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FSAddClientEx: Invoke SD card attach callback, so that Mii Maker knows it's present.

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This commit is contained in:
Arian Kordi 2026-07-09 00:32:17 -04:00
parent 1e1b2c14c5
commit fa884c8684
1 changed files with 41 additions and 5 deletions
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46
src/Cafe/OS/libs/coreinit/coreinit_FS.cpp
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@ -275,7 +275,37 @@ namespace coreinit
cemuLog_log(LogType::Force, "FSShutdown called");
}
FS_RESULT FSAddClientEx(FSClient_t* fsClient, uint32 uknR4, uint32 errHandling)
/// Buffer for the notification passed to the FSAddClientEx callback.
/// Only the name at 0x18 ("sdcard") is read out of this from Mii Maker.
SysAllocator<uint8, 0x40> s_fsClientNotification;
// NOTE: Size is unknown, just using something generous.
/// Notifies the guest that the SD card is present when they
/// register a callback via FSAddClientEx's r4 parameter.
static void __FSInvokeNotificationSDCard(MPTR notifyParamMPTR)
{
constexpr uint32 nameOffset = 0x1c;
// The callback should be non-null before reaching this point.
MPTR callbackMPTR = memory_readU32(notifyParamMPTR + 0x00);
cemu_assert_debug(callbackMPTR != MPTR_NULL);
MPTR contextMPTR = memory_readU32(notifyParamMPTR + 0x04); // User object/context pointer.
// Zero-initialize the notification.
uint8* pNotification = s_fsClientNotification.GetPtr();
memset(pNotification, 0, s_fsClientNotification.GetByteSize());
// Copy the string "sdcard" into the notification at 0x18.
// Mii Maker USA v50 compares this at 0202e6a4
char* pMountName = reinterpret_cast<char*>(pNotification + nameOffset);
strcpy(pMountName, "sdcard");
// Invoke the user's callback. This happens synchronously in the same thread.
PPCCoreCallback(callbackMPTR,
0 /* r3 = Unknown */, 1 /* r4 = Set to 0 if not present */,
s_fsClientNotification.GetMPTR(), contextMPTR);
}
FS_RESULT FSAddClientEx(FSClient_t* fsClient, MPTR notifyParam, uint32 errHandling)
{
if (!sFSInitialized || sFSShutdown || !fsClient)
{
@ -283,13 +313,13 @@ namespace coreinit
return FS_RESULT::FATAL_ERROR;
}
FSLockMutex();
if (uknR4 != 0)
if (notifyParam != MPTR_NULL)
{
uint32 uknValue = memory_readU32(uknR4 + 0x00);
if (uknValue == 0)
MPTR callbackMPTR = memory_readU32(notifyParam + 0x00);
if (callbackMPTR == MPTR_NULL)
{
FSUnlockMutex();
__FSErrorAndBlock("FSAddClientEx - unknown error");
__FSErrorAndBlock("FSAddClientEx: Notification parameter was passed, but the inner callback is null.");
return FS_RESULT::FATAL_ERROR;
}
}
@ -324,6 +354,12 @@ namespace coreinit
fsClientBody->fsClientBodyNext = nullptr;
}
FSUnlockMutex();
// Emulate a notification that the SD card (always mounted) was
// attached, if the title (e.g. Mii Maker) specified a callback.
if (notifyParam != MPTR_NULL)
__FSInvokeNotificationSDCard(notifyParam);
return FS_RESULT::SUCCESS;
}