; ---------------- Defines for the Filesystem Interface -------
+
;*****************************************************
;* Disk-Manager constants *
;*****************************************************
;*****************************************************
;* CP/M to host disk constants *
;*****************************************************
- .equ MAXDISKS = 6 ;Max number of Disks (partitions)
+ .equ MAXDISKS = 6 ;Max number of Disks (partitions)\r
.equ PARTENTRY_SIZE = 9 ;Size of a Partitiontableentry
.equ blksize = 1024 ;CP/M allocation size
.equ hostsize = 512 ;host disk sector size
.equ WRDIR = 1 ;write to directory
.equ WRUAL = 2 ;write to unallocated
.equ WRTMSK= 3 ;write type mask
-
- .equ READ_FUNC = 7
- .equ WRITE_FUNC = 6
- .equ BOOT_FUNC = 5
- .equ HOME_FUNC = 4
-
;----------------------------------------------- Start of Data Segment
.dseg
-; The following 3 variables are copied from DRAM.
-; Don't change order.
-
-biosdrvtbl: .byte 2 ;
-biosdirbuf: .byte 2 ;
-biosenddat: .byte 2 ;
+ndisks: .byte 1 ;Number of CP/M disks
-ndisks: .byte 1 ;Number of CP/M disks
+seekdsk: .byte 1 ;seek disk number
+seektrk: .byte 2 ;seek track number
+seeksec: .byte 1 ;seek sector number
-; The following 5 variables are accessed from 8080/z80 via the
-; virtual port interface. Don't change order.
+unacnt: .byte 1 ;unalloc rec cnt
+unadsk: .byte 1 ;last unalloc disk
+unatrk: .byte 2 ;last unalloc track
+unasec: .byte 1 ;last unalloc sector
-biospar_base:
-bcbadr: .byte 2 ;adr of BiosControlBlock
-seekdsk: .byte 1 ;seek disk number
-seektrk: .byte 2 ;seek track number
-seeksec: .byte 2 ;seek sector number
-dmaadr: .byte 2 ;last dma address
+erflag: .byte 1 ;error reporting
+wrtype: .byte 1 ;write operation type
+dmaadr: .byte 2 ;last dma address
-unacnt: .byte 1 ;unalloc rec cnt
-unadsk: .byte 1 ;last unalloc disk
-unatrk: .byte 2 ;last unalloc track
-unasec: .byte 1 ;last unalloc sector
-
-erflag: .byte 1 ;error reporting
-wrtype: .byte 1 ;write operation type
-
-hostbuf: .byte hostsize ;host buffer (from/to SD-card)
+hostbuf: .byte hostsize ;host buffer (from/to SD-card)
hostparttbl: .byte PARTENTRY_SIZE*MAXDISKS ;host partition table (type, start sector, sector count)
hostparttbltop:
-hostdsk: .byte 1 ;host disk number
-hosttype: .byte 1 ;host disk type (same entry as 1 parition entry)
-hostlba: .byte 3 ;host sector number (relative to partition start)
+hostdsk: .byte 1 ;host disk number
+hosttype: .byte 1 ;host disk type (same entry as 1 parition entry)
+hostlba: .byte 3 ;host sector number (relative to partition start)
; ------------------------------- Start of Code Segment
.cseg
; ====================================================================
-; Function: Virtual Port Interface
+; Function: Get a Pointer to a Partitiontable entry
; ====================================================================
; Parameters
; --------------------------------------------------------------------
-; Registers :
-; Variables :
-;
+; Registers : [w] z Pointer to the Partitionentry
+; [r] xl Number of Diskentry to Read
; --------------------------------------------------------------------
; Description:
; ====================================================================
+dsk_getpartentry:
+
+ ldiw z,hostparttbl
+ mov temp,xl
-dsk_param_getadr:
- ldiw z,biospar_base
- add zl,temp3
- adc zh,_0
- ret
-
-dsk_param_wr:
- rcall dsk_param_getadr
- st z,temp
- cpi temp3,bcbadr+1-seektrk
- brne dsk_param_wr1
- std z+1,_0
-dsk_param_wr1:
- cpi temp3,bcbadr+1-biospar_base
- breq SetBCB
- ret
-
-dsk_param_rd:
- cpi temp3,seekdsk-biospar_base
- breq dskDiskCheck
- rcall dsk_param_getadr
- ld temp,z
+dsk_getpartentryloop:
+ cp temp,_0
+ breq dsk_getpartentryloopend
+ adiw z,PARTENTRY_SIZE
+ dec temp
+ rjmp dsk_getpartentryloop
+dsk_getpartentryloopend:
ret
+; ====================================================================
+; Function:
+; ====================================================================
+; Parameters
+; --------------------------------------------------------------------
+; Registers : none
+; Variables : [r] seeksec Sector to read
+; [r] seektrk Track to read
+; --------------------------------------------------------------------
+; Description:
+; ====================================================================
dskDiskCheck:
lds temp2,seekdsk
cpi temp2,RAMDISKNR
; Check if selected disk # is less then # of disks.
