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Patched VMB.EXE to support boot block booting with the same logic that all of the ROM based VMB systems (MicroVAX I onward) handle interpreting the boot block. Many alternate operating system installation media assumes that all VAX boot logic works this way.

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This commit is contained in:
Mark Pizzolato 2013-03-24 12:37:35 -07:00
parent 8116b7571d
commit e8667e4f1d
4 changed files with 167 additions and 15 deletions
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152
VAX/VMB-exe-Patch.com Normal file
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@ -0,0 +1,152 @@
$!
$! This procedure patches the VMB.EXE provided with VAX/VMS V7.3 to
$! support the Boot Block boot functionality provided on all VAX
$! systems which run a ROM based VMB.
$!
$ PATCH /ABSOLUTE /NEW_VERSION /OUTPUT=cp$exe:VMB.EXE cp$src:VMB_orig.EXE
! The native VMB.EXE program historically supported a Boot Block oriented
! boot if Bit 3 of the parameter register (R5) was set when VMB was invoked.
! This Boot Block boot operation reads sector 0 into memory and starts
! execution at offset 2 of the data block in memory.
! When portitions of VMB were migrated into ROM to support the earliest
! MicroVAX system (MicroVAX I) and all subsequent ROM based VMB versions
! the concept of Boot Block booting was extended in these ROM VMB
! implementations. The change in boot block booting functionality included
! several features:
! 1) If a normal boot attempt to a device failed (due to VMB not being
! able to locate a secondary bootstrap program), a boot block boot is
! automatically attempted. If the Bit 3 of R5 was set, then the
! initial search for a secondary boot block was avoided and a boot
! block boot was immediately attempted.
! 2) When performing a boot block boot, the sector 0 contents are examined
! and if these contents conform to the pattern defined for ROM based
! (PRA0) booting, the ROM format Offset, Size, and Starting address
! information is used directly by VMB to load a program into memory
! and control is transferred to that program. If the contents of
! sector 0 do not fit the pattern required for ROM based booting, then
! the code in sector 0 is executed directly starting at offset 2,
! the same as was originally done with the non ROM based VMB versions.
! Note that this extended behavior allows sector 0 to contain very little
! information and quite possibly no actual boot code.
! Developers of alternate operating systems for VAX computers noticed the ROM
! based boot block behavior and changed their installation media AND the disk
! structures to only provide the minimal boot information required on the
! systems with VMB installed in ROM.
!
! Since, when this active development of these alternate operating systems for
! VAX computers was happening, the vast majority of development and new system
! deployments were to hardware which had ROM base VMB, no one noticed that
! older systems which booted with the non ROM based VMB could no longer boot
! from new install media or disks formatted with these operating systems.
!
! This patch addeds the ROM based VMB boot block boot functionality to the
! original dynamically loaded VMB.EXE used by the older systems to boot.
!
! The patch overwrites some VMB code which exists to support NVAX(1302) and
! Neon-V(1701) systems. If simh simulators for these systems are ever built
! an alternate location must be found to accomodate this extended logic
!
define PAA = 08190 ! INIT_ADP_1302 (I think!)
