1: MAJOR = 10.                     / major # from bdevsw[]
   2: 
   3: / RM02/03/05 bootstrap
   4: /
   5: / 1995/05/31 - The unit number needs to go in bits 3-5 of bootdev
   6: /	       because the partition number now goes into bits 0-2.
   7: /
   8: / disk boot program to load and transfer
   9: / to a unix entry.
  10: / for use with 1 KB byte blocks, CLSIZE is 2.
  11: / NDIRIN is the number of direct inode addresses (currently 4)
  12: / assembled size must be <= 512; if > 494, the 16-byte a.out header
  13: / must be removed
  14: 
  15: RM05    = 1             / 0-> RM02/03, 1-> RM05
  16: 
  17: / options: none.  all options of reading an alternate name or echoing to
  18: /		  the keyboard had to be removed to make room for the
  19: /		  code which understands the new directory structure on disc
  20: 
  21: / constants:
  22: CLSIZE  = 2.                    / physical disk blocks per logical block
  23: CLSHFT  = 1.                    / shift to multiply by CLSIZE
  24: BSIZE   = 512.*CLSIZE           / logical block size
  25: INOSIZ  = 64.                   / size of inode in bytes
  26: NDIRIN  = 4.                    / number of direct inode addresses
  27: ADDROFF = 12.                   / offset of first address in inode
  28: INOPB   = BSIZE\/INOSIZ         / inodes per logical block
  29: INOFF   = 31.                   / inode offset = (INOPB * (SUPERB+1)) - 1
  30: PBSHFT  = -4                    / shift to divide by inodes per block
  31: WC      = -256.*CLSIZE          / word count
  32: 
  33: /  The boot options and device are placed in the last SZFLAGS bytes
  34: /  at the end of core by the kernel for autobooting.
  35: ENDCORE=        160000          / end of core, mem. management off
  36: SZFLAGS=        6               / size of boot flags
  37: BOOTOPTS=       2               / location of options, bytes below ENDCORE
  38: BOOTDEV=        4
  39: CHECKWORD=      6
  40: 
  41: .. = ENDCORE-512.-SZFLAGS       / save room for boot flags
  42: 
  43: / entry is made by jsr pc,*$0
  44: / so return can be rts pc
  45: 
  46: / establish sp, copy
  47: / program up to end of core.
  48: 
  49:         nop                     / These two lines must be present or DEC
  50:         br      start           / boot ROMs will refuse to run boot block!
  51: start:
  52:         mov     r0,unit
  53:         mov     r1,csr
  54:         mov     $..,sp
  55:         mov     sp,r1
  56:         clr     r0
  57: 1:
  58:         mov     (r0)+,(r1)+
  59:         cmp     r1,$end
  60:         blo     1b
  61:         jmp     *$2f
  62: 
  63: / On error, restart from here.
  64: restart:
  65:         clr     r0
  66: / clear core to make things clean
  67: 2:
  68:         clr     (r0)+
  69:         cmp     r0,sp
  70:         blo     2b
  71: 
  72: / initialize disk
  73:         mov     csr,r1
  74:         mov     unit,rmcs2(r1)
  75:         mov     $preset+go,rmcs1(r1)
  76:         mov     $fmt22,rmof(r1)
  77: 
  78:         mov     $bootnm, r1
  79:         mov     $2,r0                   / ROOTINO
  80:         jsr     pc,iget
  81:         clr     r2                      / offset
  82: again:
  83:         jsr     pc,readdir
  84:         beq     restart                 / error - restart
  85:         mov     4(r0),r4                / dp->d_namlen
  86:         cmp     r4,$bootlen             / if (bootlen == dp->d_namlen)
  87:         bne     again                   /    nope, go try next entry
  88:         mov     r0,r3
  89:         add     $6,r3                   / r3 = dp->d_name
  90:         mov     r1,r5                   / r5 = filename
  91: 9:
  92:         cmpb    (r3)+,(r5)+
  93:         bne     again                   / no match - go read next entry
