The ES (ETicket Services) is responsible for the security of Wii, making it the enemy! Along with the rest of IOS, this is generally considered a "private interface" -- game developers never call any of these functions directly. Most of these are now implemented in libogc -- see http://devkitpro.svn.sourceforge.net/viewvc/devkitpro/trunk/libogc/libogc/es.c?view=log. Please feel free to submit patches to implement the remaining functions.
Here are the known ES functions:
ios_ioctlv( fd, 0x01, 4, 0, vec); // ES_AddTicket(const signed_blob *stik, u32 stik_size, const signed_blob *certificates, u32 certificates_size, const signed_blob *crl, u32 crl_size)
ios_ioctlv( fd, 0x02, 4, 0, vec); // ES_AddTitleStart(const signed_blob *stmd, u32 tmd_size, const signed_blob *certificates, u32 certificates_size, const signed_blob *crl, u32 crl_size)
ios_ioctlv( fd, 0x03, 2, 0, vec); // ES_AddContentStart(u64 titleID, u32 cid)
ios_ioctlv( fd, 0x04, 2, 0, vec); // ES_AddContentData(s32 cfd, u8 *data, u32 data_size)
ios_ioctlv( fd, 0x05, 1, 0, vec); // ES_AddContentFinish(u32 cid)
ios_ioctlv( fd, 0x06, 0, 0, vec); // ES_AddTitleFinish(void)
ios_ioctlv( fd, 0x07, 0, 1, vec); // ES_GetDeviceID
ios_ioctlvReboot(fd, 8, 2, 0, vec); // ES_LaunchTitle(u64 titleID, const tikview *view)
ios_ioctlv( fd, 0x09, 1, 0, vec); // ES_OpenContent(u16 index)
ios_ioctlv( fd, 0x0A, 1, 1, vec); // ES_ReadContent(s32 cfd, u8 *data, u32 data_size)
ios_ioctlv( fd, 0x0B, 1, 0, vec); // ES_CloseContent(s32 cfd)
ios_ioctlv( fd, 0x0C, 0, 1, vec); // ES_GetOwnedTitlesCount
ios_ioctlv( fd, 0x0D, 1, 1, vec); // ES_GetOwnedTitles
ios_ioctlv( fd, 0x0E, 0, 1, vec); // ES_GetTitlesCount
ios_ioctlv( fd, 0x0F, 1, 1, vec); // ES_GetTitles
ios_ioctlv( fd, 0x10, 0, 1, vec); // ES_GetTitleContentsCount
ios_ioctlv( fd, 0x11, 2, 1, vec); // ES_GetTitleContent
ios_ioctlv( fd, 0x12, 1, 1, vec); // ES_GetNumTicketViews(u64 titleID, u32 *cnt)
ios_ioctlv( fd, 0x13, 1, 1, vec); // ES_GetTicketViews(u64 titleID, tikview *views, u32 cnt)
ios_ioctlv( fd, 0x14, 1, 1, vec); // ES_GetTmdViewSize
ios_ioctlv( fd, 0x15, 2, 1, vec); // ES_GetTmdView
ios_ioctlv( fd, 0x16, 1, 2, vec); // ES_GetConsumption
ios_ioctlv( fd, 0x17, 1, 2, vec); // ES_DeleteTitle
ios_ioctlv( fd, 0x18, 1, 2, vec); // ES_DeleteTicket
ios_ioctlv( fd, 0x19, 1, 1, vec); // ES_DIGetTmdViewSize( u8 *TMD, u32 *TMDViewSize )
ios_ioctlv( fd, 0x1A, 2, 1, vec); // ES_DiGetTmdView
ios_ioctlv( fd, 0x1B, 1, 1, vec); // ES_DiGetTicketView
