After MMU is on, 0x18 is virtual.
That's how linux handle exceptions.  It puts all the vectors starting from 0xc0000000 and map 0xc0000000 to zero.
----- Original Message -----
From: wang hz
Sent: Tuesday, June 05, 2001 12:59 AM
Subject: mmu problem

hi:
I have a confusion about mmu.
when I set the virtual zero address on physics no zero address.
then when a exception occur, for example , a IRQ , will force PC to
 0x18 . my question is "0x18" is a virtual address or physics  address. 
      thanks.

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