define NEWFIL_OPNERR = PAA+1F ! Replacement to generate File Not Found Error Message
define TRY_BBLOCK = PAA+2B
define OLDFIL_OPNERR = 69A8 ! Original File Not Found Error
define ORIG_BBLOCK_BOOT = 68B6 ! Original code that did Boot Block Boot
define RPB$V_BBLOCK = 3
define RPB$L_BOOTR5 = 30
define READFILE = 0120
define READIN_BOOT = 6A37
define START_SECOND_HALT = 00BB
define SS$_FILESTRUCT = 08C0
define SS$_BADCHKSUM = 0808
define SS$_BADFILEHDR = 0810
define SS$_BADDIRECTORY = 0828
dep /long PAA = 0
dep /long PAA+04 = 0
dep /long PAA+08 = 0
dep /long PAA+0C = 0
dep /long PAA+10 = 0
dep /long PAA+14 = 0
dep /long PAA+18 = 0
dep /long PAA+1C = 0
dep /long PAA+20 = 0
dep /long PAA+24 = 0
dep /long PAA+28 = 0
dep /long PAA+2C = 0
dep /long PAA+30 = 0
dep /long PAA+34 = 0
dep /long PAA+38 = 0
dep /long PAA+3C = 0
dep /long PAA+40 = 0
dep /long PAA+44 = 0
dep /long PAA+48 = 0
dep /long PAA+4C = 0
dep /long PAA+50 = 0
dep /long PAA+54 = 0
dep /long PAA+58 = 0
dep /long PAA+5C = 0
dep /long PAA+60 = 0
dep /long PAA+64 = 0
dep /long PAA+68 = 0
dep /long PAA+6C = 0
dep /long PAA+70 = 0
dep /long PAA+74 = 0
dep /long PAA+78 = 0
dep /long PAA+8C = 0
dep /long PAA+80 = 0
dep /long PAA+84 = 0
dep /long PAA+88 = 0
dep /long PAA+8C = 0
dep /long PAA+90 = 0
dep /long PAA+94 = 0
dep /long PAA+98 = 0
dep /long PAA+9C = 0
dep /ins OLDFIL_OPNERR = ' BRW PAA '
dep /ins PAA = ' CMPW R0, #SS$_BADCHKSUM '
dep /ins PAA+05 = ' BEQL TRY_BBLOCK '
dep /ins PAA+07 = ' CMPW R0, #SS$_FILESTRUCT '
dep /ins PAA+0C = ' BEQL TRY_BBLOCK '
dep /ins PAA+0E = ' CMPW R0, #SS$_BADFILEHDR '
dep /ins PAA+13 = ' BEQL TRY_BBLOCK '
dep /ins PAA+15 = ' CMPW R0, #SS$_BADDIRECTORY '
dep /ins PAA+1A = ' BEQL TRY_BBLOCK '
dep /ins PAA+1C = ' BRW NEWFIL_OPNERR '
dep /ins NEWFIL_OPNERR = ' PUSHAB L^000069AE '
dep /ins NEWFIL_OPNERR+6 = ' JMP L^00000294 '
dep /ins TRY_BBLOCK
' CLRL R8 ' ! Block to read
' MOVL #1,R9 ' ! Size to read
' MOVL R10,R6 ' ! Start of free memory
' JSB L^READFILE ' ! Read the block to R10
' BLBC R0,TRY_OLD_BBLOCK ' ! Br if error
!
! validate the boot block
!
' MOVZBL B^2(R10),R2 ' ! Get offset to secondary id field
' CMPB B^3(R10),#1 ' ! Next field a BR instruction
' BNEQ TRY_OLD_BBLOCK ' ! Br if no
' MOVAW (R10)[R2],R1 ' ! Address next field
' CMPW (R1),#^x18 ' ! VAX instruction set id?
' BNEQ TRY_OLD_BBLOCK ' ! Br if no, error
' ADDB3 #^x18,B^2(R1),R2 ' ! Get optional value
' MCOMB R2,R2 ' ! Ones's complement it
' CMPB R2,B^3(R1) ' ! Check the check sum byte
' BNEQ TRY_OLD_BBLOCK ' ! Continue if no match
' ADDL3 B^8(R1),B^0C(R1),R2 ' ! Check other words
' ADDL B^10(R1),R2 ' ! Get augment to load address
' CMPL R2,B^14(R1) ' ! Match?
' BNEQ TRY_OLD_BBLOCK ' ! Br if no
' ROTL #10,B^4(R10),R8 ' ! Get secondary image LBN
' MOVL B^8(R1),R9 ' ! Get image size
' ADDL B^0C(R1),R10 ' ! Compute load address
' MOVL B^10(R1),R5 ' ! Compute transfer offset
' BRW READIN_BOOT ' ! Boot block is valid, read file
'TRY_OLD_BBLOCK:BBS #RPB$V_BBLOCK,B^RPB$L_BOOTR5(R11),OLD_BBLOCK_BOOT'
' BRW NEWFIL_OPNERR ' ! Report error
'OLD_BBLOCK_BOOT:MOVL #2,R5 ' ! Transfer address from start of block
' JMP L^START_SECOND_HALT ' ! Do it.