lds temp,ndisks
- tst temp ;0 disks?
+ tst temp
brne dsk_dchpart1
-; No disks yet, need to init
+; Need to init
- rcall mgr_init_partitions ;disk chanched?
- sbrs temp,7
- rjmp dsk_dchpart0
- push temp
- rcall dsk_drvtblinit
- rcall dbg_prdrvtbl
- pop temp
-dsk_dchpart0:
+ rcall mgr_init_partitions
cbr temp,0x80
lds temp2,seekdsk
dsk_dchpart1:
cp temp2,temp
brsh dsk_dcher
-
- printnewline
- printstring "Select: "
- mov temp,temp2
- rcall printhex
-
- lds xl,biosdrvtbl
- lds xh,biosdrvtbl+1
- lsl temp2 ;drive #
- add xl,temp2
- adc xh,_0
- rcall dram_readw_pp
-
- printstring ", "
- rcall printhexw
-
- or temp,temp2
- brne dsk_dchend
- lds temp,seekdsk
- rcall dsk_diskinit
- brne dsk_dcher
dsk_dchend:
ldi temp,0
lds temp,erflag
ret
-SetBCB:
- lds xl,bcbadr
- mov xh,temp
- ldiw z,biosdrvtbl
- ldi temp3,6
-sbcb_l:
- rcall dram_read_pp
- st z+,temp
- dec temp3
- brne sbcb_l
-
- rcall dbg_print_biosd
- rcall dsk_drvtblinit
-
+dskDiskSel:
+ sts seekdsk,temp
ret
-;---------------------------------------------------------------------
-
-dbg_prdrvtbl:
- push xh
- push xl
- push temp3
- push temp2
- push temp
- printnewline
- printstring "drvtbl ("
- lds xl,biosdrvtbl
- lds xh,biosdrvtbl+1
- movw temp,x
- rcall printhexw
- printstring "): "
- ldi temp3,16
-dbg_pcpel:
- rcall dram_readw_pp
- rcall printhexw
- printstring " "
- dec temp3
- brne dbg_pcpel
- pop temp
- pop temp2
- pop temp3
- pop xl
- pop xh
+dskTrackSel_l:
+ sts seektrk,temp
+ sts seektrk+1,_0
ret
-
-; -------------------------------------------------------------------
-dbg_print_biosd:
- printnewline
- lds temp,bcbadr
- lds temp2,bcbadr+1
- rcall printhexw
- printstring " "
- lds temp,biosdrvtbl
- lds temp2,biosdrvtbl+1
- rcall printhexw
- printstring " "
- lds temp,biosdirbuf
- lds temp2,biosdirbuf+1
- rcall printhexw
- printstring " "
- lds temp,biosenddat
- lds temp2,biosenddat+1
- rcall printhexw
- printstring " "
-
- ret
-
-
-; -------------------------------------------------------------------
-
- .dseg
-tmpdpb: .byte 15
-
- .cseg
-
-; init bios disk tables.