  94:         sob     r4,9b
  95:         mov     (r0),r0                 / r0 = dp->d_ino
  96:         jsr     pc,iget                 / fetch boot's inode
  97:         br      loadfile                / 'boot'- go read it
  98: 
  99: / get the inode specified in r0
 100: iget:
 101:         add     $INOFF,r0
 102:         mov     r0,r5
 103:         ash     $PBSHFT,r0
 104:         bic     $!7777,r0
 105:         mov     r0,dno
 106:         clr     r0
 107:         jsr     pc,rblk
 108:         bic     $!17,r5
 109:         mov     $INOSIZ,r0
 110:         mul     r0,r5
 111:         add     $buf,r5
 112:         mov     $inod,r4
 113: 1:
 114:         movb    (r5)+,(r4)+
 115:         sob     r0,1b
 116:         rts     pc
 117: 
 118: readdir:
 119:         bit     $BSIZE-1,r2
 120:         bne     1f
 121:         jsr     pc,rmblk                / read mapped block (bno)
 122:                 br err                  / end of file branch
 123:         clr     r2                      / start at beginning of buf
 124: 1:
 125:         mov     $buf,r0
 126:         add     r2,r0                   / dp = buf+offset
 127:         add     buf+2(r2),r2            / dp += dp->d_reclen
 128:         tst     (r0)                    / dp->d_ino == 0?
 129:         beq     readdir                 / yes - go look at next
 130:         rts     pc                      / return with r0 = &dp->d_ino
 131: err:
 132:         clr     r0                      / return with
 133:         rts     pc                      / dp = NULL
 134: 
 135: loadfile:
 136:         clr     bno                     / start at block 0 of inode in 'inod'
 137: / read file into core until
 138: / a mapping error, (no disk address)
 139:         clr     r1
 140: 1:
 141:         jsr     pc,rmblk
 142:                 br 1f
 143:         mov     $buf,r2
 144: 2:
 145:         mov     (r2)+,(r1)+
 146:         cmp     r2,$buf+BSIZE
 147:         blo     2b
 148:         br      1b
 149: / relocate core around
 150: / assembler header
 151: 1:
 152:         clr     r0
 153:         cmp     (r0),$407
 154:         bne     2f
 155: 1:
 156:         mov     20(r0),(r0)+
 157:         cmp     r0,sp
 158:         blo     1b
 159: / enter program and
 160: / restart if return
 161: 2:
 162:         mov     ENDCORE-BOOTOPTS, r4
 163:         mov     unit,r3
 164:         ash     $3,r3                   / unit # in bits 3-5, partition # is 0
 165:         bis     $MAJOR\<8.,r3
 166:         mov     ENDCORE-CHECKWORD, r2
 167:         mov     csr,r1
 168:         jsr     pc,*$0
 169:         br      restart
 170: 
 171: / read a mapped block
 172: / offset in file is in bno.
 173: / skip if success, no skip if fail
 174: / the algorithm only handles a single
 175: / indirect block. that means that
 176: / files longer than NDIRIN+256 blocks (260kb) cannot
 177: / be loaded.
 178: rmblk:
 179:         add     $2,(sp)
 180:         mov     bno,r0
 181:         cmp     r0,$NDIRIN
 182:         blt     1f
 183:         mov     $NDIRIN,r0
 184: 1:
 185:         ash     $2,r0
 186:         mov     addr+2(r0),dno
 187:         mov     addr(r0),r0
 188:         bne     1f
 189:         tst     dno
 190:         beq     2f
 191: 1:
 192:         jsr     pc,rblk
 193:         mov     bno,r0
 194:         inc     bno
 195:         sub     $NDIRIN,r0
 196:         blt     1f
 197:         ash     $2,r0
 198:         mov     buf+2(r0),dno
 199:         mov     buf(r0),r0
 200:         bne     rblk
 201:         tst     dno
 202:         bne     rblk
 203: 2:
 204:         sub     $2,(sp)
 205: 1:
 206:         rts     pc
 207: 
 208: read    = 70
 209: preset  = 20
 210: go      = 1
 211: fmt22   = 10000
 212: NSECT   = 32.
