318 lines
11 KiB
NASM
318 lines
11 KiB
NASM
; Copyright (c) 2008-2009, <Lrz>
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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 nickname <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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;start of the project 13.02.2008 year.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;Secondary Loader copyright Alexey Teplov nickname <Lrz>
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;if you need log preproc
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;/////////////
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;include 'listing.inc'
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;enable listing
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;////////////
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;start of code: ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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use16
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org 0x0
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jmp start
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include 'sl_equ.inc' ; в файле размещены все equ предопределения
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include 'boot_st.inc'
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include 'debug_msg.inc' ;here is message from debug
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include 'parse_dat.inc'
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include 'sl_proc.inc'
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include 'parse.inc'
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include 'parse_loader.inc'
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include 'parse_any.inc'
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include 'parse_def_sect.inc'
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include 'parse_err.inc'
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file_data dw 0x0,ini_data_ ;формат: смещение: сегмент т.к. используется les
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size_data dw 16 ;16 блоков по 4 кб т.е предел до 64 кб
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name_ini_f db 'kord/startos.ini',0
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;////////////
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loader_callback dd ?
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load_drive dw ?
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load_ft dw ?
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;Start code
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start:
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; Save far pointer to callback procedure, ds:si is point
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mov word [cs:loader_callback], si
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mov word [cs:loader_callback+2], ds
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; Save type of drive
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mov word [cs:load_drive], ax
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; Save type of FT
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mov word [cs:load_ft], bx
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; set up stack
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mov ax, cs
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mov ss, ax
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xor sp, sp
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; set up segment registers
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mov ds, ax
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mov es, ax
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; just to be sure: force DF=0, IF=1
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cld
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sti
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; set videomode
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mov ax, 3
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int 0x10
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mov si, version
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call printplain
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mov al, '#'
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mov cx, 80
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;input cx=size al=char будет вывден символ сколько раз указано в cx
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@@:
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call putchar
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loop @b
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if DEBUG
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pushad
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mov ax, cs
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shl eax, 4 ; в десятичной системе адрес сегмента
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mov cx, 0xa
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mov di, cseg_msg
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call decode
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;***************
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mov si, cseg_msg
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call printplain
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popad
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end if
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if DEBUG
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mov si, stack_msg
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call printplain
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end if
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; Require 586 or higher processor (cpuid and rdtsc,rdmsr/wrmsr commands)
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; install int 6 (#UD) handler
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xor bx, bx
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mov ds, bx
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push word [bx+6*4+2]
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push word [bx+6*4]
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mov word [bx+6*4], ud16
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mov word [bx+6*4+2], cs
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; issue CPUID command
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xor eax, eax ; N.B.: will cause #UD before 386
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cpuid ; N.B.: will cause #UD before later 486s
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test eax, eax
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jz cpubad
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; get processor features
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xor eax, eax
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inc ax
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cpuid
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test dl, 10h ; CPUID[1].edx[4] - TSC support
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jz cpubad
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test dl, 20h ; CPUID[1].edx[5] - MSR support
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jnz cpugood
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ud16: ; #UD handler, called if processor did not recognize some commands
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cpubad:
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; restore int 6 (#UD) handler
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pop word [6*4]
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pop word [6*4+2]
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; say error
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push cs
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pop ds
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mov si, badprocessor
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sayerr:
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call printplain
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jmp $
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cpugood:
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; restore int 6 (#UD) handler
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pop dword [6*4]
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push cs
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pop ds
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; set up esp
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movzx esp, sp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; init memory
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Load startos.ini
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mov cx, loop_read_startos_file ;кол-во попыток чтения файла конфигурации startos.ini
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align 4
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Load startos.ini ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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load_startos_file:
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xor ax, ax
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mov di, file_data
