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https://github.com/elliotnunn/NetBoot.git
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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
parent
c5a4b9e0eb
commit
c6731715db
3
.gitignore
vendored
3
.gitignore
vendored
@ -1,3 +1,6 @@
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*.app
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edit.rom
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.DS_Store
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BootstrapFloppy/System.rdump
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Bootstrap.bin
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BootstrapFloppy.dsk
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99
Bootstrap.a
Normal file
99
Bootstrap.a
Normal file
@ -0,0 +1,99 @@
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; boot 1 resource
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; assemble with vasmm68k_mot
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dc.b "LK"
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bra.w Code
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dc.b "D" ; executable on all machines
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dc.b $18 ; version number, unsure if important
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dc.w 0 ; some flag thing
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dc.b 6, 'System '
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dc.b 6, 'Finder '
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dc.b 7, 'MacsBug '
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dc.b 12, 'Disassembler '
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dc.b 13, 'StartUpScreen '
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dc.b 6, 'Finder '
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dc.b 9, 'Clipboard '
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NumFCBs dc.w 10 ; number of FCBs to allocate at boot
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NumEvents dc.w 20 ; number of event queue elements
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SystemHeapSize128K dc.l $4300 ; size of system heap for 128K system (never used)
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SystemHeapSize256K dc.l $8000 ; size of system heap for 256K system (never used)
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SystemHeapSize dc.l $20000 ; size of system heap (used for pre-7.0)
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; Okay, now we can ignore all of that crap and take control of the machine!
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Code
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lea bootVars,a0
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lea pRamTable,a1
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pramLoop
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move.l (a1)+,d0
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beq.s pramDone
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move.l d0,d2 ; Save the len/offset arg for later
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dc.w $A052 ; _WriteXPRam
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swap d2 ; Get count from upper byte
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add.w d2,a0 ; and add it to bootVars
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bra.s pramLoop
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pramDone
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; all right, now reboot the machine
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move.l $2AE,a0 ; ROMBase
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cmp.b #0,8(A0)
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beq.s rebootPlus
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cmp.b #1,8(A0)
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beq.s rebootII
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cmp.b #2,8(A0)
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beq.s rebootSE
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cmp.b #3,8(A0)
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beq.s rebootPortable
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cmp.b #6,8(A0)
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beq.s rebootIIci
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; try our luck ... maybe it's a SuperMario?
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move.w #1,-(sp) ; sdRestart
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dc.w $A895 ; _ShutDown
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rebootPlus jmp $B82(a0)
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rebootII jmp $11AE(a0)
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rebootSE jmp $A52(a0)
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rebootPortable jmp $336E(a0)
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rebootIIci jmp $203E(a0)
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bootVars
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; bootVars
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dc.b 1 ; osType preferred os to boot from
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dc.b 1 ; protocol preferred protocol to boot from = NBP
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dc.b 0 ; errors last error in network booting
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dc.b $80 ; flags flags for: never net boot, boot first, etc.
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; bootVars ATPRAMrec
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dc.b 0 ; nbpVars address of last server that we booted off of
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dc.b 0 ; timeout seconds to wait for bootserver response
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dcb.l 4, "PWD " ; signature image signature
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dcb.b 32 ; userName an array of char, no length byte
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dcb.b 8 ; password ditto
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dc.w $8888 ; serverNum the server number
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dcb.b 8 ; padding to 68b
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pRamTable
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dc.l $00040004
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dc.l $000300AB
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dc.l $000100BC
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dc.l $00200020
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dc.l $0020008B
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dc.l $00000000
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align 10 ; fill up the boot blocks
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0
BootstrapFloppy/Finder
Normal file
0
BootstrapFloppy/Finder
Normal file
1
BootstrapFloppy/Finder.idump
Normal file
1
BootstrapFloppy/Finder.idump
Normal file
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FNDRMACS
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0
BootstrapFloppy/System
Normal file
0
BootstrapFloppy/System
Normal file
1
BootstrapFloppy/System.idump
Normal file
1
BootstrapFloppy/System.idump
Normal file
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ZSYSMACS
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14
Makefile
14
Makefile
@ -19,3 +19,17 @@ image: systools607.dsk.a Makefile
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systools607.dsk.a: systools607.dsk
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python3 -c 'for b in open("systools607.dsk","rb").read(): print(" dc.b $$%02X" % b)' >systools607.dsk.a
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Bootstrap.bin: Bootstrap.a
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vasm-1/vasmm68k_mot -quiet -Fbin -pic -o $@ $<
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BootstrapFloppy/System.rdump: Bootstrap.bin
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rfx cp $< $@//boot/1
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BootstrapFloppy.dsk: BootstrapFloppy/System.rdump
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MakeHFS -n 'NetBoot Enabler' -i BootstrapFloppy -s 1440k -d now $@
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testflop: BootstrapFloppy.dsk
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Mini\ vMac\ Classic.app/Co*/Ma*/* xo.rom $<
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@ -2,4 +2,6 @@
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trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT
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./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
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make BootstrapFloppy.dsk
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./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):
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with open(sys.argv[1], 'r+b') as f:
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# Skip the initial PRAM check in forXO.a:InstallNetBoot
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f.seek(0x1d928)
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while f.tell() < 0x1D982:
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f.write(b'Nq') # nop
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# Find a safe place to store our overridden NetBoot config struct
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# (Which would otherwise be cobbled from various parts of PRAM)
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garbage_location = 0x67046 # The MacsBug copyright string in the ROM Disk
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# Make out own structure, as adapted from NetBoot.h
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the_netboot_structure = struct.pack('>BBBB BB 16s 32s 8s H', # Note that "int"s are 4 bytes, somehow!
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# First 4 bytes at PRAM+4
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1, # char osType; /* preferred os to boot from */
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1, # char protocol; /* preferred protocol to boot from */
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0, # char errors; /* last error in network booting */
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0x80, # char flags; /* flags for: never net boot, boot first, etc. */
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# Now, the AppleTalk-protocol-specific part
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0, # unsigned char nbpVars; /* address of last server that we booted off of */
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0, # unsigned char timeout; /* seconds to wait for bootserver response */
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b'PWD PWD PWD PWD ', # unsigned int signature[4]; /* image signature */ Elliot notes: zeroes match anything!
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b'Elliot', # char userName[31]; /* an array of char, no length byte */
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b'volapuk', # char password[8]; /* '' */
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0xBABE, # short serverNum; /* the server number */
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).ljust(72, b'\0')
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# the_netboot_structure = bytearray(the_netboot_structure)
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# for i, j in enumerate(range(54, len(the_netboot_structure))):
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# the_netboot_structure[j] = i
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# This is the guts of the NetBoot ReadPRAM procedure
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f.seek(0x1DF08)
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write_asm(f, f'''
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move.l a0,a1
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move.l 0x2ae,a0 ; RomBase
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add.l #{hex(garbage_location)},a0
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move.l #{hex(len(the_netboot_structure))},d0
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.2byte 0xA02E ; BlockMove
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rts
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''')
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f.seek(garbage_location)
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f.write(the_netboot_structure)
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# I have implemented Snefru, so this is no longer needed:
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# Do the dodgy... cancel signature validation!
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# f.seek(0x21A84)
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