# 2.11BSD#431 - /usr/src/sys/conf/boot/dvhpboot.s

##### Functions

    _doboot           X

##### Variables

    hardboot          X

       1: /*
       2:  *	SCCS id	@(#)dvhpboot.s	2.0 (2.11BSD)	4/13/91
       3:  */
       4: #include "localopts.h"
       5:
       6: /  The boot options and device are placed in the last SZFLAGS bytes
       7: /  at the end of core for the bootstrap.
       8: ENDCORE=        160000          / end of core, mem. management off
       9: SZFLAGS=        6               / size of boot flags
      10: BOOTOPTS=       2               / location of options, bytes below ENDCORE
      11: BOOTDEV=        4               / boot unit
      12: CHECKWORD=      6
      13:
      14: .globl  _doboot, hardboot, _bootcsr
      15: .text
      16: _doboot:
      17:         mov     4(sp),r4        / boot options
      18:         mov     2(sp),r3        / boot device
      19:
      20: #ifndef KERN_NONSEP
      21: /  If running separate I/D, need to turn off memory management.
      22: /  Call the routine unmap in low text, after setting up a jump
      23: /  in low data where the PC will be pointing.
      24: .globl  unmap
      25:         mov     $137,*$unmap+2          / jmp *$hardboot
      26:         mov     $hardboot,*$unmap+4
      27:         jmp     unmap
      28:         / "return" from unmap will be to hardboot in data
      29: .data
      30: #else
      31: /  Reset to turn off memory management
      32:         reset
      33: #endif
      34:
      35: /  On power fail, hardboot is the entry point (map is already off)
      36: /  and the args are in r4 (RB_POWRFAIL), r3 (rootdev)
      37:
      38: hardboot:
      39:         mov     r4, ENDCORE-BOOTOPTS
      40:         ash     $-3,r3          / shift out the partition number
      41:         bic     $!7,r3          / save only the drive number
      42:         mov     r3, ENDCORE-BOOTDEV
      43:         com     r4              / if CHECKWORD == ~bootopts, flags are believed
      44:         mov     r4, ENDCORE-CHECKWORD
      45: 1:
      46:         reset
      47:
      48: /  The remainder of the code is dependent on the boot device.
      49: /  If you have a bootstrap ROM, just jump to the correct entry.
      50: /  Otherwise, use a BOOT opcode, if available;
      51: /  if necessary, read in block 0 to location 0 "by hand".
      52:
      53: /
      54: / Bootstrap for DIVA Comp/V controller without boot opcode
      55: /
      56: HPCSR=  0               / offset from base csr
      57: HPCS2=  10              / Control/status register 2
      58: HPDC=   34              / Desired cylinder
      59: HPBAE=  50              / Bus extension address (RH70)
      60: READIT= 71
      61:
      62:         mov     _bootcsr,r1     / boot device csr
      63: 1:
      64:         tstb    (r1)            / wait for ready (HPCSR is offset 0)
      65:         bpl     1b
      66:
      67:         clr     HPDC(r1)        / Cylinder 0
      68:         clr     HPBAE           / Bus extension address = 0
      69:         add     $HPCS2,r1
      70:         mov     ENDCORE-BOOTDEV,(r1)    / unit number
      71:         clr     -(r1)           / hpda = 0 (desired address 0)
      72:         clr     -(r1)           / hpba = 0 (buf address 0)
      73:         mov     $-256.,-(r1)    / hpwc = -256 (one block)
      74:         mov     $READIT,-(r1)   / hpcs1 = HP_RCOM|HP_GO
      75:
      76: 1:
      77:         tstb    (r1)            / wait for done
      78:         bpl     1b
      79:         mov     ENDCORE-BOOTDEV,r0
      80:         clr     pc

#### Defined functions

BOOTDEV defined in line 11; used 3 times

- in line 42, 70, 79

BOOTOPTS defined in line 10; used 1 times

- in line 39

CHECKWORD defined in line 12; used 1 times

- in line 44

ENDCORE defined in line 8; used 5 times

- in line 39-44(3), 70, 79

SZFLAGS defined in line 9; never used
_doboot declared in line 14; defined in line 16; used 1 times

- in line 14

#### Defined variables

HPBAE defined in line 59; used 1 times

- in line 68

HPCS2 defined in line 57; used 1 times

- in line 69

HPCSR defined in line 56; never used
HPDC defined in line 58; used 1 times

- in line 67

READIT defined in line 60; used 1 times

- in line 74

hardboot declared in line 14; defined in line 38; used 2 times

- in line 14, 26

Last modified: 1991-04-20 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 555 |