ios_ioctlv( fd, 0x1c, 1, 1, vec); // ES_DiVerify
ios_ioctlv( fd, 0x1d, 1, 1, vec); // ES_GetDataDir
ios_ioctlv( fd, 0x1e, 0, 1, vec); // ES_GetDeviceCert(u8 *outbuf)
ios_ioctlv( fd, 0x1f, 6, 0, vec); // ES_ImportBoot( const signed_blob *tik, u32 tik_size, const signed_blob *tik_certs, u32 tik_certs_size, const signed_blob *tmd, u32 tmd_size, const signed_blob *tmd_certs, u32 tmd_certs_size, const u8 *content, u32 content_size )
ios_ioctlv( fd, 0x20, 0, 1, vec); // ES_GetTitleId
ios_ioctlv( fd, 0x21, 1, 0, vec); // ES_SetUid
ios_ioctlv( fd, 0x22, 1, 0, vec); // ES_DeleteTitleContent(u64 titleID) - deletes all files containing 'app' in a /title/xxxxxxxx/yyyyyyyy/content
ios_ioctlv( fd, 0x23, 3, 0, vec); // ES_SeekContent
ios_ioctlv( fd, 0x24, 3, 0, vec); // ES_OpenTitleContent(u64 titleID, const tikview *view, u16 index)
ios_ioctlv( fd, 0x25, 0, 0, vec); // ES_LaunchBC(void)
ios_ioctlv( fd, 0x26, 1, 1, vec); // ES_ExportTitleInit
ios_ioctlv( fd, 0x27, 2, 0, vec); // ES_ExportContentBegin
ios_ioctlv( fd, 0x28, 1, 1, vec); // ES_ExportContentData
ios_ioctlv( fd, 0x29, 1, 0, vec); // ES_ExportContentEnd
ios_ioctlv( fd, 0x2A, 0, 0, vec); // ES_ExportTitleDone(void)
ios_ioctlv( fd, 0x2B, 1, 0, vec); // ES_AddTmd
ios_ioctlv( fd, 0x2C, 3, 2, vec); // ES_Encrypt(u32 keynum, u8 *iv, u8 *source, u32 size, u8 *dest)
ios_ioctlv( fd, 0x2D, 3, 2, vec); // ES_Decrypt(u32 keynum, u8 *iv, u8 *source, u32 size, u8 *dest)
ios_ioctlv( fd, 0x2E, 0, 1, vec); // ES_GetBoot2Version(u32 *version)
ios_ioctlv( fd, 0x2F, 0, 0, vec); // ES_AddTitleCancel(void)
ios_ioctlv( fd, 0x30, 1, 2, vec); // ES_Sign(u8 *source, u32 size, u8 *sig, u8 *certs)
ios_ioctlv( fd, 0x31, 3, 0, vec); // ES_VerifySign
// the following functions are only available in IOS28+
ios_ioctlv( fd, 0x32, 0, 1, vec); // ES_GetStoredContentCount
ios_ioctlv( fd, 0x33, 0, 1, vec); // ES_GetStoredContent
ios_ioctlv( fd, 0x34, 0, 1, vec); // ES_GetStoredTmdSize
ios_ioctlv( fd, 0x35, 0, 1, vec); // ES_GetStoredTmd
ios_ioctlv( fd, 0x36, 0, 1, vec); // ES_GetSharedContentCount
ios_ioctlv( fd, 0x37, 0, 1, vec); // ES_GetSharedContents
ios_ioctlv( fd, 0x38, ?, ?, vec);
ios_ioctlv( fd, 0x39, 0, 1, vec); // ES_GetDiTmdSize
ios_ioctlv( fd, 0x3A, 1, 1, vec); // ES_GetDiTmd
ios_ioctlv( fd, 0x3B, 0, 1, vec); // Unknown ... calls ES_DiVerify
ios_ioctlv( fd, 0x3C, 0, 1, vec); // Unknown ... calls ES_DiVerify
ios_ioctlv( fd, 0x3D, 0, 1, vec); // wrapper for syscall 5c