forked from KolibriOS/kolibrios
953 lines
29 KiB
PHP
953 lines
29 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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;**********************************************************
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; Direct work with floppy disk drive
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;**********************************************************
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; Source code author - Kulakov Vladimir Gennadievich.
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; Adaptation and improvement - Mario79.
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give_back_application_data_1:
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mov esi, FDD_BUFF;FDD_DataBuffer ;0x40000
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mov ecx, 128
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cld
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rep movsd
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ret
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take_data_from_application_1:
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mov edi, FDD_BUFF;FDD_DataBuffer ;0x40000
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mov ecx, 128
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cld
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rep movsd
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ret
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; Controller operations result codes (FDC_Status)
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FDC_Normal = 0 ; normal finish
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FDC_TimeOut = 1 ; time out error
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FDC_DiskNotFound = 2 ; no disk in drive
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FDC_TrackNotFound = 3 ; track not found
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FDC_SectorNotFound = 4 ; sector not found
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; Maximum values of the sector coordinates (specified
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; values correspond to the parameters of the standard
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; 3-inch 1.44 MB floppy disk)
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MAX_Track = 79
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MAX_Head = 1
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MAX_Sector = 18
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uglobal
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; Timer tick counter
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TickCounter dd ?
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; Operation completion code with the floppy disk drive controller
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FDC_Status DB ?
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; Interrupt flag from floppy disk drive
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FDD_IntFlag DB ?
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; The moment of the beginning of the last operation with FDD
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FDD_Time DD ?
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; Drive number
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FDD_Type db 0
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; Sector coordinates
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FDD_Track DB ?
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FDD_Head DB ?
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FDD_Sector DB ?
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; Operation result block
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FDC_ST0 DB ?
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FDC_ST1 DB ?
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FDC_ST2 DB ?
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FDC_C DB ?
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FDC_H DB ?
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FDC_R DB ?
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FDC_N DB ?
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; Read operation repetition counter
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ReadRepCounter DB ?
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; Recalibration operation repetition counter
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RecalRepCounter DB ?
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endg
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; Memory area for storing the readed sector
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;FDD_DataBuffer: times 512 db 0 ;DB 512 DUP (?)
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fdd_motor_status db 0
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timer_fdd_motor dd 0
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;**************************************
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;* INITIALIZATION OF DMA MODE FOR FDD *
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;**************************************
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Init_FDC_DMA:
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pushad
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mov al, 0
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out 0x0c, al; reset the flip-flop to a known state.
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mov al, 6 ; mask channel 2 so we can reprogram it.
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out 0x0a, al
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mov al, [dmamode]; 0x46 -> Read from floppy - 0x4A Write to floppy
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out 0x0b, al
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mov al, 0
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out 0x0c, al; reset the flip-flop to a known state.
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mov eax, 0xD000
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out 0x04, al; set the channel 2 starting address to 0
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shr eax, 8
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out 0x04, al
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shr eax, 8
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out 0x81, al
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mov al, 0
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out 0x0c, al; reset flip-flop
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mov al, 0xff;set count (actual size -1)
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out 0x5, al
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mov al, 0x1;[dmasize] ;(0x1ff = 511 / 0x23ff =9215)
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out 0x5, al
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mov al, 2
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out 0xa, al
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popad
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ret
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;***********************************
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;* WRITE BYTE TO FDC DATA PORT *
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;* Parameters: *
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;* AL - byte to write. *
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;***********************************
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FDCDataOutput:
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; DEBUGF 1,'K : FDCDataOutput(%x)',al
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; pusha
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push eax ecx edx
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mov AH, AL ; remember byte to AH
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; Reset controller state variable
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mov [FDC_Status], FDC_Normal
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; Check the readiness of the controller to receive data
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mov DX, 3F4h ; (FDC state port)
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mov ecx, 0x10000 ; set timeout counter
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@@TestRS:
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in AL, DX ; read the RS register
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and AL, 0C0h ; get digits 6 and 7
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cmp AL, 80h ; check digits 6 and 7
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je @@OutByteToFDC
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loop @@TestRS
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; Time out error
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; DEBUGF 1,' timeout\n'
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mov [FDC_Status], FDC_TimeOut
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jmp @@End_5
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; Write byte to data port
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@@OutByteToFDC:
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inc DX
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mov AL, AH
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out DX, AL
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; DEBUGF 1,' ok\n'
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@@End_5:
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; popa
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pop edx ecx eax
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ret
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;******************************************
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;* READ BYTE FROM FDC DATA PORT *
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;* Procedure doesnt have input params. *
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;* Output : *
