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continue_load_file:
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les bx, [di] ; es:bx -> buffer
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movzx edi, word [di+4] ; di = limit in 4K blocks
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shl di, 3 ; now di = limit in sectors
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mov eax, [num_sectors]
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mov esi, [cur_cluster]
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push [next_cluster]
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push [flags]
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test eax, eax
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jz nextclus
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@@:
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; eax = number of sectors; compare with limit
|
|
cmp eax, edi
|
|
seta dl
|
|
push dx ; limit was exceeded?
|
|
jbe @f
|
|
mov eax, edi
|
|
@@:
|
|
sub di, ax ; calculate new limit
|
|
sub [num_sectors], eax
|
|
mov [cur_cluster], esi
|
|
; calculate starting sector
|
|
push ax
|
|
xchg eax, esi
|
|
call cluster2sector
|
|
pop cx
|
|
add eax, [cur_delta]
|
|
add [cur_delta], ecx
|
|
; read
|
|
call [read_sectors2]
|
|
pop dx
|
|
; next cluster?
|
|
nextclus:
|
|
popf
|
|
pop eax
|
|
mov [next_cluster], eax
|
|
pushf
|
|
pop [flags]
|
|
jnc @f ; no next cluster => return
|
|
mov dl, 1
|
|
test di, di
|
|
jz @f ; if there is next cluster but current limit is 0 => return: limit exceeded
|
|
push di
|
|
jmp clusloop ; all is ok, continue
|
|
hooked_err:
|
|
mov sp, 7C00h-14-2 ; restore stack
|
|
mov dl, 3 ; return: read error
|
|
@@:
|
|
mov bl, dl
|
|
mov bh, 0
|
|
mov ax, [filesize]
|
|
mov dx, [filesize+2]
|
|
ret
|
|
|
|
scan_for_filename:
|
|
; in: ss:si -> 11-bytes FAT name
|
|
; in: ds:0 -> part of directory data
|
|
; in: cx = number of entries
|
|
; in: bh = 0
|
|
; out: if found: CF=0, ZF=1, es:di -> directory entry
|
|
; out: if not found, but continue required: CF=1 and ZF=0
|
|
; out: if not found and zero item reached: CF=1 and ZF=1
|
|
push ds
|
|
pop es
|
|
xor di, di
|
|
push cx
|
|
jcxz snoent
|
|
sloop:
|
|
cmp byte [di], bh
|
|
jz snotfound
|
|
test byte [di+11], 8 ; volume label?
|
|
jnz scont ; ignore volume labels
|
|
pusha
|
|
mov cx, 11
|
|
repz cmps byte [ss:si], byte [es:di]
|
|
popa
|
|
jz sdone
|
|
scont:
|
|
add di, 0x20
|
|
loop sloop
|
|
snoent:
|
|
inc cx ; clear ZF flag
|
|
snotfound:
|
|
stc
|
|
sdone:
|
|
pop cx
|
|
lrdret:
|
|
ret
|
|
|
|
; Callback function for secondary loader
|
|
callback:
|
|
; in: ax = function number; only functions 1 and 2 are defined for now
|
|
; save caller's stack
|
|
mov dx, ss
|
|
mov cx, sp
|
|
; set our stack (required because we need ss=0)
|
|
xor si, si
|
|
mov ss, si
|
|
mov sp, 7C00h-10
|
|
mov bp, 7C00h
|
|
push dx
|
|
push cx
|
|
; call our function
|
|
stc ; unsupported function
|
|
dec ax
|
|
jz callback_readfile
|
|
dec ax
|
|
jnz callback_ret
|
|
; function 2: continue loading file
|
|
; can be called only after function 1 returned value bx=1 (only part of file was loaded)
|
|
; in: ds:di -> information structure
|
|
; dw:dw address
|
|
; dw limit in 4Kb blocks (0x1000 bytes) (must be non-zero and not greater than 0x100)
|
|
; out: bx=0 - ok, bx=1 - still only part of file was loaded, bx=3 - read error
|
|
; out: dx:ax = file size
|
|
call continue_load_file
|
|
jmp callback_ret_succ
|
|
callback_readfile:
|
|
; function 1: read file
|
|
; in: ds:di -> information structure
|
|
; dw:dw address
|
|
; dw limit in 4Kb blocks (0x1000 bytes) (must be non-zero and not greater than 0x100)
|
|
; ASCIIZ name
|
|
; out: bx=0 - ok, bx=1 - file is too big, only part of file was loaded, bx=2 - file not found, bx=3 - read error
|
|
; out: dx:ax = file size (0xFFFFFFFF if file was not found)
|
|
call load_file
|
|
callback_ret_succ:
|
|
clc ; function is supported
|
|
callback_ret:
|
|
; restore caller's stack
|
|
pop cx
|
|
pop ss
|
|
mov sp, cx
|
|
; return to caller
|
|
retf
|
|
|
|
secondary_loader_info:
|
|
dw 0, 0x1000
|
|
dw 0x30000 / 0x1000
|
|
db 'kernel.mnt',0
|
|
aKernelNotFound db 'Fatal error: cannot load the kernel',0
|
|
|
|
;if $ > 0x8200
|
|
;error 'total size of kordldr.f32 must not exceed 1024 bytes!'
|
|
;end if
|
|
|
|
;foldcache_clus dd 0,0,0,0,0,0,0,0 ; start with no folders in cache
|
|
;foldcache_mark dw 0
|
|
; rw 7
|
|
;foldcache_size rw 8
|
|
foldcache_clus rd 8
|
|
foldcache_mark rw 8
|
|
foldcache_size rw 8
|