* ========== Copyright Header Begin ==========================================
* OpenSPARC T2 Processor File: daccess_except_handler.s
* Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
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* ========== Copyright Header End ============================================
ldxa [%g7] 0x58, %g2 ! get sfsr
ldxa [%g7] 0x58, %g3 ! get sfar
ldxa [%g0] 0x59, %g1 ! dmmu ps0 ptr
ldda [%g1] 0x24, %g4 ! load tte from ps0 tsb
cmp %g4, -1 ! if all 1's, follow link
be,a %xcc, dacc_ex_ptr_chase
mov 0, %g7 ! remember ptr chase from ps0
srlx %g5, 63, %g3 ! if not valid, check ps1
sllx %g5, 15, %g3 ! extract size[2]
sllx %g5, 1, %g1 ! extract size[1:0]
or %g3, %g1, %g1 ! %g1 = size[2:0]
srlx %g1, 61, %g1 ! %g1 = size[2:0]
sethi %hi(0x00001fff), %g1
or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0]
and %g2, %g3, %g3 ! apply mask
cmp %g3, %g4 ! check if va/ctxt match
be %xcc, dacc_ex_trap_done
ldxa [%g0] 0x5a, %g1 ! dmmu ps1 ptr
ldda [%g1] 0x24, %g4 ! load tte from ps1 tsb
cmp %g4, -1 ! if all 1's, follow link
be,a %xcc, dacc_ex_ptr_chase
mov 1, %g7 ! remember ptr chase from ps1
srlx %g5, 63, %g3 ! if not valid, bad_trap
sllx %g5, 15, %g3 ! extract size[2]
sllx %g5, 1, %g1 ! extract size[1:0]
or %g3, %g1, %g1 ! %g1 = size[2:0]
srlx %g1, 61, %g1 ! %g1 = size[2:0]
sethi %hi(0x00001fff), %g1
or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0]
and %g2, %g3, %g3 ! apply mask
cmp %g3, %g4 ! check if va/ctxt match
be %xcc, dacc_ex_trap_done
or %g5, %g0, %g6 ! %g6 is link-reg
ldda [%g6] 0x24, %g4 ! load tte from tsb
sllx %g5, 15, %g3 ! extract size[2]
sllx %g5, 1, %g1 ! extract size[1:0]
or %g3, %g1, %g1 ! %g1 = size[2:0]
srlx %g1, 61, %g1 ! %g1 = size[2:0]
sethi %hi(0x00001fff), %g1
or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0]
and %g2, %g3, %g3 ! apply mask
cmp %g3, %g4 ! check if va/ctxt match
be %xcc, dacc_ex_trap_done
bne %xcc, dacc_ex_ptr_chase_loop ! keep chasing pointer
brz %g7, dacc_ex_ps1 ! finished ps0 pointer chasing, go to ps1
ta T_BAD_TRAP ! finished ps1 pointer chasing, go to bad_trap
! add partition base to data-in
setx partition_base_list, %g1, %g2 ! for partition base
mov 0x80, %g1 ! offset (VA) for patrition id
ldxa [%g1] 0x58, %g3 ! partition id
sllx %g3, 3, %g3 ! offset - partition list
mov 0x4, %g1 ! clear P-bit
stxa %g4, [ %g7 ] 0x58 ! {tag-access, data-in}