forked from KolibriOS/kolibrios
369 lines
9.0 KiB
PHP
369 lines
9.0 KiB
PHP
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;### fdc.inc ### Menuetos floppy stuff.
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;Version 0.2: Write individual tracks. / Sync ramdisk <-> floppy
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;Version 0.1: Write full ramdisk to floppy.
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;<EFBFBD>loppyright Tolle.
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;depends on:
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;restorefatchain
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;memmove
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;Int 6 (sys32.inc) should call fdc_irq func.
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;The ramdisk should be at 0x100000
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;Keeping track of the tracks.
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iglobal
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cylinder db 0
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sector db 1
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head db 0
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;Memory and dma variables.
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fdcmem dd 0x100000
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cpymem dd 0x100000
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dmamem dd 0x100000
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endg
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uglobal
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dmasize db 0x0
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dmamode db 0x0
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endg
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iglobal
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;function pointers.
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fdc_irq_func dd fdc_null
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fdc_pump_func dd fdc_null
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endg
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uglobal
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;General stuff
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fdc_st0 db 0 ;status register 0 of last resultphase.
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fdc_mutex db 0 ;wait in line. (Block calling app)
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fdc_callspending db 0 ;mystery sauce
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fdc_settings dd 0 ;bitfield.
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endg
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;Bit 0 enable direct file write [yes/no]
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fdc_set: ;ebx: fdc_settings bitfield.
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mov [fdc_settings],ebx
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ret
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fdc_get: ;returns fdc_settings in ecx
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mov ecx, [fdc_settings]
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ret
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fdc_init: ;start with clean tracks.
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mov edi,0xD201
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mov al,0
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mov ecx,160
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rep stosb
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ret
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fdc_filesave: ;ebx: cluster to be saved.
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pusha ;returns immediately. does not trigger a write.
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mov eax,ebx
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add eax,31
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mov bl,18
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div bl
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mov ah,0
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add eax,0xD201
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mov [eax],byte 1 ;This track is now dirty.
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popa
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ret
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fdc_writeramdisk: ;mark all tracks as dirty.
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mov edi,0xD201
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mov al,1
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mov ecx,160
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rep stosb
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jmp fdc_commitflush
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fdc_commitfile: ;flush dirty tracks to floppy
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test [fdc_settings],1 ;...but only if this is really wanted by the user.
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je fdc_commitend
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fdc_commitflush:
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cmp [fdc_callspending],5
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je fdc_commitend
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inc [fdc_callspending]
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cmp [fdc_callspending],1
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je fdc_commitonce
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fdc_commitend:
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ret
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fdc_commitonce: ;One at a time.
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.stall:
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cli
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cmp [fdc_mutex],0
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jne .stallret
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mov [fdc_mutex],1
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jmp .goahead
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.stallret:
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sti
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jmp .stall
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.goahead:
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sti
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fdc_commitramdisk:
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call restorefatchain
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;Move the bootsector to a safe place.
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mov eax,0x100000
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mov ebx,0xD000
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mov ecx,512
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call memmove
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;Always write the FAT table
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mov eax,0xD201
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mov [eax],byte 1
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inc eax
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mov [eax],byte 1
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mov [dmamode],0x4A ;read from memory to floppy.
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mov [dmasize],0x1 ;read 512 bytes sectors.
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mov [fdc_irq_func],fdc_commitramdisk1
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call fdc_floppy_on ;start floppy A: moter starts interruptflow.
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ret
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fdc_commitramdisk1:
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mov [fdc_irq_func],fdc_recalibrate_result
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mov [fdc_pump_func],fdc_commitramdisk2
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call fdc_recalibrate ;retract the head to cylinder 0, sector 1
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ret
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fdc_commitramdisk2:
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mov[head],0 ;set variables.