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;* AL - byte read. *
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;******************************************
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FDCDataInput:
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push ECX
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push DX
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; Reset controller state variable
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mov [FDC_Status], FDC_Normal
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; Check the readiness of the controller to receive data
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mov DX, 3F4h ;(FDC state port)
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mov ecx, 0x10000 ; set timeout counter
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@@TestRS_1:
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in AL, DX ; read the RS register
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and AL, 0C0h ; get digits 6 and 7
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cmp AL, 0C0h ; check digits 6 and 7
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je @@GetByteFromFDC
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loop @@TestRS_1
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; Time out error
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; DEBUGF 1,'K : FDCDataInput: timeout\n'
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mov [FDC_Status], FDC_TimeOut
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jmp @@End_6
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; Get byte from data port
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@@GetByteFromFDC:
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inc DX
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in AL, DX
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; DEBUGF 1,'K : FDCDataInput: %x\n',al
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@@End_6:
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pop DX
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pop ECX
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ret
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;*********************************************
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;* FDC INTERRUPT HANDLER *
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;*********************************************
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FDCInterrupt:
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; dbgstr 'FDCInterrupt'
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; Set the interrupt flag
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mov [FDD_IntFlag], 1
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mov al, 1
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ret
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;*******************************************
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;* WAIT FOR INTERRUPT FROM FDC *
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;*******************************************
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WaitFDCInterrupt:
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pusha
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; Reset operation status byte
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mov [FDC_Status], FDC_Normal
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; Zero out the tick counter
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mov eax, [timer_ticks]
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mov [TickCounter], eax
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; Wait for the floppy disk interrupt flag to be set
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@@TestRS_2:
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call change_task
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cmp [FDD_IntFlag], 0
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jnz @@End_7 ; interrupt occured
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mov eax, [timer_ticks]
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sub eax, [TickCounter]
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cmp eax, 200;50 ;25 ;5 ; wait 5 ticks
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jb @@TestRS_2
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; jl @@TestRS_2
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; Time out error
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; dbgstr 'WaitFDCInterrupt: timeout'
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mov [FDC_Status], FDC_TimeOut
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@@End_7:
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popa
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ret
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;***********************************
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;* Turn on the motor of drive "A:" *
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;***********************************
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FDDMotorON:
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; dbgstr 'FDDMotorON'
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pusha
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; cmp [fdd_motor_status],1
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; je fdd_motor_on
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mov al, [flp_number]
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cmp [fdd_motor_status], al
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je fdd_motor_on
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; Reset the FDD controller
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mov DX, 3F2h ; motor control port
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mov AL, 0
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out DX, AL
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; Select and turn on the drive motor
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cmp [flp_number], 1
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jne FDDMotorON_B
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; call FDDMotorOFF_B
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mov AL, 1Ch ; Floppy A
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jmp FDDMotorON_1
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FDDMotorON_B:
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; call FDDMotorOFF_A
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mov AL, 2Dh ; Floppy B
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FDDMotorON_1:
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out DX, AL
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; Zero out the tick counter
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mov eax, [timer_ticks]
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mov [TickCounter], eax
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; wait 0.5 s
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@@dT:
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call change_task
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mov eax, [timer_ticks]
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sub eax, [TickCounter]
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cmp eax, 50 ;10
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jb @@dT
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; Read results of RESET command
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push 4
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; DEBUGF 1,'K : floppy reset results:'
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@@:
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mov al, 8
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call FDCDataOutput
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call FDCDataInput
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; DEBUGF 1,' %x',al
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call FDCDataInput
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; DEBUGF 1,' %x',al
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dec dword [esp]
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jnz @b
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; DEBUGF 1,'\n'
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pop eax
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cmp [flp_number], 1
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jne fdd_motor_on_B
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mov [fdd_motor_status], 1
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jmp fdd_motor_on
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fdd_motor_on_B:
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mov [fdd_motor_status], 2
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fdd_motor_on:
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call save_timer_fdd_motor
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popa
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ret
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;*****************************************
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;* SAVING TIME STAMP *
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;*****************************************
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save_timer_fdd_motor:
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mov eax, [timer_ticks]
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mov [timer_fdd_motor], eax
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ret
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;*****************************************
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;* CHECK THE MOTOR SHUTDOWN DELAY *
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;*****************************************
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proc check_fdd_motor_status_has_work?
