27 lines
1.2 KiB
INI
27 lines
1.2 KiB
INI
|
# RX4E4Z - Casper's Scare School: Spooky Sports Day
|
||
|
|
|
||
|
|
[OnFrame]
|
||
|
|
# Work around a dcache issue by preventing the game from doing something pointless.
|
||
|
|
#
|
||
|
|
# The game's DVD read function writes 0x87654321 to the entire read buffer and 0x12345678 to the
|
||
|
|
# last 4 bytes. It then calls DVDReadAsync() and without waiting for the read to complete at all,
|
||
|
|
# it checks if the last 4 bytes are still 0x12345678. If they are, then the game fails.
|
||
|
|
#
|
||
|
|
# The check always passes on console because DVDReadAsync() -> issueCommand() calls
|
||
|
|
# DCInvalidateRange() (dcbi) on the read buffer.
|
||
|
|
#
|
||
|
|
# Dolphin cannot emulate this without an extremely significant performance hit.
|
||
|
|
#
|
||
|
|
# .text:800D2E64 lis r7, game_dvd_read_callback@ha
|
||
|
|
# .text:800D2E68 stw r0, 0(r17) # write 0x12345678 to the end of the buffer
|
||
|
|
# .text:800D2E6C mr r5, read_length # length
|
||
|
|
# .text:800D2E70 mr r6, read_offset # offset
|
||
|
|
# .text:800D2E74 addi r3, this, file.file_info # file_info
|
||
|
|
# .text:800D2E78 subi r4, r4, dvd_read_buf@l # addr
|
||
|
|
# .text:800D2E7C addi r7, r7, game_dvd_read_callback@l # callback
|
||
|
|
# .text:800D2E80 li r8, 2 # unknown
|
||
|
|
# .text:800D2E84 bl DVDReadAsync
|
||
|
|
#
|
||
|
|
$Fix file reads (dcache bypass)
|
||
|
|
0x800d2e68:dword:0x60000000
|