interrupt priority level
英[ˌɪntəˈrʌpt praiˈɔriti ˈlevl]美[ˌɪntəˈrʌpt praɪˈɔrɪti ˈlɛvəl]
The interrupt priority level (IPL) is a part of the current system interrupt state, which indicates the interrupt requests that will currently be accepted. The IPL may be indicated in hardware by the registers in a Programmable Interrupt Controller, or in software by a bitmask or integer value.