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=== Syscall 7A ===
=== 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>.
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>.
+
+== Companion File ==
+The Companion file usually /shared2/sys/hai/imginf.bin on the slccmpt contains the information about the extends of the nfs files.
+
+=== Format ===
+The companion file starts with a 8 byte header, followed by a variable number of extends and ends with a 1 byte footer
+==== Header ====
+The companion file starts with a 8 byte header
+{| class="wikitable"
+|-
+! Start
+! Length
+! Description
+! Example
+|-
+| 0x00
+| 4
+| Number of extends
+| 1
+|-
+| 0x04
+| 2
+| Address Base Unit
+| 13
+|-
+| 0x06
+| 2
+| Seems to be ignored by HAI-IOS, but had same value as the Address Base Unit
+| 13
+|}
+
+==== Extends ====
+The header is followed by the Array of Extends
+The format of one extend is:
+{| class="wikitable"
+|-
+! Start
+! Length
+! Description
+! Example
+|-
+| 0x00
+| 4
+| Start Address
+| 0x0000a575
+|-
+| 0x04
+| 4
+| Length
+| 0x00000684
+|}
+
+==== Footer ====
+The extends are followed by one byte with varying values, which is also ignored by HAI-IOS