SceMsif

Certainly means Memory stick interface.

sceMsifSwResetForDriver
Temp name was sceMsifInitializeMmcDeviceForDriver.

Part of functionality is same as msif_get_sha224_digest_source.

msif_get_time_from_SceMsifSmshc
Returns wide time difference from last SceMsifSmshc interrupt.

sceMsifZerofillSectorForDriver
This is a guessed name. Temp name was sceMsifDevNullPrepareDmaTableForDriver.

Zerofills sectors by DMA-ing from '/dev/null' (physical address 0x1D000000).

sceMsifGetMediaIdForDriver
Gets data that is used to calculate sha224 digest. This digest is used to verify static table of sha224 digests. That is decrypted internally using keys that are derived from sceSblSsMgrDecryptWithPortabilityForDriver.

This function is also used in SceMagicGate.