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cmp [fdd_motor_status], 0
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jz .no
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mov eax, [timer_ticks]
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sub eax, [timer_fdd_motor]
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cmp eax, 500
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jb .no
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.yes:
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xor eax, eax
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inc eax
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ret
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.no:
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xor eax, eax
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ret
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endp
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align 4
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check_fdd_motor_status:
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cmp [fdd_motor_status], 0
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je end_check_fdd_motor_status_1
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mov eax, [timer_ticks]
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sub eax, [timer_fdd_motor]
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cmp eax, 500
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jb end_check_fdd_motor_status
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call FDDMotorOFF
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mov [fdd_motor_status], 0
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end_check_fdd_motor_status_1:
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end_check_fdd_motor_status:
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ret
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;**********************************
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;* TURN OFF MOTOR OF DRIVE *
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;**********************************
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FDDMotorOFF:
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; dbgstr 'FDDMotorOFF'
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push AX
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push DX
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cmp [flp_number], 1
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jne FDDMotorOFF_1
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call FDDMotorOFF_A
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jmp FDDMotorOFF_2
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FDDMotorOFF_1:
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call FDDMotorOFF_B
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FDDMotorOFF_2:
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pop DX
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pop AX
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; clearing caching flags due to information obsolescence
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or [floppy_media_flags+0], FLOPPY_MEDIA_NEED_RESCAN
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or [floppy_media_flags+1], FLOPPY_MEDIA_NEED_RESCAN
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ret
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FDDMotorOFF_A:
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mov DX, 3F2h ; motor control port
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mov AL, 0Ch ; Floppy A
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out DX, AL
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ret
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FDDMotorOFF_B:
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mov DX, 3F2h ; motor control port
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mov AL, 5h ; Floppy B
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out DX, AL
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ret
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;*******************************
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;* RECALIBRATE DRIVE "A:" *
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;*******************************
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RecalibrateFDD:
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; dbgstr 'RecalibrateFDD'
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pusha
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call save_timer_fdd_motor
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; Clear the interrupt flag
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mov [FDD_IntFlag], 0
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; Send the "Recalibration" command
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mov AL, 07h
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call FDCDataOutput
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mov AL, [flp_number]
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dec AL
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call FDCDataOutput
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; Wait for the operation to complete
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call WaitFDCInterrupt
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cmp [FDC_Status], 0
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jne .fail
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; Read results of RECALIBRATE command
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; DEBUGF 1,'K : floppy recalibrate results:'
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mov al, 8
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call FDCDataOutput
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call FDCDataInput
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push eax
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; DEBUGF 1,' %x',al
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call FDCDataInput
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; DEBUGF 1,' %x',al
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; DEBUGF 1,'\n'
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pop eax
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test al, 0xC0
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jz @f
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mov [FDC_Status], FDC_DiskNotFound
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@@:
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.fail:
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call save_timer_fdd_motor
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popa
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ret
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;*****************************************************
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;* TRACK SEARCH *
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;* Parameters are passed through global variables: *
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;* FDD_Track - track number (0-79); *
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;* FDD_Head - head number (0-1). *
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;* Result of operation is written to FDC_Status. *
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;*****************************************************
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SeekTrack:
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; dbgstr 'SeekTrack'
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pusha
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call save_timer_fdd_motor
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; Clear the interrupt flag
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mov [FDD_IntFlag], 0
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; Send "Search" command
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mov AL, 0Fh
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call FDCDataOutput
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; Send head / drive number byte
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mov AL, [FDD_Head]
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shl AL, 2
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call FDCDataOutput
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; Send track number byte
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mov AL, [FDD_Track]
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call FDCDataOutput
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; Wait for the operation to complete
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call WaitFDCInterrupt
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cmp [FDC_Status], FDC_Normal
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jne @@Exit
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; Save search result
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mov AL, 08h
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call FDCDataOutput
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call FDCDataInput
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mov [FDC_ST0], AL
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call FDCDataInput
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mov [FDC_C], AL
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; Check search result
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; Is search finished?