-; leave drive 'A' out for now
-
-
- rcall dbg_prdrvtbl
-
- rcall dsk_drvtblinit
- rcall dbg_prdrvtbl
-
- lds temp,biosenddat
- lds temp2,biosenddat+1
- rcall heap_init
-
- ldi temp,1
-dsk_pdil:
- cp temp,temp2
- brsh dsk_pdie
- push temp2
- push temp
- rcall dsk_diskinit
- pop temp
- pop temp2
- inc temp
- rjmp dsk_pdil
-
-
-
-dsk_pdie:
- mov temp,temp2
-; Test DPBs (avrcpm format)
-
-dpblist:
-;dpb243
- .db 0x1A,0x00 ;spt
- .db 0x03,0x07 ;block shift, bock mask
- .db 0x00,0xF2 ;extent mask, low(disk size -1),
- .db 0x00,0x3F ;high(disk size -1), low(dir max)
- .db 0x00,0xC0 ;high(dir max), alloc0
- .db 0x00,0x10 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-;dpb243
- .db 0x1A,0x00 ;spt
- .db 0x03,0x07 ;block shift, bock mask
- .db 0x00,0xF2 ;extent mask, low(disk size -1),
- .db 0x00,0x3F ;high(disk size -1), low(dir max)
- .db 0x00,0xC0 ;high(dir max), alloc0
- .db 0x00,0x10 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-;dpb243
- .db 0x1A,0x00 ;spt
- .db 0x03,0x07 ;block shift, bock mask
- .db 0x00,0xF2 ;extent mask, low(disk size -1),
- .db 0x00,0x3F ;high(disk size -1), low(dir max)
- .db 0x00,0xC0 ;high(dir max), alloc0
- .db 0x00,0x10 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-;dpb243
- .db 0x1A,0x00 ;spt
- .db 0x03,0x07 ;block shift, bock mask
- .db 0x00,0xF2 ;extent mask, low(disk size -1),
- .db 0x00,0x3F ;high(disk size -1), low(dir max)
- .db 0x00,0xC0 ;high(dir max), alloc0
- .db 0x00,0x10 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-#if 0
-;rd1016
- .db 0x20,0x00 ;spt
- .db 0x04,0x0F ;block shift, bock mask
- .db 0x00,0xFB ;extent mask, low(disk size -1),
- .db 0x01,0xBF ;high(disk size -1), low(dir max)
- .db 0x00,0xE0 ;high(dir max), alloc0
- .db 0x00,0x30 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-;rd9192s
- .db 0x20,0x00 ;spt
- .db 0x05,0x1F ;block shift, bock mask
- .db 0x01,0xFD ;extent mask, low(disk size -1),
- .db 0x07,0xFF ;high(disk size -1), low(dir max)
- .db 0x01,0xF0 ;high(dir max), alloc0
- .db 0x00,0x80 ;alloc1, low(chk size)
- .db 0x00,0x02 ;high(chk size), low(offset)
- .db 0x00,0x00 ;high(offset), fill
-#endif
-
-; Test
-cpy_dpb:
- push zh
- push zl
- push yh
- push yl
- ldiw z,dpblist*2
- ldi temp2,16
- mul temp,temp2
- add zl,_tmp0
- adc zh,_tmp1
- ldiw y,tmpdpb
-cpydpb_l:
- lpm temp,z+
- st y+,temp
- cpi yl,low(tmpdpb + 15)
- brne cpydpb_l
- pop yl
- pop yh
- pop zl
- pop zh
+dskTrackSel_h:
+ sts seektrk+1,temp
ret
-
-; clear drive table
-; for now, only entries 1 - 3 are cleared.