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inc ax ;function 1 - read file
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push cx
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call far dword [loader_callback]
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pop cx
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push cs
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push cs
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pop ds
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pop es
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test bx, bx
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jz check_conf_file
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dec cx
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jnz load_startos_file
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;SET DEFAULT Not use ini file
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error_ini:
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mov si, error_ini_f1 ;Error: cannot load ini file, buffer is full
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dec bx
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jz err_show_ini
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mov si, error_ini_f2 ;Error: ini file not found
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dec bx
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jz err_show_ini
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mov si, error_ini_f3 ;Error: cannot read ini file
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dec bx
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jz err_show_ini
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mov si, error_ini_nf ;Error: unrecognized error when loading ini file
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err_show_ini:
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call printplain
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mov si, error_ini_common
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call printplain
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; wait for keypress
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xor ax, ax
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int 16h
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ini_loaded:
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jmp $
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align 4
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check_conf_file:
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;Check config file in current dir
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push ax ;save size file
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if DEBUG
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mov cx, 0x0a
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mov di, show_decode
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call decode
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;Show size
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mov si, show_string
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call printplain
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end if
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;Show message
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mov si, load_ini
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call printplain
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pop cx ;restore size file
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use_parse ;parsing startos.ini
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;
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jmp ini_loaded
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;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;DATA
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;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; table for move to extended memory (int 15h, ah=87h)
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align 4
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table_15_87:
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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db 0xff,0xff
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db 0x0,0x10
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db 0x00,0x93,0x0,0x0
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db 0xff,0xff,0x0,0x00,0x10,0x93,0x0,0x0
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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db 0x00,0x00,0x0,0x00,0x00,0x00,0x0,0x0
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fat12_buffer:
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.BS_jmpBoot db 0x90,0x90,0x90 ;3 байта NOP инструкция - ничего не делать
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.BS_OEMName db 'K SyS 64' ;8 байт
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.BPB_BytsPerSec dw 512 ;кол-во байтов в секторе может быть любое 512 1024 2048 4096 2 байта
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.BPB_SecPerClus db 0x1 ;кол-во секторов в кластере
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.BPB_RsvdSecCnt dw 0x1 ;для FAt12/16 только 1, для FAT32 обычно 32
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.BPB_NumFATs db 0x1 ;кол-во фат таблиц, на тот случай если будет сброс на дискету образа рам диска
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.BPB_RootEntCnt dw 512 ;для мак совместимости с fat16
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.BPB_TotSec16 dw 0x0 ;кл-во секторов
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.BPB_Media db 0xF0
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.BPB_FATSz16 dw 0x0
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.BPB_SecPerTrk dw 0x0 ;содержит геометрию диска для RAMFS на как бы без разницы, пока пустое поле, позже внести реальные значения.
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.BPB_NumHeads dw 0x0
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.BPB_HiddSec dd 0x0 ;кол-во скрытых секторов
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.BPB_TotSec32 dd 0x0
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.BS_DrvNum db 'R' ;от слова RAM
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.BS_Reserved1 db 0x0
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.BS_BootSig db 0x29
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.BS_VolID db 'RFKS'
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.BS_VolLab db 'RAM DISK FS' ;11 символов
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.BS_FilSysType db 'FAT12 ' ;8 символов
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;62 байта структура fat12.
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db (512-($-fat12_buffer))dup(0x90)
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;структура для дирректории fat
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struc FAT_32_entry ;Byte Directory Entry Structure
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{
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.DIR_Name rb 11
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.DIR_Attr db ?
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.DIR_NTRes db ?
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.DIR_CrtTimeTenth db ?
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.DIR_CrtTime dw ?
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.DIR_CrtDate dw ?
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.DIR_LstAccDate dw ?
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.DIR_FstClusHI dw ?
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.DIR_WrtTime dw ?
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.DIR_WrtDate dw ?
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.DIR_FstClusLO dw ?
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.DIR_FileSize dd ?
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}
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;Тут будут распологатсья данные, которые затруднительно распологать в стековой области....
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;;;
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;timer
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shot_name_fat rb 11 ;временный буфер для fat12, в нем храняться имена файлов приведенные к правилам FAT /* вдальнейшем перенести в стэк
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if DEBUG
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rb 1 ;нужен для отладки и вывода имени файла после преобразования
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dest_name_fat db 24 dup('_');12
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db 0x0
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end if
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value_timeout rw 1 ;value to timeout
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old_timer rd 1 ;старое значение вектора таймера
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start_timer rd 1 ;значение таймера
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timer_ rd 1 ;новое значение вектора таймера т.е. SL
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start_stack rw 1 ;save stack
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save_bp_from_timer rw 1 ;save bp from timer
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