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Add section about hai params
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=== SDI ===
=== SDI ===
This modified SDI module adds '''/dev/sdio/MLC01''' to allow reading and writing to the MLC, which is used by DI2SD.
This modified SDI module adds '''/dev/sdio/MLC01''' to allow reading and writing to the MLC, which is used by DI2SD.
+
+== Hai params ==
+The Wii U mode passes some parameters to this IOS which are referred to as "HaiParam" or "Hai params" (see [[cafe2wii#HAI|HAI mode]]).
+
+=== Format ===
+These parameters are stored in memory at 0xfffff000 and their format is described below.
+
+==== Header ====
+{| class="wikitable"
+|-
+! Start
+! Length
+! Description
+|-
+| 0x00
+| 4
+| Magic value: "Hai" (0x48616900)
+|-
+| 0x04
+| 2
+| Total size of the parameters (including header) in bytes
+|-
+| 0x06
+| 2
+| Parameter count
+|}
+The parameters follow after the header.
+
+==== Parameter ====
+{| class="wikitable"
+|-
+! Start
+! Length
+! Description
+|-
+| 0x00
+| 2
+| ID (see table below)
+|-
+| 0x02
+| 2
+| Size of parameter data in bytes
+|}
+The parameter data follows after the structure described above.
+
+==== Parameter IDs ====
+{| class="wikitable"
+|-
+! Key
+! Description
+|-
+| 0x0
+| Ticket of the title to boot
+|-
+| 0x1
+| TMD of the title to boot
+|-
+| 0x100
+| This is a string in the following format: <code>target:/path</code>.<br>Where target is either <code>mlc</code>, <code>usb</code>, <code>ahci</code> or <code>file</code> and path is the path to the imginf.bin file containing offsets to the nfs files (usually <code>/shared2/sys/hai/imginf.bin</code> on the slccmpt).
+|-
+| 0x101
+| Unknown (0x10 bytes)
+|-
+| 0x200
+| Unknown (4 byte integer which is either 0 or 1)
+|-
+| 0x201
+| Unknown (4 byte integer)
+|-
+| 0x300
+| Unknown (1 byte which is always set to 1 by the IOSU)
+|}
+
+=== Syscall 7A ===
+To retrieve these parameters HAI-IOS has an additional syscall in the following format: <code>IOSError syscall_7a(u16 id, void *data, u32 *size)</code>.