fix(aia): external interrupt priority from PLIC or IMSIC #785
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* The current external interrupts come from two sources, CLINT and IMSIC. The external interrupt priority number of CLINT is 0, and the external interrupt priority number of IMSIC is 1~2047. We use the global variable external_interrupt_select to determine the source of the external interrupt. If the external interrupt comes from CLINT, external_interrupt_select = false; if the external interrupt comes from IMSIC, external_interrupt_select = true. * The case where the priority number is greater than 255 is added to the interrupt priority comparison method. * The priority number of each interrupt in the iprios array occupies 8 bits, and its read data is masked by the corresponding bit of the xie register, so when writing the xie register, the read data of the iprios array needs to be updated.
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The current external interrupts come from two sources,
PLICandIMSIC.The external interrupt priority number of PLIC is
0, and the external interrupt priority number of IMSIC is1~2047.We use the global variable
external_interrupt_selectto determine the source of the external interrupt.If the external interrupt comes from PLIC,
external_interrupt_select= false;if the external interrupt comes from IMSIC,
external_interrupt_select= true.The case where the priority number is greater than
255is added to the interrupt priority comparison method.The priority number of each interrupt in the
iprios arrayoccupies8bits, and its read data is masked by the corresponding bit of thexieregister, so when writing thexieregister, theread dataof theiprios arrayneeds to be updated.