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mov[cylinder],0
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mov [sector],1
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mov[cpymem],0x102400
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mov [fdc_pump_func],fdc_fullpump
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call fdc_write ;fdc_write will continue interruptflow
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ret
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fdc_fullpump:
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add [dmamem],512
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add [sector],1
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cmp [sector],19
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jne .clusterwrite
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sub [dmamem],9216
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mov eax,[cpymem]
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mov ebx,[fdcmem]
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mov ecx,9216
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call memmove
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add [cpymem],9216
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cmp [head],0
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je .nocylinderchange
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add [cylinder],1
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.nocylinderchange:
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xor [head],1
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cmp [cylinder],80
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jne .noendofwrite
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mov[fdc_irq_func],fdc_complete
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call fdc_floppy_off
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call fdc_init
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jmp .end
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.noendofwrite:
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mov [sector],1
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.clusterwrite:
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xor eax,eax
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mov al,[cylinder]
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shl eax,1
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add al,[head]
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add eax,0xD201
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mov bl,[eax]
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cmp bl,1
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jne fdc_fullpump
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call fdc_write
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.end:
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ret
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fdc_write:
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call fdc_program_dma
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call fdc_seek
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ret
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fdc_seek:
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mov al, 0x0f
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call fdc_write_reg
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mov al,[head]
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shl al,2
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call fdc_write_reg
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mov al,[cylinder]
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call fdc_write_reg
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mov [fdc_irq_func],fdc_seek_result
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ret
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fdc_seek_result:
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call fdc_sensei
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cmp al,[cylinder]
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je .succes
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call fdc_seek
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jmp .end
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.succes:
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call fdc_write_sector
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.end:
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ret
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fdc_write_sector:
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mov al,0x45 ;write sector command
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fdc_commandphase:
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call fdc_write_reg
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mov al,[head]
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shl al,2
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call fdc_write_reg
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mov al,[cylinder]
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call fdc_write_reg
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mov al,[head]
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call fdc_write_reg
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mov al,[sector]
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call fdc_write_reg
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mov al,2 ;Sector size (2 ~> 512 bytes)
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call fdc_write_reg
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mov al,18 ;last sector on track.
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call fdc_write_reg
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mov al,27 ;length of GAP3
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call fdc_write_reg
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mov al,0xFF ;data length, ignored.
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call fdc_write_reg
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mov [fdc_irq_func],fdc_resultphase
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ret
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fdc_resultphase:
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call fdc_read_reg
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mov [fdc_st0],al
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mov cx,6
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.readresult:
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call fdc_read_reg
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loop .readresult
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and [fdc_st0],11000000b
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cmp [fdc_st0],byte 0
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jz .succes
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call fdc_seek
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jmp .end
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.succes:
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call [fdc_pump_func]
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.end:
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ret
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fdc_sensei:
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mov al,0x08 ;get interrupt status command
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call fdc_write_reg
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call fdc_read_reg ;get result in al;
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and al,0x80
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cmp al,0x80
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je fdc_sensei ;retry
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call fdc_read_reg
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ret
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fdc_program_dma:
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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,[dmamem]
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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, [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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ret
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fdc_recalibrate:
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mov al,0x07 ;calibrate command
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call fdc_write_reg
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mov al,0 ;select drive 0
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call fdc_write_reg
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ret
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fdc_recalibrate_result:
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mov al,0x08 ;get interrupt status command
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call fdc_write_reg ;send it
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call fdc_read_reg ;get command in al;
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cmp al,0x80
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je fdc_recalibrate_result
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mov ah,al
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call fdc_read_reg
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cmp ah,0x70
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jne .end
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call fdc_recalibrate
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jmp .reallyend
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.end:
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call [fdc_pump_func]
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.reallyend:
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ret
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fdc_busy:
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.command_check:
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mov dx,0x3F4
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in al,dx
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and al,0x10
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cmp al,0x10
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je .command_check
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ret
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fdc_read_reg:
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status_check:
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mov dx,0x3F4
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in al,dx
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and al,0xc0
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cmp al,0xc0
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jne status_check
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mov dx, 0x3F5
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in al, dx
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ret
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fdc_write_reg:
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mov bl,al
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.command_check:
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mov dx,0x3F4
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in al,dx
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and al,0x80
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cmp al,0x80
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jne .command_check
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mov al,bl
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mov dx,0x3F5
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out dx,al
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ret
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fdc_floppy_off:
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mov al,0xC
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mov dx,0x3f2
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out dx,al
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ret
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fdc_floppy_on:
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mov dx,0x3f2
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mov al,0x0
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out dx,al
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mov al,0x1C
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out dx,al
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mov eax,50
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call delay_hs
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ret
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fdc_complete:
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mov eax,0xD000
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mov ebx,0x100000
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mov ecx,512
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call memmove
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mov [fdc_irq_func],fdc_null
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mov [fdc_mutex],0
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dec [fdc_callspending]
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cmp [fdc_callspending],0
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je .realyend
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mov [fdc_mutex],1
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call fdc_commitramdisk
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.realyend:
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ret
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fdc_irq:
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call [fdc_irq_func]
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fdc_null:
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ret
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