Martin Michelsen
40 lines
1.2 KiB
ArmAsm
40 lines
1.2 KiB
ArmAsm
# This function returns the game version, with values more specific than can be
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# detected by the sub_version field in the various login commands (e.g. 9D/9E).
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# The returned value has the format SSGGRRVV, where:
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# S = 33 (which represents PSO GC)
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# G = game (4F (O) = Ep1&2, 53 (S) = Ep3)
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# R = region (45 (E), 4A (J), or 50 (P))
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# V = minor version | 30 (30 = 1.0, 31 = 1.1, 32 = 1.2, etc.), or 54 for NTE
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# This results in a 4-character ASCII-printable version code which encodes all
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# of the above information. This value is called specific_version in the places
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# where it's used by the server.
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entry_ptr:
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reloc0:
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.offsetof start
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start:
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lis r3, 0x8000
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lwz r4, [r3]
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# For Trial Editions, set the V field to 54; for other versions, set it to
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# 0x30 | disc_version
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rlwinm r0, r4, 8, 24, 31
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cmplwi r0, 0x47 # Check if high byte of game ID is 'G'
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beq not_trial
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cmplwi r0, 0x44 # Check if high byte of game ID is 'D'
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beq is_nte
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li r3, 0
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blr
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is_nte:
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li r3, 0x0054
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b end_trial_check
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not_trial:
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lbz r3, [r3 + 7]
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ori r3, r3, 0x0030
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end_trial_check:
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oris r3, r3, 0x3300 # Set high byte ('3')
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rlwimi r3, r4, 8, 8, 23 # Set middle two bytes to last two bytes of game ID
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blr
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