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test [FDC_ST0], 100000b
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je @@Err
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; Is the specified track found?
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mov AL, [FDC_C]
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cmp AL, [FDD_Track]
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jne @@Err
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; Does the head number match the specified one?
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; The H bit (Head Address) in ST0 will always return a "0" (c) 82077AA datasheet,
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; description of SEEK command. So we can not verify the proper head.
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; mov AL, [FDC_ST0]
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; and AL, 100b
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; shr AL, 2
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; cmp AL, [FDD_Head]
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; jne @@Err
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; Operation completed successfully
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; dbgstr 'SeekTrack: FDC_Normal'
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mov [FDC_Status], FDC_Normal
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jmp @@Exit
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@@Err: ; Track not found
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; dbgstr 'SeekTrack: FDC_TrackNotFound'
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mov [FDC_Status], FDC_TrackNotFound
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@@Exit:
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call save_timer_fdd_motor
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popa
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ret
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;*******************************************************
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;* READING A DATA SECTOR *
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;* Parameters are passed through global variables: *
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;* FDD_Track - track number (0-79); *
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;* FDD_Head - head number (0-1); *
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;* FDD_Sector - sector number (1-18). *
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;* Result of operation is written to FDC_Status. *
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;* If the read operation is successful, the contents *
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;* of the sector will be written to FDD_DataBuffer. *
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;*******************************************************
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ReadSector:
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; dbgstr 'ReadSector'
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pushad
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call save_timer_fdd_motor
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; Clear the interrupt flag
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mov [FDD_IntFlag], 0
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; Set transmit speed to 500 Kb / s
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mov AX, 0
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mov DX, 03F7h
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out DX, AL
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; Initialize the DMA channel
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mov [dmamode], 0x46
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call Init_FDC_DMA
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; Send "Data read" command
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mov AL, 0E6h ; reading in multi-track mode
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call FDCDataOutput
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mov AL, [FDD_Head]
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shl AL, 2
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or AL, [flp_number]
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dec AL
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call FDCDataOutput
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mov AL, [FDD_Track]
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call FDCDataOutput
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mov AL, [FDD_Head]
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call FDCDataOutput
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mov AL, [FDD_Sector]
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call FDCDataOutput
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mov AL, 2 ; sector size code (512 byte)
