Restrictions for the calling environment

Table 1. Restrictions while calling the character conversion services
Property	Restriction
Authorization	Problem state or supervisor state, and any PSW key
Dispatchable unit mode	Task or SRB
Cross memory mode	Any PASN, any HASN, any SASN
AMODE	31-bit and 64-bit
ASC mode	Called in primary mode but exploiting AR mode
Interrupt status	Enabled for I/O and external interrupts
Locks	May be held by the caller, but is not required to hold any
Control parameters	Must be in the primary address space
Recovery environment	Provided exclusively by the caller of the conversion services