-; ====================================================================
-; Function: Clear drive table
-; ====================================================================
-; Parameters
-; --------------------------------------------------------------------
-; Registers :
-; Variables :
-;
-; --------------------------------------------------------------------
-; Description:
-; ====================================================================
-
-; For now, only entries 1 - 3 are cleared.
-
-dsk_drvtblinit:
- ldsw x,biosdrvtbl
- adiw x,2
- ldi temp3,3
-dsk_drvi_l:
- ldi temp,0
- ldi temp2,0
- rcall dram_writew_pp
- dec temp3
- brne dsk_drvi_l
-
- lds temp,biosenddat
- lds temp2,biosenddat+1
- rcall heap_init
- clr temp
+dskSecSel:
+ sts seeksec,temp
ret
-
-; ----------------------------------------------------------------------
-; Init CP/M data structures
-; temp = drive #
-;
-
-
-dsk_diskinit:
- mov temp3,temp ;save disk #
-
-
-; Test
- rcall cpy_dpb
-
-
-
-
-; get mem for DPH
-; -----------------------------------------------------------------
-; DPH: | XLT | | | |DIRBUF | DPB | CSV | ALV |
-; -----------------------------------------------------------------
-;(offset) 0 2 4 6 8 10 12 14
-
- ldi temp, low (16)
- ldi temp2,high(16)
- rcall heap_get
- brne dsk_di_1
- rjmp dsk_di_err ;
-dsk_di_1:
- movw x,temp
- movw y,temp
- ldi temp,0
- ldi temp2,0
- rcall dram_writew_pp ;XLT
- adiw x,6
- lds temp,biosdirbuf
- lds temp2,biosdirbuf+1
- rcall dram_writew_pp ;DIRBUF
-
-; get mem for DPB
-; -------------------------------------------------------------
-; DPB: | SPT |BSH|BLM|EXM| DSM | DRM |AL0|AL1| CKS | OFF |
-; -------------------------------------------------------------
-; 0 5 7 11 13
-
- ldi temp, low (15)
- ldi temp2,high(15)
- rcall heap_get
- breq dsk_di_err_p1
- movw x,temp
-
- ldiw z,tmpdpb
-dsk_dicpl:
- ld temp,z+
- rcall dram_write_pp
- cpi zl,low(tmpdpb + 15)
- brne dsk_dicpl
- sbiw x,15
- movw temp,x
- movw x,y
- adiw x,10
- rcall dram_writew_pp ;DPB
-
-; get mem for dir check vector
-
- lds temp,tmpdpb+11 ;cks
- lds temp2,tmpdpb+11+1
- cp temp,_0
- cpc temp2,_0
- breq dsk_dicks0
- rcall heap_get
- breq dsk_di_err_p1
-dsk_dicks0:
- rcall dram_writew_pp ;CSV
-
-; get mem for alloc vector
-
- lds temp,tmpdpb+5 ;dsm
- lds temp2,tmpdpb+5+1
- subi temp, low (-8)
- sbci temp2,high(-8)
- lsr temp2
- ror temp
- lsr temp2
- ror temp
- lsr temp2
- ror temp ;(dsm+1+7)/8
- rcall heap_get
- breq dsk_di_err_p1
- rcall dram_writew_pp ;ALV
-
-; success, insert DPH into drvtbl
-
- lds xl,biosdrvtbl
- lds xh,biosdrvtbl+1
- lsl temp3 ;drive #
- add xl,temp3
- adc xh,_0
- movw temp,y
- rcall dram_writew_pp
- clr temp
+dskDmal:
+ sts dmaadr,temp
ret
-; error, free mem
-
-dsk_di_err_p1:
- movw temp,y
- rcall heap_release
-dsk_di_err:
- ldi temp,1
- or temp,temp
+dskDmah:
+ sts dmaadr+1,temp
ret
-
-; ====================================================================
-; Function: Get a Pointer to a Partitiontable entry
-; ====================================================================
-; Parameters
-; --------------------------------------------------------------------
-; Registers : [w] z Pointer to the Partitionentry
-; [r] xl Number of Diskentry to Read
-; [w] _tmp0 scratch
-; [w] _tmp1 "
-; --------------------------------------------------------------------
-; Description:
-; ====================================================================
-dsk_getpartentry:
-
- ldi zl,PARTENTRY_SIZE
- mul xl,zl
- ldiw z,hostparttbl
- add zl,_tmp0
- add zh,_tmp1
- ret
-
; ====================================================================
; Function: Does a Disk interaction
; ====================================================================
; Parameters
; --------------------------------------------------------------------
-; Registers : in: temp
+; Registers : none
; Variables : [r] seekdsk Number of Disk to Read
-; [r] seeksec Sector to read
+; [r] seeksec Sector to read
; [r] seektrk Track to read
; --------------------------------------------------------------------
; Description:
dsk_read:
sts erflag,_0
sbi flags,readop ; Set read operation flag
-
- ;RAM disk?