exit
dep /ins ORIG_BBLOCK_BOOT = ' BRW TRY_BBLOCK ' ! make BOOT /R5:8 work the same way
update
exit

28
VAX/vax_vmb_exe.h
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@ -1,9 +1,9 @@
#ifndef ROM_vax_vmb_exe_H
#define ROM_vax_vmb_exe_H 0
/*
VAX/vax_vmb_exe.h produced at Fri Nov 09 06:40:16 2012
from VAX/vmb.exe which was last modified at Sun Oct 21 17:12:55 2012
file size: 44544 (0xAE00) - checksum: 0xFFC014CC
VAX/vax_vmb_exe.h produced at Sun Mar 24 11:44:18 2013
from VAX/vmb.exe which was last modified at Sun Mar 24 11:32:59 2013
file size: 44544 (0xAE00) - checksum: 0xFFC013E0
This file is a generated file and should NOT be edited or changed by hand.
*/
#define BOOT_CODE_SIZE 0xAE00
@ -1700,7 +1700,7 @@ unsigned char vax_vmb_exe[] = {
0x12,0x29,0x95,0xCF,0xDB,0x0D,0x13,0x0B,0x94,0xCF,0xD5,0x0D,0x91,0x30,0xCF,0xD4,
0x0D,0x13,0xA2,0xE1,0x08,0xAB,0x30,0x13,0x7C,0x7E,0x9F,0xCF,0x68,0x0D,0xFB,0x03,
0xCF,0x7D,0xE8,0x90,0x04,0xCF,0xB9,0x0D,0x31,0x35,0xFF,0xB1,0x8F,0x08,0x09,0x50,
0x12,0x06,0x17,0xEF,0x58,0x97,0xFF,0xFF,0x16,0xEF,0xE6,0x98,0xFF,0xFF,0x25,0x42,
0x12,0x06,0x17,0xEF,0x58,0x97,0xFF,0xFF,0x31,0xE5,0x17,0x98,0xFF,0xFF,0x25,0x42,
0x4F,0x4F,0x54,0x2D,0x46,0x2D,0x55,0x6E,0x61,0x62,0x6C,0x65,0x20,0x74,0x6F,0x20,
0x6C,0x6F,0x63,0x61,0x74,0x65,0x20,0x42,0x4F,0x4F,0x54,0x20,0x66,0x69,0x6C,0x65,
0x00,0x7D,0xAB,0x3C,0x58,0xE0,0x01,0xAC,0x2C,0x2A,0xD5,0x58,0x12,0x26,0x16,0xEF,
@ -2083,16 +2083,16 @@ unsigned char vax_vmb_exe[] = {
0x00,0x14,0x20,0xD0,0xA0,0x10,0xA0,0x10,0xD0,0x8F,0x00,0xE0,0xFF,0x0F,0xA0,0x04,
0xD0,0xA0,0x10,0xA0,0x10,0xDA,0x00,0x26,0x7D,0x8E,0x50,0x17,0xBE,0x00,0xD0,0x8F,
0x00,0x00,0x80,0x21,0x54,0x9E,0xAF,0x8C,0x51,0x30,0x94,0xF9,0x05,0x00,0x00,0x00,
0xDE,0x9F,0x00,0x00,0x80,0xE1,0x50,0xDE,0x9F,0x00,0x00,0x00,0xE0,0x53,0x30,0x7A,
0xFA,0x05,0xDE,0x9F,0x00,0x00,0x80,0xE1,0x52,0x30,0xA2,0xFB,0x05,0xDD,0x54,0xDE,
0x9F,0x00,0x00,0x00,0xE0,0x54,0x30,0x3C,0xFC,0xD0,0x8E,0x54,0x05,0xBB,0x04,0xD0,
0x8F,0x00,0x00,0x80,0xE1,0x50,0xD0,0x8F,0x00,0x00,0x00,0xE0,0x51,0x9E,0xEF,0x09,