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call FDCDataOutput
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mov AL, 18 ;+1; 3Fh ;number of sectors per track
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call FDCDataOutput
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mov AL, 1Bh ; GPL value
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call FDCDataOutput
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mov AL, 0FFh; DTL value
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call FDCDataOutput
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; Waiting for an interrupt at the end of the operation
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call WaitFDCInterrupt
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cmp [FDC_Status], FDC_Normal
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jne @@Exit_1
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; Read the operation completion status
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call GetStatusInfo
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test [FDC_ST0], 11011000b
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jnz @@Err_1
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; dbgstr 'ReadSector: FDC_Normal'
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mov [FDC_Status], FDC_Normal
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jmp @@Exit_1
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@@Err_1:
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; dbgstr 'ReadSector: FDC_SectorNotFound'
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mov [FDC_Status], FDC_SectorNotFound
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@@Exit_1:
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call save_timer_fdd_motor
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popad
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ret
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;*******************************************************
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;* READ SECTOR (WITH RETRY OF OPERATION ON FAILURE) *
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;* Parameters are passed through global variables: *
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;* FDD_Track - track number (0-79); *
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;* FDD_Head - head number (0-1); *
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;* FDD_Sector - sector number (1-18). *
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;* Result of operation is written to FDC_Status. *
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;* If the read operation is successful, the contents *
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;* of the sector will be written to FDD_DataBuffer. *
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;*******************************************************
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ReadSectWithRetr:
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pusha
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; Reset the recalibration repetition counter
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mov [RecalRepCounter], 0
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@@TryAgain:
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; Reset the read operation retry counter
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mov [ReadRepCounter], 0
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@@ReadSector_1:
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call ReadSector
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cmp [FDC_Status], 0
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je @@Exit_2
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cmp [FDC_Status], 1
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je @@Err_3
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; Three times repeat reading
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inc [ReadRepCounter]
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cmp [ReadRepCounter], 3
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jb @@ReadSector_1
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; Three times repeat recalibration
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call RecalibrateFDD
|
|
call SeekTrack
|
|
inc [RecalRepCounter]
|
|
cmp [RecalRepCounter], 3
|
|
jb @@TryAgain
|
|
@@Exit_2:
|
|
popa
|
|
ret
|
|
@@Err_3:
|
|
popa
|
|
ret
|
|
|
|
;*******************************************************
|
|
;* WRITE DATA SECTOR *
|
|
;* Parameters are passed through global variables: *
|
|
;* FDD_Track - track number (0-79); *
|
|
;* FDD_Head - head number (0-1); *
|
|
;* FDD_Sector - sector number (1-18). *
|
|
;* Result of operation is written to FDC_Status. *
|
|
;* If the write operation is successful, the contents *
|
|
;* of FDD_DataBuffer will be written to the sector *
|
|
;*******************************************************
|
|
