avr/dsk_cpm.asm

   1 ;    Various functions for the Interaction with the CPM Filesystem
   2 ;
   3 ;    Copyright (C) 2010 Frank Zoll
   4 ;
   5 ;    This file is part of avrcpm.
   6 ;
   7 ;    avrcpm is free software: you can redistribute it and/or modify it
   8 ;    under the terms of the GNU General Public License as published by
   9 ;    the Free Software Foundation, either version 3 of the License, or
  10 ;    (at your option) any later version.
  11 ;
  12 ;    avrcpm is distributed in the hope that it will be useful,
  13 ;    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;    GNU General Public License for more details.
  16 ;
  17 ;    You should have received a copy of the GNU General Public License
  18 ;    along with avrcpm.  If not, see <http://www.gnu.org/licenses/>.
  19 ;
  20 ;    $Id$
  21 ;
  22
  23 #ifndef CPMDSK_SUPPORT
  24         #define CPMDSK_SUPPORT 1
  25 #endif
  26
  27 #if CPMDSK_SUPPORT
  28
  29
  30 ;----------------------------------------------- Start of Code Segment
  31         .cseg
  32
  33 ; ====================================================================
  34 ; Function: Does a Disk write operation
  35 ; ====================================================================
  36 ; Parameters
  37 ; --------------------------------------------------------------------
  38 ; Registers  : none
  39 ; Variables  : [r] seekdsk              Number of Disk to Read
  40 ;                          [r] seeksec          Sector to read
  41 ;              [r] seektrk              Track  to read
  42 ; hostdsk = host disk #,  (partition #)
  43 ; hostlba = host block #, relative to partition start
  44 ; Read/Write "hostsize" bytes to/from hostbuf
  45 ; --------------------------------------------------------------------
  46 ; Description:
  47 ; ====================================================================
  48
  49 cpm_hostparam:
  50         lds     zl,hostdsk
  51
  52 .if HOSTRW_DEBUG
  53         mov     temp,zl
  54         subi    temp,-('A')
  55         lcall   uartputc
  56         printstring ": "
  57 .endif
  58
  59         rcall dsk_getpartentry          ; get partition entry
  60
  61         lds     temp,hostlba            ; get sector to access
  62         lds     temp2,hostlba+1
  63
  64 .if HOSTRW_DEBUG
  65         printstring "lba: "
  66         push    r15
  67         push    r14
  68         clr     r14
  69         clr     r15
  70         lcall   print_ultoa
  71         pop     r14
  72         pop     r15
  73 .endif
  74
  75         ldd     xl,z+5                  ; get disksize
  76         ldd     xh,z+6
  77
  78         cp      temp,xl                 ; check given sector against disksize
  79         cpc     temp2,xh
  80         brcs    cpm_hp1
  81
  82 .if HOSTRW_DEBUG
  83         printstring ", max: "
  84         push    r15
  85         push    r14
  86         push    temp2
  87         push    temp
  88         movw    temp,x
  89         clr     r14
  90         clr     r15
  91         lcall   print_ultoa
  92         pop     temp
  93         pop     temp2
  94         pop     r14
  95         pop     r15
  96         printstring " "
  97 .endif
  98
  99         clr     temp
 100         ret
 101
 102 cpm_hp1:
 103         ldd     xl,z+1                  ; get startsector of partition
 104         ldd     xh,z+2
 105         ldd     yl,z+3
 106         ldd     yh,z+4
 107
 108         add     xl,temp                 ; add offset to startsector
 109         adc     xh,temp2
 110         adc     yl,_0
 111         adc     yh,_0
 112
 113 .if HOSTRW_DEBUG
 114         printstring ", abs:"
 115         push    r15
 116         push    r14
 117         push    temp2
 118         push    temp
 119         movw    temp,x
 120         movw    r14,y
 121         lcall   print_ultoa
 122         pop     temp
 123         pop     temp2
 124         pop     r14
 125         pop     r15
 126         printstring " "
 127 .endif
 128
 129         ori     temp,255
 130 cpm_hpex:
 131         ret
 132
 133 ; ====================================================================
 134 ; Function: Does a Disk write operation
 135 ; ====================================================================
 136 ; Parameters
 137 ; --------------------------------------------------------------------
 138 ; Registers  : none
 139 ; Variables  : [r] seekdsk              Number of Disk to Read
 140 ;                          [r] seeksec          Sector to read
 141 ;              [r] seektrk              Track  to read
 142 ; --------------------------------------------------------------------
 143 ; Description:
 144 ; ====================================================================
 145
 146 cpm_writehost:
 147 .if HOSTRW_DEBUG
 148         printnewline
 149         printstring "host write "
 150 .endif
 151         rcall   cpm_hostparam
 152         breq    cpm_rdwr_err
 153
 154         rcall   mmcWriteSect
 155         tst     temp
 156         brne    cpm_rdwr_err
 157
 158         rjmp    cpm_rdwr_ok
 159
 160
 161 ; ====================================================================
 162 ; Function: Does a Disk read operation
 163 ; ====================================================================
 164 ; Parameters
 165 ; --------------------------------------------------------------------
 166 ; Registers  : none
 167 ; Variables  : [r] seekdsk              Number of Disk to Read
 168 ;              [r] seeksec              Sector to read
 169 ;              [r] seektrk              Track  to read
 170 ; --------------------------------------------------------------------
 171 ; Description:
 172 ; ====================================================================
 173 cpm_readhost:
 174 .if HOSTRW_DEBUG
 175         printnewline
 176         printstring "host read  "
 177 .endif
 178
 179         rcall   cpm_hostparam
 180         breq    cpm_rdwr_err
 181
 182         rcall   mmcReadSect
 183         tst     temp
 184         brne    cpm_rdwr_err
 185
 186 cpm_rdwr_ok:
 187         sts     erflag,_0
 188         ret
 189
 190 cpm_rdwr_err:
 191         sts     erflag,_255
 192         ret
 193
 194
 195 ; ====================================================================
 196 ; Function: Add's a CP/M Partition to the Partition table
 197 ; ====================================================================
 198 ; Parameters
 199 ; --------------------------------------------------------------------
 200 ; Registers  : none
 201 ; Variables  : [r] seekdsk              Number of Disk to Read
 202 ;              [r] seeksec              Sector to read
 203 ;              [r] seektrk              Track  to read
 204 ; --------------------------------------------------------------------
 205 ; Description:
 206 ; ====================================================================
 207 cpm_add_partition:
 208
 209         ldi     temp,dskType_CPM
 210         std     y+0,temp
 211
 212         ldd     temp,z+PART_START
 213         std     y+1,temp
 214         ldd     temp,z+PART_START+1
 215         std     y+2,temp
 216         ldd     temp,z+PART_START+2
 217         std     y+3,temp
 218         ldd     temp,z+PART_START+3
 219         std     y+4,temp
 220
 221         ldd     temp,z+PART_SIZE+2
 222         ldd     temp2,z+PART_SIZE+3
 223         or      temp,temp2              ;part size larger than 65535 sectors?
 224         brne    cpm_add_prune
 225
 226         ldd     temp,z+PART_SIZE
 227         std     y+5,temp
 228         ldd     temp,z+PART_SIZE+1
 229         std     y+6,temp
 230         rjmp    cpm_add_e
 231
 232 cpm_add_prune:
 233         std     y+5,_255
 234         std     y+6,_255
 235
 236 cpm_add_e:
 237         ret
 238
 239 #endif
 240
 241 ; vim:set ts=8 noet nowrap
 242