0x00,0x00,0x00,0x52,0x30,0xBA,0xFA,0xBA,0x04,0x05,0x00,0x00,0xC0,0x24,0x5E,0x7D,
0x50,0x7E,0xEF,0x00,0x04,0x9F,0x40,0x00,0x14,0xE0,0x50,0xC4,0x8F,0x00,0x00,0x08,
0x00,0x50,0xC0,0x8F,0x00,0x00,0x80,0xE1,0x50,0xDA,0x8F,0xE0,0x00,0x00,0x00,0x8F,
0x7F,0x00,0x00,0x00,0xDA,0x8F,0xF6,0x01,0x00,0x00,0x8F,0x71,0x00,0x00,0x00,0xDB,
0x8F,0x7B,0x00,0x00,0x00,0x51,0xC8,0x8F,0xFE,0x00,0x00,0x00,0x51,0xDA,0x51,0x8F,
0x7B,0x00,0x00,0x00,0xD0,0x8F,0x00,0x00,0x00,0xC0,0x9F,0x20,0x00,0x14,0xE0,0xD0,
0xB1,0x50,0x8F,0x08,0x08,0x13,0x24,0xB1,0x50,0x8F,0xC0,0x08,0x13,0x1D,0xB1,0x50,
0x8F,0x10,0x08,0x13,0x16,0xB1,0x50,0x8F,0x28,0x08,0x13,0x0F,0x31,0x00,0x00,0x9F,
0xEF,0xF9,0xE7,0xFF,0xFF,0x17,0xEF,0xD9,0x80,0xFF,0xFF,0xD4,0x58,0xD0,0x01,0x59,
0xD0,0x5A,0x56,0x16,0xEF,0x57,0x7F,0xFF,0xFF,0xE9,0x50,0x45,0x9A,0xAA,0x02,0x52,
0x91,0xAA,0x03,0x01,0x12,0x3B,0x3E,0x42,0x6A,0x51,0xB1,0x61,0x18,0x12,0x32,0x81,
0x18,0xA1,0x02,0x52,0x92,0x52,0x52,0x91,0x52,0xA1,0x03,0x12,0x24,0xC1,0xA1,0x08,
0xA1,0x0C,0x52,0xC0,0xA1,0x10,0x52,0xD1,0x52,0xA1,0x14,0x12,0x14,0x9C,0x10,0xAA,
0x04,0x58,0xD0,0xA1,0x08,0x59,0xC0,0xA1,0x0C,0x5A,0xD0,0xA1,0x10,0x55,0x31,0x26,
0xE8,0xE0,0x03,0xAB,0x30,0x03,0x31,0x96,0xFF,0xD0,0x02,0x55,0x17,0xEF,0x99,0x7E,
0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x8F,0x07,0xFF,0xFF,0xEF,0xA0,0x34,0xD0,0x8F,0x00,0xA0,0xFF,0x0B,0xA0,0x04,0xDA,
0x00,0x26,0x7D,0x8E,0x50,0x17,0xBE,0x00,0xD0,0x8F,0x00,0x00,0x80,0xE1,0x54,0x9E,
0xAF,0x8A,0x51,0x30,0xCA,0xF8,0x05,0x00,0xDE,0x9F,0x00,0x00,0x80,0xE1,0x50,0xDE,

BIN
VAX/vmb.exe
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Binary file not shown.

2
sim_BuildROMs.c
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@ -43,7 +43,7 @@ struct ROM_File_Descriptor {
{"VAX/ka620.bin", "VAX/vax_ka620_bin.h", 65536, 0xFF7F930F, "vax_ka620_bin"},
{"VAX/ka630.bin", "VAX/vax_ka630_bin.h", 65536, 0xFF7F73EF, "vax_ka630_bin"},
{"VAX/ka610.bin", "VAX/vax_ka610_bin.h", 16384, 0xFFEF3312, "vax_ka610_bin"},
{"VAX/vmb.exe", "VAX/vax_vmb_exe.h", 44544, 0xFFC014CC, "vax_vmb_exe"},
{"VAX/vmb.exe", "VAX/vax_vmb_exe.h", 44544, 0xFFC014BB, "vax_vmb_exe"}
};