WriteSector:
|
|
; dbgstr 'WriteSector'
|
|
pushad
|
|
call save_timer_fdd_motor
|
|
; Clear the interrupt flag
|
|
mov [FDD_IntFlag], 0
|
|
; Set transmit speed to 500 Kb / s
|
|
mov AX, 0
|
|
mov DX, 03F7h
|
|
out DX, AL
|
|
; Initialize the DMA channel
|
|
mov [dmamode], 0x4A
|
|
call Init_FDC_DMA
|
|
; Send "Write data" command
|
|
mov AL, 0xC5 ;0x45 ; write in multi-track mode
|
|
call FDCDataOutput
|
|
mov AL, [FDD_Head]
|
|
shl AL, 2
|
|
or AL, [flp_number]
|
|
dec AL
|
|
call FDCDataOutput
|
|
mov AL, [FDD_Track]
|
|
call FDCDataOutput
|
|
mov AL, [FDD_Head]
|
|
call FDCDataOutput
|
|
mov AL, [FDD_Sector]
|
|
call FDCDataOutput
|
|
mov AL, 2 ; sector size code (512 bytes)
|
|
call FDCDataOutput
|
|
mov AL, 18; 3Fh ; sectors per track
|
|
call FDCDataOutput
|
|
mov AL, 1Bh ; GPL value
|
|
call FDCDataOutput
|
|
mov AL, 0FFh; DTL value
|
|
call FDCDataOutput
|
|
; Waiting for an interrupt at the end of the operation
|
|
call WaitFDCInterrupt
|
|
cmp [FDC_Status], FDC_Normal
|
|
jne @@Exit_3
|
|
; Reading the completion status of the operation
|
|
call GetStatusInfo
|
|
test [FDC_ST0], 11000000b ;11011000b
|
|
jnz @@Err_2
|
|
mov [FDC_Status], FDC_Normal
|
|
jmp @@Exit_3
|
|
@@Err_2:
|
|
mov [FDC_Status], FDC_SectorNotFound
|
|
@@Exit_3:
|
|
call save_timer_fdd_motor
|
|
popad
|
|
ret
|
|
|
|
;*******************************************************
|
|
;* WRITE SECTOR (WITH REPEAT ON FAILURE) *
|
|
;* Parameters are passed through global variables: *
|
|
;* FDD_Track - track number (0-79); *
|
|
;* FDD_Head - head number (0-1); *
|
|
;* FDD_Sector - sector number (1-18). *
|
|
;* Result of operation is written to FDC_Status. *
|
|
;* If the write operation is successful, the contents *
|
|
;* of FDD_DataBuffer will be written to the sector *
|
|
;*******************************************************
|
|
WriteSectWithRetr:
|
|
pusha
|
|
; Reset the recalibration repetition counter
|
|
mov [RecalRepCounter], 0
|
|
@@TryAgain_1:
|
|
; Reset the read operation retry counter
|
|
mov [ReadRepCounter], 0
|
|
@@WriteSector_1:
|
|
call WriteSector
|
|
cmp [FDC_Status], 0
|
|
je @@Exit_4
|
|
cmp [FDC_Status], 1
|
|
je @@Err_4
|
|
; Three times repeat writing
|
|
inc [ReadRepCounter]
|
|
cmp [ReadRepCounter], 3
|
|
jb @@WriteSector_1
|
|
; Three times repeat recalibration
|
|
call RecalibrateFDD
|
|
call SeekTrack
|
|
inc [RecalRepCounter]
|
|
cmp [RecalRepCounter], 3
|
|
jb @@TryAgain_1
|
|
@@Exit_4:
|
|
popa
|
|
ret
|
|
@@Err_4:
|
|
popa
|
|
ret
|
|
|
|
;*********************************************
|
|
;* GET INFORMATION ABOUT THE RESULT OF THE OPERATION
|
|
;*********************************************
|
|
GetStatusInfo:
|
|
push AX
|
|
call FDCDataInput
|
|
mov [FDC_ST0], AL
|
|
call FDCDataInput
|
|
mov [FDC_ST1], AL
|
|
call FDCDataInput
|
|
mov [FDC_ST2], AL
|
|
call FDCDataInput
|
|
mov [FDC_C], AL
|
|
call FDCDataInput
|
|
mov [FDC_H], AL
|
|
call FDCDataInput
|
|
mov [FDC_R], AL
|
|
call FDCDataInput
|
|
mov [FDC_N], AL
|
|
pop AX
|
|
ret
|
|
|
|
; Interface for disk subsystem.
|
|
; Assume fixed capacity for 1.44M.
|
|
FLOPPY_CAPACITY = 2880 ; in sectors
|
|
|
|
iglobal
|
|
align 4
|
|
floppy_functions:
|
|
dd .size
|
|
dd 0 ; no close() function
|
|
dd 0 ; no closemedia() function
|
|
dd floppy_querymedia
|
|
dd floppy_read
|
|
dd floppy_write
|
|
dd 0 ; no flush() function
|
|
dd 0 ; no adjust_cache_size() function
|
|
.size = $ - floppy_functions
|
|
endg
|
|
|
|
uglobal
|
|
floppy_media_flags rb 2
|
|
n_sector dd 0 ; temporary save for sector value
|
|
flp_number db 0 ; 1- Floppy A, 2-Floppy B
|
|
old_track db 0 ; old value track
|
|
flp_label rb 15*2 ; Label and ID of inserted floppy disk
|
|
align 4
|
|
; Hardware does not allow to work with two floppies in parallel,
|
|
; so there is one mutex guarding access to any floppy.
|
|
floppy_mutex MUTEX
|
|
endg
|
|
; Meaning of bits in floppy_media_flags
|
|
FLOPPY_MEDIA_PRESENT = 1 ; media was present when last asked
|
|
FLOPPY_MEDIA_NEED_RESCAN = 2 ; media was possibly changed, need to rescan
|
|
FLOPPY_MEDIA_LABEL_CHANGED = 4 ; temporary state
|
|
|
|
iglobal
|
|
floppy1_name db 'fd',0
|
|
floppy2_name db 'fd2',0
|
|
endg
|
|
|
|
; This function is called in boot process.
|
|
; It creates filesystems /fd and/or /fd2, if the system has one/two floppy drives.
|
|
proc floppy_init
|
|
mov ecx, floppy_mutex
|
|
call mutex_init
|
|
; First floppy is present if [DRIVE_DATA] and 0xF0 is nonzero.
|
|
test byte [DRIVE_DATA], 0xF0
|
|
jz .no1
|
|
stdcall disk_add, floppy_functions, floppy1_name, 1, DISK_NO_INSERT_NOTIFICATION
|
|
.no1:
|
|
; Second floppy is present if [DRIVE_DATA] and 0x0F is nonzero.
|
|
test byte [DRIVE_DATA], 0x0F
|
|
jz .no2
|
|
stdcall disk_add, floppy_functions, floppy2_name, 2, DISK_NO_INSERT_NOTIFICATION
|
|
.no2:
|
|
ret
|
|
endp
|
|
|
|
; Returns information about disk media.
|
|
; Floppy drives do not support insert notifications,
|
|
; DISK_NO_INSERT_NOTIFICATION is set,
|
|
; the disk subsystem calls this function before each filesystem operation.
