root/arch/sparc/kernel/ivec.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2         /* The registers for cross calls will be:
   3          *
   4          * DATA 0: [low 32-bits]  Address of function to call, jmp to this
   5          *         [high 32-bits] MMU Context Argument 0, place in %g5
   6          * DATA 1: Address Argument 1, place in %g1
   7          * DATA 2: Address Argument 2, place in %g7
   8          *
   9          * With this method we can do most of the cross-call tlb/cache
  10          * flushing very quickly.
  11          */
  12         .align          32
  13         .globl          do_ivec
  14         .type           do_ivec,#function
  15 do_ivec:
  16         mov             0x40, %g3
  17         ldxa            [%g3 + %g0] ASI_INTR_R, %g3
  18         sethi           %hi(KERNBASE), %g4
  19         cmp             %g3, %g4
  20         bgeu,pn         %xcc, do_ivec_xcall
  21          srlx           %g3, 32, %g5
  22         stxa            %g0, [%g0] ASI_INTR_RECEIVE
  23         membar          #Sync
  24 
  25         sethi           %hi(ivector_table_pa), %g2
  26         ldx             [%g2 + %lo(ivector_table_pa)], %g2
  27         sllx            %g3, 4, %g3
  28         add             %g2, %g3, %g3
  29 
  30         TRAP_LOAD_IRQ_WORK_PA(%g6, %g1)
  31 
  32         ldx             [%g6], %g5
  33         stxa            %g5, [%g3] ASI_PHYS_USE_EC
  34         stx             %g3, [%g6]
  35         wr              %g0, 1 << PIL_DEVICE_IRQ, %set_softint
  36         retry
  37 do_ivec_xcall:
  38         mov             0x50, %g1
  39         ldxa            [%g1 + %g0] ASI_INTR_R, %g1
  40         srl             %g3, 0, %g3
  41 
  42         mov             0x60, %g7
  43         ldxa            [%g7 + %g0] ASI_INTR_R, %g7
  44         stxa            %g0, [%g0] ASI_INTR_RECEIVE
  45         membar          #Sync
  46         ba,pt           %xcc, 1f
  47          nop
  48 
  49         .align          32
  50 1:      jmpl            %g3, %g0
  51          nop
  52         .size           do_ivec,.-do_ivec