- lds xl,seekdsk
-#if RAMDISKCNT
- cpi xl,RAMDISKNR
- brlt PC+2
- rjmp rdsk_read
-#endif
+ lds xl,seekdsk
rcall dsk_getpartentry ; Get Paritiontableentry
- ld temp,z ; Get Partitiontype
+ ld temp,z ; Get Partitiontype
; Isn't it a Disk ?
- cpi temp,dskType_None
+ cpi temp,dskType_None
brne PC+2
rjmp dsk_read_err
-
+; Is it a RamDisk ?
+ cpi temp,dskType_RAM
+ brne PC+2
+ rjmp rdsk_read
; It must be a FAT16-Imagefile or CP/M Partition.
- sts unacnt,_0
- sbi flags,rsflag ;must read data
- ldi temp,WRUAL ;write type
- sts wrtype,temp ;treat as unalloc
+ sts unacnt,_0
+ sbi flags,rsflag ;must read data
+ ldi temp,WRUAL ;write type
+ sts wrtype,temp ;treat as unalloc
rjmp dsk_rwoper ;to perform the read
dsk_read_err:
; ====================================================================
; Parameters
; --------------------------------------------------------------------
-; Registers : in: temp Write type
-; Variables : [r] seekdsk Number of Disk to Read
-; [r] seeksec Sector to read
-; [r] seektrk Track to read
+; Registers : none
+; Variables : [r] seekdsk Number of Disk to Read
+; [r] seeksec Sector to read
+; [r] seektrk Track to read
; --------------------------------------------------------------------
; Description:
; ====================================================================
dsk_write:
;write the selected sector
- sts erflag,_0
- cbi flags,readop ; not a read operation
-
- ;RAM disk?
- lds xl,seekdsk
-#if RAMDISKCNT
- cpi xl,RAMDISKNR
- brlt PC+2
- rjmp rdsk_write
-#endif
+ sts erflag,_0
+ cbi flags,readop ; not a read operation
+ lds xl,seekdsk
rcall dsk_getpartentry ; Get Paritiontableentry
- ld temp2,z ; Get Partitiontype
+ ld temp,z ; Get Partitiontype
; Isn't it a Disk ?
- cpi temp2,dskType_None
+ cpi temp,dskType_None
brne PC+2
rjmp dsk_write_err
+; Is it a RamDisk ?
+ cpi temp,dskType_RAM
+ brne PC+2
+ rjmp rdsk_write
+
; It must be a FAT16-Imagefile or CP/M Partition.
- cbi flags,readop ;not a read operation
+ cbi flags,readop ;not a read operation
andi temp,WRTMSK
- sts wrtype,temp ;save write type
+ sts wrtype,temp ;save write type
- cpi temp,WRUAL ;write unallocated?
+ cpi temp,WRUAL ;write unallocated?
brne dsk_chkuna ;check for unalloc
; write to unallocated, set parameters
projects / avrcpm.git / blobdiff