|
|
; If the media has changed, return error for the first call as signal
|
|
; to finalize work with old media and the true geometry for the second call.
|
|
; Assume that media is (possibly) changed anytime when motor is off.
|
|
proc floppy_querymedia
|
|
virtual at esp+4
|
|
.userdata dd ?
|
|
.info dd ?
|
|
end virtual
|
|
; 1. Acquire the global lock.
|
|
mov ecx, floppy_mutex
|
|
call mutex_lock
|
|
mov edx, [.userdata] ; 1 for /fd, 2 for /fd2
|
|
; 2. If the media was reported and has been changed, forget it and report an error.
|
|
mov al, [floppy_media_flags+edx-1]
|
|
and al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN
|
|
cmp al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN
|
|
jnz .not_reported
|
|
.no_media:
|
|
mov [floppy_media_flags+edx-1], 0
|
|
.return_no_media:
|
|
mov ecx, floppy_mutex
|
|
call mutex_unlock
|
|
mov eax, DISK_STATUS_NO_MEDIA
|
|
retn 8
|
|
.not_reported:
|
|
; 3. If we are in the temporary state LABEL_CHANGED, this is the second call
|
|
; after intermediate DISK_STATUS_NO_MEDIA due to media change;
|
|
; clear the flag and return the current geometry without rereading the bootsector.
|
|
cmp [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED
|
|
jz .report_geometry
|
|
; 4. Try to read the bootsector.
|
|
mov [flp_number], dl
|
|
mov [FDC_Status], 0
|
|
call floppy_read_bootsector
|
|
; 5. If reading bootsector failed, assume that media is not present.
|
|
mov edx, [.userdata]
|
|
cmp [FDC_Status], 0
|
|
jnz .no_media
|
|
; 6. Check whether the previous status is "present". If not, go to 10.
|
|
push esi edi
|
|
imul edi, edx, 15
|
|
add edi, flp_label-15
|
|
mov esi, FDD_BUFF+39
|
|
mov ecx, 15
|
|
test [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT
|
|
jz .set_label
|
|
; 7. Compare the old label with the current one.
|
|
rep cmpsb
|
|
; 8. If the label has not changed, go to 11.
|
|
jz .ok
|
|
; 9. If the label has changed, store it, enter temporary state LABEL_CHANGED
|
|
; and report DISK_STATUS_NO_MEDIA.
|
|
; dbgstr 'floppy label changed'
|
|
add esi, ecx
|
|
add edi, ecx
|
|
mov ecx, 15
|
|
sub esi, ecx
|
|
sub edi, ecx
|
|
rep movsb
|
|
mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED
|
|
pop edi esi
|
|
jmp .return_no_media
|
|
.set_label:
|
|
; 10. The previous state was "not present". Copy the label.
|
|
rep movsb
|
|
.ok:
|
|
pop edi esi
|
|
.report_geometry:
|
|
; 11. Fill DISKMEDIAINFO structure.
|
|
mov ecx, [.info]
|
|
and [ecx+DISKMEDIAINFO.Flags], 0
|
|
mov [ecx+DISKMEDIAINFO.SectorSize], 512
|
|
mov dword [ecx+DISKMEDIAINFO.Capacity], FLOPPY_CAPACITY
|
|
and dword [ecx+DISKMEDIAINFO.Capacity+4], 0
|
|
; 12. Update state: media is present, data are actual.
|
|
mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT
|
|
; 13. Release the global lock and return successful status.