 213: .if     RM05
 214: NTRAK   = 19.           / RM05
 215: .endif
 216: .if     RM05-1
 217: NTRAK   = 5.            / RM02/03
 218: .endif
 219: 
 220: rmcs1   = 0
 221: rmda    = rmcs1+6
 222: rmcs2   = rmcs1+10
 223: rmds    = rmcs1+12
 224: rmof    = rmcs1+32
 225: rmca    = rmcs1+34
 226: 
 227: / rm02/3/5 disk driver.
 228: / low order address in dno,
 229: / high order in r0.
 230: rblk:
 231:         mov     r1,-(sp)
 232:         mov     dno,r1
 233: .if     CLSIZE-1
 234:         ashc    $CLSHFT,r0              / multiply by CLSIZE
 235: .endif
 236:         div     $NSECT*NTRAK,r0
 237:         mov     csr,r3
 238:         mov     r0,rmca(r3)
 239:         clr     r0
 240:         div     $NSECT,r0
 241:         swab    r0
 242:         bis     r1,r0
 243:         add     $rmcs2,r3
 244:         mov     unit,(r3)
 245:         mov     r0,-(r3)
 246:         mov     $buf,-(r3)
 247:         mov     $WC,-(r3)
 248:         mov     $read+go,-(r3)
 249: 1:
 250:         tstb    (r3)
 251:         bge     1b
 252:         mov     (sp)+,r1
 253:         rts     pc
 254: 
 255: bootnm: <boot\0\0>
 256: bootlen = 4                     / strlen(bootnm)
 257: unit: 0
 258: csr: 0
 259: end:
 260: 
 261: inod = ..-512.-BSIZE            / room for inod, buf, stack
 262: addr = inod+ADDROFF             / first address in inod
 263: buf = inod+INOSIZ
 264: bno = buf+BSIZE
 265: dno = bno+2

Defined functions

ADDROFF defined in line 27; used 1 times
BOOTDEV defined in line 38; never used
BOOTOPTS defined in line 37; used 1 times
BSIZE defined in line 24; used 5 times
CHECKWORD defined in line 39; used 1 times
CLSHFT defined in line 23; used 1 times
CLSIZE defined in line 22; used 3 times
ENDCORE defined in line 35; used 3 times
INOFF defined in line 29; used 1 times
INOPB defined in line 28; never used
INOSIZ defined in line 25; used 3 times
MAJOR defined in line 1; used 1 times
NDIRIN defined in line 26; used 3 times
NSECT defined in line 212; used 2 times
NTRAK defined in line 217; used 1 times
PBSHFT defined in line 30; used 1 times
RM05 defined in line 15; used 2 times
SZFLAGS defined in line 36; used 1 times
  • in line 41
WC defined in line 31; used 1 times
addr defined in line 262; used 2 times
again defined in line 82; used 2 times
bno defined in line 264; used 5 times
bootlen defined in line 256; used 1 times
  • in line 86
bootnm defined in line 255; used 1 times
  • in line 78
buf defined in line 263; used 9 times
csr defined in line 258; used 4 times
dno defined in line 265; used 6 times
end defined in line 259; used 1 times
  • in line 59
err defined in line 131; used 1 times
fmt22 defined in line 211; used 1 times
  • in line 76
go defined in line 210; used 2 times
iget defined in line 100; used 2 times
inod defined in line 261; used 3 times
loadfile defined in line 135; used 1 times
  • in line 97
preset defined in line 209; used 1 times
  • in line 75
rblk defined in line 230; used 4 times
read defined in line 208; used 1 times
readdir defined in line 118; used 2 times
restart defined in line 64; used 2 times
rmblk defined in line 178; used 2 times
rmca defined in line 225; used 1 times
rmcs1 defined in line 220; used 6 times
rmcs2 defined in line 222; used 2 times
rmda defined in line 221; never used
rmds defined in line 223; never used
rmof defined in line 224; used 1 times
  • in line 76
start defined in line 51; used 1 times
  • in line 50
unit defined in line 257; used 4 times
Last modified: 1995-06-01
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