Create a bootstrap floppy

The floppy enables network boot in PRAM. This allows us to remove most
of the ROM patches.
This commit is contained in:
Elliot Nunn 2020-10-10 16:03:38 +08:00
parent c5a4b9e0eb
commit c6731715db
9 changed files with 121 additions and 45 deletions

3
.gitignore vendored
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@ -1,3 +1,6 @@
*.app *.app
edit.rom edit.rom
.DS_Store .DS_Store
BootstrapFloppy/System.rdump
Bootstrap.bin
BootstrapFloppy.dsk

99
Bootstrap.a Normal file
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; boot 1 resource
; assemble with vasmm68k_mot
dc.b "LK"
bra.w Code
dc.b "D" ; executable on all machines
dc.b $18 ; version number, unsure if important
dc.w 0 ; some flag thing
dc.b 6, 'System '
dc.b 6, 'Finder '
dc.b 7, 'MacsBug '
dc.b 12, 'Disassembler '
dc.b 13, 'StartUpScreen '
dc.b 6, 'Finder '
dc.b 9, 'Clipboard '
NumFCBs dc.w 10 ; number of FCBs to allocate at boot
NumEvents dc.w 20 ; number of event queue elements
SystemHeapSize128K dc.l $4300 ; size of system heap for 128K system (never used)
SystemHeapSize256K dc.l $8000 ; size of system heap for 256K system (never used)
SystemHeapSize dc.l $20000 ; size of system heap (used for pre-7.0)
; Okay, now we can ignore all of that crap and take control of the machine!
Code
lea bootVars,a0
lea pRamTable,a1
pramLoop
move.l (a1)+,d0
beq.s pramDone
move.l d0,d2 ; Save the len/offset arg for later
dc.w $A052 ; _WriteXPRam
swap d2 ; Get count from upper byte
add.w d2,a0 ; and add it to bootVars
bra.s pramLoop
pramDone
; all right, now reboot the machine
move.l $2AE,a0 ; ROMBase
cmp.b #0,8(A0)
beq.s rebootPlus
cmp.b #1,8(A0)
beq.s rebootII
cmp.b #2,8(A0)
beq.s rebootSE
cmp.b #3,8(A0)
beq.s rebootPortable
cmp.b #6,8(A0)
beq.s rebootIIci
; try our luck ... maybe it's a SuperMario?
move.w #1,-(sp) ; sdRestart
dc.w $A895 ; _ShutDown
rebootPlus jmp $B82(a0)
rebootII jmp $11AE(a0)
rebootSE jmp $A52(a0)
rebootPortable jmp $336E(a0)
rebootIIci jmp $203E(a0)
bootVars
; bootVars
dc.b 1 ; osType preferred os to boot from
dc.b 1 ; protocol preferred protocol to boot from = NBP
dc.b 0 ; errors last error in network booting
dc.b $80 ; flags flags for: never net boot, boot first, etc.
; bootVars ATPRAMrec
dc.b 0 ; nbpVars address of last server that we booted off of
dc.b 0 ; timeout seconds to wait for bootserver response
dcb.l 4, "PWD " ; signature image signature
dcb.b 32 ; userName an array of char, no length byte
dcb.b 8 ; password ditto
dc.w $8888 ; serverNum the server number
dcb.b 8 ; padding to 68b
pRamTable
dc.l $00040004
dc.l $000300AB
dc.l $000100BC
dc.l $00200020
dc.l $0020008B
dc.l $00000000
align 10 ; fill up the boot blocks

0
BootstrapFloppy/Finder Normal file
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FNDRMACS

0
BootstrapFloppy/System Normal file
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ZSYSMACS

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@ -19,3 +19,17 @@ image: systools607.dsk.a Makefile
systools607.dsk.a: systools607.dsk systools607.dsk.a: systools607.dsk
python3 -c 'for b in open("systools607.dsk","rb").read(): print(" dc.b $$%02X" % b)' >systools607.dsk.a python3 -c 'for b in open("systools607.dsk","rb").read(): print(" dc.b $$%02X" % b)' >systools607.dsk.a
Bootstrap.bin: Bootstrap.a
vasm-1/vasmm68k_mot -quiet -Fbin -pic -o $@ $<
BootstrapFloppy/System.rdump: Bootstrap.bin
rfx cp $< $@//boot/1
BootstrapFloppy.dsk: BootstrapFloppy/System.rdump
MakeHFS -n 'NetBoot Enabler' -i BootstrapFloppy -s 1440k -d now $@
testflop: BootstrapFloppy.dsk
Mini\ vMac\ Classic.app/Co*/Ma*/* xo.rom $<

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trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT
./NetBoot.py & cp xo.rom edit.rom && ./xo-rom-enable-netboot.py edit.rom && Mini\ vMac\ Classic.app/Contents/MacOS/minivmac edit.rom && kill %1 make BootstrapFloppy.dsk
./NetBoot.py & cp xo.rom edit.rom && ./xo-rom-enable-netboot.py edit.rom && Mini\ vMac\ Classic.app/Contents/MacOS/minivmac edit.rom BootstrapFloppy.dsk && kill %1

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@ -24,50 +24,6 @@ def write_asm(f, asm):
with open(sys.argv[1], 'r+b') as f: with open(sys.argv[1], 'r+b') as f:
# Skip the initial PRAM check in forXO.a:InstallNetBoot
f.seek(0x1d928)
while f.tell() < 0x1D982:
f.write(b'Nq') # nop
# Find a safe place to store our overridden NetBoot config struct
# (Which would otherwise be cobbled from various parts of PRAM)
garbage_location = 0x67046 # The MacsBug copyright string in the ROM Disk
# Make out own structure, as adapted from NetBoot.h
the_netboot_structure = struct.pack('>BBBB BB 16s 32s 8s H', # Note that "int"s are 4 bytes, somehow!
# First 4 bytes at PRAM+4
1, # char osType; /* preferred os to boot from */
1, # char protocol; /* preferred protocol to boot from */
0, # char errors; /* last error in network booting */
0x80, # char flags; /* flags for: never net boot, boot first, etc. */
# Now, the AppleTalk-protocol-specific part
0, # unsigned char nbpVars; /* address of last server that we booted off of */
0, # unsigned char timeout; /* seconds to wait for bootserver response */
b'PWD PWD PWD PWD ', # unsigned int signature[4]; /* image signature */ Elliot notes: zeroes match anything!
b'Elliot', # char userName[31]; /* an array of char, no length byte */
b'volapuk', # char password[8]; /* '' */
0xBABE, # short serverNum; /* the server number */
).ljust(72, b'\0')
# the_netboot_structure = bytearray(the_netboot_structure)
# for i, j in enumerate(range(54, len(the_netboot_structure))):
# the_netboot_structure[j] = i
# This is the guts of the NetBoot ReadPRAM procedure
f.seek(0x1DF08)
write_asm(f, f'''
move.l a0,a1
move.l 0x2ae,a0 ; RomBase
add.l #{hex(garbage_location)},a0
move.l #{hex(len(the_netboot_structure))},d0
.2byte 0xA02E ; BlockMove
rts
''')
f.seek(garbage_location)
f.write(the_netboot_structure)
# I have implemented Snefru, so this is no longer needed: # I have implemented Snefru, so this is no longer needed:
# Do the dodgy... cancel signature validation! # Do the dodgy... cancel signature validation!
# f.seek(0x21A84) # f.seek(0x21A84)