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/* $Id: itlb_miss.S,v 1.10 1997/03/26 12:24:18 davem Exp $
* itlb_miss.S: Instruction TLB miss code, this is included directly
* into the trap table.
*
* Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
/* Gratuitous comment. */
/* ICACHE line 1 */
/*0x00*/ ldxa [%g0] ASI_IMMU, %g1 ! Get TAG_TARGET
/*0x04*/ srlx %g1, 8, %g3 ! Position PGD offset
/*0x08*/ srlx %g1, 48, %g5 ! Shift down CONTEXT bits
/*0x0c*/ and %g3, %g2, %g3 ! Mask PGD offset
/*0x10*/ sllx %g1, 2, %g4 ! Position PMD offset
/*0x14*/ ldxa [%g0] ASI_IMMU_TSB_8KB_PTR, %g1 ! For PTE offset
/*0x18*/ brz,pn %g5, 3f ! Context 0 == kernel
/*0x1c*/ and %g4, %g2, %g4 ! Mask PMD offset
/* ICACHE line 2 */
/*0x20*/ ldxa [%g7 + %g3] ASI_PHYS_USE_EC, %g5 ! Load user PGD
/*0x24*/ srlx %g1, 1, %g1 ! PTE offset
/*0x28*/ ldxa [%g5 + %g4] ASI_PHYS_USE_EC, %g3 ! Load PMD
2:/*0x2c*/ ldxa [%g3 + %g1] ASI_PHYS_USE_EC, %g5 ! Load PTE
/*0x30*/ brlz,a,pt %g5, 1f ! Valid set?
/*0x34*/ stxa %g5, [%g0] ASI_ITLB_DATA_IN ! TLB load
/*0x38*/ ba,a,pt %xcc, sparc64_itlb_refbit_catch ! Nope...
1:/*0x3c*/ retry ! Trap return
3: /* ICACHE line 3 */
/*0x40*/ ldxa [%g6 + %g3] ASI_PHYS_USE_EC, %g5 ! Load kern PGD
/*0x44*/ srlx %g1, 1, %g1 ! PTE offset
/*0x48*/ ba,pt %xcc, 2b ! Continue above
/*0x4c*/ ldxa [%g5 + %g4] ASI_PHYS_USE_EC, %g3 ! Load PMD
/*0x50*/ nop
/*0x54*/ nop
/*0x58*/ nop
/*0x5c*/ nop
/* ICACHE line 4 */
/*0x60*/ nop
/*0x64*/ nop
/*0x68*/ nop
/*0x6c*/ nop
/*0x70*/ nop
/*0x74*/ nop
/*0x78*/ nop
/*0x7c*/ nop
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