|
|
mov ecx, floppy_mutex
|
|
call mutex_unlock
|
|
xor eax, eax
|
|
retn 8
|
|
endp
|
|
|
|
proc floppy_read_bootsector
|
|
pushad
|
|
mov [FDD_Track], 0 ; Cylinder
|
|
mov [FDD_Head], 0 ; Head
|
|
mov [FDD_Sector], 1 ; Sector
|
|
call FDDMotorON
|
|
call RecalibrateFDD
|
|
cmp [FDC_Status], 0
|
|
jne .nothing
|
|
call SeekTrack
|
|
cmp [FDC_Status], 0
|
|
jne .nothing
|
|
call ReadSectWithRetr
|
|
.nothing:
|
|
popad
|
|
ret
|
|
endp
|
|
|
|
read_chs_sector:
|
|
call calculate_chs
|
|
call ReadSectWithRetr
|
|
ret
|
|
|
|
save_chs_sector:
|
|
call calculate_chs
|
|
call WriteSectWithRetr
|
|
ret
|
|
|
|
calculate_chs:
|
|
mov bl, [FDD_Track]
|
|
mov [old_track], bl
|
|
mov ebx, 18
|
|
xor edx, edx
|
|
div ebx
|
|
inc edx
|
|
mov [FDD_Sector], dl
|
|
mov edx, eax
|
|
shr eax, 1
|
|
and edx, 1
|
|
mov [FDD_Track], al
|
|
mov [FDD_Head], dl
|
|
mov dl, [old_track]
|
|
cmp dl, [FDD_Track]
|
|
je no_seek_track_1
|
|
call SeekTrack
|
|
no_seek_track_1:
|
|
ret
|
|
|
|
; Writes one or more sectors to the device.
|
|
proc floppy_write
|
|
mov dl, 1
|
|
jmp floppy_read_write
|
|
endp
|
|
|
|
; Reads one or more sectors from the device.
|
|
proc floppy_read
|
|
mov dl, 0
|
|
endp
|
|
|
|
; Common part of floppy_read and floppy_write.
|
|
proc floppy_read_write userdata:dword, buffer:dword, start_sector:qword, numsectors_ptr:dword
|
|
virtual at ebp-8
|
|
.sectors_todo dd ?
|
|
.operation db ?
|
|
end virtual
|
|
push edx ; save operation code to [.operation]
|
|
; 1. Get number of sectors to read/write
|
|
; and zero number of sectors that were actually read/written.
|
|
mov eax, [numsectors_ptr]
|
|
push dword [eax] ; initialize [.sectors_todo]
|
|
and dword [eax], 0
|
|
push ebx esi edi ; save used registers to be stdcall
|
|
; 2. Acquire the global lock.
|
|
mov ecx, floppy_mutex
|
|
call mutex_lock
|
|
; 3. Set floppy number for this operation.
|
|
mov edx, [userdata]
|
|
mov [flp_number], dl
|
|
; 4. Read/write sector-by-sector.
|
|
.operation_loop:
|
|
; 4a. Check that the sector is inside the media.
|
|
cmp dword [start_sector+4], 0
|
|
jnz .end_of_media
|
|
mov eax, dword [start_sector]
|
|
cmp eax, FLOPPY_CAPACITY
|
|
jae .end_of_media
|
|
; 4b. For read operation, call read_chs_sector and then move data from FDD_BUFF to [buffer].
|
|
; For write operation, move data from [buffer] to FDD_BUFF and then call save_chs_sector.
|
|
cmp [.operation], 0
|
|
jz .read
|
|
mov esi, [buffer]
|
|
mov edi, FDD_BUFF
|
|
mov ecx, 512/4
|
|
rep movsd
|
|
mov [buffer], esi
|
|
call save_chs_sector
|
|
jmp @f
|
|
.read:
|
|
call read_chs_sector
|
|
mov esi, FDD_BUFF
|
|
mov edi, [buffer]
|
|
mov ecx, 512/4
|
|
rep movsd
|
|
mov [buffer], edi
|
|
@@:
|
|
; 4c. If there was an error, propagate it to the caller.
|
|
cmp [FDC_Status], 0
|
|
jnz .fail
|
|
; 4d. Otherwise, increment number of sectors processed and continue the loop.
|
|
mov eax, [numsectors_ptr]
|
|
inc dword [eax]
|
|
inc dword [start_sector]
|
|
dec [.sectors_todo]
|
|
jnz .operation_loop
|
|
; 5. Release the global lock and return with the correct status.
|
|
push 0
|
|
.return:
|
|
mov ecx, floppy_mutex
|
|
call mutex_unlock
|
|
pop eax
|
|
pop edi esi ebx ; restore used registers to be stdcall
|
|
ret ; this translates to leave/retn N and purges local variables
|
|
.fail:
|
|
push -1
|
|
jmp .return
|
|
.end_of_media:
|
|
push DISK_STATUS_END_OF_MEDIA
|
|
jmp .return
|
|
endp
|