303
edits
Changes
0x85 is DVDLowMaskCoverInterrupt, while 0x89 is DVDLowUnmaskCoverInterrupt (I had them swapped). 0x87 is almost certainly DVDLowUnmaskStatusInterrupts.
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+
+
+Enables the cover interrupt by setting bit 1 of DICVR (leaving bit zero unchanged). Does not clear the cover interrupt if it is currently asserted (does not write bit 2).+
<li>0x83 DVDLowGetLength</li>
<li>0x83 DVDLowGetLength</li>
<li>0x84 Get DIIMMBUF</li>
<li>0x84 Get DIIMMBUF</li>
−<li>0x85 DVDLowUnmaskCoverInterrupt</li>
+<li>0x85 DVDLowMaskCoverInterrupt</li>
<li>0x86 DVDLowClearCoverInterrupt</li>
<li>0x86 DVDLowClearCoverInterrupt</li>
−<li>0x87</li>
+<li>0x87 DVDLowUnmaskStatusInterrupts</li>
<li>0x88 DVDLowGetCoverStatus</li>
<li>0x88 DVDLowGetCoverStatus</li>
−<li>0x89 Enable Cover Interrupt</li>
+<li>0x89 DVDLowUnmaskCoverInterrupt</li>
<li>0x8B DVDLowOpenPartition ioctl</li>
<li>0x8B DVDLowOpenPartition ioctl</li>
<li>0x8E DVDLowEnableDvdVideo</li>
<li>0x8E DVDLowEnableDvdVideo</li>
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−=== 0x85 DVDLowUnmaskCoverInterrupt ===
+=== 0x85 DVDLowMaskCoverInterrupt ===
−Disables the cover interrupt by clearing bit 1 of DICVR (leaving bit zero unchanged). Does not clear the cover interrupt if it is currently asserted (does not write bit 2).
+Disables the cover interrupt by clearing bit 1 of DICVR (leaving bit zero unchanged). Does not clear the cover interrupt if it is currently asserted (does not write bit 2). Actual code is <code>DICVR = (DICVR & ~4 & ~2)</code>.
+Titles have a DVDLowMaskCoverInterrupt function that is dummied out to always return 1; this function is used by DVDInit in the exact same place that gamecube titles write <code>DICVR = 0</code> (which should be equivalent, as writes to bit 0 which indicates the cover status presumably do nothing{{check}}). However, since it is stubbed out, there is no way of being sure that 0x85 was actually used by that function.
The output buffer is not used, and it may be null. Its size is not checked.
The output buffer is not used, and it may be null. Its size is not checked.
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−=== <s>0x87</s> ===
+=== <s>0x87 DVDLowUnmaskStatusInterrupts</s> ===
−Dummied out; does nothing (and always returns 1). Possibly an ID reserved for a PPC-only command (DVDLowBreak?), as is also done with DVDLowSetSpinupFlag?
+Dummied out; does nothing (and always returns 1).
+Titles have a DVDLowUnmaskStatusInterrupts function that is dummied out to always return 1; this function is used by DVDInit in the exact same place that gamecube titles write <code>DISR = 0x2a</code> (which enables DEINTMASK, TCINTMASK, and BRKINTMASK, and does not clear any asserted interrupts). However, since it is stubbed out, there is no way of being sure that 0x87 was actually used by that function.
The output buffer is not used, and it may be null. Its size is not checked.
The output buffer is not used, and it may be null. Its size is not checked.
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−=== 0x89 Enable Cover Interrupt ===
+=== 0x89 DVDLowUnmaskCoverInterrupt ===
+Enables the cover interrupt by setting bit 1 of DICVR (leaving bit zero unchanged). Does not clear the cover interrupt if it is currently asserted (does not write bit 2). Actual code is <code>DICVR = ((DICVR & ~4) | 2)</code>.
−Debug symbols list a function called DVDLowUnmaskCoverInterrupt, but no actual function remains as it was removed as unused (and even if it did still exist, it presumably would be dummied out to just return 1 as it is only 8 bytes). Therefore, there is no way to be certain that 0x89 actually was called DVDLowUnmaskCoverInterrupt, but it seems very likely based on DVDLowMaskCoverInterrupt.
The output buffer is not used, and it may be null. Its size is not checked.
The output buffer is not used, and it may be null. Its size is not checked.